CN217370496U - Lathe, lathe tailstock and power driving circuit thereof - Google Patents

Abstract

The utility model relates to a lathe, lathe tailstock and power drive circuit thereof. The power driving circuit of the lathe tailstock detects the state signal of the driving module driving the motor of the lathe tailstock to work through the protection module, and outputs the stop signal from the output end of the protection module to control the driving module to stop driving the motor to work under the condition that the state signal is larger than the preset signal, so that the motor is prevented from continuously working under the condition that the state signal is larger than the preset signal, and the reliability of the power driving circuit is improved. Meanwhile, the protection module is directly connected with the control end of the driving module, so that the protection module does not need to pass through the control module, and the protection action speed is increased.

Description

Lathe, lathe tailstock and power driving circuit thereof

Technical Field

The utility model relates to a lathe control technology field especially relates to a lathe, lathe tailstock and power drive circuit thereof.

Background

In the field of mechanical production, a lathe is generally used for machining shaft-like workpieces. In order to meet the requirements of concentricity of a workpiece or drilling at the end part of the workpiece in the machining process, a tailstock with a tip or a drill bit is placed on a lathe guide rail. At present, the reliability of a circuit for driving a tailstock to process shaft workpieces is low, and potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need for a highly reliable lathe, lathe tailstock, and power driver circuit therefor.

In a first aspect, a power driving circuit of a lathe tailstock is provided, where the lathe tailstock includes a tip mechanism and a motor for driving the tip mechanism to process a workpiece, and the power driving circuit includes: the input end of the driving module is connected with a power supply, and the output end of the driving module is connected with the motor; the output end of the control module is connected with the control end of the driving module and used for outputting a control signal; the control signal is used for controlling the driving module to drive the motor to work; the output end of the protection module is connected with the control end of the driving module and used for detecting a state signal of the driving module and outputting a stop signal from the output end of the protection module to control the driving module to stop driving the motor to work under the condition that the state signal is greater than a preset signal; the state signal is used for reflecting the working state of the driving module.

In one embodiment, the status signal includes an actual current at an output of the driving module, the preset signal includes a preset current signal, and the protection module includes: the input end of the current detection unit is connected with the output end of the driving module, and the current detection unit is used for detecting the actual current and outputting a corresponding current detection signal from the output end of the current detection unit; the first end of the first comparison unit is connected with the output end of the current detection unit, and the second end of the first comparison unit is used for accessing the preset current signal; the input end of the first logic processing unit is connected with the output end of the first comparison unit, the output end of the first logic processing unit is connected with the control end of the driving module, the first logic processing unit is used for outputting the stop signal from the output end of the logic processing unit under the condition that a first early warning signal is received, and the first early warning signal is used for representing that the current detection signal is larger than the preset current signal.

In one embodiment, the status signal includes an actual temperature of the driving module, the preset signal includes a preset temperature signal, and the protection module includes: the temperature detection unit is used for detecting the actual temperature and outputting a corresponding temperature detection signal from the output end of the temperature detection unit; the first end of the second comparison unit is connected with the output end of the temperature detection unit, and the second end of the second comparison unit is used for accessing the preset temperature signal; and the input end of the second logic processing unit is connected with the output end of the second comparison unit, the output end of the second logic processing unit is connected with the control end of the driving module, and the second logic processing unit is used for outputting a stop signal from the output end of the logic processing unit under the condition of receiving a second early warning signal, and the second early warning signal is used for indicating that the temperature detection signal is greater than the preset temperature signal.

In one embodiment, the output end of the protection module comprises a first output end and a second output end, and the first output end is connected with the control end of the driving module and used for outputting a stop signal; the second output end is connected with the first input end of the control module, the protection module is further used for outputting an alarm signal from the second output end under the condition that the state signal is greater than a preset signal, and the alarm signal is used for indicating that the control module gives an alarm.

In one embodiment, the power driving circuit of the lathe tailstock further comprises: and the output end of the limiting module is connected with the second input end of the control module and is used for detecting whether the tip mechanism reaches a threshold position.

