CN111571375B

CN111571375B - Automatic sanding machine for door handle

Info

Publication number: CN111571375B
Application number: CN202010447524.0A
Authority: CN
Inventors: 王学远; 沈旭波
Original assignee: Ningbo Daxie Development Zone Jiajie Zinc Casting Co ltd
Current assignee: Ningbo Daxie Development Zone Jiajie Zinc Casting Co ltd
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2021-10-15
Anticipated expiration: 2040-05-25
Also published as: CN111571375A

Abstract

The invention discloses an automatic sanding machine for a door handle, which comprises a conveying belt and the door handle, wherein a tray for placing the door handle is arranged on the conveying belt, the conveying belt is provided with a convenient device which can not only effectively reduce the door handle grinding process time and improve the processing efficiency, but also can cool down the door handle and remove the scraps attached to the surface of the door handle, the automatic door handle sanding machine can effectively reduce the time of the door handle grinding process and improve the processing efficiency, the next door handle to be polished is transferred to the polishing machine, so that the door handle is prevented from being taken and placed back and forth by a manipulator, a large amount of time is saved, therefore, the polishing process is effectively reduced, the polishing efficiency is improved, dust removal and heat dissipation effects can be performed on the polished door handle, the cleanliness of the door handle is improved, the temperature rise rate of the working environment is reduced, and the door handle is convenient for workers to hold for operation.

Description

Automatic sanding machine for door handle

Technical Field

The invention relates to the technical field of door handle processing, in particular to an automatic sanding machine for a door handle.

Background

The door handle is the equipment that is used for carrying out burnishing and polishing to the door handle of production, and its sanding technology is at first to pass through the conveyer belt with the tray that holds a plurality of door handles and carry the position of snatching, and the manipulator is grabbed the door handle in the tray through program control and is taken out to remove to the sanding machine position of polishing and polish, and the back of polishing, the manipulator is placed back the former position point of snatching of tray with the door handle, then moves to next door handle department of not polishing and snatchs it again. The outdoor is provided with a control cabinet, namely an operating device, which is used for controlling the actions of the robot and the sanding machine which are positioned indoors. An exhaust fan is arranged above the sanding machine and used for removing dust and other impurities and keeping the room clean.

In the prior door handle sanding machine, before a door handle is sanded, a manipulator needs to move to a tray, the sanded door handle is placed back to the tray, then the manipulator moves to the next door handle without sanding to grab the door handle, and then the grabbed door handle is moved to a sanding machine to be sanded, so that a large amount of time is consumed in the process of the robot going back and forth, unnecessary time is wasted when the next door handle to be sanded is searched and taken out, the time required by a door handle sanding process is increased, and the working efficiency is reduced. Furthermore, the door handle surface after polishing is attached with scraps, which increases the number of processes for treating the door handle scraps. Therefore, an automatic sanding machine for the door handle is provided.

Disclosure of Invention

The invention aims to provide an automatic sanding machine for a door handle, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an automatic sanding machine of door handle, includes conveyer belt and door handle, be equipped with the tray that is used for placing the door handle on the conveyer belt, conveyer belt department is equipped with and can enough effectively reduce door handle sanding process time, and the processing efficiency is improved, can cool down and clear away the convenient device of its surperficial adnexed sweeps again to the door handle, through convenient device, can be when sanding machine goes on the door handle on the manipulator, transfer the next door handle of waiting to polish to sanding machine department, avoided the manipulator to make a round trip to get and put the door handle, a large amount of time has been saved, thereby it is long when effectively reducing the process of polishing, the efficiency of polishing is improved, can carry out deashing and radiating action to the door handle that polishes simultaneously, the cleanliness of door handle is improved, reduce operational environment intensification rate and the handheld door handle operation of workman of being convenient for.

Preferably, convenient device includes the fixed plate, the fixed plate is equipped with two, and the symmetry is established in the conveyer belt both sides, be equipped with first electric telescopic handle on the fixed plate, first electric telescopic handle's output is fixed with the catch plate, and two catch plate symmetries are located the tray both sides, the conveyer belt side is equipped with the conveyer device that is convenient for with treating the door handle conveying to sanding machine department of polishing on the tray, is convenient for with being used for holding the position of the door handle of polishing and the next position of treating the door handle of polishing on the tray and remove to the appointed place, and subsequent clamp of being convenient for is got and is placed.

