Bench tapping machine

Abstract

The utility model discloses a bench tapping machine, which belongs to the technical field of tapping machines and comprises a shell, an electric hand drill core and a feed reset device, the electric hand drill core comprises a motor, a speed reducer and a chuck which are integrated in an electric hand drill, the chuck is provided with a mounting hole for mounting a screw tap, and the shell is provided with a mechanical speed regulation switch and a first positive and negative rotation switch. The mechanical speed regulation switch and the first positive and negative rotation switch are in signal connection with the motor; the feeding reset device comprises a lifting frame, a stand column and a reset spring, the extending direction of the stand column and the extending direction of the mounting hole are consistent with the tapping direction of the to-be-machined part, the lifting frame is slidably connected with the stand column, and the shell is fixedly connected with the lifting frame and driven by the lifting frame to ascend and descend. The reset spring is arranged between the lifting frame and the fixing component and connected with the lifting frame and the fixing component so as to drive the lifting frame and the shell to reset. The bench tapping machine formed by transforming the electric hand drill can improve the matching performance of small-diameter screw taps below M3, reduce the breakage probability of the screw taps and improve the machining efficiency and the machining stability.

Description

Technical Field

[0001] The utility model relates to the technical field of tapping machines, in particular to a desktop tapping machine. Background Art

[0002] Small-diameter tapping is a common process in production. Large tapping machines are notoriously difficult to use due to their relatively bulky swing arm movement and poor torque overload sensitivity. This makes them poorly suited for taps smaller than M3, increasing the risk of tap breakage during machining. Consequently, manual tapping is often used in production, but this method suffers from low production efficiency, cycle delays, and inconsistent quality.

[0003] Therefore, how to design a desktop tapping machine to improve the compatibility of small-diameter taps below M3, reduce the probability of tap breakage during processing, and improve processing efficiency and processing stability is a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0004] The purpose of the utility model is to provide a desktop tapping machine to address the defects and shortcomings in the existing technology, improve the matching of small diameter taps below M3, reduce the probability of tap breakage during processing, and improve processing efficiency and processing stability.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The utility model provides a desktop tapping machine, comprising a housing, a hand-operated electric drill core, and a feed reset device. The hand-operated electric drill core comprises a motor, a reducer, and a chuck integrated in the hand-operated electric drill. The chuck is provided with a mounting hole for mounting a tap. The housing is provided with a mechanical speed regulating switch and a first forward and reverse rotation switch. The mechanical speed regulating switch and the first forward and reverse rotation switch are connected to the motor signal.

[0007] The feed reset device includes a lifting frame, a column and a reset spring. The extension directions of the column and the mounting hole are consistent with the tapping direction of the part to be processed. The lifting frame is slidably connected to the column. The shell is fixedly connected to the lifting frame to be lifted and lowered under the drive of the lifting frame. The reset spring is placed between the lifting frame and the fixed component and connected to the lifting frame and the fixed component to drive the lifting frame and the shell to reset.

[0008] Preferably, the hand drill core also includes a stepless speed regulation circuit and a high-speed tapping circuit arranged in parallel, and a high-speed and low-speed switching switch is provided on the housing or the hand drill core. The stepless speed regulation circuit and the high-speed tapping circuit are connected to the power supply and the motor through the high-speed and low-speed switching switch.

[0009] Preferably, a feed handle is fixedly connected to the lifting frame, and a stepless speed regulation switch and a second forward and reverse switch are installed on the feed handle. The stepless speed regulation switch and the second forward and reverse switch are connected to the motor signal.

[0010] Preferably, the feed handle is provided with a gripping area for easy hand holding, the stepless speed regulation switch is installed in the gripping area, and the second forward and reverse switch is arranged on the stepless speed regulation switch or the feed handle.

