CN220739516U - Novel automatic bench drilling machine - Google Patents

Abstract

The novel automatic bench drilling machine comprises an electric drill body, a power module, an electric push rod, a linear bearing, a laser ranging module, a workbench, a clamping mechanism, a force transducer, a drilling moment control circuit and a drilling depth control circuit; the lower ends of the force transducer and the linear bearing are respectively arranged at the upper end of the electric drill body, the lower end of the electric push rod is connected with the upper end of the force transducer, and the upper ends of the electric push rod and the linear bearing are respectively arranged at the rear part of the workbench; the laser ranging module is arranged at the rear side end of the electric drill body; the clamping mechanism is arranged at the front lower end of the workbench, and the power module, the drilling moment control circuit and the drilling depth control circuit are arranged in the electric cabinet and are electrically connected. This novel fixture is mainly fixed the work piece, can temporarily stop the drill bit and descend when the drill bit load is too big, has reduced the probability of the too big damage of motor load, and after work piece drilling degree of depth is enough, the motor input power of automatic stop electric drill body has prevented that the drilling degree of depth is too big.

Description

Novel automatic bench drilling machine

Technical Field

The utility model relates to the technical field of drilling equipment, in particular to a novel automatic bench drilling machine.

Background

A bench electric drill (drilling machine) is a very common processing device, a workpiece to be drilled is clamped on a bench clamp at the lower end of the bench drill by a worker during drilling, and then an operating rod is gradually pressed down by the hand of the worker, so that the drill bit gradually drills the workpiece from top to bottom.

The patent numbers of China are 201110249437.5 and the patent name is an authorized patent of a table electric drill, and the content of the patent is recorded in the patent that the table electric drill can enable a user to place a workpiece placing table at any required position by using a manual rocker arm capable of manually lifting and lowering and a manual locking cross bar for locking the position of the workpiece placing table. As can be seen from a combination of the drawings and the contents of the patent, although the patent can put the workpiece placement table at any desired position, the drilling of the workpiece is facilitated, but the present utility model is limited in structure, and has more or less technical defects as those of other bench drills in the prior art. The method comprises the following steps: in drilling, a worker is required to press the operating rod by hand all the time, so that inconvenience is brought to the operation of the worker. And two,: in drilling, particularly for persons with insufficient experience, when the force of manually pushing the operating rod downwards is excessive, the acting force of the lower end of the drill bit contacting the upper end of the workpiece becomes large, that is to say, the load of the motor of the drilling machine becomes large, and thus, when the load of the motor is excessive for a long time, the service life of the motor is adversely affected. And thirdly,: when a worker drills a workpiece, the worker needs to visually observe the descending distance (observation scale) of the drill bit, so that inconvenience is brought to the worker, and the worker does not observe scales in time due to various reasons and has the probability of overlarge drilling depth. In view of all the above, it is particularly necessary to provide a table motor which can automatically drill holes, prevent excessive load on the motor, and automatically control the depth of the drilled holes.

Disclosure of Invention

The utility model aims to provide the novel automatic bench drill which does not need manual operation of a worker, can automatically control the drill bit to drill downwards, can monitor and control the load of a motor in real time, reduces the probability of overlarge damage of the motor load, can automatically stop working after the drill hole reaches a set depth, brings convenience to a user, ensures the processing quality of parts and overcomes the defects of the conventional bench drill as described in the background due to the limitation of the structure.

The technical scheme adopted for solving the technical problems is as follows:

the novel automatic bench drilling machine comprises an electric drill body, a power module, an electric push rod, a linear bearing, a laser ranging module, a workbench, a clamping mechanism and a force transducer, and is characterized by further comprising a drilling moment control circuit and a drilling depth control circuit; the lower ends of the force transducer and the linear bearing are respectively arranged at the upper end of the electric drill body, the lower end of the electric push rod is connected with the upper end of the force transducer, and the upper ends of the electric push rod and the linear bearing are respectively arranged at the rear part of the workbench; the laser ranging module is arranged at the rear side end of the electric drill body; the clamping mechanism is arranged at the front lower end of the workbench, and the power module, the drilling moment control circuit and the drilling depth control circuit are arranged in the electric cabinet; the power output end of the drilling depth control circuit is electrically connected with the power input end of the motor of the electric drill body, and the power output end of the drilling moment control circuit is electrically connected with the power input end of the electric push rod; and the signal output ends of the force transducer and the laser ranging module are respectively and electrically connected with the signal input ends of the drilling moment control circuit and the drilling depth control circuit.

