Machine tool numerical control system and tool setting control signal transmission device thereof

Abstract

The utility model discloses a machine tool numerical control system and a tool setting control signal transmission device thereof, the tool setting control signal transmission device comprises a signal receiving module and a signal transmitting module arranged on a tool cutter, the signal transmitting module comprises a first control unit; the triggering unit is used for generating a triggering signal when detecting that the tool knife is in contact with the workpiece; the signal transmitting unit is used for randomly transmitting a plurality of tool setting control signals within a fixed duration after the trigger signal is generated; the signal receiving module comprises a second control unit; the plurality of signal receiving units are respectively used for receiving the tool setting control signals sent by the signal transmitting module, and the setting positions of the plurality of signal receiving units are different; and the signal output unit is used for outputting the tool setting compensation signal under the control when the fixed duration after the trigger signal is generated is ended. By implementing the technical scheme of the utility model, communication failure caused by sudden wireless interference can be resisted, and meanwhile, the aim of resisting multipath fading can be fulfilled.

Description

Technical Field

[0001] The utility model relates to the field of high-precision machine tool processing, in particular to a machine tool numerical control system and a tool setting control signal transmission device thereof. Background Art

[0002] When a high-precision machine tool is processing a workpiece, the tool knife and the workpiece must be accurately aligned to confirm the origin of the workpiece. During the tool alignment, a trigger signal is generated when the tool knife contacts the workpiece. This signal needs to be sent to the machine tool control device accurately and quickly so that the machine tool control device knows the trigger time when the tool knife contacts the workpiece.

[0003] However, since the tool knife works in a high-speed rotation scenario, it is impossible to use wired transmission to transmit signals. Currently, wireless one-to-one transmission is mostly used. Although short delays can be achieved, the transmitted trigger signal is easily interfered with due to the presence of other nearby tool knives, resulting in occasional transmission failures. In addition, since the tool knife works in a high-speed rotation scenario, the signal transmitting antenna may be at any position on the circumference of the tool knife. In this way, there are multiple possible wireless transmission paths from the wireless signal to the receiving device, which is prone to multipath fading, which can also cause signal transmission failure. If the signal transmission fails, the machine tool control device will not be able to know the trigger time for the precise tool alignment of the tool knife and the workpiece, and thus cannot perform precise tool alignment control. What is more serious is that the tool knife or workpiece may be damaged, resulting in high losses. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a machine tool numerical control system and a tool setting control signal transmission device thereof in view of the above technical defects in the prior art.

[0005] The utility model solves the technical problem by adopting a technical solution: constructing a tool setting control signal transmission device, including a signal receiving module and a signal transmitting module arranged on a tool knife,

[0006] The signal transmission module comprises:

[0007] a first control unit;

[0008] A trigger unit connected to the first control unit and configured to generate a trigger signal and transmit the trigger signal to the first control unit when contact between the tool knife and the workpiece is detected;

[0009] A signal transmitting unit connected to the first control unit and used for randomly transmitting a plurality of tool setting control signals within a fixed time period after the trigger signal is generated under the control of the first control unit, wherein the tool setting control signal includes a delay time of this transmission, and the delay time is the time between the generation time of the trigger signal and the current transmission time of the tool setting control signal;

[0010] The signal receiving module comprises:

[0011] a second control unit;

[0012] A plurality of signal receiving units connected to the second control unit and respectively used to receive the tool setting control signals sent by the signal transmitting module, and the plurality of signal receiving units are arranged at different positions;

[0013] A signal output unit connected to the second control unit and used for outputting a tool compensation signal at the end of a fixed time after the trigger signal is generated under the control of the second control unit.

[0014] Preferably, the signal transmitting unit is a LoRa signal transmitting unit; and the signal receiving unit is a LoRa signal receiving unit.

[0015] Preferably, the signal transmitting unit is a ZigBee signal transmitting unit; and the signal receiving unit is a ZigBee signal receiving unit.

[0016] Preferably, the signal transmitting unit is a Bluetooth signal transmitting unit; and the signal receiving unit is a Bluetooth signal receiving unit.

[0017] Preferably, the signal transmitting unit is a WIFI signal transmitting unit; and the signal receiving unit is a WIFI signal receiving unit.

[0018] Preferably, the signal transmitting unit is a 433M wireless signal transmitting unit; and the signal receiving unit is a 433M wireless signal receiving unit.

