CN113492172B

CN113492172B - Sheet metal punching device

Info

Publication number: CN113492172B
Application number: CN202111061702.7A
Authority: CN
Inventors: 吴忠华
Original assignee: Jiangsu Yuzhuo Special Doors And Windows Co ltd
Current assignee: Jiangsu Yuzhuo Special Doors And Windows Co ltd
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2021-11-09
Anticipated expiration: 2041-09-10
Also published as: CN113492172A

Abstract

The invention discloses a metal plate punching device which comprises a base, a cross beam, a limiting component and a punching component, wherein two sides of the top of the base are provided with stand columns, the top of each stand column is provided with the cross beam, the bottom of the cross beam is provided with the punching component, the bottom of the punching component is provided with a replaceable punching head, a second through groove is arranged on the base in a penetrating way, the limiting component is arranged in the second through groove, the base is provided with a supporting component, the supporting component is matched with a feeding component in a sliding way, a metal plate is arranged in the feeding component in a penetrating way, holes with different pore diameters can be punched on the metal plate when the punching component presses down, the metal plate can flexibly move between the limiting component and the replaceable punching head under the matching of the supporting component and the feeding component, holes with different sizes can be punched at different positions on the metal plate, and secondary installation and positioning are not needed, so that the position precision among all holes of the metal plate is improved.

Description

Sheet metal punching device

Technical Field

The invention relates to the technical field of metal processing, in particular to a metal plate punching device.

Background

Sheet metal has different requirements in different environments. To meet special needs, workers need to perform different treatments on the board. The metal plate stamping is to shear redundant metal on the metal plate to form a hole through a stamping die, and generally, the metal plate is placed between a stamping head and the die to be extruded, so that the metal plate is deformed, but sometimes, a plurality of holes with different hole diameters are required on one metal plate.

In the prior art, a plurality of holes with different apertures are punched by replacing a stamping die and disassembling, repositioning and installing a metal plate, but frequent disassembly can result in poor position accuracy among the holes and low efficiency.

Disclosure of Invention

The present invention is directed to a punching apparatus for metal plate, so as to solve the problems of the prior art.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention conventionally use, which are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, or be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

The embodiment of the invention discloses a metal plate punching device which comprises a base, a cross beam, a limiting assembly and a punching assembly, wherein two sides of the top of the base are provided with stand columns, the top of each stand column is provided with the cross beam, the bottom of each cross beam is provided with the punching assembly, the bottom of each punching assembly is provided with a replaceable punching head, a second through groove penetrates through the base, the limiting assembly is arranged in the second through groove, the base is provided with a supporting assembly, the supporting assembly is matched with a feeding assembly in a sliding mode, and a metal plate is arranged in the feeding assembly in a penetrating mode.

Preferably, the supporting component comprises a supporting platform, a supporting rod and a first telescopic rod, the supporting platform is located between the base and the cross beam, the supporting rod penetrates through the supporting platform and is fixedly installed on the base, the extending plate is installed at the top of the supporting rod, and the first telescopic rod is installed between the extending plate and the supporting platform.

Preferably, a pair of baffles is installed on two sides of the supporting platform, the baffles are parallel to each other, the supporting platform is provided with a feeding assembly in a sliding fit mode, a second telescopic rod is connected between the feeding assembly and the baffles, the feeding assembly is used for actively feeding the metal plates, the direction of the feeding assembly for actively feeding the metal plates is perpendicular to the direction of the second telescopic rod in a stretching mode, the active feeding of the feeding assembly is matched with the stretching of the second telescopic rod in a stretching mode, and a first through groove is formed in the supporting platform.

Preferably, the feeding assembly comprises a clamping block, a roller and a first motor, one side of the clamping block is connected with the second telescopic rod, one side of the clamping block, far away from the second telescopic rod, is provided with a guide groove and a sliding groove, the guide groove is positioned at the bottom of the sliding groove, a metal plate is arranged in the guide groove in a sliding fit mode, the sliding groove is internally provided with a sliding block in a sliding fit mode, the roller is installed between the sliding blocks in the clamping blocks on two sides in a rotating mode, a connecting rod is installed at the top of the sliding block, the connecting rod is in sliding fit with the clamping block, the first motor is installed at the top of the connecting rod, a first spring is installed on the connecting rod in a rotating mode, the first spring is positioned in the sliding groove, a transmission gear is installed on the roller, a driving gear is installed at the output end of the first motor, and the driving gear is matched with the transmission gear in a transmission mode.

