CN219582476U - Novel handheld electronic polisher - Google Patents

Abstract

A novel handheld electric sander comprises a power module, an electric sander body, an electric telescopic rod and a power switch; the device also comprises a rotary power supply mechanism and a leakage detection circuit; the rear end of the handle of the electric polisher body is provided with an element box, and the leakage detection circuit and the power supply module are arranged in the element box and are electrically connected; the lower end of the power output shaft of the movable grinding machine body is provided with a connecting pipe, the electric telescopic rod is arranged at the inner upper end of the connecting pipe, the lower end of the electric telescopic rod is provided with a guide block, a guide groove is arranged in the connecting pipe, and the guide block is slidably arranged in the guide groove; the lower end of the guide block is provided with a connecting rod, and the polishing head is arranged at the lower end of the connecting rod; the rotary power supply mechanism is arranged at the lower end of the shell of the electric grinding machine body; the power output end of the rotary power supply mechanism is electrically connected with the power input end of the electric telescopic rod. The polishing machine can conveniently polish the deep hole, the surface and other areas of the workpiece; the probability of electric shock accidents of operators is reduced.

Description

Novel handheld electronic polisher

Technical Field

The utility model relates to the technical field of electric grinding machine equipment, in particular to a novel handheld electric grinding machine.

Background

The hand-held electric grinding machine is equipment for grinding the end face of a workpiece, and is generally used for grinding the surface of the workpiece (the grinding head is relatively large in appearance), grinding the inner side end of the workpiece (the grinding head is relatively small in appearance) and the like according to the different appearances of grinding heads.

Along with the progress of industrial technology, the technology of the handheld electric sander has also been developed to a certain extent, for example, patent numbers 201720809191.5 and patent names of ' a handheld electric sander ' in China are issued, and the content of the technology is recorded on ' a dust removal air pipe below a designed host shell is fixed on the sander through a buckle, so that the chips on a sanding surface can be conveniently removed while the sanding is performed, the cleanliness of the sanding surface is maintained, and the problem that the chips scratch the sanding surface is avoided; the folding handle is designed to replace the original side wall fixed handle, so that the problem that the handle occupies large space and is inconvenient to store when not used is avoided, and the polisher is convenient to store; the side wall light supplementing lamp is convenient to provide sufficient light for a user during polishing through the design, and is connected with a polishing machine through the rotary buckle, so that the polishing face inclination angle can be adjusted conveniently. The above-mentioned patent has the advantages of maintaining the cleanliness of the polished surface, folding the handle and supplementing light, but has the following disadvantages due to the limited structure. The method comprises the following steps: the motor power output shaft of the comparison patent is fixedly connected with the polishing head (polishing grinding wheel), namely when the motor power output shaft is applied to polishing in a hole in the depth of a workpiece (the polishing head with a relatively small appearance is adopted), the polishing head possibly cannot polish in the hole in the depth because the height of the polishing head is too low, and if the motor power output shaft is designed to be relatively long during direct production, the polishing position in the deeper depth can be polished, but the distance between the hands of an operator and polishing points can be increased by the relatively long output shaft, so that inconvenience can be brought to the operator when the surface of the workpiece is polished (the relatively long output shaft is inconvenient to accurately position and polish the surface of the workpiece, and eccentric force generated by polishing can be amplified, so that inconvenience is brought to operation). And two,: the comparison patent does not have the electric leakage control function, and the handheld polisher is also comparatively abominable because of being operating personnel hand-held type operation, working condition, when electric leakage takes place for reasons such as motor, has the probability that leads to operating personnel to electrocute. In summary, the existing handheld sander has a larger technical improvement scope, and the handheld electric sander is particularly necessary to provide a handheld electric sander which can adjust the length between the sanding head and the power output shaft according to needs, facilitate sanding operation in different operation areas and reduce the electric shock probability of operators as much as possible.

Disclosure of Invention

In order to overcome the defects of the prior electric sander, which are caused by the limited structure, the utility model provides a novel handheld electric sander based on a handheld electric sander body, wherein in application, under the combined action of related mechanisms, an operator can control the length between a sanding head and a power output shaft as required, so that the sanding operation is conveniently performed on the deep hole, the surface and other areas of a workpiece, and the input power supply can be disconnected at the first time of the electric leakage of the handheld electric sander body, so that the occurrence probability of electric shock accidents of the operator is reduced as much as possible.

