CN212168602U

CN212168602U - Special pneumatic quick-clamping fixture for bending machine

Info

Publication number: CN212168602U
Application number: CN202020499981.XU
Authority: CN
Inventors: 付红芝; 曹宇; 林忠
Original assignee: Noble Shanghai Industrial Automation Co ltd
Current assignee: Noble Shanghai Industrial Automation Co ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2020-12-18
Anticipated expiration: 2030-04-08

Abstract

The utility model provides a special pneumatic quick clamp for a bending machine, wherein a mould hook is positioned between a clamp splice main body and a front splint, the front side surface of the mould hook is propped against the rear side surface of the front splint, the upper part of the rear side surface is propped against the upper part of the front side surface of the clamp splice main body, and the lower part of the rear side surface is provided with a bending upper mould hook; the trailing flank of clamp splice main part is provided with the recess, the notch sets up towards the back, the piston along the portable setting of fore-and-aft direction in the recess and with the recess lateral wall sliding seal setting all around, be provided with the business turn over gas port in the clamp splice main part, the tank bottom of gas circuit intercommunication recess respectively, first connecting piece sets up along the fore-and-aft direction, the front splint is connected to the front end, the middle part is worn to establish mould couple and clamp splice main part respectively and with both equal sliding seal settings, the tank bottom of recess is worn to produce by the rear end and is connected the piston. The utility model discloses it is efficient to go up the mould in loading and unloading, labour saving and time saving, and the centre gripping is stable, can not influence the size precision of machined part, design benefit, and the structure is succinct, makes portably, and is with low costs.

Description

Special pneumatic quick-clamping fixture for bending machine

Technical Field

The utility model relates to a plate processing equipment technical field, in particular to plate equipment technical field that bends specifically indicate a special pneumatic anchor clamps that press from both sides soon of bender.

Background

The special clamp for the bending machine is a clamp which is fixed on an upper beam clamping block of the bending machine and is used for clamping an upper die. In order to diversify the metal plates in the market, the upper dies used for bending are also various, so that the replacement frequency of the upper dies is continuously improved. However, the clamps used by many enterprises are manual, and one clamp is required to be loosened, the upper die is replaced, and then the clamp is clamped, so that the efficiency is difficult to keep up with the market demand.

Therefore, the current clamp special for the bending machine mainly has the following defects:

1. the mould is loaded and unloaded with low efficiency, wastes time and energy, and can not keep up with the market demand.

2. The operator screws the clamp, possibly with errors, without clamping, which seriously affects the dimensional accuracy of the workpiece.

Therefore, it is desirable to provide a special clamp for bending machines, which has high loading and unloading upper die efficiency, time and labor saving, stable clamping and no influence on the size precision of a machined part.

SUMMERY OF THE UTILITY MODEL

In order to overcome the shortcoming among the above-mentioned prior art, an object of the utility model is to provide a special pneumatic fast anchor clamps that press from both sides of bender, it is efficient on loading and unloading, labour saving and time saving, and the centre gripping is stable, can not influence the size precision of machined part, is suitable for extensive popularization and application.

Another object of the utility model is to provide a special pneumatic anchor clamps that press from both sides soon of bender, its design benefit, the structure is succinct, makes portably, and is with low costs, is suitable for extensive popularization and application.

In order to achieve the above object, the utility model discloses a special pneumatic fast clamp of bender, its characteristics are, including clamp splice main part, front plate, piston, mould couple and first connecting piece, wherein:

the clamp block main body, the front clamping plate and the die hook are arranged along the left-right direction, the front clamping plate is positioned in front of the clamp block main body, the die hook is positioned between the clamp block main body and the front clamping plate, the front side surface of the die hook abuts against the rear side surface of the front clamping plate, the upper part of the rear side surface of the die hook abuts against the upper part of the front side surface of the clamp block main body, and the lower part of the rear side surface of the die hook is provided with a bent upper die hook for hooking a bent upper die so as to form a bent upper die clamping part between the lower part of the rear side surface of the die hook and the lower part of the front side surface of the clamp block main body;

the rear flank of clamp splice main part be provided with the recess, the notch of recess sets up towards the back, the piston is along the portable setting of fore-and-aft direction in the recess and with the lateral wall sliding seal all around of recess sets up thereby the piston with form pneumatic chamber between the recess, be provided with air inlet and gas outlet in the clamp splice main part, the air inlet with the gas outlet is gas circuit intercommunication respectively the tank bottom of recess, first connecting piece is followed the fore-and-aft direction sets up, the front end of first connecting piece is connected the front splint, the middle part of first connecting piece is worn to establish respectively the mould couple with the clamp splice main part and with the mould couple with the equal sliding seal of clamp splice main part sets up, the rear end of first connecting piece is worn to establish the tank bottom of recess and is connected the piston.