Preferably, the outer side of the roller is provided with a rubber coating, steel balls are embedded in the top and the bottom of the guide groove, and the steel balls are in sliding fit with the metal plate.

Preferably, the punching press subassembly includes box, hydraulic push rod and second motor, the box is installed in the bottom of crossbeam, hydraulic push rod is installed to the bottom of crossbeam, and the bottom of box is provided with the through-hole, runs through in the through-hole and is provided with hydraulic push rod, install the second motor on the box, the output of second motor passes through the axis of rotation and is connected with the interchangeable punching press head.

Preferably, the interchangeable punching press head is including installation disc, uide bushing and stamping rod, the installation disc passes through the rotation axis with the second motor and is connected, the bottom circumference of installation disc is provided with a plurality of groups uide bushing, uide bushing's bottom is provided with telescopic hole, and the cavity intercommunication on uide bushing and the installation disc, sliding fit has the guide block in the uide bushing, and stamping rod is installed to the bottom of guide block, stamping rod and telescopic hole sliding fit, the last second spring of installing of rotating of stamping rod.

Preferably, the bottom of the box body is fixedly provided with a limiting cylinder, and the mounting disc is in running fit with the limiting cylinder.

Preferably, the limiting assembly comprises a limiting ring, a limiting sleeve and a limiting rod, the limiting ring is fixedly mounted in the second through groove, a plurality of groups of limiting sleeves with different calibers are arranged on the inner side of the limiting ring, the limiting sleeves are in sliding fit with each other, the second through groove is provided with an elastic reset assembly, the elastic reset assembly is located at the bottoms of the limiting ring and the limiting sleeve, limiting holes are formed in the limiting ring and the limiting sleeve, the limiting holes are in sliding fit with the limiting rod, a mounting groove is formed in one side, close to the second through groove, of the limiting ring, a third telescopic rod is mounted in the mounting groove, a push plate is mounted at the free end of the third telescopic rod, and the push plate is connected with the limiting rod.

Preferably, the elastic reset assembly comprises a fixing plate, a first guide rod and a fixing block, the fixing plate is in sliding fit with the second through groove, the fixing plate is located at the bottoms of the limiting ring and the limiting sleeve, the first guide rod is installed at the bottom of the fixing plate, the fixing block is installed in the second through groove, the first guide rod is in sliding fit with the fixing block, a third spring is installed on the first guide rod in a rotating mode, and the ejection assembly is installed on the fixing plate.

Preferably, the ejection assembly comprises a second guide rod, a limiting disc and a fourth spring, a cylindrical sleeve is fixedly mounted on the fixing plate, the second guide rod is in sliding fit in the cylindrical sleeve, the limiting disc is mounted on two sides of the second guide rod, a limiting flange is mounted on the second guide rod, the fourth spring is arranged between the limiting flange and the cylindrical sleeve, and the fourth spring is in running fit with the second guide rod.

Preferably, the tops of the cross sections of the limiting ring and the limiting sleeve are inclined downward slopes.

Preferably, be provided with blanking groove and relief hole on the base, blanking groove's bottom and relief hole intercommunication, the backing plate is installed to the bottom of base.

Compared with the prior art, through the combination of spacing subassembly and interchangeable punching press head, can punch out the hole of different aperture sizes to sheet metal when the punching press subassembly pushes down, under the cooperation of supporting component with the subassembly that feeds, can make sheet metal nimble removal between spacing subassembly and interchangeable punching press head, can realize that different positions punch out the hole of equidimension on sheet metal, do not need the secondary installation location, improved the position accuracy between each hole of sheet metal.

Drawings

Fig. 1 is a schematic view of a punching apparatus for metal plate according to the present invention.

Fig. 2 is a schematic view of a supporting platform in the punching apparatus for metal plate according to the present invention.

FIG. 3 is a schematic view of an alternative punch head of the punching apparatus for metal sheets according to the present invention.

Fig. 4 is a schematic view of a region a of a punching apparatus for metal plate according to the present invention.

Fig. 5 is a schematic view of a region B of a punching apparatus for metal sheets according to the present invention.

