CN114178956A

CN114178956A - Hand-held metal workpiece polishing machine

Info

Publication number: CN114178956A
Application number: CN202210083150.8A
Authority: CN
Inventors: 程磊
Original assignee: Nantong Cheli Tools Co ltd
Current assignee: Nantong Cheli Tools Co ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-03-15
Anticipated expiration: 2042-01-25
Also published as: CN114178956B

Abstract

The invention discloses a handheld metal workpiece polishing machine which comprises a machine body, a handle and a polishing sheet, wherein the handle is arranged on the machine body; a transmission chamber is arranged in the machine body; a square groove is arranged in the transmission chamber; a hollow cushion is fixed in the square groove; an isolation net is fixed on the hollow soft cushion; one side of the machine body is provided with a connecting column; a first spring is fixed between the connecting column and the handle; a water storage cavity is arranged in the handle; one end of the water storage cavity is provided with a buffer tube; a second spring is fixed on the connecting column; the second spring is connected with the sealing plate; when the handle is used, the first spring is used for buffering, so that an operator can stably hold the handle; during the use, to water storage intracavity storage water, the internal diameter of buffer tube is greater than the inside diameter of spliced pole insertion buffer tube, and the handle can make radial movement relative to the spliced pole during use, and the sealed buffer tube tip of second spring action messenger shrouding places water and reveals to utilize water to make further shock attenuation, further promoted the comfort level when gripping the handle and making.

Description

Hand-held metal workpiece polishing machine

Technical Field

The invention belongs to the technical field of polishing instruments, and particularly relates to a handheld metal workpiece polishing machine.

Background

The existing handheld polishing machine can generate high-frequency vibration when in use, and can cause fatigue feeling and even harm to human body when being held for a long time; and the existing hand-held polishing machine lacks a damping device, so that the use of the polishing machine is limited.

Disclosure of Invention

The invention provides a handheld metal workpiece polishing machine with a damping effect to overcome the defects of the prior art.

The technical scheme provided by the invention is as follows: the handheld metal workpiece polishing machine comprises a machine body, a handle arranged on one side of the machine body, a collecting cavity arranged on the other side of the machine body and a polishing sheet rotatably connected to the front end of the machine body; a transmission chamber is arranged in the machine body; a square groove is arranged in the transmission chamber; the square groove is positioned on one side of the collection cavity; a hollow cushion is fixed in the square groove; an isolation net is fixed on the hollow soft cushion; one side of the machine body is provided with a connecting column; the handle is sleeved outside the connecting column; a first spring is fixed between the connecting column and the handle; a water storage cavity is arranged in the handle; one end of the water storage cavity is provided with a buffer tube; one end of the connecting column penetrates through the buffer tube and is inserted into the water storage cavity; a second spring is fixed on the part of the connecting column inserted into the water storage cavity; the end part of the second spring is fixed on the sealing plate; the closing plate abuts against the buffer tube.

When the water storage type electric water heater is used, water is injected into the water storage cavity, shock absorption and cooling are carried out by using water pressure, and the stability and comfort degree during holding are improved by matching the elasticity of the first spring; the diameter of the part of the connecting column inserted into the buffer tube is smaller than that of the buffer tube, so that a gap is formed between the connecting column and the buffer tube, the connecting column and the buffer tube can shake relatively, and the handle can perform cushioning through water in the water storage cavity when the machine body shakes; the arrangement of the second spring and the sealing plate enables the water storage cavity to be sealed with the outside, so that the leakage risk caused by water leakage when the machine body vibrates is avoided, and meanwhile, the damping effect of the handle is further improved; when the machine body vibrates, the hollow soft cushion vibrates synchronously, so that the isolation net vibrates; the separation net is used for separating dust and metal debris entering the machine body in the polishing process, and preventing the dust and the metal debris from falling onto a driving device which is arranged at the tail of the transmission chamber and used for driving the polishing sheet to rotate so as to cause interference on the work of the polishing sheet; the isolation net can be cleaned by utilizing the vibration of the machine body, so that impurities are difficult to adsorb on the surface of the isolation net, and the impurities are collected in the collection cavity.