Further, the clamping mechanism comprises a left chuck, a right chuck, a front guide block, a rear guide block and a screw rod, wherein the front guide block and the rear guide block are respectively provided with a guide groove, the front lower side ends of the left chuck and the right chuck are respectively sleeved in the guide grooves of the front guide block and the rear guide block in a sliding way, the lower ends of the left chuck and the right chuck are respectively provided with a screw hole, and the left end and the middle part of the screw rod are respectively screwed into the screw holes of the lower ends of the left chuck and the right chuck.

Further, the screw threads at the left and right side ends of the screw rod are opposite in rotation direction, screw holes at the lower ends of the left chuck and the right chuck are opposite in rotation direction, the screw holes are respectively consistent with the rotation directions of the left end and the right end of the screw rod, and an operation hand lever is arranged at the right end of the screw rod.

Further, the drilling moment control circuit comprises an electric connection relay, an adjustable resistor, a resistor and an NPN triode, wherein the positive power input end and the positive control power input end of the relay are connected, the negative power input end of the force transducer is connected with one end of the first resistor, the emitter of the NPN triode and the negative control power input end of the relay, the signal output end of the force transducer is connected with one end of the adjustable resistor, the other end of the adjustable resistor is connected with the other end of the first resistor and one end of the second resistor, the other end of the second resistor is connected with the base electrode of the NPN triode, and the collector of the NPN triode is connected with the negative power input end of the relay.

Further, the drilling depth control circuit comprises an electric connection relay, an adjustable resistor, a resistor, an NPN triode and a sounder, wherein one end of the first resistor is connected with an emitter of the NPN triode, one end of the adjustable resistor is connected with the other end of the first resistor, one end of the second resistor is connected with a base electrode of the NPN triode, the other end of the second resistor is connected with a collector electrode of the NPN triode, a negative electrode power supply input end of the relay is connected, and two normally open contact ends of the relay are respectively connected with two power supply input ends of the sounder.

Compared with the prior art, the utility model has the beneficial effects that: (1) In this novel, fixture mainly carries out fixed action to the work piece that needs to bore hole, and drilling moment control circuit can combine force transducer, electric putter, and real-time control drill bit descends to monitor drilling load, can temporarily stop the drill bit and descend when the drill bit load is too big, reduced the too big probability of damaging of motor load. (2) Under the action of a drilling depth detection circuit, a laser ranging module and the like, after the drilling depth of a workpiece is enough, the motor input power supply of the electric drill body is automatically stopped, so that convenience is brought to a user, the drilling depth is prevented from being too large, and the machining quality of parts is ensured.

Drawings

The utility model will be further described with reference to the drawings and examples.

Fig. 1 is a schematic diagram of the overall structure of the present utility model.

Fig. 2 is a circuit diagram of the present utility model.

Detailed Description

The novel automatic bench drilling machine comprises an electric drill body 1, a power module U1, an electric push rod M1, a linear bearing 2, a laser ranging module U3, a workbench 3, a clamping mechanism and a force transducer U2, and also comprises a drilling moment control circuit 4 and a drilling depth control circuit 5; the lower end of the force transducer U2 and the lower end of the shaft lever of the linear bearing 2 are respectively arranged on the front and rear sides of the outer middle part of the upper end of the shell of the electric drill body 1 through bolts, the lower end of the movable column of the electric push rod M1 is connected with the upper end of the stress surface of the force transducer U2 through bolts, and the upper end of the cylinder body of the electric push rod M1 and the upper end of the shaft sleeve of the linear bearing are respectively arranged on the front and rear sides of the upper end of the rear middle part of the workbench 1 through bolts; the laser ranging module U3 is arranged outside the rear right side end of the shell of the electric drill body 1 through a bolt, and the detecting head is positioned at the upper part; the fixture is installed on the front lower end middle part of the workbench, the power module U1, the drilling moment control circuit 4 and the drilling depth control circuit 5 are installed on a circuit board in the electric cabinet 6, and the electric cabinet 6 is installed on the middle part of the right side of the rear front end of the workbench through bolts.