In one embodiment, the power driving circuit of the lathe tailstock further includes: the pressure detection unit is connected with the third input end of the control module and used for detecting the pressure applied to the workpiece by the tip mechanism; and the position detection unit is connected with the fourth input end of the control module and is used for detecting the position of the tip mechanism.

In one embodiment, the lathe tailstock further comprises a transmission mechanism, the transmission mechanism comprises a slide block and a screw rod, the first side of the slide block is connected with the first side of the tip mechanism, the slide block is connected with a lathe guide rail in a sliding manner, one end of the screw rod is mechanically connected with the output shaft of the motor, and the screw rod is further connected with the slide block in a transmission manner; when the motor rotates, the screw rod is driven to drive the sliding block to reciprocate along the guide rail, so that the tip mechanism is driven to be close to or far away from the workpiece; the pressure detection unit comprises a pressure sensor, one end of the pressure sensor is connected with the first side of the sliding block, and the other end of the pressure sensor is connected with the first side of the tip mechanism.

In one embodiment, the power driving circuit of the lathe tailstock further comprises a display touch module connected with the input and output ends of the control module and used for displaying the pressure applied by the tip mechanism to the workpiece and/or the position of the tip mechanism.

In a second aspect, there is provided a lathe tailstock comprising a power driving circuit of the lathe tailstock according to any one of the first aspect.

In a third aspect, there is provided a lathe including a lathe tailstock as described in any one of the second aspects above.

According to the power driving circuit of the lathe tailstock, the protection module is arranged to detect the state signal of the driving module for driving the motor of the lathe tailstock to work, and under the condition that the state signal is larger than the preset signal, the stop signal is output from the output end of the protection module to control the driving module to stop driving the motor to work, so that the motor is prevented from continuously working under the condition that the state signal is larger than the preset signal, and the reliability of the power driving circuit is improved. Meanwhile, the protection module is directly connected with the control end of the driving module, so that the protection module does not need to pass through the control module, and the protection action speed is increased.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a power driving circuit of a lathe tailstock according to a first embodiment;

FIG. 2 is a schematic structural diagram of a protection module according to a second embodiment;

FIG. 3 is a schematic structural diagram of a protection module according to a third embodiment;

FIG. 4 is a schematic structural diagram of a protection module according to a fourth embodiment;

fig. 5 is a schematic structural diagram of a power driving circuit of a lathe tailstock according to a fifth embodiment;

fig. 6 is a schematic structural diagram of a power driving circuit of a lathe tailstock according to a sixth embodiment;

fig. 7 is a schematic structural diagram of a power driving circuit of a lathe tailstock according to a seventh embodiment.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.

It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.

Referring to fig. 1, a power driving circuit of a lathe tailstock according to a first embodiment of the present disclosure is shown, and as shown in fig. 1, the power driving circuit of the lathe tailstock may include a driving module 110, a control module 120, and a protection module 130. It will be appreciated that the lathe tailstock comprises a tip mechanism and a motor 150, the motor 150 being arranged to drive the tip mechanism to machine a workpiece. In one embodiment, the motor 150 may be an ac servo motor and the tip structure may be a sleeve with a tip or bit mounted therein.

The input end of the driving module 110 is used for being connected with the power supply 140, the output end of the driving module 110 is used for being connected with the motor 150 of the lathe tailstock, the output end of the control module 120 is connected with the control end of the driving module 110, and the output end of the protection module 130 is connected with the control end of the driving module 110. Specifically, the output end of the control module 120 is used for outputting a control signal, and the control signal is used for controlling the driving module 110 to drive the motor to work. The protection module 130 is configured to detect a status signal of the driving module 110, and output a stop signal from an output end of the protection module 130 to control the driving module 110 to stop the driving motor when the status signal of the driving module 110 is greater than a preset signal. It should be noted that the status signal is used to reflect the operating status of the driving module 110. The preset signal is used for evaluating whether the current working state of the driving module 110 is safe, and when the state signal of the driving module 110 is greater than the preset signal, it can be considered that the current driving module 110 has a potential safety hazard. The preset signal may be set according to actual parameters of the driving module 110 and the motor 150. Such as: if the temperature of the driving module 110 is greater than the threshold temperature, the driving module 110 may be damaged, and the predetermined signal may be the threshold temperature. In one embodiment, the stop signal output from the output terminal of the protection module 130 is used to control the driving module 110 to stop working, so that the driving module 110 stops the driving motor 150 from working