Furthermore, a ring groove is arranged on the handle; a plurality of buffer blocks are connected in the annular groove in a sliding manner; a third spring is fixed between the buffer block and the annular groove; the inner side of the buffer block is abutted against the connecting column; through setting up the buffer block, when the spliced pole was followed the radial shake of handle, utilize buffer block and third spring to carry out the shock attenuation, further promote the stability of handle.

Furthermore, a plurality of magnetic strips are fixed in the collection cavity; a cross beam is arranged at the bottom of the collecting cavity; a bracket is arranged above the cross beam; a plurality of straight bars are arranged on the bracket; sliding grooves are formed in two ends of the support; non-woven fabric baffles are respectively arranged on two sides of the bracket; two ends of the non-woven fabric baffle are respectively inserted into the sliding grooves; the bottom of the cross beam is provided with a collecting box; a felt sheet is fixed in the collection box; a motor is fixed outside the collecting box; the main shaft of the motor is fixed with a fan blade; a dust cover is sleeved outside the polishing sheet; the dust cover is fixed on the machine body; the interior of the dust cover is communicated with the interior of the collecting box through a hose; the connecting point of the hose and the collecting box is positioned below the felt sheet; two sides of the collecting cavity are respectively connected with a locking bar in a sliding way; a first elastic sheet is fixed between the locking bar and the collecting cavity; the end part of the locking bar is propped against the end part of the bracket.

The motor drives the fan blades to rotate, so that negative pressure can be formed in the collecting cavity to attract dust shaken off from the isolating net, and the magnetic strips have an adsorption effect on metal debris, so that impurities in the transmission chamber can be fully absorbed into the collecting cavity; gaps are formed among the straight strips, so that wind power can penetrate through the gaps, and the using effect of the fan blade is ensured; the non-woven fabric baffle is arranged to prevent metal debris and dust from gathering to the magnetic strip, so that the non-woven fabric baffle can be collected on the felt sheet in subsequent use, and impurities can be conveniently cleaned; when the flexible pipe type polishing device is used, impurities generated during polishing of the polishing piece are collected into the collecting box through the flexible pipe, the amount of the impurities entering the transmission chamber is reduced, and the connecting position of the flexible pipe and the collecting box is located below the felt piece, so that the upper surface and the lower surface of the felt piece can adsorb the impurities, the using effect of the felt piece is improved, and meanwhile, the impurities are raised again to influence the collecting effect; through the elasticity of first flexure strip, the locking strip supports the support both ends for seamless connection has guaranteed the separation effect of non-woven fabrics baffle between support and the collection chamber lateral wall, has carried on spacingly to the support simultaneously, guarantees that its stable existence and collection intracavity.

Furthermore, the top of the locking bar penetrates out of the collection cavity and is provided with a push sheet; the top end of the non-woven fabric baffle is provided with an L-shaped groove; a rotary groove is formed in the position, right above the support, of the top of the collecting cavity; a flange is arranged on one side of the rotary groove, which is far away from the magnetic strip; a through groove is formed in one side, close to the magnetic strip, of the rotary groove; the non-woven fabric baffle can pass through the through groove; the top of the collecting cavity is provided with a replacing device; the replacing device comprises a cylinder rotationally connected in the rotary groove, a locking ring rotationally connected to the top of the cylinder, a connecting strip symmetrically and slidably connected to the cylinder, a clamping strip arranged at the bottom of the connecting strip, and a second elastic sheet fixed between the connecting strip and the cylinder; the clamping strip can be embedded into the L-shaped groove; the connecting strip may be in contact with the flange; two brake pieces are symmetrically arranged at the top of the column body; the inner side of the locking ring is provided with brake grooves corresponding to the brake pads one to one; the brake block can slide relative to the brake groove; the top of the locking ring is provided with a pull ring; two guide grooves are symmetrically arranged outside the locking ring; the guide groove may contact the push piece.