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

a novel handheld electric sander comprises a power module, an electric sander body, an electric telescopic rod and a power switch; the electric leakage detection device is characterized by also comprising a rotary power supply mechanism and an electric leakage detection circuit; the rear end of the handle of the electric polisher body is provided with an element box, and the leakage detection circuit and the power supply module are arranged in the element box; the lower end of the power output shaft of the electric grinding machine body is provided with a connecting pipe, the electric telescopic rod is arranged at the inner upper end of the connecting pipe, the lower end of the electric telescopic rod is provided with a guide block, a guide groove is arranged in the connecting pipe, and the guide block is slidably arranged in the guide groove; the lower end of the guide block is provided with a connecting rod, and the polishing head of the electric polishing machine body is arranged at the lower end of the connecting rod; the rotary power supply mechanism is arranged outside the lower end of the shell of the electric grinding machine body; the power output end of the rotary power supply mechanism is electrically connected with the power input end of the electric telescopic rod, and the two control signal ends of the leakage detection circuit are electrically connected in series between the two power input ends of the electric grinding machine body.

Further, the rotation power supply mechanism comprises two conductive bearings, an outer sleeve and an inner sleeve, wherein the inner sleeve made of insulating materials is tightly sleeved on the outer side of the connecting pipe, the two conductive bearings are tightly sleeved on the outer side of the inner sleeve at intervals from the inner ring, the outer rings of the two bearings are tightly sleeved on the inner side of the outer sleeve made of insulating materials, and the outer side of the upper end of the outer sleeve is arranged at the outer middle part of the lower end of the shell of the electric grinding machine body.

Further, in the rotary power supply mechanism, wires connected with the inner sides of the two conductive bearing inner rings are respectively connected with two ends of a power input of the electric telescopic rod.

Further, the external diameter of the guide block is smaller than the internal diameter of the guide groove, the travel of the movable column of the electric telescopic rod is smaller than the height of the guide groove, and the internal diameter of the lower end of the connecting pipe is larger than the external diameter of the connecting rod.

Further, the electric leakage detection circuit comprises a silicon controlled rectifier, a relay, a resistor and a buzzer which are electrically connected, wherein a cathode of the silicon controlled rectifier is connected with an anode power input end of the relay and a cathode power input end of the buzzer, a control electrode of the silicon controlled rectifier is connected with one end of the resistor, the relay is connected with a cathode power input end of the buzzer, and the other end of the resistor is connected with the outer side of a shell of the electric grinding machine body through a wire.

The utility model has the beneficial effects that: the novel hand-held electric sander body is based on, in application, operators can change the length between the sanding head and the power output shaft by controlling the length change of the electric telescopic rod according to the needs, so that the deep hole of a workpiece is convenient, and the surface of the workpiece and other areas are convenient to polish; under the action of the leakage detection circuit, the input power supply can be disconnected at the first time of the leakage of the body of the handheld electric grinding machine, so that the occurrence probability of electric shock accidents of operators is reduced as much as possible. In conclusion, the novel plastic has good application prospect.

Drawings

The utility model is further described below with reference to the drawings and examples.

FIG. 1 is an enlarged schematic view of the whole and part of the present utility model;

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

Detailed Description

The novel handheld electric polisher comprises a power module A1, a handheld electric polisher body M1, a miniature electric telescopic rod M and a power switch S2 (a handle is positioned outside an opening at the upper end of an element box); the electric leakage detection device is also provided with a rotary power supply mechanism 2 and an electric leakage detection circuit 3; the rear end of the handle of the electric polisher body M1 is provided with an element box 4, and the leakage detection circuit 3 and the power supply module A1 are arranged on a circuit board of the element box 4; the lower end of the power output shaft of the electric grinding machine body is welded with a hollow connecting pipe 5, a cylinder body of an electric telescopic rod M is fastened at the inner upper end of the connecting pipe 5 (a gap-filling sealant is fixed between the outer end of the cylinder body and the inner upper end of the connecting pipe), a rectangular guide block 6 is welded at the lower end of a movable column of the electric telescopic rod M, a section of the middle part in the connecting pipe 5 is of a rectangular structure and is used as a guide groove 7, and the guide block 6 is slidably positioned in the guide groove 7; the middle part of the lower end of the guide block 6 is vertically welded with a connecting rod 8 with external threads at the lower outer side end (a limiting plate 9 with the outer diameter smaller than the outer diameter of the polishing head is arranged on the outer side of the lower end), the middle part of the polishing head 10 of the electric polishing machine body is sleeved outside the lower end of the connecting rod 8 and screwed into the external threads at the lower end of the connecting rod 8 through a nut, and then the polishing head 10 is arranged at the lower end of the connecting rod 8; the rotary power supply mechanism 2 is arranged in the middle of the lower end of the shell of the electric grinding machine body M.

