Magnetic drill press with full-automatic feed speed control function

Abstract

The utility model provides a magnetic drill press with a full-automatic feed speed control function, which comprises an electromagnetic adsorption base used for being fixed on the surface of a workpiece; the fixing frame is fixedly connected to the electromagnetic adsorption base; the sliding mechanism is connected to the fixed frame in a sliding manner; the drilling motor is fixedly connected to the sliding mechanism; and the automatic cutter feeding mechanism is connected to the fixing frame, the automatic cutter feeding mechanism is connected with the sliding mechanism, and the automatic cutter feeding mechanism detects and dynamically adjusts the cutter feeding speed through the real-time load current of the drilling motor. The utility model solves the problems that the magnetic drill press in the prior art is lack of an effective load detection and speed regulation mechanism, and efficiency and equipment protection are difficult to consider at the same time.

Description

Technical Field

[0001] This application belongs to the field of drilling machine technology, and more specifically, relates to a magnetic drill with fully automatic feed speed control. Background Technology

[0002] Traditional magnetic drills operate at a fixed feed rate during drilling, unable to dynamically adjust based on drill bit condition or workpiece material hardness. When the drill bit is dull or the workpiece material is hard, the motor load current increases, easily leading to overload shutdown, motor damage, or drill bit jamming. This not only increases maintenance costs but also delays project timelines. Existing magnetic drills lack effective load detection and speed adjustment mechanisms, making it difficult to balance efficiency and equipment protection. Summary of the Invention

[0003] The purpose of this application is to provide a magnetic drill with fully automatic feed speed control, which solves the problem that existing magnetic drills lack effective load detection and speed adjustment mechanisms, making it difficult to balance efficiency and equipment protection.

[0004] To achieve the above objectives, the technical solution adopted in this application is: a magnetic drill with fully automatic feed speed control, comprising:

[0005] Electromagnetic adsorption base, used to fix the workpiece surface;

[0006] A fixing frame is fixedly connected to the electromagnetic adsorption base;

[0007] A sliding mechanism is slidably connected to the fixed frame;

[0008] A drilling motor is fixedly connected to the sliding mechanism;

[0009] An automatic feed mechanism is connected to the fixed frame and is connected to the sliding mechanism. The automatic feed mechanism dynamically adjusts the feed speed by detecting the real-time load current of the drilling motor.

[0010] Preferably, the automatic feed mechanism includes:

[0011] A stepper motor is mounted on the fixed frame. A drive shaft is connected to the output shaft of the stepper motor via a coupling. The drive shaft has a threaded structure. The stepper motor is electrically connected to a stepper motor driver chip, which is mounted on the main control board. The stepper motor driver chip receives current control signals from the control system (usually the main control board) and converts these current signals into signals that can drive the stepper motor to run, thereby controlling the speed of the stepper motor.

[0012] A lifting shaft is rotatably connected to the fixed frame, and lifting teeth are installed on the lifting shaft, which mesh with the threaded structure.

[0013] A drive gear is mounted on the lifting shaft and is connected to the sliding mechanism.

[0014] Preferably, when the load current of the drilling motor increases to a preset threshold, the stepper motor will automatically slow down the feed speed to protect the drilling motor from overload shutdown and extend the service life of the drill bit.

[0015] Preferably, when the load current of the drilling motor exceeds 8A, the stepper motor driver chip receives a current control signal from the control system (usually the main control board), converts the current signal into a signal that can drive the stepper motor to run, and automatically reduces the feed speed of the stepper motor to 60% of the normal speed.

[0016] Preferably, the sliding mechanism includes:

[0017] A sliding member, wherein the sliding member is provided with a first locking part and a second locking part, both the first locking part and the second locking part are slidably locked onto the fixed frame;

[0018] A rack is fixedly connected to the sliding member, and the rack meshes with the drive teeth.

[0019] Preferably, two guide members are fixedly connected to the fixing frame, and each guide member is provided with a guide groove. The guide groove extends along the length direction of the guide member, and the first snap-fit ​​part and the second snap-fit ​​part are slidably connected to the two guide grooves respectively.

[0020] Preferably, a spare lifting handle is fixedly connected to the lifting shaft.