Referring to fig. 1, in an embodiment, the power driving circuit of the lathe tailstock may further include a rectifying circuit 160. The input end of the rectifying circuit 160 is connected to the power supply 140, the output end of the rectifying circuit 160 is connected to the input end of the driving module 110, and the rectifying circuit 160 is configured to rectify the alternating current into direct current for the driving module 110 to adjust and output to the motor 150, so as to control the motor 150 to work.

Referring to fig. 1, in an embodiment, the driving module 110 may include a driving unit 112 and an IGBT unit 114, an input end of the IGBT unit 114 is used as an input end of the driving module 110, an output end of the IGBT unit 114 is used as an output end of the driving module 110, an input end of the driving unit 112 is connected to an output end of the control module 120, an output end of the driving unit 112 is connected to a control end of the IGBT unit 114, and an input end of the driving unit 112 is used as a control end of the driving module 110. The driving unit 112 is configured to control the on/off of the input terminal and the output terminal of the IGBT unit 114 according to the control signal, so as to convert the direct current output by the rectifying circuit 160 into a target three-phase alternating current, thereby controlling the operation of the motor 150. Alternatively, the IGBT unit 114 is composed of 6 IGBT tubes. In one embodiment, the control module 120 may include a PWM control logic circuit, and the PWM control logic circuit may output a PWM signal with adjustable level width, so as to control the magnitude of the current output by the output terminal of the IGBT unit 114, where the PWM signal is the control signal. Optionally, the control module 120 may include a microcontroller.

In the power driving circuit of the lathe tailstock provided in the above embodiment, the protection module 130 is arranged to detect the state signal of the driving module 110 for driving the motor of the lathe tailstock to work, and when the state signal is greater than the preset signal, the stop signal is output from the output end of the protection module 130 to control the driving module 110 to stop driving the motor to work, so that the motor is prevented from continuing to work when the state signal is greater than the preset signal, and the reliability of the power driving circuit is improved. Meanwhile, since the protection module 130 is directly connected to the control terminal of the driving module 110, and does not need to pass through the control module 120, the protection speed is increased.

According to the embodiment, the protection module detects the state signal of the driving module to prevent the motor from continuously working under the condition that the state signal of the driving module 110 is greater than the preset signal, so that the reliability of the power driving circuit of the lathe tailstock motor is improved. The following embodiments will provide a protection module to achieve the above functions.

Referring to fig. 2, a protection module according to a second embodiment of the present application is shown, in which a state signal includes an actual current at an output terminal of a driving module, and a predetermined signal includes a predetermined current signal. As shown in fig. 2, the protection module may include a current detection unit 202, a first comparison unit 204, and a first logic processing unit 206.

The input end of the current detection unit 202 is connected to the output end of the driving module 110, the output end of the current detection unit 202 is connected to the first end of the first comparison unit 204, the second end of the first comparison unit 204 is used for accessing a preset current signal, the output end of the first comparison unit 204 is connected to the input end of the first logic processing unit 206, and the output end of the first logic processing unit 206 is connected to the control end of the driving module 110. Specifically, the current detection unit 202 is configured to detect an actual current output by the output end of the driving module 110, and output a corresponding current detection signal from the output end of the current detection unit 202. The first comparing unit 204 is configured to output the first warning signal from the output terminal of the first comparing unit 204 when the input signal of the first terminal of the first comparing unit 204 is greater than the input signal of the second terminal. It is understood that the first comparing unit 204 may also be configured to output the first normal signal from the output terminal of the first comparing unit 204 in case that the input signal of the first terminal of the first comparing unit 204 is less than or equal to the input signal of the second terminal of the first comparing unit 204. Optionally, the first normal signal and the first warning signal may be level signals, and the first normal signal and the first warning signal are different level signals. Alternatively, the first normal signal may be one of a low level signal and a high level signal, and the first warning signal may be the other of the low level signal and the high level signal. Alternatively, the current detection unit 202 may include a current sampling circuit. Alternatively, the first logic processing unit 206 may include a CPLD (complex programmable logic device).