As shown in fig. 1 and 2, the rotary power supply mechanism comprises two copper conductive bearings 21, a hollow outer sleeve 22 and a hollow inner sleeve 23, wherein the plastic inner sleeve 23 is tightly sleeved outside the connecting pipe 8, the two bearings 21 are tightly sleeved outside the inner sleeve 23 at a certain distance from top to bottom, the outer rings of the two bearings 21 are tightly sleeved inside the plastic outer sleeve 22, and an outer flange 24 at the upper end of the outer sleeve 22 is fixedly arranged at the middle part outside the lower end of the shell of the electric grinding machine body M through nuts. In the rotary power supply mechanism, wires connected with the inner sides of the inner rings of the two conductive bearings 21 enter the connecting pipe from top to bottom through wire grooves distributed from the outer side end of the inner sleeve 23, small holes on the right side of the upper end of the connecting pipe 5, and are respectively connected with the two ends of the power input of the electric telescopic rod M, and wires connected with the outer rings of the two bearings 21 are led out into the element box 4 through holes on the right side of the upper end of the outer sleeve 22 (the wires are fixed on the shell of the electric grinding machine body through fixing clips and the like). The external diameter of the guide block 6 is slightly smaller than the 7 internal diameter of the guide groove by 0.2 mm, the travel of the movable column of the electric telescopic rod M is smaller than the height of the guide groove by 3 mm, and the internal diameter of the lower end of the connecting pipe 5 is slightly larger than the external diameter of the connecting rod 8. The leakage detection circuit comprises a silicon controlled rectifier VS, a relay K1, a resistor R1 and a buzzer B which are connected through circuit board wiring, wherein the cathode of the silicon controlled rectifier VS is connected with the positive power input end of the relay K1 and the positive power input end of the buzzer B, the control electrode of the silicon controlled rectifier VS is connected with one end of the resistor R1, the negative power input end of the relay K1 is connected with the negative power input end of the buzzer B, and the other end of the resistor R1 is connected with the outer side of a shell T of the electric grinding machine body M through a wire. The power input ends 1 and 2 pins of the power module A1 are connected with 220V power input wires through wires respectively, and the power output ends 3 and 4 pins of the power module A1 are connected with the power input ends 1 of the power switch S2, the power input ends of the pin and leakage detection circuit are connected with the anode of the silicon controlled rectifier VS and the power input end of the cathode of the buzzer B through wires respectively; the two paths of power output ends 3, 4 pins and 5, 6 pins of the power switch S2 are respectively connected with the outer rings of the two conductive bearings of the power input end of the rotary power supply mechanism through wires, the inner rings of the two conductive bearings of the power output end of the rotary power supply mechanism are respectively connected with the positive and negative power input ends of the electric telescopic rod M through wires, and the two control power input ends and the two normally closed contact ends of the control signal end relay K1 of the leakage detection circuit are connected in series between the two power input ends of the electric grinder body M and the 220V power wire through wires.

Fig. 1 and 2 show that the novel hand-held electric sander body M1. After the power switch S1 of the electric grinding machine body M1 is turned on, the power output shaft of the electric grinding machine body M1 drives the guide block 6 to rotate through the connecting pipe 5 and the guide groove, the guide block 6 drives the grinding head 10 to rotate through the connecting rod 8, and therefore an operator can hold the electric grinding machine body M1 to grind a relevant area through the grinding head 10. After 220V alternating current power enters the power input end of the power module A1, the 3 pin and the 4 pin of the power module A1 output stable direct current 12V power to enter the power switch S2 and the power input end of the leakage detection circuit. When the workpiece or the equipment needs to be polished in a deep hole with a relatively large inner diameter, or the surface of the workpiece or the like, an operator dials the handle of the power switch S2 leftwards or rightwards, so that pins 1 and 2, pins 3 and 4 or pins 5 and 6 of the power switch S2 are respectively communicated, and the positive and negative or positive electrode power input ends of the electric telescopic rod M are powered on (power is lost after the power switch S2 is closed). The movable column of the electric telescopic rod M pushes the guide block 6 to move downwards along the guide groove 7 in the time of power supply of the positive pole and the negative pole, so that the polishing head 10 moves downwards, the length formed between the polishing head 10 and the power output shaft is prolonged, and the deep part of a workpiece can be polished conveniently. The movable column of the electric telescopic rod M drives the guide block 6 to move upwards along the guide groove 7 in the time of power supply of the negative pole and the positive pole of the electric telescopic rod M, and then the polishing head 10 moves upwards, so that the length formed between the polishing head 10 and the power output shaft is shortened, and the surface of a workpiece can be polished conveniently (when the connecting pipe 5 drives the electric telescopic rod M to rotate, the outer ring of the connecting pipe rotates along the inner rings of the two conductive bearings 21, the outer ring of the bearing does not rotate, and a 12V power supply supplies power to the electric telescopic rod through the outer ring, the bearing and the inner ring of the conductive bearings). Through the above, the utility model discloses can conveniently polish to work piece depths to when having prevented to polish the work piece surface, the inconvenient accurate positioning of relative long output shaft is polished the work piece surface, and the eccentric force that produces of polishing also can enlarge, brings inconvenient problem for the operation.