[0019] Preferably, the trigger unit is a touch switch.

[0020] Preferably, the touch switch comprises a trigger and a conversion circuit, wherein:

[0021] The trigger member includes two terminals and a plurality of balls disposed between the two terminals, and the plurality of balls form a passage between the two terminals to electrically connect the two terminals when not in contact with the workpiece; and disconnect the electrical connection between the two terminals when in contact with the workpiece;

[0022] The conversion circuit includes a resistor R10, a resistor R18, a resistor R14, and a transistor Q4, wherein the first end of the resistor R10 and the first end of the resistor R18 are respectively connected to a high level, the second end of the resistor R10 is respectively connected to the first terminal of the trigger component and the first end of the resistor R14, the second terminal of the trigger component is grounded, the second end of the resistor R14 is connected to the base of the transistor Q4, the emitter of the transistor Q4 is grounded, and the collector of the transistor Q4 is connected to the second end of the resistor R18 and the input end of the first control unit.

[0023] Preferably, the conversion circuit further includes:

[0024] a bidirectional voltage regulator connected between the first terminal of the trigger element and ground; and / or,

[0025] A capacitor connected between the first terminal of the trigger element and ground.

[0026] The utility model also constructs a machine tool numerical control system, including a machine tool control device, and also includes a tool setting control signal transmission device corresponding to each tool knife, and the tool setting control signal transmission device is the tool setting control signal transmission device described above.

[0027] By implementing the technical solution of the utility model, after the tool knife contacts the workpiece, since the signal transmitting module can randomly delay sending multiple tool setting control signals, even if there is interference at a certain moment, it can still be guaranteed that the signal receiving module can receive at least one of the tool setting control signals, that is, it can resist communication failures caused by sudden wireless interference. At the same time, since the signal receiving module has multiple independent signal receiving units, a multipath wireless receiving function can be realized, and the generation time of the trigger signal can be obtained when any signal is successfully received, so the purpose of resisting multipath fading is achieved. Therefore, the tool setting control signal transmission device ensures the successful transmission of the tool setting control signal, and enables the machine tool control device to accurately know the trigger time of the precise tool setting of the tool knife and the workpiece, thereby facilitating precise tool setting control and avoiding damage to the tool knife or the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0029] Figure 1 This is a logical structure diagram of the first embodiment of the tool setting control signal transmission device of the utility model;

[0030] Figure 2 The utility model is a circuit diagram of a light touch switch. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Figure 1 It is a logical structure diagram of the first embodiment of the tool setting control signal transmission device of the utility model. The tool setting control signal transmission device of this embodiment includes a signal transmitting module 10 and a signal receiving module 20, wherein the signal transmitting module 10 is arranged on the tool knife, and the signal receiving module 20 is connected to the machine tool control device in the machine tool numerical control system.

[0033] In this embodiment, if Figure 1 As shown, the signal transmitting module 10 includes a first control unit 11 and a signal transmitting unit 12 and a trigger unit 13 respectively connected to the first control unit 11. The trigger unit 13 is used to generate a trigger signal and transmit it to the first control unit 11 when it detects that the tool knife is in contact with the workpiece; the signal transmitting unit 12 is used to randomly send a plurality of tool setting control signals within a fixed time after the trigger signal is generated under the control of the first control unit 11, wherein the tool setting control signal includes a delay time of this transmission, and the delay time is the time between the generation time of the trigger signal and the current transmission time of the tool setting control signal.

[0034] In this embodiment, if Figure 1As shown, the signal receiving module 20 includes a second control unit 21 and a signal output unit 23 respectively connected to the second control unit 21, and three signal receiving units 22, 22′, and 22″. It should be understood that in other embodiments, the signal receiving unit may be a number greater than 1, and the arrangement positions of the multiple signal receiving units are different. Among them, the signal receiving units 22, 22′, and 22″ are respectively used to receive the tool setting control signal sent by the signal transmitting module 10; the signal output unit 23 outputs the tool setting compensation signal at the end of a fixed time after the trigger signal is generated under the control of the second control unit 21. Specifically, after the signal receiving unit 22 transmits the received tool setting control signal to the second control unit 21, the second control unit 21 can calculate the generation time of the trigger signal according to the reception time of the tool setting control signal and the delay time in the tool setting control signal, and then calculate the remaining time from the current time (the reception time of the tool setting control signal) to the end of the fixed time (known), and control the signal output unit 23 to output the tool setting compensation signal at the end of the remaining time, that is, the time between the generation time of the trigger signal and the output time of the tool setting compensation signal is a fixed value (fixed time). After receiving the tool setting compensation signal, the machine tool control device can compensate for the process or accuracy of the tool knife within the fixed time, so as to perform precise tool setting control.