With continued reference to fig. 2, in one embodiment, the power driving circuit of the lathe tailstock may further include a signal amplifier 208. The input end of the signal amplifier 208 is connected to the output end of the current detection unit 202, and the output end of the signal amplifier 208 is connected to the input end of the control module 120, and is configured to perform an amplification operation on the current detection signal and transmit the amplified current detection signal to the control module 120. In one embodiment, the control module 120 may further include an AD conversion module, and the AD conversion module may be configured to convert the amplified current detection signal into a current detection digital signal.

Please refer to fig. 3, which illustrates another protection module according to a third embodiment of the present application. The protection module is configured to detect an actual temperature of the driving module 110, that is, compared to the above embodiment, the status signal includes the actual temperature of the driving module 110, and the preset signal includes a preset temperature signal. As shown in fig. 3, the protection module may include a temperature detection unit 302, a second comparison unit 304, and a second logic processing unit 306.

The output end of the temperature detection unit 302 is connected to the first end of the second comparison unit 304, the second end of the second comparison unit 304 is used for accessing a preset temperature signal, the output end of the second comparison unit 304 is connected to the input end of the second logic processing unit 306, and the output end of the second logic processing unit 306 is connected to the control end of the driving module 110. Specifically, the temperature detecting unit 302 is configured to detect an actual temperature of the driving module 110, and the second comparing unit 304 is configured to output a second warning signal from an output end of the second comparing unit 304 when an input signal at a first end of the second comparing unit 304 is greater than an input signal at a second end of the second comparing unit 304. It is to be understood that the second comparing unit 304 may also be configured to output the second normal signal from the output terminal of the second comparing unit 304 in case that the input signal of the first terminal of the second comparing unit 304 is less than or equal to the input signal of the second terminal of the second comparing unit 304. Optionally, the second normal signal and the second warning signal may be level signals, and the second normal signal and the second warning signal are different level signals. Alternatively, the second normal signal may be one of a low level signal and a high level signal, and the second warning signal may be the other of the low level signal and the high level signal. Alternatively, the temperature detection unit 302 may include a temperature sensor. Alternatively, the second logic processing unit 306 may include a CPLD (complex programmable logic device).

It can be understood that when it is required to detect other status signals of the driving module 110, the other status signals can be set according to the above embodiments, and are not described herein again.

Please refer to fig. 4, which illustrates a protection module according to a fourth embodiment of the present application. As shown in fig. 4, the protection module may include a current detection unit 202, a temperature detection unit 302, a third comparison unit 420, and a third logic processing unit 440. As shown in fig. 4, the third comparing unit 420 includes a first comparator 422 and a second comparator 424, and the third logic processing unit 440 includes a first input terminal and a second input terminal.

The input end of the current detection unit 202 is connected to the output end of the driving module 110, the output end of the current detection unit 202 is connected to the first input end of the first comparator 422, the second input end of the first comparator 422 is used for accessing a preset current signal, the output end of the first comparator 422 is connected to the first input end of the third logic processing unit 440, the output end of the temperature detection unit 302 is connected to the first input end of the second comparator 424, the second input end of the second comparator 424 is used for accessing a preset temperature signal, the output end of the second comparator 424 is connected to the second input end of the third logic processing unit 440, and the output end of the third logic processing unit 440 is connected to the control end of the driving module 110.