[0011] Preferably, the high-speed tapping circuit includes a relay and a micro switch, the micro switch includes a first micro switch for controlling the forward / reverse rotation of the tap and a second micro switch for controlling the reverse / forward rotation of the tap, the relay includes a first relay electrically connected to the first micro switch and a second relay electrically connected to the second micro switch, the positive pole of the motor is connected to the moving contact of one of the relays, and the negative pole of the motor is connected to the moving contact of the other relay, the normally closed contact of the first relay, the normally closed contact of the second relay is connected to the positive pole / negative pole of the power supply, and the normally open contact of the first relay, the normally open contact of the second relay is connected to the negative pole / positive pole of the power supply, so as to form three circuit states: forward connection, reverse connection and neutral.

[0012] Preferably, a first platform whose position can be fixed is provided on the upper part of the lifting frame, and a second platform whose position can be fixed is provided on the lower part of the lifting frame. A limiting rod is provided between the first platform and the second platform, and the return spring is sleeved on the limiting rod, and the end of the return spring away from the lifting frame is connected to the second platform.

[0013] Preferably, the first platform and the second platform are both slidably connected to the column, and the first platform and the second platform are both provided with a locking structure for fixing their positions;

[0014] The first platform, the second platform and the lifting frame are all connected to the column through a linear bearing structure.

[0015] Preferably, the desktop tapping machine also includes a power supply component, a storage component and a measuring component. The power supply component includes a power supply and a battery arranged in parallel. The power supply and the battery are connected through a power switching switch. The battery compartment for installing the battery is provided with a detection component for detecting whether a battery is installed in the battery compartment. The detection component is connected to the power switching switch signal.

[0016] Preferably, the storage assembly includes a storage box for storing taps, and the storage box has an openable and closable storage cover; the storage box is located at the top end of the column and is fixedly connected to the column.

[0017] Preferably, the measuring component includes a digital dial indicator with a buzzer limit alarm function, and the digital dial indicator is installed on the lifting frame and can abut against the part to be processed.

[0018] Compared with the prior art, the utility model has achieved the following technical effects:

[0019] 1. The utility model installs the remaining core (i.e., the electric drill core) after the shell of the electric drill is removed into a redesigned shell, and provides a feed reset device. The redesigned shell is fixedly connected to the feed reset device, so that the feed reset device drives the shell and the electric drill core installed in the shell to move up and down, thereby tapping parts. Compared with the processing method of manual tapping with a hand drill, the tapping efficiency and processing stability are improved; in addition, since the desktop tapping machine is modified from the core of the electric drill, it has better matching performance for small-diameter taps below M3, and the tap is less likely to break during processing, which reduces production costs and further improves processing efficiency.

[0020] Other technical solutions of the utility model have achieved the following technical effects compared with the prior art:

[0021] 2. The utility model realizes three different tapping modes by setting a reducer, a stepless speed regulation circuit and a high-speed tapping circuit, so that the desktop tapping machine can be adapted to the tapping processing of various soft and hard materials, suitable for different working conditions and different usage environments, and improves the applicability of the desktop tapping machine; and when using high-speed tapping, it can reduce the fatigue of the user's hands, increase the tapping speed, and is conducive to improving the production efficiency during mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figures 1 to 3 Schematic diagram of the axial side structure of the desktop tapping machine at different angles;

[0024] Figure 4 This is a schematic diagram of the circuit structure of a desktop tapping machine.