[0035] Through the technical solution of this embodiment, since the signal transmitting module can randomly delay the sending of multiple tool setting control signals, even if there is interference at a certain moment, it can still be guaranteed that the signal receiving module can receive at least one of the tool setting control signals, that is, it can resist the communication failure caused by sudden wireless interference. At the same time, since the signal receiving module has multiple independent signal receiving units, the multipath wireless receiving function can be realized, and the generation time of the trigger signal can be obtained when any signal is successfully received, so the purpose of resisting multipath fading is achieved. Therefore, the tool setting control signal transmission device ensures the successful transmission of the tool setting control signal, and enables the machine tool control device to accurately know the trigger time of the precise tool setting of the tool knife and the workpiece, thereby facilitating precise tool setting control and avoiding damage to the tool knife or the workpiece.

[0036] In a specific embodiment, for the signal transmission module 10, after receiving the trigger signal sent by the trigger unit 13, the first control unit 11 generates multiple transmission signals (tool control signals) and completes the complete transmission of the multiple transmission signals within a fixed time length, that is, the total transmission time is a fixed time length, but the delay between each two transmission signals is random. In addition, each transmission signal includes but is not limited to: the unique address of the trigger unit, the delay time from the generation of the trigger signal to each transmission, and the transmission sequence number. For the signal receiving module 20, when the second control unit 21 receives the wireless signal received by any signal receiving unit, if the unique address of the trigger unit in the wireless signal does not match the signal receiving module 20, no processing is performed; if it matches, the wireless signal is processed immediately, and then, according to the delay time tx carried in the wireless signal (the time between the generation time of the trigger signal and the time of this transmission), the transmission time ts of this wireless signal, and the known fixed time T, the remaining time tm for the signal output unit 23 to output the tool compensation signal can be calculated, that is, tm=T-(tx+ts), and the signal output unit 23 is controlled to output the tool compensation signal when the remaining time tm ends.

[0037] Furthermore, there may be multiple signal transmission modes between the signal transmitting unit 12 and the signal receiving unit 22. In a first optional embodiment, the signal transmitting unit is a LoRa signal transmitting unit; and the signal receiving unit is a LoRa signal receiving unit. In a second optional embodiment, the signal transmitting unit is a ZigBee signal transmitting unit; and the signal receiving unit is a ZigBee signal receiving unit. In a third optional embodiment, the signal transmitting unit is a Bluetooth signal transmitting unit; and the signal receiving unit is a Bluetooth signal receiving unit. In a fourth optional embodiment, the signal transmitting unit is a WIFI signal transmitting unit; and the signal receiving unit is a WIFI signal receiving unit. In a fifth optional embodiment, the signal transmitting unit is a 433M wireless signal transmitting unit; and the signal receiving unit is a 433M wireless signal receiving unit.

[0038] Further, in an optional embodiment, the trigger unit is a touch switch.

[0039] In a specific embodiment, in combination Figure 2, the touch switch includes a trigger J4 and a conversion circuit, wherein the trigger J4 includes two terminals and a plurality of balls (not shown) arranged between the two terminals, and the plurality of balls form a path between the two terminals to electrically connect the two terminals when the touch switch (arranged on the edge of the tool) is not in contact with the workpiece, and disconnect the electrical connection of the two terminals when in contact with the workpiece. The conversion circuit includes a resistor R10, a resistor R18, a resistor R14, and a transistor Q4, wherein the first end of the resistor R10 and the first end of the resistor R18 are respectively connected to a high level (2.8V), the second end of the resistor R10 is respectively connected to the first end of the trigger J4 and the first end of the resistor R14, the second end of the trigger J4 is grounded, the second end of the resistor R14 is connected to the base of the transistor Q4, the emitter of the transistor Q4 is grounded, and the collector of the transistor Q4 is connected to the second end of the resistor R18 and the input end (SW_IN) of the first control unit. In addition, the bidirectional voltage regulator D1 and the capacitor C47 are respectively connected between the first end of the trigger J4 and the ground.