The description of the current detection unit 202 and the temperature detection unit 302 is detailed in the above embodiments, and is not repeated here. The first comparator 422 is configured to output a first warning signal from an output terminal of the first comparator 422 when the input signal at the first terminal of the first comparator 422 is greater than the input signal at the second terminal, and output a first normal signal from an output terminal of the first comparator 422 when the input signal at the first terminal of the first comparator 422 is less than or equal to the input signal at the second terminal of the first comparator 422; the second comparator 424 is configured to output a second warning signal from the output terminal of the second comparator 424 when the input signal of the first terminal of the second comparator 424 is greater than the input signal of the second terminal, and output a second normal signal from the output terminal of the second comparator 424 when the input signal of the second terminal of the second comparator 424 is less than or equal to the input signal of the second terminal of the second comparator 424, where the first warning signal and the first normal signal are different signals, and the second warning signal and the second normal signal are different signals. The third logic processing unit 440 is configured to output a stop signal from an output terminal of the third logic processing unit 440 when the first warning signal and/or the second warning signal are received. Alternatively, the third logic processing unit 440 may include a CPLD (complex programmable logic device).

In this embodiment, a logic processing unit may output a stop signal to the control end of the driving module 110 under the condition that the current output by the driving module 110 is too large and/or the driving module 110 is overheated, so as to avoid a current fault or an overheating fault occurring in the power driving circuit, and improve the reliability of the power driving circuit of the lathe tailstock.

Referring to fig. 5, a power driving circuit of a lathe tailstock according to a fifth embodiment of the present application is shown. The output terminal of the protection module 130 of the embodiment of the present application includes a first output terminal and a second output terminal. A first output terminal of the protection module 130 is connected to the control terminal of the driving module 110, and a second output terminal of the protection module 130 is connected to a first input terminal of the control module 120. The protection module 130 is configured to detect a status signal of the driving module 110, and output a stop signal from a first output end of the protection module 130 to control the driving module 110 to stop the driving motor 150 when the status signal is greater than a preset signal, and the protection module 130 is further configured to output an alarm signal from a second output end of the protection module 130 when the status signal is greater than the preset signal. Wherein the alarm signal is used to instruct the control module 120 to alarm. In this embodiment, the protection module 130 sends an alarm signal to the control module 120 to prompt the user that the driving module 110 has a safety risk, so as to improve the reliability of the power driving circuit of the lathe tailstock. In one embodiment, the alarm signal is used to instruct the control module 120 to sound an alarm tone.

With continued reference to fig. 5, the power driving circuit of the lathe tailstock may further include a limiting module 502. As shown in fig. 5, the output end of the limiting module 502 is connected to the third input end of the control module 120, and is used for detecting whether the tip mechanism reaches the threshold position. Wherein, the threshold position is the overtravel position of the travel of the centre mechanism. In one embodiment, the control drive module 110 stops the drive motor 150 when the stop module 502 indicates that the tip mechanism has reached the threshold position, thereby preventing over travel of the tip mechanism. In this embodiment, whether the tip mechanism reaches the threshold position is detected by the limiting module 502, and the control module 120 controls the driving module 110 according to the output signal of the limiting module 502.

Referring to fig. 5, the power driving circuit of the lathe tailstock may further include a photo isolator 504, wherein one end of the photo isolator 504 is connected to the output end of the limiting module 502, and the other end of the photo isolator 504 is connected to the second input end of the control module 120.

In one embodiment, the limit module 502 includes a first limit switch and a second limit switch. The first limit switch is arranged at a first threshold position of the lathe guide rail, the second limit switch is arranged at a second threshold position of the lathe guide rail, the second input end of the control module 120 comprises a fifth input end corresponding to the first limit switch and a sixth input end corresponding to the second limit switch, the output end of the first limit switch is connected with the fifth input end of the control module 120, and the output end of the second limit switch is connected with the sixth input end of the control module 120. It can be understood that the lathe tailstock can further comprise a transmission mechanism, the transmission mechanism comprises a sliding block and a screw rod, the first side of the sliding block is connected with the first side of the tip mechanism, the sliding block is connected with the lathe guide rail in a sliding mode, one end of the screw rod is mechanically connected with an output shaft of the motor 150, and the screw rod is further in transmission connection with the sliding block; when the motor 150 rotates, the screw rod is driven to drive the sliding block to reciprocate along the lathe guide rail, so that the tip mechanism is driven to be close to or far away from the workpiece. The tip mechanism may be considered over-travel when the slide block slides on the lathe rail beyond the first threshold position or the second threshold position. The present embodiment determines whether the tip mechanism reaches the threshold position by detecting whether the movement of the slide on the guide rail reaches the first threshold position and the second threshold position. It should be noted that the first threshold position may be a zero position of the slider, that is, whether the slider reaches the zero position may also be determined by the limiting module 502. Optionally, the first limit switch and/or the second limit switch may be an optoelectronic switch.