As shown in fig. 1 and 2, the clamping mechanism comprises a left clamping head 71, a right clamping head 72 (respectively arranged on the middle part of the front lower end of the workbench), a front guide block 73, a rear guide block 74 and a screw rod 75, wherein a guide groove 76 is respectively and transversely arranged in the middle parts of the front guide block 73 and the rear guide block 74, a guide plate 77 is respectively welded at the lower parts of the front side and the rear side of the left clamping head 71 and the right clamping head 72, the guide plates 77 at the front side and the rear side of the left clamping head 71 and the right clamping head 72 are respectively and slidably sleeved in the guide grooves 76 of the front guide block 73 and the rear guide block 74, screw holes 78 are respectively formed in the middle parts of the lower ends of the left clamping head 71 and the right clamping head 72, and the left end and the middle part of the screw rod 75 are respectively screwed into the screw holes at the lower ends of the left clamping head 71 and the right clamping head 72. The screw threads at the left and right sides of the middle part of the screw rod 75 are opposite in rotation direction, the screw threads at the lower ends of the left chuck 71 and the right chuck 72 are opposite in rotation direction, the screw threads are respectively consistent with the rotation directions of the left end and the right end of the screw rod 75, the height of the guide plate 77 is slightly smaller than the height of the guide groove 76 by 0.2 mm, the right end of the screw rod 75 is provided with a vertical through hole, and an operation hand lever 79 is inserted into the through hole. The drilling moment control circuit comprises a power switch S, a relay J1, adjustable resistors R1, resistors R2 and R3 and an NPN triode Q1 which are connected through circuit board wiring, wherein one power input end 1 pin of the power switch S is connected with the positive power input end and the positive control power input end of the relay J1, a first power output end 3 pin of the power switch S is connected with the positive power input end 1 pin of a force transducer U2, a first second power output end 4 pin of the power switch S is connected with the negative power input end 2 pin of the force transducer U2, one end of the first resistor R2, an emitter of the NPN triode Q1 and the negative control power input end of the relay J1, one end of a signal output end 3 pin of the force transducer U2 is connected with one end of the adjustable resistor R1, the other end of the adjustable resistor R1 is connected with the other end of the first resistor R2, one end of the second resistor R3 is connected with the base of the NPN triode Q1, and the negative power input end of the relay J1 is connected. The drilling depth control circuit comprises a relay J2, an adjustable resistor R4, resistors R5 and R6, an NPN triode Q2 and a sounder BK which are connected through circuit board wiring, wherein one end of the first resistor R5 is connected with an emitter of the NPN triode Q2, one end of the adjustable resistor R4 is connected with the other end of the first resistor R5, one end of the second resistor R6 is connected with a base of the NPN triode Q2, the other end of the second resistor R6 is connected with a collector of the NPN triode Q2 and a negative power input end of the relay J2, and two normally open contact ends of the relay J2 and two power input ends of the sounder BK are respectively connected. The power switch S and the adjusting handles of the adjustable resistors R1 and R4 are respectively positioned outside the three openings at the front end of the electric cabinet, and the side ends of the handles of the ring adjustable resistors are marked with continuous numbers which respectively represent drilling moment and drilling depth.