Preferably, conveyer includes the hydro-cylinder, the hydro-cylinder bottom is fixed between conveyer belt and arm, and the top is fixed with the connecting plate, be fixed with first motor on the connecting plate, the output of first motor is fixed with the rotor plate, be equipped with the auxiliary device who is used for receiving the door handle that the arm was polished and the door handle that the centre gripping was treated to polish on the rotor plate, reciprocate when being convenient for drive the rotor plate pivoted to be convenient for transfer the door handle that is located a place of low to the sanding machine department that is located another place of eminence.

Preferably, the auxiliary device comprises a supporting plate, the supporting plate is fixed at one end of the rotating plate far away from the oil cylinder, an opening is arranged on the supporting plate, a placing frame for placing the polished door handle is fixed at the top of the supporting plate, the placing frame is positioned above the opening, a sliding groove is arranged at one side of the bottom of the supporting plate, a sliding plate for blocking the bottom end of the opening is arranged in the sliding groove, a connecting rod is arranged on the sliding plate, a second electric telescopic rod is arranged on the supporting plate, a first notch is arranged at one side of the supporting plate, one end of the connecting rod is fixed with the sliding plate, the other end of the connecting rod penetrates through the first notch to be fixed with the output end of the second electric telescopic rod, a blowing device for conveniently dissipating heat of the polished door handle and removing scraps attached to the surface of the polished door handle is arranged at one side of the placing frame, a clamping device for clamping the polished door handle is arranged on the supporting plate, the door handle that the arm will be polished of being convenient for is placed in the frame of placing that is located sanding machine department, forwards it again and places in the standing groove of tray.

Preferably, clamping device includes the centre gripping bottom plate, the centre gripping bottom plate is located the one end of keeping away from the rotor plate, and centre gripping bottom plate tip one side is fixed with the centre gripping arm, the centre gripping arm is equipped with two, is located door handle symmetry side respectively, is fixed with the turning block on another centre gripping arm, the turning block rotates with the centre gripping bottom plate to be connected, be equipped with the telescoping device who is convenient for drive centre gripping bottom plate and reciprocate in the backup pad, be equipped with on the turning block and be convenient for drive turning block and centre gripping arm pivoted power device, be convenient for treat the door handle of polishing and carry out the centre gripping and transfer to sanding machine department.

Preferably, power device includes the riser, the riser is fixed and is kept away from the one end of centre gripping arm on the turning block, and is equipped with the elongated hole on the riser, the movable rod is worn to be equipped with in the activity of elongated hole, movable rod one end is fixed with third electric telescopic handle, and the other end passes the elongated hole and is fixed with the stopper, is convenient for drive the centre gripping arm and cliies the door handle of treating polishing.

Preferably, blast apparatus includes the fixed block, the fixed block is fixed in the backup pad, and is fixed with the second motor on the fixed block, the output of second motor is equipped with the fan of blowing, the fan of blowing is located places frame one side, it is equipped with a plurality of ventilation holes to place on the frame, can accelerate the heat dissipation of door handle and effectively blow off its surperficial adnexed sweeps.

Preferably, the telescopic device comprises a U-shaped plate, a second notch is formed in one end, away from the rotating plate, of the supporting plate, the U-shaped plate is fixed to the supporting plate and located above the second notch, a through hole is formed in the U-shaped plate, a fourth electric telescopic rod is fixed to the U-shaped plate, an output end of the fourth electric telescopic rod penetrates through the through hole and the second notch in sequence and is fixed with a connecting block, the connecting block is fixed to a clamping bottom plate, the clamping arm can be driven to move downwards, the clamping arm can clamp the lower portion of the door handle as far as possible, and the door handle can be grabbed by the mechanical arm through clamping of the top of the door handle.

Preferably, the first electric telescopic rod, the second electric telescopic rod, the third electric telescopic rod and the fourth electric telescopic rod are arranged to be electric push rods, the structure is simple, and the operation is convenient.