Referring to fig. 6, which shows a power driving circuit of a lathe tailstock provided in a sixth embodiment of the present application, as shown in fig. 6, the power driving circuit of a lathe tailstock provided in this embodiment may further include a pressure detecting unit 602 and a position detecting unit 604, as compared to the above embodiments.

Wherein, the pressure detecting unit 602 is connected to the third input end of the control module 120, and is used for detecting the pressure applied to the workpiece by the tip mechanism 606. The position detecting unit 604 is connected to the fourth input end of the control module 120, and is configured to detect the position of the tip mechanism. According to the embodiment of the application, the pressure detection unit 602 is arranged to detect the pressure applied to the workpiece by the center mechanism 606, the position detection unit 604 is used for detecting the position of the center mechanism 606, the control module 120 can control the current applied to the motor 150 according to the detection results fed back by the pressure detection unit 602 and the position detection unit 604, the pressure of the center mechanism 606 on the workpiece can be maintained according to needs, the sliding block 608 can be controlled to slide according to the set speed, the positioning operation is carried out, and the requirements of keeping concentricity and drilling of the shaft workpiece are met. Meanwhile, the volume of a power driving circuit of the lathe tailstock is reduced, and wiring is simplified.

In one embodiment, the pressure sensing unit 602 includes a pressure sensor having one end coupled to a first side of the slide 608 and another end coupled to a first side of the tip mechanism 606 to enable sensing of the pressure applied by the tip mechanism 606 to the workpiece. With continued reference to fig. 6, optionally, the power driving circuit of the lathe tailstock may further include a signal transmitter 610. Wherein, one end of the signal transmitter 610 is connected with the output of the pressure sensor, the other end of the signal transmitter 610 is connected with the control module 120, and the signal transmitter 610 is used for processing the pressure signal output by the pressure sensor, and the processing may include isolation processing.

In one embodiment, the position detection unit 604 comprises a rotary encoder. The rotary encoder is arranged on the motor 150 of the lathe tailstock and used for detecting the rotation angle of the motor 150, and the sliding distance of the slide block 608 can be known in advance every time the motor 150 rotates for one circle, so that the movement position of the slide block 608 can be determined according to the rotation angle of the motor 150, and the position of the tip mechanism 606 can be known. In one embodiment, the fourth input of the control module 120 may be a pulse input interface.

Referring to fig. 6, in an embodiment, the power driving circuit of the lathe tailstock may further include a display touch module 612. The display touch module 612 is connected to the input and output ends of the control module 120, and is used for displaying the pressure applied by the tip mechanism 606 to the workpiece and/or the position of the tip mechanism 606. Optionally, the display touch module 612 may include a touch screen, and the input and output ends of the control module 120 are LCD interfaces. In one embodiment, the display touch module 612 may also be used to acquire process parameters, which may be input by a user, which may include, but are not limited to, the speed of movement of the tip mechanism 606, the position of the tip mechanism 606, the pressure applied by the tip mechanism 606 to the workpiece, the current values of the rotary encoder, and the like.

With continued reference to fig. 6, in one embodiment, the power driving circuit of the lathe tailstock may further include a numerical control system 614, and the numerical control system 614 is connected to the control module 120 through a numerical control system interface of the control module. The user can control the motor 150 of the lathe tailstock by controlling the control signal output by the control module 120 through the numerical control system 614. In one embodiment, control module 120 includes an STM32F407 chip.