As shown in fig. 1 and 2, the power input terminals 1 and 2 pins of the power module U1, the two control power input terminals of the relay J2 and the two poles of the ac 220V power supply are connected by wires respectively. Two normally closed contact ends of the relay J2 are connected with two ends of a power input end of a motor M2 of the electric drill body through wires respectively. The power output ends 3 and 4 pins of the power module U1 are connected with the positive power input end of the power input end relay J2 of the drilling depth control circuit, the emitter of the NPN triode Q2, the positive power input end of the power input end relay J1 of the drilling moment control circuit, the emitter of the NPN triode Q1, the power input ends 1 and 2 pins of the laser ranging module U3 and the power input end 2 pin of the force transducer U2 through wires. The power supply output end of the drilling moment control circuit is connected with the 5 pins and the 6 pins of the power switch S through wires, and the two normally closed contact ends of the relay J1 are respectively connected with the positive and negative power supply input ends of the electric push rod M1 through wires. The signal output end 3 pin of the force transducer U2 is connected with one end of an adjustable resistor R1 of the drilling moment control circuit through a wire. And the other end of the resistor R4 is connected with the pin 3 of the signal output end of the laser ranging module U3 through a wire. The power module U1 is a finished product of a power module from alternating current 220V to direct current 12V; the relays J1 and J2 are direct-current 12V relays; the resistance values of the resistors R2, R3, R5 and R6 are respectively 8K, 100K, 8K and 100K; the resistance values of the adjustable resistors R1 and R2 are 470K (the resistance values of the adjustable resistors R1 and R4 are respectively adjusted to 47.k and 32.3K in the embodiment), in the embodiment, when the resistance value of the adjustable resistor R1 or R4 is adjusted to be relatively large, the partial pressure of the adjustable resistor R1 or R4 is large, so that when the stress surface of the load cell U2 is large or the down heights of the drill bit and the laser ranging module are relatively large, the NPN triode Q1 or Q2 is conducted, that is, the drilling moment or the drilling depth of the novel drilling device is set to be relatively large and relatively deep; the staff adjusts the resistance value of the adjustable resistor R1 or R4 to be relatively small, and the partial pressure is small, so that when the stress on the stress sensor U2 is small or the descending heights of the drill bit and the laser ranging module are relatively small, the NPN triode Q1 or Q2 is conducted, namely the novel drilling moment and the novel drilling depth are relatively small and relatively shallow. The sounder BK is the active continuous acoustic sounder finished product of model FM 220V. Model Q1 and model Q2 of NPN triode are 8050; load cell U2 is a finished weight sensor of model HYMH-018 having two power inputs and one signal output. The laser ranging module U3 is a finished product of the laser ranging sensor with the model GX70-3A, and is provided with two power input ends and one signal output end.

In fig. 1 and 2, after an ac 220V power enters the power input end of the power module U1, the power output end of the power module U1 outputs a stable dc 12V power, and the dc 12V power enters the drilling depth control circuit, the drilling moment control circuit, the laser ranging module U3 and the power input end of the load cell U2, and the circuits and the modules are electrically operated. When a clamping member is required before drilling or when a workpiece is required to be taken out after drilling is completed (the workpiece is placed between the left chuck 71 and the right chuck 72 before drilling), a worker rotates the operating lever 79 clockwise or counterclockwise, and thus the screw 75 rotates clockwise or counterclockwise. When the screw rod 75 rotates clockwise, the left clamping head 71 and the right clamping head 72 move inwards, so that a workpiece can be clamped between the left clamping head and the right clamping head, and subsequent drilling work is facilitated. When the screw 75 rotates counterclockwise, the left chuck 71 and the right chuck 72 move outward, and the distance between them is increased, so that the drilled workpiece can be taken out from between the left and right chucks, and the drilling work is completed. When a worker pulls out the handle of the power switch S to dial left or right, the pins 1 and 2, the pins 3 and 4 or the pins 5 and 6 of the power switch S are respectively communicated, so that the power input ends of the negative pole and the positive pole or the positive pole of the electric push rod M1 are respectively powered (the power input ends enter the negative pole and the positive pole of the electric push rod M1 through the two normally closed contact ends of the relay J1). After the positive and negative electrode power supply input ends of the electric push rod M1 are powered on, the movable column of the electric push rod M1 drives the electric drill body 1 to ascend (guide by a linear bearing), and the distance between the lower end of the drill and the upper end of the workpiece is kept, so that drilling operation is completed. After the negative and positive electrode power supply input ends of the electric push rod M1 are powered on, the movable column (the clock speed per second is about 0.6 millimeter) of the electric push rod M1 pushes the electric drill body 1 to gradually descend, and the drill bit gradually drills the workpiece from top to bottom.