[0040] The working principle of the touch switch is described below: when the touch switch is not in contact with the workpiece, the two terminals of the trigger member J4 are connected, and the transistor Q4 is not turned on, thereby inputting a high-level signal to the input terminal (SW_IN) of the first control unit; when the touch switch is in contact with the workpiece, the two terminals of the trigger member J4 are disconnected, and the transistor Q4 is turned on, thereby inputting a low-level signal to the input terminal (SW_IN) of the first control unit. Therefore, the first control unit can collect the trigger signal generated when the tool knife contacts the workpiece through the signal edge interruption at its input terminal, and the response time for collecting the trigger signal reaches the microsecond level.

[0041] The utility model also constructs a machine tool numerical control system, which includes a machine tool control device and a tool setting control signal transmission device corresponding to each tool knife, and the tool setting control signal transmission device is the tool setting control signal transmission device described above.

[0042] The above description is only the preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the scope of the claims of the utility model.

Claims

1. A tool setting control signal transmission device, comprising a signal receiving module and a signal transmitting module arranged on a tool knife, characterized in that: The signal transmission module comprises: a first control unit; A trigger unit connected to the first control unit and configured to generate a trigger signal and transmit the trigger signal to the first control unit when contact between the tool knife and the workpiece is detected; A signal transmitting unit connected to the first control unit and used for randomly transmitting a plurality of tool setting control signals within a fixed time period after the trigger signal is generated under the control of the first control unit, wherein the tool setting control signal includes a delay time of this transmission, and the delay time is the time between the generation time of the trigger signal and the current transmission time of the tool setting control signal; The signal receiving module comprises: a second control unit; A plurality of signal receiving units connected to the second control unit and respectively used to receive the tool setting control signals sent by the signal transmitting module, and the plurality of signal receiving units are arranged at different positions; A signal output unit connected to the second control unit and used for outputting a tool compensation signal at the end of a fixed time after the trigger signal is generated under the control of the second control unit.

2. The tool setting control signal transmission device according to claim 1, characterized in that: The signal transmitting unit is a LoRa signal transmitting unit; and the signal receiving unit is a LoRa signal receiving unit.

3. The tool setting control signal transmission device according to claim 1, characterized in that: The signal transmitting unit is a ZigBee signal transmitting unit; and the signal receiving unit is a ZigBee signal receiving unit.

4. The tool setting control signal transmission device according to claim 1, characterized in that: The signal transmitting unit is a Bluetooth signal transmitting unit; and the signal receiving unit is a Bluetooth signal receiving unit.

5. The tool setting control signal transmission device according to claim 1, characterized in that: The signal transmitting unit is a WIFI signal transmitting unit; the signal receiving unit is a WIFI signal receiving unit.

6. The tool setting control signal transmission device according to claim 1, characterized in that: The signal transmitting unit is a 433M wireless signal transmitting unit; the signal receiving unit is a 433M wireless signal receiving unit.

7. The tool setting control signal transmission device according to claim 1, characterized in that: The trigger unit is a touch switch.

8. The tool setting control signal transmission device according to claim 7, characterized in that: The touch switch includes a trigger and a conversion circuit, wherein: The trigger member includes two terminals and a plurality of balls disposed between the two terminals, and the plurality of balls form a passage between the two terminals to electrically connect the two terminals when not in contact with the workpiece; and disconnect the electrical connection between the two terminals when in contact with the workpiece; The conversion circuit includes a resistor R10, a resistor R18, a resistor R14, and a transistor Q4, wherein the first end of the resistor R10 and the first end of the resistor R18 are respectively connected to a high level, the second end of the resistor R10 is respectively connected to the first terminal of the trigger component and the first end of the resistor R14, the second terminal of the trigger component is grounded, the second end of the resistor R14 is connected to the base of the transistor Q4, the emitter of the transistor Q4 is grounded, and the collector of the transistor Q4 is connected to the second end of the resistor R18 and the input end of the first control unit.

9. The tool setting control signal transmission device according to claim 8, characterized in that: The conversion circuit also includes: a bidirectional voltage regulator connected between the first terminal of the trigger element and ground; and / or, A capacitor connected between the first terminal of the trigger element and ground.

10. A machine tool numerical control system, comprising a machine tool control device, characterized in that: It also includes a tool setting control signal transmission device corresponding to each tool knife, and the tool setting control signal transmission device is the tool setting control signal transmission device according to any one of claims 1 to 9.

Images