Preferably, a protective pad is arranged on one side of the clamping arm close to the door handle, so that the door handle between the two clamping arms cannot fall off or be sunk due to the tight clamping.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, through the convenient device, when the door handle on the manipulator is polished by the polishing machine, the next door handle to be polished is transferred to the polishing machine, so that the door handle is prevented from being taken and placed back and forth by the manipulator, a large amount of time is saved, the polishing process time is effectively reduced, the polishing efficiency is improved, and meanwhile, the ash removal and heat dissipation effects can be performed on the polished door handle, so that the cleanliness of the door handle is improved, the temperature rise rate of a working environment is reduced, and the door handle can be conveniently held by a worker.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a top view of the structure of the present invention;

FIG. 3 is a bottom view of a portion of the present invention;

FIG. 4 is a schematic view of a conventional door handle;

FIG. 5 is a schematic view of a portion of the transmission of the present invention;

FIG. 6 is an enlarged view taken at A in FIG. 1;

fig. 7 is an enlarged view of fig. 2 at B.

In the figure: 1-a conveyor belt; 2-a door handle; 3-a tray; 4-a convenient device; 5, fixing a plate; 6-a first electric telescopic rod; 7-pushing the board; 8-a transfer device; 9-oil cylinder; 10-a connecting plate; 11-a first electric machine; 12-a rotating plate; 13-an auxiliary device; 14-a support plate; 15-placing a frame; 16-a chute; 17-a slide plate; 18-a connecting rod; 19-a second electric telescopic rod; 20-a first notch; 21-an air blowing device; 22-a clamping device; 23-clamping the bottom plate; 24-a gripper arm; 25-a turning block; 26-a telescopic device; 27-a power plant; 28-elongated hole; 29-a third electric telescopic rod; 30-a limiting block; 31-fixing block; 32-a second motor; 33-a blower fan; 34-a vent hole; a 35-U shaped plate; 36-a second notch; 37-a fourth electric telescopic rod; 38-connecting block; 39-electric push rod; 40-a protective pad; 41-vertical plate.

Detailed Description

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, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, the present invention provides a technical solution: the utility model provides an automatic sanding machine of door handle, includes conveyer belt 1 and door handle 2, be equipped with the tray 3 that is used for placing door handle 2 on the

conveyer belt

1, 1 departments of conveyer belt are equipped with and can enough improve machining efficiency to effectively reducing door handle 2 sanding process time, can cool down and clear away convenient device 4 of its adnexed sweeps in surface to door handle 2 again.

Convenient device 4 includes fixed plate 5, fixed plate 5 is equipped with two, and the symmetry is established in 1 both sides of conveyer belt, be equipped with first electric telescopic handle 6 on the fixed plate 5, first electric telescopic handle 6's output is fixed with catch plate 7, and two catch plate 7 symmetries are located 3 both sides of tray, promote the back-and-forth movement of conveyer belt 1 through two first drive push rods to the left and right sides promotion of tray 3, are convenient for with the position that is used for holding door handle 2 polished on the tray 3 and the position that the door handle 2 was treated to polish next and move to appointed place, are convenient for subsequent clamp to get and place.

Conveyer belt 1 side is equipped with the conveyer 8 that is convenient for convey the door handle 2 of waiting to polish on tray 3 to sanding machine department, conveyer 8 includes hydro-cylinder 9, hydro-cylinder 9 bottom is fixed between conveyer belt 1 and arm, and the top is fixed with connecting plate 10, be fixed with first motor 11 on the connecting plate 10, the output of first motor 11 is fixed with rotor plate 12, drives rotor plate 12 through hydro-cylinder 9 and reciprocates, drives rotor plate 12 through second motor 32 and rotates when reciprocating, is convenient for transfer the door handle 2 that is located a place of low to the sanding machine department that is located another place of eminence.