In fig. 1 and 2, while the pins 1 and 2, 3 and 4 of the power switch S are respectively communicated, the force transducer U2 is electrically operated, when the downward acting force of the drill bit is relatively small (for example, smaller than 5 KG), the reverse acting force of the workpiece on the drill bit acts on the stress surface of the force transducer U2, the voltage signal output by the pin 3 of the force transducer U2 is relatively low, the 12V power supply is divided by the adjustable resistor R1 (the different resistance values are adjusted by the staff in advance, the specific drilling moment threshold can be set), the resistor R2 is divided, the voltage and the current of the resistor R3 are reduced and limited, the base electrode of the NPN triode Q1 is lower than 0.7V, the NPN triode Q1 is not conducted, the relay J1 is continuously in power failure control, the power input end and the normally closed contact end are closed, the movable column of the electric putter M1 continuously pushes the drill bit to descend, and the drilling is normally performed. When the downward acting force of the drill bit drilling is relatively large (for example, larger than 5 KG), the reverse acting force of the workpiece on the drill bit acts on the stress surface of the force transducer U2 relatively large, the voltage signal output by the 3 pin of the force transducer U2 is relatively high, the 12V power supply is divided by the adjustable resistor R1 and the resistor R2, the voltage of the resistor R3 is reduced, the current limiting enters the base electrode of the NPN triode Q1 to be higher than 0.7V, the NPN triode Q1 can conduct the collector electrode to output low level to enter the negative electrode power supply input end of the relay J1, the relay J1 is electrified to suck the control power supply input end and the normally closed contact end of the relay J1 to open, the electric push rod M1 is temporarily powered off, and the movable column of the electric push rod does not continue pushing the drill bit to move downwards. Subsequently, after the drill bit drills a hole at the current operation position, the force of contacting the workpiece is reduced, so that the voltage signal output by the 3 pin of the force sensor U2 is relatively low again, the relay J1 is powered off again to control the power input end and the normally closed contact end to be closed, and the movable column of the electric push rod M1 continues to push the drill bit to descend again, so that drilling is performed normally again. Through above-mentioned, this novel can monitor drilling load, can temporarily stop the drill bit and descend when the drill bit load is too big, reduced the probability that motor load is too big damaged.

In the drilling shown in fig. 1 and 2, as the height of the electric drill body gradually decreases, the distance between the probe of the laser ranging sensor U3 and the upper end of the workbench gradually increases, and the voltage signal output from the 3 pin to the adjustable resistor R4 gradually increases. When the depth of the drill bit is not equal to the depth set by a worker through the adjustable resistor R4 (the resistance value of the adjustable resistor R4 is relatively large at the moment, the voltage division is large), the voltage signal output by the 3 pin of the laser ranging sensor U3 is reduced in voltage and limited by the resistor R6 through the adjustable resistor R4 (different resistance values are adjusted in advance by the worker and specific drilling depth can be set), the voltage division of the resistor R5 is carried out, the base electrode of the NPN triode Q2 is lower than 0.7V, the NPN triode Q2 cannot be conducted, the relay J2 is continuously in power-off control, the power input end and the normally-closed contact end are closed, and the motor M2 of the electric drill body is continuously subjected to electric working drilling. When the depth of drilling of the drill bit reaches the depth set by a worker through the adjustable resistor R4 (the resistance value of the adjustable resistor R4 is relatively small at the moment, the voltage division is small), a voltage signal output by a 3 pin of the laser ranging sensor U3 is divided by the adjustable resistor R4 and the resistor R5, the voltage of the resistor R6 is reduced, the current limiting current enters the base electrode of the NPN triode Q2 to be higher than 0.7V, the collector output low level of the NPN triode Q2 is conducted to enter the negative electrode power input end of the relay J2, the relay J2 is electrified to suck the control power input end and the normally closed contact end of the relay J2 to be opened, the control power input end and the normally open contact end of the relay J2 are closed, so that the motor M2 is not electrified, the drilling is not performed any more, meanwhile, the communication sounder BK is electrified to sound, and the worker can close the total power switch after hearing the sound, and the whole drilling flow is completed. Through the above, the utility model discloses after work piece drilling degree of depth is enough, the motor power of automatic shutdown electric drill body, like this, brought the facility for the user, prevented that drilling degree of depth is too big, guaranteed part processingquality.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the two components can be connected mechanically and electrically, can be directly connected, can be indirectly connected through an intermediate medium, and can be communicated with each other inside the two components. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (5)