Referring to fig. 7, a power driving circuit of a lathe tailstock according to a seventh embodiment of the present disclosure is shown, as shown in fig. 7, the power driving circuit of a lathe tailstock includes a touch screen 702, a numerical control system 614, a microcontroller 704, a driving unit 112, an IGBT unit 114, a rectifying circuit 160, a rotary encoder 706, a pressure sensor 708, a current sampling circuit 710, a protection module 130, a signal amplifier 208, a signal transmitter 610, a limit module 502, and an optoelectronic isolator 504. The microcontroller 704 adopts an STM32F407 chip, and an LCD interface, an AD converter and a PWM control logic circuit are built in the microcontroller. Specifically, the numerical control system 614 is connected with the microcontroller 704 through a numerical control system interface of the microcontroller 704, the touch screen 702 is connected with the microcontroller 704 through an LCD interface of the microcontroller 704, a PWM output interface of the microcontroller 704 is connected with an input end of the driving unit 112, an output end of the driving unit 112 is connected with a control end of the IGBT unit 114 for controlling on/off of the input end and the output end of the IGBT unit 114, an input end of the rectifying circuit 160 is connected with the power supply 140, an output end of the rectifying circuit 160 is connected with an input end of the IGBT unit 114, an output end of the IGBT unit 114 is connected with the ac servo motor 712, the rotary encoder 706 is mounted at an end portion of the ac servo motor 712, the rotary encoder 706 is connected with a pulse input interface of the microcontroller 704, one end of the pressure sensor 708 is connected with a slider 608 of a screw rod, an output shaft of the ac servo motor 712 is connected with the screw rod, and the other end of the pressure sensor 708 is connected with the tip mechanism 606, the output end of the pressure sensor 708 is connected with one end of the signal transmitter 610, the other end of the signal transmitter 610 is connected with a first ADC interface of the microcontroller 704, the input end of the current sampling circuit 710 is connected with the output end of the IGBT unit 114, the output end of the current sampling circuit 710 is connected with the input end of the protection module 130 and the input end of the signal amplifier 208, the first output end of the protection module 130 is connected with the input end of the driving unit 112 and the first input end of the microcontroller 704, the output end of the signal amplifier 208 is connected with a second ADC interface of the microcontroller 704, the output end of the limit module 502 is connected with one end of the optoelectronic isolator 504, and the other end of the optoelectronic isolator 504 is connected with a digital quantity input interface of the microcontroller 704.

The working principle of the power driving circuit of the lathe tailstock is briefly described as follows: the ac power output from the power source 140 is rectified into dc power by the rectifying circuit 160 and then output to the IGBT unit 114, and the microcontroller 704 calculates required control parameters (such as frequency and amplitude parameters) according to process parameters input through the display touch screen 702 and/or the numerical control system 614, sends a PWM signal to the driving unit 112 to control the IGBT unit 114, and converts the dc power output from the rectifying circuit 160 from the IGBT unit 114 into a current of the ac servo motor 712 to drive the ac servo motor 712 to rotate. During the operation of the ac servo motor 712, the microcontroller 704 adjusts the width of the level applied to the IGBT unit 114 in real time according to the position of the tip mechanism 606 fed back by the rotary encoder 706 and the pressure applied to the workpiece by the tip mechanism 606 fed back by the pressure sensor 708, thereby performing the pressure control and feeding functions; when the pressure applied to the workpiece is excessive or the current input to the ac servomotor 712 is excessive, the output of the IGBT unit 114 is immediately cut off to protect the ac servomotor 712, the tip mechanism 606, and the power drive circuit of the lathe tailstock.

In one embodiment, there is also provided a lathe tailstock comprising the power driving circuit of the lathe tailstock described in any one of the above embodiments.

In one embodiment, a lathe is also provided, which includes the lathe tailstock described in the above embodiments.