The rotating plate 12 is provided with a door handle 2 polished by a mechanical arm and an auxiliary device 13 for clamping the door handle 2 to be polished, the auxiliary device 13 comprises a supporting plate 14, the supporting plate 14 is fixed at one end of the rotating plate 12 far away from the oil cylinder 9, an opening is arranged on the supporting plate 14, a placing frame 15 for placing the polished door handle 2 is fixed at the top of the supporting plate 14, the placing frame 15 is positioned above the opening, one side of the bottom of the supporting plate 14 is provided with a sliding groove 16, a sliding plate 17 for blocking the bottom end of the opening is arranged in the sliding groove 16, a connecting rod 18 is arranged on the sliding plate 17, the supporting plate 14 is provided with a second electric telescopic rod 19, one side of the supporting plate 14 is provided with a first notch 20, one end of the connecting rod 18 is fixed with the sliding plate 17, the other end of the connecting rod passes through the first notch 20 to be fixed with the output end of the second electric telescopic rod 19, and passes through the opening, the sliding plate 17 and the placing frame 15, can carry out spacing support to the door handle 2 that polishes to be convenient for put down the back at manipulator with door handle 2 and transmit it and place in the standing groove of tray 3, avoid the manipulator directly to rotate 3 departments of tray, thereby reduce the time of the process of polishing.

The air blowing device 21 is arranged on one side of the placing frame 15 and is convenient for dissipating heat of the polished door spanner and removing scraps attached to the surface of the door spanner, the air blowing device 21 comprises a fixing block 31, the fixing block 31 is fixed on the supporting plate 14, a second motor 32 is fixed on the fixing block 31, an output end of the second motor 32 is provided with an air blowing fan 33, the air blowing fan 33 is positioned on one side of the placing frame 15, a plurality of vent holes 34 are formed in the placing frame 15, the flow speed of air near the door handle 2 can be accelerated through an air blower, so that heat on the door handle 2 is taken away through indoor air having temperature difference with the door handle 2, the indoor hot air is exhausted through an exhaust fan, heat dissipation of the door handle 2 is accelerated, heat brought to the outside of a processing chamber by the door handle 2 is reduced, the temperature rising speed of an outdoor worker workshop is further reduced, and scraps attached to the surface of the door handle can be effectively blown away through air blowing, the cleanliness of the door handle 2 is improved.

The supporting plate 14 is provided with a clamping device 22 for clamping the door handle 2 to be polished, the clamping device 22 comprises a clamping bottom plate 23, the clamping bottom plate 23 is located at one end far away from the rotating plate 12, clamping arms 24 are fixed on one side of the end part of the clamping bottom plate 23, the two clamping arms 24 are respectively located on the symmetrical sides of the door handle 2, a rotating block 25 is fixed on the other clamping arm 24, the rotating block 25 is rotatably connected with the clamping bottom plate 23, and the door handle 2 to be polished can be clamped conveniently

The supporting plate 14 is provided with a telescopic device 26 which is convenient for driving the clamping bottom plate 23 to move up and down, the telescopic device 26 comprises a U-shaped plate 35, one end, away from the rotating plate 12, of the supporting plate 14 is provided with a second notch 36, the U-shaped plate 35 is fixed on the supporting plate 14 and located above the second notch 36, the U-shaped plate 35 is provided with a through hole, and the rotating bottom plate is convenient to move to a position flush with the supporting plate 14 through the through hole and the U-shaped plate 35, so that when the door handle 2 in the placing groove is placed into the tray 3, the door handle 2 is prevented from dropping to the outside due to the fact that the distance between the clamping bottom plate 23 and the tray is large;

a fourth electric telescopic rod 37 is fixed on the U-shaped plate 35, an output end of the fourth electric telescopic rod 37 sequentially penetrates through the through hole and the second notch 36 to be fixed with a connecting block 38, the connecting block 38 is fixed with the clamping bottom plate 23, so that the clamping arm 24 is driven to move downwards, the clamping arm 24 is clamped to the lower portion of the door handle 2 as far as possible, and the mechanical arm can grab the door handle 2 through clamping with the top of the door handle 2.