1. The novel automatic bench drilling machine comprises an electric drill body, a power module, an electric push rod, a linear bearing, a laser ranging module, a workbench, a clamping mechanism and a force transducer, and is characterized by further comprising a drilling moment control circuit and a drilling depth control circuit; the lower ends of the force transducer and the linear bearing are respectively arranged at the upper end of the electric drill body, the lower end of the electric push rod is connected with the upper end of the force transducer, and the upper ends of the electric push rod and the linear bearing are respectively arranged at the rear part of the workbench; the laser ranging module is arranged at the rear side end of the electric drill body; the clamping mechanism is arranged at the front lower end of the workbench, and the power module, the drilling moment control circuit and the drilling depth control circuit are arranged in the electric cabinet; the power output end of the drilling depth control circuit is electrically connected with the power input end of the motor of the electric drill body, and the power output end of the drilling moment control circuit is electrically connected with the power input end of the electric push rod; and the signal output ends of the force transducer and the laser ranging module are respectively and electrically connected with the signal input ends of the drilling moment control circuit and the drilling depth control circuit.

2. The novel automatic bench drill according to claim 1, wherein the clamping mechanism comprises a left chuck, a right chuck, a front guide block, a rear guide block and a screw rod, the front guide block and the rear guide block are respectively provided with guide grooves, front and rear lower side ends of the left chuck and the right chuck are respectively sleeved in the guide grooves of the front guide block and the rear guide block in a sliding manner, lower ends of the left chuck and the right chuck are respectively provided with a screw hole, and the left end and the middle part of the screw rod are respectively screwed into the screw holes of the lower ends of the left chuck and the right chuck.

3. The novel automatic bench drill according to claim 1, wherein the screw threads at the left and right sides of the screw rod are opposite in rotation direction, the screw holes at the lower ends of the left and right chucks are opposite in rotation direction, and are respectively consistent with the rotation directions of the left and right ends of the screw rod, and the right end of the screw rod is provided with an operation hand lever.

4. The novel automatic bench drill according to claim 1, wherein the drilling moment control circuit comprises an electrically connected relay, an adjustable resistor, a resistor and an NPN triode, wherein an anode power input end and an anode control power input end of the relay are connected, a cathode power input end of the force transducer is connected with one end of the first resistor, an emitter of the NPN triode and an anode control power input end of the relay, a signal output end of the force transducer is connected with one end of the adjustable resistor, the other end of the adjustable resistor is connected with the other end of the first resistor, one end of the second resistor is connected with the other end of the second resistor, the other end of the second resistor is connected with a base electrode of the NPN triode, and a collector of the NPN triode is connected with the cathode power input end of the relay.

5. The novel automatic bench drilling machine according to claim 1, wherein the drilling depth control circuit comprises an electrically connected relay, an adjustable resistor, a resistor, an NPN triode and a sounder, one end of the first resistor is connected with an emitter of the NPN triode, one end of the adjustable resistor is connected with the other end of the first resistor and one end of the second resistor, the other end of the second resistor is connected with a base electrode of the NPN triode, a collector electrode of the NPN triode is connected with a negative power input end of the relay, and two normally open contact ends of the relay are respectively connected with two power input ends of the sounder.