The non-woven fabric baffle is composed of a frame and non-woven fabrics fixed on the frame, when the non-woven fabric baffle is used, the non-woven fabric layer is inevitably blocked, at the moment, the cylinder rotates under the matching of the brake pad and the brake groove by rotating the pull ring, at the moment, the connecting strip drives the non-woven fabric baffle and the bracket to synchronously rotate, so that the positions of the two non-woven fabric baffles are changed, and the blocked non-woven fabric baffle rotates to the bottom of the through groove; in the rotating process, one connecting strip contacts the flange to enable the clamping strip to be separated from the L-shaped groove, so that the non-woven fabric baffle far away from the magnetic strip after rotation is disengaged from the connecting strip, and the clamping strip at the bottom of the other connecting strip is embedded into the L-shaped groove at the top end of the non-woven fabric baffle close to the magnetic strip under the elastic action of the second elastic piece; at the moment, the pull ring is pulled to move the cylinder upwards, and the blocked non-woven fabric baffle plate moves out of the collection cavity along the through groove under the matching of the clamping strip and the L-shaped groove, so that the non-woven fabric baffle plate is convenient to clean and replace; before the non-woven fabric baffle rotates synchronously by rotating the pull ring, the brake piece rotates relative to the brake groove, the push piece slides under the pushing of the guide groove, the first elastic piece contracts to separate the lock bar from the bracket, the resistance of the non-woven fabric baffle during rotation is reduced, and the abrasion of the bracket is reduced; after the cylinder rotates in place, the push sheet is inserted into the other guide groove to reset the lock bar, and the support is fixed again to avoid the looseness of the support caused by pulling out the non-woven fabric baffle; through setting up the replacer, can change the non-woven fabrics baffle at any time, guaranteed the result of use of non-woven fabrics baffle.

Furthermore, the middle part of the bracket is rotatably connected with a vibration rod; the bottom of the oscillating rod is provided with a column hole; a pair of spiral grooves is symmetrically arranged on the column hole; a post rod is rotationally connected in the post hole; a fourth spring is fixed between the top of the post rod and the post hole; two guide columns are symmetrically arranged on the column rod; the guide column is inserted into the spiral groove; the beam is provided with an opening; a first connecting rod is rotatably connected in the opening; one end of the first connecting rod is provided with a cam; the bottom of the post rod is abutted against the cam; the other end of the first connecting rod is provided with a first cross groove; a first cross bar is connected in the first cross groove in a sliding manner; a second connecting rod is arranged at the end part of the first cross bar; a fifth spring is fixed between the second connecting rod and the first connecting rod; a second cross-shaped groove is formed in the end part of the second connecting rod; a second cross bar is arranged at the end part of the motor main shaft; the second cross bar is inserted into the second cross groove.

The motor drives the second connecting rod to rotate when rotating through the matching of the second cross groove and the second cross bar, the first connecting rod synchronously rotates through the matching of the first cross groove and the first cross bar, and then the cam rotates; the end part of the second cross bar is hemispherical and is matched with the fifth spring for use, so that when the collecting box is inserted into the bottom of the collecting cavity, the second cross bar can be rapidly embedded into the second cross groove under the rotation of the motor, and the vibration rod can normally play a role.

Furthermore, two positioning grooves are symmetrically formed in two sides of the collecting box; one side of the positioning groove is provided with a connecting hole; an electrode plate is fixed in the connecting hole; a magnetic block is fixed on the inner side of the electrode plate; positioning blocks are connected to the two sides of the collecting cavity in a sliding mode and opposite to the positioning grooves; a third elastic sheet is fixed between the positioning block and the collection cavity; one side of the positioning block is provided with a contact; the contact is inserted into the connecting hole and is electrically connected with the electrode plate; the two electrode plates are respectively and electrically connected with the motor.

When the collecting box is inserted into the collecting cavity, the positioning block contacts the side wall of the collecting box to compress the third elastic sheet, and the contact point is far away from the side wall of the collecting box until the collecting box is installed in place; at the moment, the positioning block is inserted into the positioning groove, and meanwhile, the contact is inserted into the connecting hole and is electrically connected with the electrode plate, so that the motor is communicated with a power supply circuit in the machine body, and the motor can start to work; the arrangement of the magnetic block ensures the connection stability between the contact and the electrode plate, and avoids the unstable work of the motor caused by the separation of the contact and the electrode plate due to the shaking of the machine body; when the collecting box is taken out to clean impurities on the felt sheet, the positioning block is separated from the positioning groove to enable the contact to withdraw from the connecting hole and be separated from the side wall of the collecting box, so that the contact is prevented from being abraded.