[0021] Preferably, the mounting bracket is also provided with a handle.

[0022] The advantages of the magnetic drill with fully automatic feed speed control provided in this application are as follows:

[0023] This application discloses a magnetic drill with fully automatic feed speed control. Compared with existing technologies, this application uses an electromagnetic adsorption base for fixing to the workpiece surface; a fixed frame fixedly connected to the electromagnetic adsorption base; a sliding mechanism slidably connected to the fixed frame; a drilling motor fixedly connected to the sliding mechanism; and an automatic feed mechanism connected to the fixed frame and the sliding mechanism. The automatic feed mechanism dynamically adjusts the feed speed based on real-time load current detection of the drilling motor. This achieves the following: 1. Automatically adjusting the feed speed through load detection to avoid drilling motor overload and drill bit damage, extending equipment life; 2. Reducing downtime, minimizing manual intervention and material waste, and significantly improving work efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A three-dimensional structural diagram of a magnetic drill with fully automatic feed speed control is provided for an embodiment of this application;

[0026] Figure 2 A schematic diagram of the internal structure of a magnetic drill with fully automatic feed speed control provided for an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the stepper motor drive chip circuit structure for a magnetic drill with fully automatic feed speed control, provided as an embodiment of this application.

[0028] The following are the labeling elements in the figure:

[0029] 1. Electromagnetic adsorption base; 2. Fixing frame; 201. Guide component; 202. Guide groove; 3. Drilling motor;

[0030] 4. Automatic feed mechanism; 401. Stepper motor; 402. Drive shaft; 403. Lifting shaft; 404. Lifting gear; 405. Drive gear; 5. Sliding mechanism; 501. Sliding component; 502. First locking part; 503. Second locking part; 504. Rack; 6. Handle; 7. Spare lifting handle. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] Please refer to the following: Figures 1 to 3 The present application will now describe a magnetic drill with fully automatic feed speed control according to an embodiment of the present application.

[0036] The magnetic drill with fully automatic feed speed control includes: an electromagnetic adsorption base 1, a fixing frame 2, a sliding mechanism 5, a drilling motor 3, and an automatic feed mechanism 4.

[0037] Specifically, the electromagnetic adsorption base 1 includes a base on which an electromagnet is mounted. The electromagnet is connected to a power source and a control switch via a control circuit. When the control circuit is powered on, current flows through the coil of the electromagnet, generating a magnetic field that magnetizes the iron core, thus producing a magnetic force. This magnetic force is sufficient to adsorb metal objects onto the surface of the workpiece, such as iron plates, low-carbon steel (e.g., Q235, A3 steel), and soft magnetic alloy steel. When the control circuit is powered off, the coil of the electromagnet loses current, the magnetic field disappears, and the magnetism of the iron core also disappears. At this time, the electromagnetic adsorption base 1 will release the adsorbed metal object. The electromagnetic adsorption base 1 is used to fix the workpiece surface.

[0038] The fixing frame 2 is bolted to the electromagnetic adsorption base 1. The fixing frame 2 is bolted to two guide members 201, each with a guide groove 202 extending along its length, with the openings of the two guide grooves facing each other. The sliding mechanism 5 is slidably connected to the fixing frame 2. Specifically, the sliding mechanism 5 includes: a sliding member 501, which has a first engaging portion 502 and a second engaging portion 503, slidably connected to the guide grooves 202; and a rack 504, which is bolted to the sliding member 501. The drilling motor 3 is bolted to the sliding member 501. A drill bit is fixedly connected to the output shaft of the drilling motor 3. The drilling motor 3, the drill bit, and their connection relationships are existing technology and will not be described in detail here. The mounting bracket 2 is also equipped with a handle 6 to facilitate the operator in carrying the magnetic drill.

[0039] An automatic feed mechanism 4 is connected to the fixed frame 2 and is connected to the sliding mechanism 5. The automatic feed mechanism 4 dynamically adjusts the feed speed by detecting the real-time load current of the drilling motor 3.