Preferably, the pneumatic quick-clamping fixture special for the bending machine further comprises a first elastic piece, and the first elastic piece is located between the front side surface of the die hook and the rear side surface of the front clamping plate and respectively abuts against the front side surface of the die hook and the rear side surface of the front clamping plate.

Preferably, the first elastic member is sleeved on the middle part of the first connecting member.

Preferably, the pneumatic quick-clamping fixture special for the bending machine further comprises a second elastic piece, one end of the second elastic piece is connected with the mold hook, and the other end of the second elastic piece is bent forwards and downwards to extend and set and then bent backwards and downwards to extend and set and abuts against the upper portion of the rear side face of the front clamping plate.

More preferably, the second elastic member is an arc-shaped spring plate.

Preferably, the mold hook is provided with a first through hole along the front-back direction, the clamp block main body is provided with a second through hole along the front-back direction, and the middle part of the first connecting piece is respectively penetrated through the first through hole and the second through hole and is in sliding sealing arrangement with the first through hole and the second through hole.

Preferably, the mould couple includes a plurality of couple units, and is a plurality of the couple unit is followed left right direction supports in proper order and leans on the setting, the middle part of first connecting piece wear to establish adjacent two position between the couple unit.

Preferably, special pneumatic quick clamp anchor clamps of bender still include the back splint, the back splint follow the left and right sides direction sets up and is located the rear of clamp splice main part and with the clamp splice main part can be dismantled and be connected, the upper portion of the leading flank of back splint support and lean on the upper portion of the trailing flank of clamp splice main part and cover at least the lower part of the notch of recess, the lower part of the leading flank of back splint be provided with thereby mould couple is gone up in bending the lower part of the leading flank of back splint with the lower part of the trailing flank of clamp splice main part between form mould clamping part is gone up in bending.

Preferably, the special pneumatic quick clamp for the bending machine further comprises a second connecting piece, and the second connecting piece sequentially penetrates through the rear clamping plate and is connected with the clamping block main body.

Preferably, special pneumatic quick clamp anchor clamps of bender still include anchor clamps wedge and third connecting piece, the anchor clamps wedge is in the left and right sides direction becomes the wedge form, the top of clamp splice main part is followed left and right sides direction is provided with L type concave part, the anchor clamps wedge is located on the tank bottom of L type concave part, the lateral wall of L type concave part is followed left and right sides direction is provided with microscler through-hole, the third connecting piece is followed the fore-and-aft direction is worn to establish microscler through-hole and is connected thereby the anchor clamps wedge will the anchor clamps wedge with the clamp splice main part is connected.

The beneficial effects of the utility model mainly lie in:

1. the utility model discloses a special pneumatic fast clamp of bender's mould couple is located between clamp splice main part and the front plate, and the leading flank of mould couple supports the trailing flank of front plate, and the upper portion of the trailing flank of mould couple supports the upper portion of the leading flank of clamp splice main part, and the lower part is provided with bends and goes up the mould couple thus form bends and goes up the mould clamping part between its and the lower part of the leading flank of clamp splice main part; the rear side surface of the clamp block main body is provided with a groove, the notch is arranged backwards, the piston is movably arranged in the groove in the front-back direction and is arranged in a sliding and sealing manner with the peripheral side wall of the groove so as to form a pneumatic chamber between the piston and the groove, the clamp block main body is provided with an air inlet and an air outlet, the air passage is communicated with the groove bottom of the groove respectively, the first connecting piece is arranged in the front-back direction, the front end of the first connecting piece is connected with a front clamping plate, the middle of the first connecting piece is respectively penetrated through the mold hook and the clamp block main body and is arranged in a sliding and sealing manner with the mold hook and the clamp block main body, and the rear end of the first connecting piece is penetrated through the groove bottom of the groove and is connected with the piston; when unloading the mould, give vent to anger through the gas outlet, gaseous the reducing in the pneumatic chamber for the piston moves forward, and splint move forward before first connecting piece promotes, loosens mould couple and clamp splice main part, thereby will bend and go up the mould and dismantle, consequently, it is efficient on the loading and unloading, labour saving and time saving, and the centre gripping is stable, can not influence the size precision of machined part, is suitable for extensive popularization and application.