In conclusion, when the handle is used, the first spring is used for buffering, so that an operator can stably hold the handle; when the water storage buffer tube is used, water is stored in the water storage cavity, the inner diameter of the buffer tube is larger than the diameter of the connecting column inserted into the inner part of the buffer tube, the handle can move radially relative to the connecting column when the water storage buffer tube is used, the sealing plate seals the end part of the buffer tube under the action of the second spring, and water leakage is prevented, so that the water is used for further damping, and the comfort degree when the handle is held is further improved; meanwhile, the isolating net blocks impurities such as dust and metal debris entering the transmission cavity in the polishing process of the polishing sheet, and the isolating net shakes relative to the hollow cushion by utilizing the vibration of the machine body during working, so that the impurities adhered to the metal net shake off, and the impurities are collected by utilizing the collecting cavity, thereby ensuring the stability of the machine body during working and having certain dust removal effect.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Figure 2 is an isometric cross-sectional view of the present invention.

Fig. 3 is a front view of the present invention.

Fig. 4 is an isometric cross-sectional view taken along line a-a of fig. 3.

Fig. 5 is a partially enlarged view of a portion C in fig. 4.

Fig. 6 is a partially enlarged view of a portion D in fig. 4.

Fig. 7 is a partially enlarged view of a portion E in fig. 4.

Fig. 8 is an isometric cross-sectional view taken along line B-B of fig. 3.

Fig. 9 is an isometric cross-sectional view of the body of fig. 1.

Fig. 10 is a schematic view of the connection between the bracket and the locking bar according to the present invention.

Fig. 11 is an isometric cross-sectional view of the oscillating bar of fig. 7.

Fig. 12 is an exploded view of a portion of the structure of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

The hand-held metal workpiece polishing machine shown in fig. 1-12 comprises a machine body 1, a handle 2 arranged on one side of the machine body 1, a collecting cavity 3 arranged on the other side of the machine body 1, and a polishing sheet 4 rotatably connected to the front end of the machine body 1; the machine body 1 is internally provided with a driving device for driving the polishing sheet 4 to rotate, the working principle of the driving device and the connection mode of the driving device and an external power supply are the same as those of the prior art, and the description is omitted; a transmission chamber 11 is arranged in the machine body 1; a square groove 12 is arranged in the transmission chamber 11; the square groove 12 is positioned at one side of the collection cavity 3; a hollow cushion 13 is fixed in the square groove 12, the hollow cushion 13 is made of rubber, an isolation net 14 is fixed on the hollow cushion 13, and the isolation net 14 is used for blocking impurities entering the transmission chamber 11 so that the impurities can be collected in the collection cavity 3; a connecting column 15 is arranged on one side of the machine body 1, the handle 2 is sleeved outside the connecting column 15, and a first spring 151 is fixed between the connecting column 15 and the handle 2; a water storage cavity 21 is arranged in the handle 2, one end of the water storage cavity 21 is provided with a buffer tube 22, and one end of the connecting column 15 penetrates through the buffer tube 22 and is inserted into the water storage cavity 21; a second spring 152 is fixed on the part of the connecting column 15 inserted into the water storage cavity 21, and the end part of the second spring 152 is fixed on the sealing plate 153; the seal plate 153 is abutted against the buffer tube 22 and is sealed with the buffer tube 22; the handle 2 is provided with a ring groove 23, and a plurality of buffer blocks 24 are connected in the ring groove 23 in a sliding manner; a third spring 25 is fixed between the buffer block 24 and the annular groove 23; the inner side of the buffer block 24 is abutted against the connecting column 15 and can slide relative to the connecting column 15.