Reference numerals:

1-a base, 2-a cross beam, 3-a support component, 31-a support platform, 32-a support rod, 33-an extension plate, 34-a first telescopic rod, 35-a baffle, 36-a second telescopic rod, 37-a first through groove, 4-a feeding component, 40-a transmission gear, 41-a clamping block, 42-a roller, 43-a guide groove, 44-a sliding groove, 45-a sliding block, 46-a connecting rod, 47-a first spring, 48-a first motor, 49-a driving gear, 5-a limiting component, 51-a limiting ring, 52-a limiting sleeve, 53-a limiting hole, 54-a mounting groove, 55-a third telescopic rod, 56-a push plate, 57-a limiting rod, 6-a stamping component and 61-a box body, 62-hydraulic push rod, 63-through hole, 64-second motor, 65-limit cylinder, 7-replaceable punch head, 71-mounting disc, 72-guide sleeve, 73-guide block, 74-punch rod, 75-second spring, 8-elastic reset component, 81-fixing plate, 82-first guide rod, 83-fixing block, 84-third spring, 85-second guide rod, 86-limit disc, 87-cylindrical sleeve, 88-limit flange, 89-fourth spring, 11-second through groove, 12-blanking groove, 13-discharge hole, 14-backing plate and 15-upright post.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Examples

As shown in fig. 1, a metal plate punching device comprises a base 1, a beam 2, a limiting component 5 and a punching component 6, wherein two sides of the top of the base 1 are provided with an upright post 15, the top of the upright post 15 is provided with the beam 2, the bottom of the beam 2 is provided with the punching component 6, the bottom of the punching component 6 is provided with an interchangeable punching head 7, holes with different calibers can be punched on the metal plate by matching the rotation of the interchangeable punching head 7 with the punching in the vertical direction of the punching component 6, the base 1 is provided with a second through groove 11 in a penetrating way, the limiting component 5 is arranged in the second through groove 11, the holes with different calibers can be punched by matching the downward punching component 6 and the interchangeable punching head 7 through the telescopic adjustment of the limiting component 5, the base 1 is provided with a supporting component 3, the supporting component 3 is provided with a feeding component 4 in a sliding way, the feeding component 4 is provided with the metal plate in a penetrating way, through the lifting adjustment of supporting component 3 and feed subassembly 4 and initiatively feed sheet metal, can realize punching a hole in succession to sheet metal, at the rotation of interchangeable punching press head 7 and spacing subassembly 5's flexible regulation regulating action, can realize punching a hole of different bores in succession in sheet metal different positions, reduced the error that the secondary installation adjustment brought, improved the efficiency of punching a hole and the position accuracy between the hole of punching a hole greatly.

As shown in fig. 1, 2 and 5, the supporting assembly 3 comprises a supporting platform 31, a supporting rod 32 and a first telescopic rod 34, the supporting platform 31 is positioned between the base 1 and the beam 2, the supporting rods 32 are arranged on the supporting platform 31 in a penetrating way, the supporting rods 32 are fixedly arranged on the base 1, an extension plate 33 is installed on the top of the support rod 32, a first expansion link 34 is installed between the extension plate 33 and the support platform 31, the support platform 31 can be lifted in the vertical direction by the extension and contraction of the first telescopic rod 34, the distance between the metal plate in the feeding assembly 4 and the limiting assembly 5 can be adjusted, so that the metal plate can be tightly attached to the top of the limiting assembly 5, make sheet metal can not take place to buckle among the stamping process, improve the quality of punching a hole for the shearing efficiency to sheet metal among the stamping process is high, and the panel after punching a hole does not have burr and arch.

A pair of baffles 35 are arranged on two sides of the supporting platform 31, the baffles 35 are parallel to each other, the feeding component 4 is slidably fitted on the supporting platform 31, a second telescopic rod 36 is connected between the feeding component 4 and the baffle 35, the feeding component 4 can be driven to slide left and right on the supporting platform 31 by the active extension and retraction of the second telescopic rod 36, the position of the sheet material on the supporting platform 31 can be adjusted, the feeding component 4 is used for actively feeding the sheet metal, the direction of the feeding component 4 actively feeding the sheet metal is mutually vertical to the stretching direction of the second telescopic rod 36, the active feeding of the feeding component 4 is matched with the stretching of the second telescopic rod 36, the position of the metal plate relative to the supporting platform 31 can be flexibly adjusted, continuous punching at multiple positions can be realized, and the supporting platform 31 is provided with the first through groove 37, so that the metal plate can be in direct contact with the limiting assembly 5.