In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A power driving circuit of a lathe tailstock is characterized in that the lathe tailstock comprises a tip mechanism and a motor used for driving the tip mechanism to process a workpiece, and the power driving circuit comprises:

the input end of the driving module is connected with a power supply, and the output end of the driving module is connected with the motor;

the output end of the control module is connected with the control end of the driving module and used for outputting a control signal; the control signal is used for controlling the driving module to drive the motor to work;

the output end of the protection module is connected with the control end of the driving module and used for detecting a state signal of the driving module and outputting a stop signal from the output end of the protection module to control the driving module to stop driving the motor to work under the condition that the state signal is greater than a preset signal; the state signal is used for reflecting the working state of the driving module.

2. The power driving circuit of a lathe tailstock according to claim 1, wherein the status signal comprises an actual current at an output end of the driving module, the preset signal comprises a preset current signal, and the protection module comprises:

the input end of the current detection unit is connected with the output end of the driving module, and the current detection unit is used for detecting the actual current and outputting a corresponding current detection signal from the output end of the current detection unit;

the first end of the first comparison unit is connected with the output end of the current detection unit, and the second end of the first comparison unit is used for accessing the preset current signal;

the input end of the first logic processing unit is connected with the output end of the first comparison unit, the output end of the first logic processing unit is connected with the control end of the driving module, the first logic processing unit is used for outputting the stop signal from the output end of the logic processing unit under the condition that a first early warning signal is received, and the first early warning signal is used for indicating that the current detection signal is greater than the preset current signal.

3. The power driving circuit of a lathe tailstock according to claim 1, wherein the status signal comprises an actual temperature of the driving module, the preset signal comprises a preset temperature signal, and the protection module comprises:

the temperature detection unit is used for detecting the actual temperature and outputting a corresponding temperature detection signal from the output end of the temperature detection unit;

the first end of the second comparison unit is connected with the output end of the temperature detection unit, and the second end of the second comparison unit is used for accessing the preset temperature signal;

and the input end of the second logic processing unit is connected with the output end of the second comparison unit, the output end of the second logic processing unit is connected with the control end of the driving module, and the second logic processing unit is used for outputting a stop signal from the output end of the logic processing unit under the condition of receiving a second early warning signal, and the second early warning signal is used for indicating that the temperature detection signal is greater than the preset temperature signal.

4. The power driving circuit of the lathe tailstock according to claim 1, wherein the output end of the protection module comprises a first output end and a second output end, and the first output end is connected with the control end of the driving module and used for outputting a stop signal;

the second output end is connected with the first input end of the control module, the protection module is further used for outputting an alarm signal from the second output end under the condition that the state signal is greater than a preset signal, and the alarm signal is used for indicating that the control module gives an alarm.

5. The power driving circuit of a lathe tailstock according to claim 1, characterized by further comprising:

and the output end of the limiting module is connected with the second input end of the control module and is used for detecting whether the tip mechanism reaches a threshold position.

6. The power driving circuit of a lathe tailstock according to claim 1, characterized by further comprising:

the pressure detection unit is connected with the third input end of the control module and used for detecting the pressure applied to the workpiece by the tip mechanism;

and the position detection unit is connected with the fourth input end of the control module and is used for detecting the position of the tip mechanism.

7. The power driving circuit of the lathe tailstock according to claim 6, further comprising a transmission mechanism, wherein the transmission mechanism comprises a slide block and a screw rod, a first side of the slide block is connected with a first side of the tip mechanism, the slide block is slidably connected with a lathe guide rail, one end of the screw rod is mechanically connected with the motor output shaft, and the screw rod is further in transmission connection with the slide block; when the motor rotates, the screw rod is driven to drive the sliding block to reciprocate along the guide rail, so that the tip mechanism is driven to be close to or far away from the workpiece; the pressure detection unit comprises a pressure sensor, one end of the pressure sensor is connected with the first side of the sliding block, and the other end of the pressure sensor is connected with the second side of the tip mechanism.

8. The power driving circuit of the lathe tailstock according to claim 6, further comprising a display touch module connected to the input and output ends of the control module for displaying the pressure applied by the tip mechanism to the workpiece and/or the position of the tip mechanism.

9. Lathe tailstock characterized in that it comprises a power driving circuit of a lathe tailstock according to any one of claims 1 to 8.

10. A lathe characterized by comprising a tailstock according to claim 9.

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