Furthermore, one end of the collecting cavity 3 is fixed with a plurality of magnetic strips 31, and the bottom of the collecting cavity is provided with a cross beam 32; a bracket 33 is arranged above the cross beam 32, a plurality of straight bars 331 are arranged on the bracket 33, and gaps are arranged among the straight bars 331; the two ends of the bracket 33 are provided with sliding grooves 332, the two sides are respectively provided with a non-woven fabric baffle 333, and the two ends of the non-woven fabric baffle 333 are respectively inserted into the sliding grooves 332, so that the non-woven fabric baffle 333 is in sliding connection with the bracket 33; the bottom of the beam 32 is provided with a collecting box 5, a felt piece 51 is fixed in the collecting box 5, and the upper surface and the lower surface of the felt piece 51 are provided with felts for collecting impurities; a motor 52 is fixed outside the collecting box 5, and a main shaft of the motor 52 is fixedly connected with a fan blade 53; the dust cover 6 is sleeved outside the polishing sheet 4, the dust cover 6 is fixed on the machine body 1, the inside of the dust cover 6 is communicated with the inside of the collecting box 5 through a hose 61, a circle of hairbrush 62 is fixed outside, and a separation piece 63 is arranged on the dust cover 6 and positioned between the hairbrush 62 and the polishing sheet 4, so that when the hairbrush 62 is bent by contacting the surface of a metal piece in the polishing process, the bending direction of the hairbrush 62 is limited to bend the dust cover 6 to the outside, and the danger caused by the contact of the hairbrush 62 and the polishing sheet 4 which runs at a high speed is avoided; the connection point of the hose 61 to the collecting box 5 is located below the felt sheet 51; two sides of the collecting cavity 3 are respectively connected with a locking bar 34 in a sliding way, a first elastic sheet 341 is fixed between one end of the locking bar 34 and the collecting cavity 3, and the other end of the locking bar is propped against the end part of the bracket 33.

Further, the top of the locking bar 34 penetrates out of the collection cavity 3 and is provided with a push sheet 342; the top end of the non-woven fabric baffle 333 is provided with an L-shaped groove 334; a rotary groove 35 is arranged at the top of the collecting cavity 3 and is positioned right above the bracket 33, a flange 351 is arranged at one side of the rotary groove 35, which is far away from the magnetic strip 31, a through groove 352 is arranged at one side of the rotary groove 35, which is close to the magnetic strip 31, and a non-woven fabric baffle 333 can pass through the through groove 352; the top of the collection cavity 3 is provided with a replacer 7; the replacer 7 comprises a cylinder 71 which is rotatably connected in the rotary groove 35, a locking ring 72 which is rotatably connected at the top of the cylinder 71, a connecting bar 73 which is symmetrically and slidably connected on the cylinder 71, a clamping bar 731 arranged at the bottom of the connecting bar 73, and a second elastic sheet 732 fixed between the connecting bar 73 and the cylinder 71; the clamping strip 731 can be embedded into the L-shaped groove 334, so that the non-woven fabric baffle 333 can be driven to synchronously move when the column body 71 moves; the connecting bar 73 is adapted to contact the flange 351 so that the connecting bar 73 slides laterally relative to the cylinder 71; two brake blocks 74 are symmetrically arranged at the top of the column body 71; the inner side of the lock ring is provided with a brake groove 721 corresponding to the brake pads 74 one by one, and the brake pads 74 are embedded in the brake groove 721 and can slide relative to the brake groove 721; the top of the locking ring 72 is provided with a pull ring 722, and the outside is symmetrically provided with two guide grooves 723; the guide groove 723 may contact the push tabs 342.

Further, the middle part of the bracket 33 is rotatably connected with a vibrating rod 36; the bottom of the oscillating rod 36 is provided with a column hole 361, a pair of spiral grooves 362 is symmetrically arranged on the column hole 361, and the two spiral grooves 362 have the same rotating direction; a column rod 363 is rotatably connected in the column hole 361, and a fourth spring 364 is fixed between the top of the column rod 363 and the column hole 361; two guide columns 365 are symmetrically arranged on the column rod 363, and the guide columns 365 are inserted into the spiral groove 362; the beam 32 is provided with an opening 37, and a first connecting rod 371 is rotatably connected in the opening 37; one end of the first connecting rod 371 is provided with a cam 372, and the bottom of the column rod 363 is abutted against the cam 372; the other end of the first connecting rod 371 is provided with a first cross recess 373; a first cross bar 374 is slidably connected in the first cross groove 373, a second connecting rod 375 is arranged at the end part of the first cross bar 374, and a fifth spring 376 is fixed between the second connecting rod 375 and the first connecting rod 371; a second cross-shaped groove 377 is formed at the end part of the second connecting rod 375; the end of the main shaft of the motor 52 is provided with a second cross bar 54, and the second cross bar 54 is inserted into the second cross groove 377.