The feeding assembly 4 comprises a clamping block 41, a roller 42 and a first motor 48, one side of the clamping block 41 is connected with the second telescopic rod 36, one side, far away from the second telescopic rod 36, of the clamping block 41 is provided with a guide groove 43 and a sliding groove 44, the guide groove 43 is positioned at the bottom of the sliding groove 44, a metal plate is matched in the guide groove 43 in a sliding manner, a sliding block 45 is matched in the sliding groove 44 in a sliding manner, the roller 42 is rotatably installed between the sliding blocks 45 in the clamping blocks 41 on two sides, a connecting rod 46 is installed at the top of the sliding block 45, the connecting rod 46 is matched with the clamping block 41 in a sliding manner, the first motor 48 is installed at the top of the connecting rod 46, a first spring 47 is rotatably installed on the connecting rod 46, the first spring 47 is positioned in the sliding groove 44, so that the sliding blocks 45 and the roller 42 have a downward moving tendency, and a transmission gear 40 is installed on the roller 42, the output end of the first motor 48 is provided with a driving gear 49, the driving gear 49 is in transmission fit with the transmission gear 40, the rotation of the first motor 48 can drive the roller 42 tightly attached to the metal plate to rotate, the metal plate is actively fed, and the connecting rod 46 is connected with the first motor 48 and the sliding block 45, so that the roller 42 can press the metal plate and simultaneously keep good transmission between the driving gear 49 and the transmission gear 40.

The rubber coating is arranged on the outer side of the roller 42 and can increase the friction force between the roller 42 and the metal plate, steel balls are embedded in the top and the bottom of the guide groove 43 and are in sliding fit with the metal plate, so that the resistance of the metal plate when the metal plate slides in the guide groove 43 is reduced, and the metal plate and the roller 42 can be prevented from sliding relatively when the metal plate is actively fed.

As shown in fig. 1, the punching assembly 6 includes a box 61, a hydraulic push rod 62 and a second motor 64, the box 61 is installed at the bottom of the cross beam 2, the hydraulic push rod 62 is installed at the bottom of the cross beam 2, a through hole 63 is formed in the bottom of the box 61, the hydraulic push rod 62 penetrates through the through hole 63, the second motor 64 is installed on the box 61, the output end of the second motor 64 is connected with the replaceable punching head 7 through a rotating shaft, and punching operations with different aperture sizes can be performed in a convertible manner through rotation of the replaceable punching head 7.

As shown in fig. 3, the replaceable punch head 7 includes an installation disc 71, a guide sleeve 72 and a punch rod 74, the installation disc 71 is connected with the second motor 64 through a rotation shaft, a plurality of sets of guide sleeves 72 are circumferentially arranged at the bottom of the installation disc 71, a telescopic hole is formed in the bottom of each guide sleeve 72, each guide sleeve 72 is communicated with a hollow hole in the installation disc 71, a guide block 73 is in sliding fit with each guide sleeve 72, the punch rod 74 is installed at the bottom of each guide block 73, the punch rod 74 is in sliding fit with the telescopic hole, a second spring 75 is rotatably installed on the punch rod 74, and when the guide sleeve 72 rotates to the bottom of the hydraulic push rod 62 under the power action of the second motor 64, the hydraulic push rod 62 is pressed on the through hole 63 and applies a force downwards, so that the punch rod 74 can extend out of the guide sleeve 72 to perform a punching operation.

As shown in fig. 1, a limiting cylinder 65 is fixedly installed at the bottom of the box 61, and the installation disc 71 is rotatably matched with the limiting cylinder 65, so that the installation disc 71 can be prevented from deflecting when the hydraulic push rod 62 presses the through hole 63 and the second motor 64.

As shown in fig. 4, the limiting component 5 includes a limiting ring 51, a limiting sleeve 52 and a limiting rod 57, the limiting ring 51 is fixedly installed in the second through groove 11, a plurality of sets of limiting sleeves 52 with different calibers are arranged on the inner side of the limiting ring 51, the limiting sleeves 52 are mutually matched in a sliding manner, an elastic reset component 8 is installed in the second through groove 11, the elastic reset component 8 is located at the bottoms of the limiting ring 51 and the limiting sleeve 52 and can provide support for the spatial position of the limiting sleeve 52 in the limiting ring 51, so that the limiting sleeve 52 does not fall into the second through groove 11, limiting holes 53 are arranged in the limiting ring 51 and the limiting sleeve 52, the limiting rod 57 is matched in the limiting holes 53 in a sliding manner, the number of the limiting sleeves 52 connected with the limiting ring 51 can be limited by the sliding of the limiting rod 57 in the limiting holes 53, thereby forming mold cavities with different calibers, can cooperate the not punching press pole 74 of same bore size to punch a hole to sheet metal, the punching press pole 74 of different bore size can realize punching out the hole of different bore sizes on sheet metal in the not spacing sleeve 52 of same bore size of impressing, and the one side that is close to second through groove 11 on the spacing ring 51 is provided with mounting groove 54, installs third telescopic link 55 in the mounting groove 54, and push pedal 56 is installed to the free end of third telescopic link 55, push pedal 56 is connected with gag lever post 57, and the flexible different length of third telescopic link 55 can be realized controlling the quantity that spacing ring 51 and spacing sleeve 52 are connected.