[0040] Specifically, the automatic feed mechanism 4 includes: a stepper motor 401, which is mounted on the fixed frame 2. A drive shaft 402 is connected to the output shaft of the stepper motor 401 via a coupling. The drive shaft 402 has a threaded structure. The stepper motor 401 is electrically connected to a stepper motor driver chip, which is mounted on the main control board. The stepper motor driver chip receives current control signals from the control system (usually the main control board) and converts these current signals into signals that can drive the feed mechanism. The signal that drives the stepper motor 401 is used to control the speed of the stepper motor 401, thereby controlling the feed speed; the lifting shaft 403 is rotatably connected to the fixed frame 2 via bearings, and a lifting gear 404 is mounted on the lifting shaft 403 via a key, the lifting gear 404 meshing with the threaded structure; the drive gear 405 is mounted on the lifting shaft 403 via a key, and the drive gear 405 meshing with the rack 504; a spare lifting handle 7 is fixedly connected to one end of the lifting shaft 403.

[0041] The stepper motor driver chip is a DRV8434S chip (U1). During installation, the DRV8434S chip (U1) is usually fixed on the main control board circuit board by means of socket or soldering, and together with other components (such as resistors, capacitors, connectors) it forms a complete motor drive circuit.

[0042] Please refer to Figure 3 The following is a detailed introduction to the circuit of the DRV8434S chip (U1):

[0043] Power supply capacitors: C1 (470uF / 35V), C33 (10uF / 35V), C34 (10uF / 35V), C35 (10uF / 35V), C2 (220nF): These capacitors are connected between the +24V power supply and ground for power filtering, ensuring a stable voltage input to the DRV8434S chip. C6 (10nF): This capacitor is also connected between the +24V power supply and ground, close to the DRV8434S chip, for power filtering. C4 (22nF), C3 (100nF): These capacitors are used for filtering the 3.3V power supply, ensuring a stable digital power supply for the chip. C7 (470nF): This capacitor is used for further filtering of the 3.3V power supply. Connector (J1): This is a 4-pin connector for external signal input, including step and direction signals (STEP, DIR), and serial communication signals (SDI, SCLK). DRV8434S Chip (U1): This is the core driver chip responsible for controlling the motor. It connects to external components through multiple pins: VM and PGND: connect to the motor power supply and ground. VCP: connect to the +24V power supply, powering the high-voltage section inside the chip. AOUT1, AOUT2, BOUT1, BOUT2: output pins, connecting to the stepper motor 401 windings to provide drive signals. nSLEEP, ENBLE: control pins used to enable and disable the chip. STEP, DIR: step and direction control pins, connecting to the main control board. SDI, SCLK, SDO, NSCS: serial communication pins used to configure and read the chip status. nFAULT, DVDD: fault indication pins and chip digital power supply pins. Resistors: R1, R2: these resistors may be used for pull-up or pull-down to ensure the stability of the control signals. R7 (10K), R9: these resistors are used for voltage division or pull-up to ensure that the chip pins have a defined level in the default state. The overall function of this circuit is to provide drive signals for the stepper motor 401. The DRV8434S chip receives current signals from the main control board and generates corresponding drive signals, which drive the stepper motor 401 through output pins (AOUT1, AOUT2, BOUT1, BOUT2). Power supply filter capacitors ensure stable input voltage and reduce the impact of power supply noise on the drive signals. Serial communication pins allow external controllers to configure chip parameters and read fault status.

[0044] When the load current of the drilling motor 3 increases to a preset threshold (8A), the stepper motor 401 automatically slows down its feed speed to protect the drilling motor 3 from overload shutdown and extend the life of the drill bit. Specifically, the circuit detects this change when the load current of the drilling motor 3 increases due to a hard workpiece or a dull drill bit. When the load current increases to 8A, one input terminal of the automatic drilling machine feed protection control circuit (marked as STEP, which is mainly used to detect the current of the drilling motor 3) sends a detection signal to the stepper motor driver chip. The stepper motor driver chip transmits signals to the stepper motor 401 through the stepper motor 401 terminal J1 and its output interfaces (AOUT1, AOUT2, BOUT2, BOUT1), slowing it down to 60% of the normal feed speed, thereby regulating and controlling the feed speed of the stepper motor 401. After the load returns to normal, the system automatically restores the original feed speed, achieving dynamic protection.