Furthermore, two positioning grooves 55 are symmetrically arranged on two sides of the collecting box 5, a connecting hole 56 is arranged on one side of each positioning groove 55, an electrode plate 57 is fixed in each connecting hole 56, and a magnetic block 58 is fixed on the inner side of each electrode plate 57; the two sides of the collecting cavity 3 are connected with a positioning block 38 in a sliding way at the position opposite to the positioning groove 55, and a third elastic piece 381 is fixed between the positioning block 38 and the collecting cavity 3; one side of the positioning block 38 is provided with a contact 382, and the contact 382 is inserted into the connecting hole 56 and is electrically connected with the electrode plate 57; the two electrode plates 57 are electrically connected to the motor 52, respectively.

When the polishing machine is used specifically, the machine body 1 works to drive the polishing sheet 4 to rotate at a high speed, and the handle 2 is held to polish the surface of a metal piece; the moisture in the water storage cavity 21, the first spring 151, the third spring 25 and the buffer block 24 act together to absorb shock of the handle 2, so that the comfort degree of the handle 2 during holding is improved; the machine body 1 supplies power to the motor 52 through the contact 382 and the electrode slice 57, the motor 52 drives the fan blades 53 to rotate so as to form negative pressure in the collection cavity 3, the negative pressure and the magnetic strip 31 jointly act to adsorb impurities in the transmission chamber 11 and the dust cover 6, and the impurities are collected on the felt slice 51; impurities in the transmission chamber 11 fall on the non-woven fabric baffle 333 under the influence of negative pressure, and the motor 52 drives the oscillating rod 36 to periodically knock the non-woven fabric baffle 333 when rotating, so that the impurities fall on the felt sheet 51 to be collected; after the nonwoven fabric sheet 333 is blocked, the pull ring 722 is rotated to change the positions of the nonwoven fabric sheets 333 at both sides of the nonwoven fabric sheet, and then the blocked nonwoven fabric sheet 333 is pulled out of the collecting chamber 3 along the through groove 352 by pulling the pull ring 722, so as to clean or replace the nonwoven fabric sheet 333.

Claims

1. A hand-held metal workpiece polishing machine comprises a machine body (1), a handle (2) arranged on one side of the machine body (1), a collecting cavity (3) arranged on the other side of the machine body (1), and a polishing sheet (4) rotatably connected to the front end of the machine body (1); the method is characterized in that: a transmission chamber (11) is arranged in the machine body (1); a square groove (12) is arranged in the transmission chamber (11); the square groove (12) is positioned at one side of the collecting cavity (3); a hollow soft cushion (13) is fixed in the square groove (12); an isolation net (14) is fixed on the hollow soft cushion (13); one side of the machine body (1) is provided with a connecting column (15); the handle (2) is sleeved outside the connecting column (15); a first spring (151) is fixed between the connecting column (15) and the handle (2); a water storage cavity (21) is arranged in the handle (2); one end of the water storage cavity (21) is provided with a buffer tube (22); one end of the connecting column (15) penetrates through the buffer tube (22) and is inserted into the water storage cavity (21); a second spring (152) is fixed on the part of the connecting column (15) inserted into the water storage cavity (21); the end part of the second spring (152) is fixed on the sealing plate (153); the sealing plate (153) abuts against the buffer tube (22).

2. The hand-held metal workpiece polisher in accordance with claim 1 with the following features: the handle (2) is provided with a ring groove (23); a plurality of buffer blocks (24) are connected in the annular groove (23) in a sliding manner; a third spring (25) is fixed between the buffer block (24) and the annular groove (23); the inner side of the buffer block (24) is propped against the connecting column (15).

3. The hand-held metal workpiece polisher in accordance with claim 1 with the following features: a plurality of magnetic strips (31) are fixed in the collection cavity (3); a cross beam (32) is arranged at the bottom of the collecting cavity (3); a bracket (33) is arranged above the cross beam (32); a plurality of straight bars (331) are arranged on the bracket (33); sliding grooves (332) are formed in the two ends of the support (33); non-woven fabric baffles (333) are respectively arranged on two sides of the bracket (33); two ends of the non-woven fabric baffle (333) are respectively inserted into the sliding grooves (332); the bottom of the cross beam (32) is provided with a collecting box (5); a felt sheet (51) is fixed in the collecting box (5); a motor (52) is fixed outside the collecting box (5); a fan blade (53) is fixed on the main shaft of the motor (52); a dust cover (6) is sleeved outside the polishing sheet (4); the dust cover (6) is fixed on the machine body (1); the interior of the dust cover (6) is communicated with the interior of the collecting box (5) through a hose (61); the connecting point of the hose (61) and the collecting box (5) is positioned below the felt sheet (51); two sides of the collecting cavity (3) are respectively connected with a locking bar (34) in a sliding way; a first elastic sheet (341) is fixed between the locking bar (34) and the collection cavity (3); the end part of the locking bar (34) is propped against the end part of the bracket (33).