[0025] Among them, 1. Storage cover; 2. Storage box; 3. Second forward and reverse switch; 4. Feed handle; 5. Housing; 6. Hand drill core; 7. Table leveling structure; 8. Base; 9. Column; 10. Second platform; 11. Return spring; 12. Lifting frame; 13. Limit rod; 14. First platform; 15. Locking structure; 16. Mechanical speed control switch; 17. Digital dial indicator; 18. Battery compartment; 19. Mounting hole; 20. Chuck; 21. Stepless speed control switch; 22. High and low speed switching switch; 23. Switching power supply; 24. Motor; 25. Second relay; 26. Second micro switch; 27. First micro switch; 28. First relay; 29. ​​Battery; 30. Power switching switch. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] like Figures 1 to 3 As shown, the utility model provides a desktop tapping machine, including a housing 5, a hand-held electric drill core 6 and a feed reset device. The hand-held electric drill core 6 includes a motor 24, a reducer and a chuck 20 integrated in the hand-held electric drill. The chuck 20 is provided with a mounting hole 19 for mounting a tap. A mechanical speed control switch 16 and a first forward and reverse switch (not shown in the figure) are provided on the housing 5. The mechanical speed control switch 16 and the first forward and reverse switch are respectively connected to the motor 24 signal; in some embodiments, the reducer is a two-speed mechanical reducer, and the corresponding mechanical speed control switch 16 has two gears: fast and low speed.

[0029] The feed reset device includes a lifting frame 12, a column 9 and a reset spring 11. The extension directions of the column 9 and the mounting hole 19 are consistent with the tapping direction of the part to be processed. The lifting frame 12 is slidingly connected to the column 9. The lifting frame 12 is fixedly connected to the outer shell 5 and drives the outer shell 5 to rise and fall. The reset spring 11 is placed between the lifting frame 12 and the fixed component and is connected to the lifting frame 12 and the fixed component to drive the lifting frame 12 and the outer shell 5 to reset.

[0030] When using a hand drill for manual tapping, the processing efficiency is slow and the processing quality is unstable. For this reason, the utility model removes the shell of the hand drill, installs the movement of the hand drill in a redesigned shell 5, and installs the speed control switch and forward and reverse switch of the hand drill on the new shell 5 to form a mechanical speed control switch 16 and a first forward and reverse switch, and provides a lifting frame 12 that can be raised and lowered, and fixes the new shell 5 on the lifting frame 12 to drive the tap to feed through the lifting frame 12, thereby improving the tapping efficiency and the stability of the processing quality; because it is modified from a hand drill, it has better matching performance for small diameter taps below M3 than large tapping machines, so as to reduce the probability of tap breakage during processing and reduce production costs, and the technology is relatively mature and not prone to failure.

[0031] The hand drill core 6 also includes a stepless speed regulation circuit and a high-speed tapping circuit arranged in parallel. A high-speed / low-speed switch 22 is provided on the housing 5 or the hand drill core 6. The stepless speed regulation circuit and the high-speed tapping circuit are connected to the power supply and the motor 24 via the high-speed / low-speed switch 22. The lifting frame 12 is fixedly connected to the feed handle 4, on which the stepless speed regulation switch 21 and the second forward / reverse switch 3 are mounted. The stepless speed regulation switch 21 and the second forward / reverse switch 3 are connected to the motor 24 signal. By pressing the stepless speed control switch 21, the voltage of the motor 24 can be changed between 5V and 12V, thereby achieving the technical effect of freely controlling the speed of the motor 24, more accurately controlling the cutting speed, and safely processing the threaded hole. Therefore, during normal tapping, stepless speed control is often used for tapping. Threading refers to the tapping process of removing foreign matter from the threaded hole caused by surface painting or other reasons when the part already has a threaded hole. If the threading process is performed using the stepless speed control method, the tapping time is long, the tapping efficiency is low, and the hand is easily fatigued. For this reason, the utility model has designed a high-speed tapping circuit. When threading is required, the high-speed and low-speed switching switch 22 is operated to enable the high-speed tapping circuit to power the motor 24. At this time, the motor 24 is directly supplied with 12V voltage, and the motor 24 rotates at high speed, thereby shortening the tapping time and improving the tapping efficiency. In one embodiment, the hand drill core 6 also has a fixed torque limiter to prevent mechanical overload and slippage.