[0045] Principle: In use, the device is first fixed to the target workpiece via the electromagnetic adsorption base 1. Then, the drilling motor 3 and the stepper motor 401 are started. The stepper motor 401 drives the lifting gear 404 to rotate via the drive shaft 402, thereby driving the lifting shaft 403 fixed to the lifting gear 404 and the drive gear 405 fixedly connected to the lifting shaft 403 to rotate. Since the drive gear 405 meshes with the rack 504 and the rack 504 is fixed to the sliding member 501, the sliding member 501 slides along the guide groove 202, thereby allowing the drilling motor 3 fixed to the sliding member 501 to drill into the target workpiece. When the drill bit encounters a hard workpiece or the drill bit is not sharp, the drilling motor 3 can drill into the target workpiece. When the load current of the drilling motor 3 increases to a preset threshold (8A), the stepper motor driver chip circuit will detect this change. One input terminal of the stepper motor driver chip (marked as STEP, STEP is mainly used to detect the current of the drilling motor 3) will send a detection signal to the stepper motor driver chip. The stepper motor driver chip transmits signals to the stepper motor 401 through the stepper motor 401 terminal J1 and its output interfaces (AOUT1, AOUT2, BOUT2, BOUT1), causing it to slow down to 60% of the normal feed speed. After the load returns to normal, the system automatically restores the original feed speed, realizing dynamic protection.

[0046] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A magnetic base drill having full automatic feed speed control, characterized by, The utility model relates to a kind of automatic drilling machine, including: Electromagnetic adsorption base for fixing on the surface of workpiece; Fixed frame, fixedly connected to the electromagnetic adsorption base; Sliding mechanism, slidingly connected to the fixed frame; Drilling motor, fixedly connected to the sliding mechanism; Automatic feed mechanism, connected to the fixed frame, and the automatic feed mechanism is connected with the sliding mechanism, and the automatic feed mechanism detects dynamic adjustment feed speed in real time by load current of the drilling motor.

2. A magnetic base drill with full automatic feed speed control as claimed in claim 1, characterized in that: The automatic feed mechanism includes: Stepping motor, installed on the fixed frame, a driving shaft is connected to the output shaft of the stepping motor by coupling, the driving shaft is provided with screw structure, the stepping motor is electrically connected to stepping motor drive chip, the stepping motor drive chip is installed on main control panel, the stepping motor drive chip is used to receive current control signal from control system, and the current signal is converted into signal capable of driving the stepping motor to operate, to control the rotating speed of the stepping motor; Lifting shaft, rotatably connected to the fixed frame, lifting teeth are installed on the lifting shaft, and the lifting teeth are engaged with the screw structure; Driving teeth, installed on the lifting shaft, and the driving teeth are connected with the sliding mechanism.

3. A magnetic base drill with full automatic feed speed control as claimed in claim 2, characterized in that: When the load current of the drilling motor increases to preset threshold, the stepping motor will automatically slow down the feed speed, to protect the drilling motor from overloading and shutdown, and prolong the service life of drill bit.

4. A magnetic base drill with full automatic feed speed control as claimed in claim 3, characterized in that: When the load current of the drilling motor exceeds 8A, the stepping motor drive chip receives current control signal from control system, and the current signal is converted into signal capable of driving the stepping motor to operate, and the feed speed of the stepping motor is automatically reduced to 60% of normal speed.

5. A magnetic base drill having full automatic feed speed control as claimed in claim 4 wherein, The sliding mechanism includes: Sliding member, the sliding member is provided with first clamping portion and second clamping portion, the first clamping portion and the second clamping portion are slidingly clamped on the fixed frame; Rack, fixedly connected to the sliding member, and the rack is engaged with the driving teeth.

6. A magnetic base drill with full automatic feed speed control as claimed in claim 5, characterized in that: The fixed frame is fixedly connected with two guide members, two guide grooves are formed in the guide members, the first clamping portion and the second clamping portion are slidingly connected with the guide grooves respectively.

7. A magnetic base drill having full automatic feed speed control as claimed in claim 2 wherein, The lifting shaft is fixedly connected with a spare lifting handle.

8. A magnetic base drill with full automatic feed speed control as claimed in claim 7, characterized in that: The fixed frame is further provided with a handle.

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