The elastic resetting component 8 comprises a fixing plate 81, a first guide rod 82 and a fixing block 83, the fixing plate 81 is in sliding fit in the second through groove 11, the fixing plate 81 is located at the bottoms of the limiting ring 51 and the limiting sleeve 52, the first guide rod 82 is installed at the bottom of the fixing plate 81, the fixing block 83 is installed in the second through groove 11, the first guide rod 82 is in sliding fit with the fixing block 83, a third spring 84 is rotatably installed on the first guide rod 82, under the elastic supporting action of the third spring 84, the limiting sleeve 52 which is not limited by the limiting rod 57 can enable the limiting sleeve 52 which is not limited by the limiting rod 57 to move downwards along with the fixing plate 81 when the stamping rod 74 is pressed into the limiting sleeve 52, and an ejection component is installed on the fixing plate 81 and can eject the metal sheet which is pressed into the limiting sleeve 52 by the stamping rod 74 out of the limiting sleeve 52.

The ejection assembly comprises a second guide rod 85, a limiting disc 86 and a fourth spring 89, a cylindrical sleeve 87 is fixedly mounted on the fixing plate 81, the second guide rod 85 is in sliding fit with the cylindrical sleeve 87, the limiting disc 86 is mounted on two sides of the second guide rod 85, a limiting flange 88 is mounted on the second guide rod 85, the fourth spring 89 is arranged between the limiting flange 88 and the cylindrical sleeve 87, the fourth spring 89 is in rotating fit with the second guide rod 85, the metal gasket can be pressed into the limiting sleeve 52 along with the stamping rod 74, the fourth spring 89 contracts and moves downwards along with the limiting disc 86, and when the stamping rod 74 is lifted upwards, the limiting disc 86 bounces upwards and ejects the metal sheet out of the limiting sleeve 52 under the action of the fourth spring 89.

The tops of the cross sections of the limiting ring 51 and the limiting sleeve 52 are inclined downward slopes, and the metal sheet can slide downward along the slopes after being ejected out of the limiting sleeve 52.

As shown in fig. 1, a blanking groove 12 and a discharge hole 13 are arranged on a base 1, the bottom of the blanking groove 12 is communicated with the discharge hole 13, metal sheets sliding down from a limiting sleeve 52 and a limiting ring 51 fall down through the blanking groove 12 and the discharge hole 13, a backing plate 14 is arranged at the bottom of the base 1, and the backing plate 14 can conveniently fix the position of the base 1.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.

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

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a sheet metal punching device, includes base (1), crossbeam (2), spacing subassembly (5) and punching press subassembly (6), its characterized in that, stand (15) are installed to the top both sides of base (1), and crossbeam (2) are installed at the top of stand (15), and punching press subassembly (6) are installed to the bottom of crossbeam (2), and interchangeable punching press head (7) are installed to the bottom of punching press subassembly (6), run through on base (1) and be provided with second through groove (11), install spacing subassembly (5) in second through groove (11), install supporting component (3) on base (1), sliding fit has feeding subassembly (4) on supporting component (3), and feeding subassembly (4) run through and be provided with sheet metal, spacing subassembly (5) include spacing ring (51), spacing sleeve (52) and gag lever post (57), the limiting ring (51) is fixedly arranged in the second through groove (11), a plurality of groups of limiting sleeves (52) with different calibers are arranged on the inner side of the limiting ring (51), the limiting sleeves (52) are mutually matched in a sliding manner, the second through groove (11) is internally provided with an elastic resetting component (8), the elastic resetting component (8) is positioned at the bottoms of the limiting ring (51) and the limiting sleeves (52), limiting holes (53) are arranged in the limiting ring (51) and the limiting sleeve (52), limiting rod (57) is arranged in the limiting hole (53) in a sliding fit mode, an installation groove (54) is formed in one side, close to the second through groove (11), of the limiting ring (51), a third telescopic rod (55) is installed in the installation groove (54), a push plate (56) is installed at the free end of the third telescopic rod (55), and the push plate (56) is connected with the limiting rod (57).