[0032] Furthermore, the feed handle 4 is provided with a gripping area for easy hand holding, the stepless speed control switch 21 is installed in the gripping area, and the second forward and reverse switch 3 is set on the stepless speed control switch 21 or the feed handle 4. If it is set on the stepless speed control switch 21, the second forward and reverse switch 3 needs to be set outside the hand pressing area of ​​the stepless speed control switch 21. In one embodiment, the second forward and reverse switch 3 is set on the top of the stepless speed control switch 21.

[0033] The high-speed tapping circuit includes relays and micro switches. The micro switches include a first micro switch 27 for controlling the forward / reverse rotation of the tap and a second micro switch 26 for controlling the reverse / forward rotation of the tap. The relay includes a first relay 28 electrically connected to the first micro switch 27 and a second relay 25 electrically connected to the second micro switch 26. The positive pole of the motor 24 is connected to the moving contact of one of the relays, and the negative pole of the motor 24 is connected to the moving contact of the other relay. The normally closed contact of the first relay 28 and the normally closed contact of the second relay 25 are connected to the positive / negative pole of the power supply, and the normally open contact of the first relay 28 and the normally open contact of the second relay 25 are connected to the negative / positive pole of the power supply to form three circuit states: forward connection, reverse connection, and neutral.

[0034] Forward connection means that the current enters from the positive pole and flows out from the negative pole of the motor 24, reverse connection means that the current enters from the negative pole and flows out from the positive pole of the motor 24, and neutral means that the motor 24 is not connected to the power supply and is in a non-working state. When not in use, the first microswitch 27 and the second microswitch 26 are not connected. At this time, the moving contacts of the first relay 28 and the second relay 25 are in contact with the normally closed contact or the normally open contact, the negative circuit or the positive circuit is completely disconnected, there is no current loop, and the motor 24 does not rotate; when the first microswitch 27 is pressed and the second microswitch 26 is not pressed, or when the second microswitch 26 is pressed and the first microswitch 27 is not pressed, the moving contact of one relay is in contact with the normally open contact, and the moving contact of the other relay is in contact with the normally closed contact, forming a current loop, and the motor 24 rotates forward or reverse; when the first microswitch 27 and the second microswitch 26 are pressed at the same time, the moving contacts of the first relay 28 and the second relay 25 are in contact with the normally open contact or the normally closed contact, the positive circuit or the negative circuit is completely disconnected, there is no current loop, and the motor 24 does not rotate. This arrangement not only enables forward and reverse rotation of the motor 24, but also prevents damage to the motor 24 due to misoperation resulting from simultaneously pressing the first microswitch 27 and the second microswitch 26. When powered by a stepless speed regulation circuit or a reducer, the first microswitch 27 and the second microswitch 26 are in an inactive state, thereby avoiding interference. By providing a reducer, a stepless speed regulation circuit, and a high-speed tapping circuit, the present utility model provides three different tapping speed modes: two-speed mechanical speed regulation, stepless speed regulation, and high speed. This allows for adaptation to different working conditions and usage environments, broadening its scope of application.

[0035] A first platform 14, which can be fixed in position, is provided on the upper portion of the lifting frame 12, and a second platform 10, which can be fixed in position, is provided on the lower portion of the lifting frame 12. A limiting rod 13 is provided between the first platform 14 and the second platform 10. A return spring 11 is mounted on the limiting rod 13, and the end of the return spring 11 away from the lifting frame 12 is connected to the second platform 10. Mounting the return spring 11 on the limiting rod 13 limits the travel path of the return spring 11, ensuring that the tap mounted on the chuck 20 always aligns with the direction of the thread to be tapped during the downward movement of the lifting frame 12, thereby improving the tapping quality.

[0036] In some embodiments, the first platform 14 and the second platform 10 are both slidably connected to the column 9, and each is provided with a locking structure 15 for securing the first and second platforms 14, 10 in position. Before tapping, the locking structure 15 is released, and the positions of the first and second platforms 14, 10 are adjusted according to the height of the workpiece to adjust the tap's stroke. The first and second platforms 14, 10, and the lifting frame 12 are all connected to the column 9 via linear bearings, which reduces friction, improves operational feel, and reduces any sense of stagnation when the return spring 11 is reset.

