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CN-122008362-A - Active retracting type table saw based on precontacted multiple induction and control method thereof

CN122008362ACN 122008362 ACN122008362 ACN 122008362ACN-122008362-A

Abstract

The invention discloses an active retracting table saw based on precontacted multiple induction and a control method thereof, and relates to the technical field of electric tools. The utility model provides an initiative withdrawal type table saw based on multiple response of precontact, includes saw bit, table saw table surface, and the back of table saw table surface of saw bit front side is installed microwave/radar precontact early warning module, human separate empty inductive switch, field effect transistor inductive module, is equipped with metal dust collection/safety cover touch-sensitive module on the dust collecting cover of the upper portion of saw bit, and the step motor of table saw is from electrified outage brake. The invention has the advantages of early warning, multiple physical isolation guarantees, avoiding serious injury from the source, millisecond response speed, safer zero consumable maintenance cost, obviously reduced use threshold, humanized operation logic, safety and efficiency, high universality and adaptation to various industrial scenes.

Inventors

  • QIN SIBO
  • QIN YI

Assignees

  • 秦思博

Dates

Publication Date
20260512
Application Date
20260306

Claims (8)

  1. 1. The utility model provides an initiative withdrawal type table saw based on contact multiplex response in advance, including the saw bit, the table saw, table saw table surface, its characterized in that, the back side of saw bit front side table saw table surface installs microwave/radar pre-contact early warning module (1), human blank induction switch (2), field effect tube induction module (3), be equipped with metal dust collection/safety cover touch induction module (4) on the dust cage on upper portion of saw bit, the step motor of table saw is from electrified circuit outage brake (5), microwave/radar pre-contact early warning module (1) and PLC control unit (6) electric connection, PLC control unit (6) are in human blank induction switch (2), field effect tube induction module (3), metal dust collection/safety cover touch induction module (4), table saw electric connection respectively.
  2. 2. The active retracting table saw based on the precontact multiple sensing according to claim 1, wherein a high-speed electric push rod (7) is fixedly connected to the lower portion of the table saw in a threaded manner, the lower portion of the high-speed electric push rod (7) is fixedly connected to a lower frame of a table surface of the table saw in a threaded manner, and the push-up height of the high-speed electric push rod (7) is larger than the height of the saw blade leaking out of the table surface of the table saw.
  3. 3. An active retracting table saw based on precontacting multiple sensing according to claim 1, wherein a red scram button (8) is provided on the back side of the table surface of the table saw, the red scram button (8) being connected in series with the main power circuit.
  4. 4. The active retracting table saw based on the precontact multiple sensing according to claim 1, wherein an audible and visual alarm and LED indication module (9) is arranged on the left side edge of the table surface of the table saw, and the audible and visual alarm and LED indication module (9) is electrically connected with the PLC control unit (6).
  5. 5. The active retraction type table saw based on precontact multiple induction according to claim 1, wherein an internet of things current monitoring module (10) is arranged on the back surface of a table surface of the table saw, an audible and visual alarm and remote notification module (11) is arranged on the right side edge of the table surface of the table saw, and the internet of things current monitoring module (10) is connected with a stepping motor, a high-speed electric push rod (7) and the audible and visual alarm and remote notification module (11) through an independent fault shutdown control loop.
  6. 6. An actively retracting table saw based on precontacted multiple sensing according to claim 1, characterized in that the metal dust collection/protection cover touch sensing module (4) is connected to the metal cover by extension wires.
  7. 7. The method for controlling the active retracting table saw based on the precontact multiple sensing of claim 1, which is characterized by comprising the following steps of A system human body safety protection flow and B system equipment fault protection flow, S1, human body safety protection flow of a system A: when a human body enters a preset dangerous area with a preset distance value in front of a saw blade, a microwave/radar pre-contact early warning module (1) on the back of the table saw detects that human tissue is approaching to send out an electric signal, and a PLC (programmable logic controller) unit (6) receives the signal of the microwave/radar pre-contact early warning module (1) and then performs the following actions: the power supply of the acousto-optic alarm and LED indication module (9) acousto-optic alarm device is connected with the human body space-isolation induction switch (2) and the field effect tube induction module (3), and the LED indication lamp corresponding to the microwave/radar pre-contact early warning module (1) is lightened, and the early warning is only carried out at the stage, and the shutdown or saw blade recovery is not triggered; When the human body continues to approach to a short-distance dangerous area with a preset distance value in front of the saw blade, the second-stage triple independent human body danger confirmation is carried out, wherein after any one of the human body space sensing switch (2), the field effect tube sensing module (3) and the metal dust collection/protection cover touch sensing module (4) detects the approach of the human body, a danger signal is independently output, and the power supply of a motor of the bench saw is directly cut off; The human body protection action flow comprises that after any one of a human body isolating induction switch (2), a field effect tube induction module (3) and a metal dust collection/protection cover touch induction module (4) is triggered, a solid relay arranged in the bench saw immediately cuts off a power supply of the bench saw, and meanwhile, a stepping motor is started from an electromagnetic power-off brake (5) with the stepping motor to stop a saw blade; The human body protection and recovery flow is that after the protection action is finished, the system cannot be automatically recovered, the human body leaves the dangerous area through manual confirmation, an operator manually presses an independently arranged recovery button, the PLC control unit (6) starts the recovery flow, the high-speed electric push rod (7) slowly lifts the saw blade back to the working position, after the time delay is about 5 seconds, the soft starter starts the motor of the table saw to gradually accelerate the motor from a low speed to a rated rotation speed, the system is recovered to a normal working state, and a manual recovery mechanism can avoid the phenomenon that the operator unconsciously approaches the saw blade due to sudden health conditions; s2, a failure protection flow of B system equipment: the current monitoring of the Internet of things comprises the steps that an Internet of things current monitoring module (10) monitors the running current of a motor in real time through a current sensor, wherein the monitoring content comprises abnormal rise of current, abnormal current fluctuation, current dip and unbalanced current, and the monitoring process is completely independent of a human body protection system and runs continuously; When the current monitoring module (10) of the Internet of things detects any abnormality, immediately outputting an independent fault stop signal, directly cutting off a motor power supply, starting an electromagnetic power-off brake (5), stopping a saw blade, starting a high-speed electric push rod (7), retracting the saw blade to an inner bin, synchronously communicating with an audible and visual alarm and an LED indication module (9) to light a fault LED indication lamp, starting an on-site audible and visual alarm, recording an event as 'fault stop' by the current monitoring module (10) of the Internet of things based on the logic of independent test verification, and sending fault alarm information to a factory equipment management department by the communicating audible and visual alarm and remote notification module (11), wherein the process is completely separated from a human body protection process, does not share a triggering condition and does not share logic judgment; the fault recovery process comprises the steps of troubleshooting and removing faults by equipment management personnel, manually pressing a recovery button, slowly lifting the saw blade back to a working position by a high-speed electric push rod (7), starting a motor of the table saw by a soft starter to gradually accelerate the motor to a rated rotating speed, and recovering the system to a normal working state.
  8. 8. The method for controlling an active retracting table saw based on precontacted multiple sensing according to claim 7, wherein the three modules of human body space sensing switch (2), field effect tube sensing module (3) and metal dust collection/protection cover touch sensing module (4) in the second-stage triple independent human body danger confirmation are independent of each other, and the motor power supply of the table saw can be cut off independently after detecting the danger.