2. The utility model discloses a special pneumatic fast clamp of bender's mould couple is located between clamp splice main part and the front plate, and the leading flank of mould couple supports the trailing flank of front plate, and the upper portion of the trailing flank of mould couple supports the upper portion of the leading flank of clamp splice main part, and the lower part is provided with bends and goes up the mould couple thus form bends and goes up the mould clamping part between its and the lower part of the leading flank of clamp splice main part; the rear side surface of the clamp block main body is provided with a groove, the notch is arranged backwards, the piston is movably arranged in the groove in the front-back direction and is arranged in a sliding and sealing manner with the peripheral side wall of the groove so as to form a pneumatic chamber between the piston and the groove, the clamp block main body is provided with an air inlet and an air outlet, the air passage is communicated with the groove bottom of the groove respectively, the first connecting piece is arranged in the front-back direction, the front end of the first connecting piece is connected with a front clamping plate, the middle of the first connecting piece is respectively penetrated through the mold hook and the clamp block main body and is arranged in a sliding and sealing manner with the mold hook and the clamp block main body, and the rear end of the first connecting piece is penetrated through the groove bottom of the groove and is connected with the piston; when the mold is unloaded, the air is discharged through the air outlet, the air in the pneumatic chamber is reduced, the piston moves forwards, the first connecting piece pushes the front clamping plate to move forwards, the mold hook and the clamping block main body are loosened, and the bent upper mold is disassembled.

Drawings

Fig. 1 is a schematic perspective view of a specific embodiment of the pneumatic quick-clamping fixture special for a bending machine of the present invention.

Fig. 2 is a first exploded perspective view of the embodiment shown in fig. 1.

Fig. 3 is a second perspective view of the embodiment shown in fig. 1.

Fig. 4 is an exploded perspective view of the embodiment shown in fig. 1.

Fig. 5 is a schematic front view of the embodiment shown in fig. 1.

FIG. 6 is a schematic left side perspective view of the embodiment shown in FIG. 1.

Fig. 7 is a schematic top view of the embodiment shown in fig. 1.

(symbol description)

1, a clamp block main body; 2, front splints; 3, a piston; 4, hooking the mold; 5 a first connecting piece; 6 bending the upper die hook; 7 bending the upper die clamping part; 8, grooves; 9 a pneumatic chamber; 10 air inlet; 11 air outlet; 12 a first elastic member; 13 a second elastic member; 14 a first via hole; 15 a second through hole; 16 hook units; 17 a left recess; 18 a right recess; 19 a rear splint; 20 a second connector; 21 clamping a wedge block; 22 a third connecting member; a 23L-shaped recess; 24 elongate through holes.

Detailed Description

In order to clearly understand the technical contents of the present invention, the following embodiments are specifically illustrated in detail.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1 to 7, in an embodiment of the present invention, the pneumatic quick clamping fixture special for bending machine comprises a clamping block main body 1, a front clamping plate 2, a piston 3, a mold hook 4 and a first connecting member 5, wherein:

the clamp block main body 1, the front clamp plate 2 and the mold hook 4 are arranged along the left-right direction, the front clamp plate 2 is positioned in front of the clamp block main body 1, the mold hook 4 is positioned between the clamp block main body 1 and the front clamp plate 2, the front side surface of the mold hook 4 abuts against the rear side surface of the front clamp plate 2, the upper part of the rear side surface of the mold hook 4 abuts against the upper part of the front side surface of the clamp block main body 1, and the lower part of the rear side surface of the mold hook 4 is provided with a bent upper mold hook 6 for hooking a bent upper mold so as to form a bent upper mold clamping part 7 between the lower part of the rear side surface of the mold hook 4 and the lower part of the front side surface of the clamp block main body 1;

the back side surface of the clamping block main body 1 is provided with a groove 8, the notch of the groove 8 is arranged backwards, the piston 3 is movably arranged in the groove 8 along the front-back direction and is arranged with the peripheral side wall of the groove 8 in a sliding and sealing way, so that a pneumatic chamber 9 is formed between the piston 3 and the groove 8, the clamping block main body 1 is provided with an air inlet 10 and an air outlet 11, the air inlet 10 and the air outlet 11 are respectively communicated with the bottom of the groove 8 through air channels, the first connecting piece 5 is arranged along the front-back direction, the front end of the first connecting piece 5 is connected with the front splint 2, the middle part of the first connecting piece 5 is respectively penetrated through the mould hook 4 and the clamping block main body 1 and is arranged with the mould hook 4 and the clamping block main body 1 in a sliding sealing way, the rear end of the first connecting piece 5 penetrates through the groove bottom of the groove 8 and is connected with the piston 3.