[0037] The desktop tapping machine of the present invention also includes a power supply component, a storage component and a measuring component. The power supply component includes a power supply and a battery 29 arranged in parallel. The power supply and the battery 29 are connected via a power switching switch 30. The battery compartment 18 for installing the battery 29 is provided with a detection component for detecting whether the battery 29 is installed in the battery compartment 18. The detection component is connected to the power switching switch 30 signal. If the detection component detects that the battery 29 is not installed in the battery compartment 18, the power switching switch 30 automatically switches to connect to the power supply. If it detects that the battery 29 is installed in the battery compartment 18, the power switching switch 30 automatically switches to connect to the battery 29. In some embodiments, the desktop tapping machine is connected to a 220V mains power supply via a switching power supply 23. By setting two power supply modes, namely the mains power supply and the battery 29, it can not only meet the power demand of the desktop tapping machine for daily tapping, but also can perform tapping processing when the power is off or there is no mains power supply, further improving the scope of application of the desktop tapping machine.

[0038] The storage assembly includes a storage box 2 for storing commonly used taps, and the storage box 2 has an openable and closable storage cover 1; the storage box 2 is located at the top of the column 9 and is fixedly connected to the column 9, so that the storage box 2 can be used to store commonly used taps and serve as a handle to facilitate the movement of the desktop tapping machine.

[0039] The measuring assembly includes a digital dial indicator 17 with a buzzer limit alarm function. The digital dial indicator 17 is mounted on the lifting frame 12 and can abut against the part to be processed. Before processing, the tap is placed on the upper end of the part to be processed, and the digital dial indicator 17 is reset to zero. When the processing depth is reached, the digital dial indicator 17 buzzes and alarms. In mass production, there is no need to observe the dial indicator value every time. It is only necessary to adjust the buzzer alarm for the first piece depth, which simplifies the operation steps and improves processing efficiency. In some embodiments, the base 8 of the desktop tapping machine is also provided with a table leveling structure 7. The extension direction of the column 9 and the mounting hole 19 is perpendicular to the table leveling structure 7, which can meet the higher verticality requirements during tapping and improve the tapping quality.

[0040] When in use, turn on the main power switch and power the electrical components through the mains or battery 29; install the tap on the chuck 20, adjust the processing stroke of the tap according to the height of the workpiece to be processed, adjust the fixed torque of the spindle according to the model of the tap, and position the tap top at the upper end surface of the workpiece to be processed. Clear the digital dial indicator 17, adjust the forward and reverse switch or micro switch, the motor 24 rotates forward, press the feed handle 4 to start processing, and after the processing is completed, adjust the forward and reverse switch or micro switch again, the motor 24 reverses, and the tap reverses and exits. Specifically, if the stepless speed regulation mode is used for tapping, first operate the second forward and reverse switch 3 to make the motor 24 rotate forward, and then hook the index finger on the stepless speed regulation switch 21 while pressing the feed handle 4 to start processing. After the processing is completed, operate the second forward and reverse switch 3 again to make the motor 24 reverse, and the tap reverses and exits; if mechanical two-speed processing is used, first operate the first forward and reverse switch to make the motor 24 rotate forward, after adjusting the gear position, directly press the feed handle 4 to start processing, after the processing is completed, operate the first forward and reverse switch to make the motor 24 reverse, and the tap reverses and exits; if high-speed tapping is used, press the microswitch that controls the forward rotation of the tap, and then directly press the feed handle 4 to start processing. After the processing is completed, put the microswitch that controls the forward rotation of the tap in the non-pressed state, and press the microswitch that controls the reverse rotation of the tap to make the tap reverse and exit.