The rotating block 25 is provided with a power device 27 which is convenient for driving the rotating block 25 and the clamping arm 24 to rotate, the power device 27 comprises a vertical plate 41, the vertical plate 41 is fixed at one end, far away from the clamping arm 24, of the rotating block 25, a long hole 28 is formed in the vertical plate 41, a movable rod is movably arranged in the long hole 28 in a penetrating mode, one end of the movable rod is fixedly provided with a third electric telescopic rod 29, the other end of the movable rod penetrates through the long hole 28 and is fixedly provided with a limiting block 30, the rotating block 12 and the clamping arm 24 are driven to rotate through the extension and retraction of a third electric push rod 39, and the clamping arm 24 is further driven to clamp the door handle 2 to be polished.

The first electric telescopic rod 6, the second electric telescopic rod 19, the third electric telescopic rod 29 and the fourth electric telescopic rod 37 are electric push rods 39, so that the structure is simple and the operation is convenient;

in order to facilitate the stretching of the connecting structure, the first electric telescopic rod 6, the second electric telescopic rod 19, the third electric telescopic rod 29 and the fourth electric telescopic rod 37 in the application can also adopt the structure with the stretching function such as the cylinder and the oil cylinder 9.

In addition, the side of the clamping arm 24 adjacent to the door handle 2 is provided with a protective pad 40, so that the door handle 2 between the two clamping arms 24 cannot fall off or be recessed due to the tight clamping.

The working principle is as follows: when a mechanical arm polishes one door handle 2, the supporting plate 14 is driven to move downwards through the oil cylinder 9, the supporting plate 14 is driven to move downwards and rotate towards the direction of the conveying belt 1 through the first motor 11, at the same time, the door handle 2 in the placing groove is subjected to heat dissipation and dust removal through the blowing fan 33 until the supporting plate 14 is positioned right above the tray 3, the tray 3 is driven to move leftwards and rightwards through the first electric telescopic rod 6 and the conveying belt 1 moves the tray 3 forwards and backwards, the placing groove to be placed with the door handle 2 on the tray 3 is positioned right below the placing frame 15, the sliding plate 17 is driven to slide to one side through the second electric telescopic rod 19, the door handle 2 in the placing frame 15 falls into the tray 3 through the opening, the tray 3 is driven to move leftwards and rightwards through the first electric telescopic rod 6 and the conveying belt 1 moves the tray 3 forwards and backwards, and forwards, and backwards, and forwards the next door handle 2 to be polished on the tray 3 is positioned right below the clamping arm 24, through fourth electric telescopic handle 37, drive centre gripping bottom plate 23 and centre gripping arm 24 and move down, door handle 2 is located between two centre gripping arms 24, through third electric telescopic handle 29, drive turning block 25 and a centre gripping arm 24 and rotate, press from both sides and get door handle 2 middle part both sides, the rotatory backup pad 14 that moves up that rethread cylinder 9 and first motor 11 taken moves to sanding machine department, the arm is polished well to await the opportune moment and gets and get and press from both sides behind door handle 2, place it in the standing groove, and snatch the top of waiting to polish door handle 2, after waiting to grasp door handle 2, through third electric telescopic handle 29, make two centre gripping arms 24 alternate segregation, promptly remove the fixed to door handle 2, then the arm snatchs away door handle 2 and polishes, so relapse.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an automatic sanding machine of door handle, includes conveyer belt (1) and door handle (2), be equipped with tray (3) that are used for placing door handle (2) on conveyer belt (1), its characterized in that: the device is characterized in that the conveying belt (1) is provided with a convenient device (4) which can effectively reduce the grinding time of the door handle (2) and improve the processing efficiency, and can cool down the door handle (2) and remove scraps attached to the surface of the door handle, the convenient device (4) comprises two fixing plates (5), the two fixing plates (5) are symmetrically arranged on two sides of the conveying belt (1), a first electric telescopic rod (6) is arranged on the fixing plate (5), the output end of the first electric telescopic rod (6) is fixed with a pushing plate (7), the two pushing plates (7) are symmetrically arranged on two sides of the tray (3), a conveying device (8) which is convenient for conveying the door handle (2) to be ground on the tray (3) to the sanding machine is arranged beside the conveying belt (1), the conveying device (8) comprises an oil cylinder (9), the bottom of the oil cylinder (9) is fixed between the conveying belt (1) and a mechanical arm, a connecting plate (10) is fixed at the top of the connecting plate (10), a first motor (11) is fixed on the connecting plate (10), a rotating plate (12) is fixed at the output end of the first motor (11), an auxiliary device (13) used for receiving a door handle (2) polished by a mechanical arm and clamping the door handle (2) to be polished is arranged on the rotating plate (12), the auxiliary device (13) comprises a supporting plate (14), the supporting plate (14) is fixed at one end, far away from the oil cylinder (9), of the rotating plate (12), an opening is formed in the supporting plate (14), a placing frame (15) used for placing the polished door handle (2) is fixed at the top of the supporting plate (14), the placing frame (15) is located above the opening, a sliding groove (16) is formed in one side of the bottom of the supporting plate (14), and a sliding plate (17) used for blocking the bottom end of the opening is arranged in the sliding groove (16), the door handle polishing device is characterized in that a connecting rod (18) is arranged on the sliding plate (17), a second electric telescopic rod (19) is arranged on the supporting plate (14), a first notch (20) is formed in one side of the supporting plate (14), one end of the connecting rod (18) is fixed to the sliding plate (17), the other end of the connecting rod penetrates through the first notch (20) and is fixed to the output end of the second electric telescopic rod (19), a blowing device (21) which is convenient for dissipating heat of a polished door handle and removing scraps attached to the surface of the polished door handle is arranged on one side of the placing frame (15), a clamping device (22) used for clamping the door handle (2) to be polished is arranged on the supporting plate (14), the blowing device (21) comprises a fixing block (31), the fixing block (31) is fixed to the supporting plate (14), a second motor (32) is fixed to the fixing block (31), and a blowing fan (33) is arranged at the output end of the second motor (32), the blowing fan (33) is located on one side of the placing frame (15), and a plurality of ventilation holes (34) are formed in the placing frame (15).