As shown in fig. 1 and 2, when the operator holds the electric grinder body M1, and the electric grinder body M1 does not leak electricity, the thyristor VS is not turned on, so that the relay K1 cannot be electrically attracted, and the motor of the electric grinder body M1 is normally electrically operated to grind a workpiece. When electric polisher body M1 electric leakage, casing are electrified, the electric leakage can step down the current-limiting through resistance R1 and trigger silicon controlled rectifier VS and switch on, and then, relay K1 can obtain its control power input of electricity actuation and normally closed contact end open circuit, like this, electric polisher body M1's motor loses electric work (buzzer B gets electric sounding suggestion staff simultaneously, electric polisher body electric leakage, notice safety and maintenance), the utility model discloses just can be when electric leakage such as electric polisher body M1's motor for polisher body can break off input power very first time, like this, reduced the probability that operating personnel electric shock accident took place as far as possible. In fig. 2, the power module A1 is a finished product of a switching power module for converting ac 220V to dc 12V; the resistance value of the resistor R1 is 8M; the model of the silicon controlled rectifier VS is MCR100-1; the buzzer B is an active continuous sound buzzer alarm finished product of model TM 12V; the relay K1 is a DC12V relay; the electric telescopic rod M is a miniature reciprocating electric push rod finished product with working current of 12V, and the stroke of the movable rod is 8 cm.

It should be noted that while the above describes and illustrates embodiments of the present utility model, it is not intended that the embodiments include only a single embodiment, but that this description is made for the sake of clarity only, and it will be appreciated by one skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the utility model, and other embodiments will be understood by those skilled in the art, and accordingly, the scope of the utility model is defined by the appended claims and their equivalents.

Claims (5)

1. A novel handheld electric sander comprises a power module, an electric sander body, an electric telescopic rod and a power switch; the electric leakage detection device is characterized by also comprising a rotary power supply mechanism and an electric leakage detection circuit; the rear end of the handle of the electric polisher body is provided with an element box, and the leakage detection circuit and the power supply module are arranged in the element box; the lower end of the power output shaft of the electric grinding machine body is provided with a connecting pipe, the electric telescopic rod is arranged at the inner upper end of the connecting pipe, the lower end of the electric telescopic rod is provided with a guide block, a guide groove is arranged in the connecting pipe, and the guide block is slidably arranged in the guide groove; the lower end of the guide block is provided with a connecting rod, and the polishing head of the electric polishing machine body is arranged at the lower end of the connecting rod; the rotary power supply mechanism is arranged outside the lower end of the shell of the electric grinding machine body; the power output end of the rotary power supply mechanism is electrically connected with the power input end of the electric telescopic rod, and the two control signal ends of the leakage detection circuit are electrically connected in series between the two power input ends of the electric grinding machine body.

2. The novel handheld electric sander according to claim 1, wherein the rotary power supply mechanism comprises two conductive bearings, an outer sleeve and an inner sleeve, the inner sleeve made of insulating materials is tightly sleeved outside the connecting pipe, the two conductive bearings are tightly sleeved outside the inner sleeve at intervals from the inner ring, the outer rings of the two bearings are tightly sleeved on the inner side of the outer sleeve made of insulating materials, and the outer side of the upper end of the outer sleeve is arranged at the outer middle of the lower end of the shell of the electric sander body.

3. The novel hand-held electric sander according to claim 1, wherein in the rotary power supply mechanism, the wires connected to the inner sides of the two conductive bearing inner rings are connected to the two ends of the power input of the electric telescopic rod respectively.

4. The novel hand-held electric sander as set forth in claim 1, wherein the guide block has an outer diameter smaller than the inner diameter of the guide groove, the movable column stroke of the electric telescopic rod is smaller than the height of the guide groove, and the inner diameter of the lower end of the connecting pipe is larger than the outer diameter of the connecting rod.

5. The novel hand-held electric sander according to claim 1, wherein the leakage detection circuit comprises a silicon controlled rectifier, a relay, a resistor and a buzzer which are electrically connected, wherein a cathode of the silicon controlled rectifier is connected with a positive power input end of the relay and the buzzer, a control electrode of the silicon controlled rectifier is connected with one end of the resistor, the relay is connected with a negative power input end of the buzzer, and the other end of the resistor is connected with the outer side of a shell of the electric sander body through a wire.