Description

Active retracting type table saw based on precontacted multiple induction and control method thereof Technical Field The invention relates to the technical field of electric tools, in particular to an active retracting table saw based on precontact multiple induction and a control method thereof. Background The bench saw is used as core equipment in industries such as wood processing, furniture manufacturing and the like, and a high-speed rotating saw blade (the linear speed is usually over 50 m/s) brings extremely high safety risks while improving the processing efficiency. According to the U.S. Consumer Product Safety Committee (CPSC) statistics, the number of severe injuries to broken fingers, amputation, etc. caused by table saw operations in the united states alone exceeds 3.6 tens of thousands of times per year, of which about 70% originate from accidental access of operator fingers to the saw blade hazard area. The safety protection means of conventional table saws have significant limitations, in particular: 1. mechanical protection device For example, passive protection tools such as a protective cover and a pushing rod are required to be actively matched by operators, and the protective effect is greatly reduced because the sight line or the operation flexibility is influenced in actual operation. 2. Contact safety system As represented by the "skin-sensing braking technique" by samwstop, usa, braking is triggered by a change in capacitance when the saw blade contacts the human body, but has the following drawbacks: response delay, 0.08-0.1 seconds from contact to complete stop of the saw blade, may still cause deep cuts; the consumable cost is high, after triggering, the saw blade and the brake assembly need to be replaced integrally, and the single maintenance cost exceeds $200; false triggering risk that non-contact misoperation is easily caused by wet wood and metal impurities. 3. Infrared/laser zone protection The infrared correlation or laser scanning is adopted to define the dangerous area, but the dangerous area is severely interfered by dust and wood dust, the failure rate in the woodworking environment is as high as more than 15%, the human body and the workpiece cannot be distinguished, and the production efficiency is affected by frequent error shutdown. 4. PLC centralized control scheme Traditional industrial safety systems rely on a PLC as a control core, but the scanning period (usually 10-20 ms) of the PLC is difficult to meet the requirement of safety response of a bench saw in millisecond level, and single-point faults can lead to paralysis of the whole system, and do not meet the industrial design trend of 'extremely simple maintenance'. Summary of pain spots in industry The current market lacks a table saw safety solution that combines very fast response, zero touch triggering, low cost maintenance, multiple redundancy protection. The prior art either sacrifices response speed to be replaced by reliability, or relies on expensive disposable consumables, or is difficult to maintain due to complex structure, and the core requirement of small and medium processing enterprises on safety and economical balance cannot be met. Disclosure of Invention The invention aims to provide an active retracting table saw based on precontact multiple induction and a control method thereof, which solve the problem that the current market lacks a table saw safety solution with extremely fast response, zero contact triggering, low-cost maintenance and multiple redundancy protection. In order to achieve the above purpose, the present invention provides the following technical solutions: The utility model provides an initiative withdrawal type table saw based on multiple response of contact in advance, including the saw bit, the table saw, table saw table surface, the back side of table saw table surface of saw bit front side is installed microwave/radar and is contacted early warning module, human sky inductive switch, field effect transistor inductive module in advance, be equipped with metal dust collection/safety cover touch-sensitive module on the dust cage of upper portion of saw bit, the step motor of table saw is from electrified circuit outage brake, microwave/radar is contacted early warning module and PLC control unit electric connection in advance, the PLC control unit separates empty inductive switch in the human body, field effect transistor inductive module, metal dust collection/safety cover touch-sensitive module, table saw electric connection respectively. Further, the lower portion spiro union of table saw is fixed with high-speed electric putter, and high-speed electric putter's lower part spiro union is fixed on table saw table surface's lower frame, and high-speed electric putter's push-up height is greater than the saw bit and spills table saw table surface's height. Further, a red emergency stop button is arranged on the side edge of the back surface of the table saw working ta