2. The automatic sanding machine of door handle as claimed in claim 1, characterized in that: the clamping device (22) comprises a clamping bottom plate (23), the clamping bottom plate (23) is located at one end far away from the rotating plate (12), two clamping arms (24) are fixed on one side of the end portion of the clamping bottom plate (23), the two clamping arms (24) are respectively located on the symmetrical sides of the door handle (2), a rotating block (25) is fixed on the other clamping arm (24), the rotating block (25) is rotatably connected with the clamping bottom plate (23), a telescopic device (26) convenient for driving the clamping bottom plate (23) to move up and down is arranged on the supporting plate (14), and a power device (27) convenient for driving the rotating block (25) and the clamping arms (24) to rotate is arranged on the rotating block (25).

3. An automatic sanding machine for door handles according to claim 2, characterized in that: power device (27) include riser (41), riser (41) are fixed and are kept away from the one end of centre gripping arm (24) on turning block (25), and are equipped with elongated hole (28) on riser (41), the movable rod is worn to be equipped with by elongated hole (28) internalization, movable rod one end is fixed with third electric telescopic handle (29), and the other end passes elongated hole (28) and is fixed with spacing piece (30).

4. An automatic sanding machine for door handles according to claim 2, characterized in that: telescoping device (26) include U-shaped board (35), the one end that rotor plate (12) were kept away from in backup pad (14) is equipped with second breach (36), U-shaped board (35) are fixed on backup pad (14), are located second breach (36) top, and are equipped with the through-hole on U-shaped board (35), be fixed with fourth electric telescopic handle (37) on U-shaped board (35), the output of fourth electric telescopic handle (37) passes through-hole and second breach (36) in proper order and is fixed with connecting block (38), connecting block (38) are fixed with centre gripping bottom plate (23).

5. An automatic sanding machine for door handles as defined in claim 4 wherein: the first electric telescopic rod (6), the second electric telescopic rod (19), the third electric telescopic rod (29) and the fourth electric telescopic rod (37) are electric push rods (39).

6. An automatic sanding machine for door handles according to claim 2, characterized in that: and a protective pad (40) is arranged on one side of the clamping arm (24) close to the door handle (2).