[0041] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A desktop tapping machine, characterized in that: The hand drill comprises a housing, a hand drill core and a feed reset device. The hand drill core comprises a motor, a reducer and a chuck integrated in the hand drill. The chuck is provided with a mounting hole for mounting a tap. The housing is provided with a mechanical speed control switch and a first forward and reverse switch. The mechanical speed control switch and the first forward and reverse switch are connected to the motor signal. The feed reset device includes a lifting frame, a column and a reset spring. The extension directions of the column and the mounting hole are consistent with the tapping direction of the part to be processed. The lifting frame is slidably connected to the column. The shell is fixedly connected to the lifting frame to be lifted and lowered under the drive of the lifting frame. The reset spring is placed between the lifting frame and the fixed component and connected to the lifting frame and the fixed component to drive the lifting frame and the shell to reset.

2. The desktop tapping machine according to claim 1, characterized in that: The hand drill core also includes a stepless speed regulation circuit and a high-speed tapping circuit arranged in parallel. A high-speed and low-speed switching switch is provided on the housing or the hand drill core. The stepless speed regulation circuit and the high-speed tapping circuit are connected to the power supply and the motor through the high-speed and low-speed switching switch.

3. The desktop tapping machine according to claim 2, characterized in that: A feed handle is fixedly connected to the lifting frame, and a stepless speed regulating switch and a second forward and reverse switch are installed on the feed handle. The stepless speed regulating switch and the second forward and reverse switch are connected to the motor signal.

4. The desktop tapping machine according to claim 3, characterized in that: The feeding handle is provided with a gripping area for easy hand gripping, the stepless speed regulating switch is installed in the gripping area, and the second forward and reverse switch is arranged on the stepless speed regulating switch or the feeding handle.

5. The desktop tapping machine according to claim 2, characterized in that: The high-speed tapping circuit includes relays and micro switches, the micro switches including a first micro switch for controlling forward / reverse rotation of the tap and a second micro switch for controlling reverse / forward rotation of the tap, the relays including a first relay electrically connected to the first micro switch and a second relay electrically connected to the second micro switch, the positive pole of the motor is connected to the moving contact of one of the relays, the negative pole of the motor is connected to the moving contact of the other relay, the normally closed contact of the first relay, the normally closed contact of the second relay is connected to the positive pole / negative pole of the power supply, and the normally open contact of the first relay, the normally open contact of the second relay is connected to the negative pole / positive pole of the power supply, so as to form three circuit states: forward connection, reverse connection, and neutral.

6. The desktop tapping machine according to claim 1, characterized in that: A first platform with a fixed position is provided on the upper part of the lifting frame, and a second platform with a fixed position is provided on the lower part of the lifting frame. A limiting rod is provided between the first platform and the second platform. The return spring is sleeved on the limiting rod, and the end of the return spring away from the lifting frame is connected to the second platform.

7. The desktop tapping machine according to claim 6, characterized in that: The first platform and the second platform are both slidably connected to the column, and the first platform and the second platform are both provided with a locking structure for fixing their positions; The first platform, the second platform and the lifting frame are all connected to the column through a linear bearing structure.

8. The desktop tapping machine according to any one of claims 1 to 7, characterized in that: The desktop tapping machine also includes a power supply component, a storage component and a measuring component. The power supply component includes a power supply and a battery arranged in parallel. The power supply and the battery are connected through a power switching switch. The battery compartment for installing the battery is provided with a detection component for detecting whether a battery is installed in the battery compartment. The detection component is connected to the power switching switch signal.

9. The desktop tapping machine according to claim 8, characterized in that: The storage assembly includes a storage box for storing taps, wherein the storage box has an openable and closable storage cover; the storage box is located at the top end of the column and is fixedly connected to the column.

10. The desktop tapping machine according to claim 8, characterized in that: The measuring component includes a digital dial indicator with a buzzer limit alarm function. The digital dial indicator is installed on the lifting frame and can abut against the part to be processed.

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