2. A metal sheet punching device according to claim 1, wherein the support assembly (3) comprises a support platform (31), a support rod (32) and a first telescopic rod (34), the support platform (31) is located between the base (1) and the cross beam (2), the support rod (32) penetrates through the support platform (31) and is fixedly installed on the base (1), an extension plate (33) is installed at the top of the support rod (32), and the first telescopic rod (34) is installed between the extension plate (33) and the support platform (31).

3. A metal sheet punching device according to claim 2, wherein a pair of baffles (35) are mounted on two sides of the supporting platform (31), the baffles (35) are parallel to each other, the supporting platform (31) is slidably matched with the feeding assembly (4), a second telescopic rod (36) is connected between the feeding assembly (4) and the baffles (35), the feeding assembly (4) is used for actively feeding the metal sheet, the direction of the feeding assembly (4) actively feeding the metal sheet is perpendicular to the direction of the second telescopic rod (36) in a stretching manner, the active feeding of the feeding assembly (4) is matched with the stretching of the second telescopic rod (36), and a first through groove (37) is formed in the supporting platform (31).

4. A metal sheet punching device according to claim 3, wherein the feeding assembly (4) comprises a clamping block (41), a roller (42) and a first motor (48), one side of the clamping block (41) is connected with the second telescopic rod (36), one side of the clamping block (41) far away from the second telescopic rod (36) is provided with a guide groove (43) and a sliding groove (44), the guide groove (43) is located at the bottom of the sliding groove (44), the metal sheet is in sliding fit in the guide groove (43), a sliding block (45) is in sliding fit in the sliding groove (44), the roller (42) is rotatably installed between the sliding blocks (45) in the clamping blocks (41) on two sides, a connecting rod (46) is installed at the top of the sliding block (45), the connecting rod (46) is in sliding fit with the clamping block (41), the first motor (48) is installed at the top of the connecting rod (46), rotate on connecting rod (46) and install first spring (47), first spring (47) are located sliding tray (44), install drive gear (40) on cylinder (42), drive gear (49) are installed to the output of first motor (48), and drive gear (49) and drive gear (40) transmission fit.

5. A sheet metal punching apparatus according to claim 4, characterized in that the outside of the roller (42) is provided with a rubber coating, and steel balls are embedded in the top and bottom of the guide groove (43) and are in sliding fit with the sheet metal.

6. A metal plate punching device according to claim 5, characterized in that the punching assembly (6) comprises a box body (61), a hydraulic push rod (62) and a second motor (64), the box body (61) is mounted at the bottom of the cross beam (2), the hydraulic push rod (62) is mounted at the bottom of the cross beam (2), a through hole (63) is formed in the bottom of the box body (61), the hydraulic push rod (62) penetrates through the through hole (63), the second motor (64) is mounted on the box body (61), and the output end of the second motor (64) is connected with the replaceable punching head (7) through a rotating shaft.

7. A metal sheet punching device according to claim 6, wherein the replaceable punching head (7) comprises a mounting disc (71), a guide sleeve (72) and a punching rod (74), the mounting disc (71) is connected with the second motor (64) through a rotating shaft, a plurality of groups of guide sleeves (72) are circumferentially arranged at the bottom of the mounting disc (71), a telescopic hole is formed in the bottom of each guide sleeve (72), each guide sleeve (72) is communicated with a hollow hole in the mounting disc (71), a guide block (73) is slidably matched in each guide sleeve (72), the punching rod (74) is installed at the bottom of each guide block (73), the punching rod (74) is slidably matched with the telescopic hole, and a second spring (75) is rotatably installed on each punching rod (74).

8. A metal sheet punching device according to claim 7, characterized in that a limiting cylinder (65) is fixedly mounted at the bottom of the box body (61), and the mounting disc (71) is rotatably fitted with the limiting cylinder (65).

9. Sheet metal punching device according to claim 8, characterized in that the resilient return member (8)

Including fixed plate (81), first guide bar (82) and fixed block (83), fixed plate (81) sliding fit runs through groove (11) at the second in, and fixed plate (81) are located the bottom of spacing ring (51) and stop sleeve (52), and first guide bar (82) are installed to the bottom of fixed plate (81), the second runs through installs fixed block (83) in groove (11), and first guide bar (82) and fixed block (83) sliding fit rotate on first guide bar (82) and install third spring (84), install ejecting subassembly on fixed plate (81).