4. The hand-held metal workpiece polisher in accordance with claim 3 with the following features: the top of the locking bar (34) penetrates out of the collection cavity (3) and is provided with a push sheet (342); the top end of the non-woven fabric baffle (333) is provided with an L-shaped groove (334); a rotary groove (35) is formed in the top of the collecting cavity (3) and is positioned right above the bracket (33); a flange (351) is arranged on one side, away from the magnetic strip (31), of the rotary groove (35); a through groove (352) is formed in one side, close to the magnetic strip (31), of the rotary groove (35); the non-woven fabric baffle (333) can penetrate through the through groove (352); the top of the collection cavity (3) is provided with a replacer (7); the replacer (7) comprises a cylinder (71) rotationally connected in the rotary groove (35), a locking ring (72) rotationally connected to the top of the cylinder (71), connecting strips (73) symmetrically and slidably connected to the cylinder (71), clamping strips (731) arranged at the bottoms of the connecting strips (73), and a second elastic sheet (732) fixed between the connecting strips (73) and the cylinder (71); the clamping strip (731) can be embedded into the L-shaped groove (334); the connecting strip (73) being contactable with the flange (351); two brake blocks (74) are symmetrically arranged at the top of the cylinder (71); the inner side of the locking ring (72) is provided with brake grooves (721) which correspond to the brake pads (74) one by one; the brake pad (74) is slidable relative to the brake groove (721); the top of the locking ring (72) is provided with a pull ring (722); two guide grooves (723) are symmetrically arranged outside the locking ring (72); the guide groove (723) may contact the push tab (342).

5. The hand-held metal workpiece polisher in accordance with claim 3 with the following features: the middle part of the bracket (33) is rotatably connected with a vibration rod (36); the bottom of the oscillating rod (36) is provided with a column hole (361); a pair of spiral grooves (362) are symmetrically arranged on the column hole (361); a column rod (363) is rotationally connected in the column hole (361); a fourth spring (364) is fixed between the top of the post rod (363) and the post hole (361); two guide columns (365) are symmetrically arranged on the column rod (363); the guide column (365) is inserted into the spiral groove (362); the cross beam (32) is provided with an opening (37); a first connecting rod (371) is rotationally connected with the opening (37); one end of the first connecting rod (371) is provided with a cam (372); the bottom of the post rod (363) is abutted to the cam (372); the other end of the first connecting rod (371) is provided with a first cross groove (373); a first cross bar (374) is connected in the first cross groove (373) in a sliding manner; a second connecting rod (375) is arranged at the end part of the first cross bar (374); a fifth spring (376) is fixed between the second connecting rod (375) and the first connecting rod (371); a second cross-shaped groove (377) is formed in the end portion of the second connecting rod (375); a second cross bar (54) is arranged at the end part of the main shaft of the motor (52); the second cross bar (54) is inserted into the second cross groove (377).

6. The hand-held metal workpiece polisher in accordance with claim 3 with the following features: two positioning grooves (55) are symmetrically arranged on two sides of the collecting box (5); a connecting hole (56) is formed in one side of the positioning groove (55); an electrode plate (57) is fixed in the connecting hole (56); a magnetic block (58) is fixed on the inner side of the electrode plate (57); the two sides of the collecting cavity (3) are connected with positioning blocks (38) in a sliding way at positions opposite to the positioning grooves (55); a third elastic piece (381) is fixed between the positioning block (38) and the collection cavity (3); one side of the positioning block (38) is provided with a contact (382); the contact (382) is inserted into the connecting hole (56) and is electrically connected with the electrode plate (57); the two electrode plates (57) are respectively and electrically connected with the motor (52).