The air inlet 10 and the air outlet 11 may be of any suitable structure, as shown in fig. 1 to 7, in a specific embodiment of the present invention, the air inlet 10 and the air outlet 11 are of a pneumatic joint structure.

In order to prevent the damage to the mold hook 4, the front plate 2 and the bend between the mold hook 4 and the clamping block main body 1, please refer to fig. 2, 4 and 6, in a specific embodiment of the present invention, the pneumatic quick clamping fixture special for bending machine further includes a first elastic member 12, the first elastic member 12 is located between the front side of the mold hook 4 and the rear side of the front plate 2 and respectively abuts against the front side of the mold hook 4 and the rear side of the front plate 2.

The first elastic member 12 can be located at any suitable position, as shown in fig. 2, 4 and 6, in an embodiment of the present invention, the first elastic member 12 is sleeved on the middle portion of the first connecting member 5. Still further, the first elastic members 12 are individually located between the front side of the mold hook 4 and the rear side of the front clamp plate 2.

The first elastic member 12 may be any suitable elastic member, as shown in fig. 2, 4 and 6, and in an embodiment of the present invention, the first elastic member 12 is a spring.

In order to ensure the absolute clamping of the mold hook 4 to the bending upper mold, please refer to fig. 1 to 7, in an embodiment of the present invention, the pneumatic quick clamping fixture special for bending machine further includes a second elastic member 13, one end of the second elastic member 13 is connected to the mold hook 4, and the other end of the second elastic member 13 is bent forward and downward to extend and set and then bent backward and downward to extend and set and abut against the upper portion of the rear side of the front clamping plate 2. Preferably, one end of the second elastic member 13 is connected to the top of the mold hook 4.

The second elastic member 13 may be any suitable elastic member, as shown in fig. 1 to 7, and in an embodiment of the present invention, the second elastic member 13 is an arc-shaped spring plate. Preferably a curved spring steel sheet.

The middle part of the first connecting piece 5 is respectively penetrated and arranged the mold hook 4 and the clamping block main body 1 can adopt any suitable structure, please refer to fig. 2 and fig. 4. in a specific embodiment of the utility model, the mold hook 4 is along the fore-and-aft direction is provided with a first through hole 14, the clamping block main body 1 is along the fore-and-aft direction is provided with a second through hole 15, the middle part of the first connecting piece 5 respectively penetrate and arranged the first through hole 14 with the second through hole 15 and with the first through hole 14 with the equal sliding seal of the second through hole 15 sets up.

The mold hook 4 may have any suitable structure, and preferably, the mold hook 4 includes a plurality of hook units 16, the hook units 16 are sequentially abutted along the left-right direction, and the middle portion of the first connecting member 5 penetrates through a position between two adjacent hook units 16. Referring to fig. 2, in an embodiment of the present invention, in the case that the mold hook 4 is provided with the first through hole 14 along the front-back direction, the left and right sides of the hook unit 16 are respectively provided with a left concave portion 17 and a right concave portion 18, and in two adjacent hook units 16, the right concave portion 18 of the hook unit 16 on the left side and the left concave portion 17 of the hook unit 16 on the right side are relatively folded to form the first through hole 14.

The first connecting member 5 may be any suitable connecting member, and in an embodiment of the present invention, the first connecting member 5 is a bolt.

In order to adapt to a special workpiece or a machining process, the application range of the present invention is improved, please refer to fig. 1-4, 6 and 7, in a specific embodiment of the present invention, the pneumatic quick clamp for bending machine further includes a rear clamp plate 19, the rear clamp plate 19 is disposed along the left-right direction and is located behind the clamp block main body 1 and detachably connected to the clamp block main body 1, the upper portion of the front side surface of the rear clamp plate 19 abuts against the upper portion of the rear side surface of the clamp block main body 1 and at least covers the lower portion of the notch of the groove 8, the lower portion of the front side surface of the rear clamp plate 19 is provided with the bending upper mold hook 6 so as to form the bending upper mold clamping portion 7 between the lower portion of the front side surface of the rear clamp plate 19 and the lower portion of the rear side surface of the clamp block main body 1.

The rear clamping plate 19 is detachably connected to the clamping block main body 1 by any suitable structure, as shown in fig. 2-4, 6 and 7, in a specific embodiment of the present invention, the pneumatic quick clamping fixture special for bending machine further includes a second connecting member 20, and the second connecting member 20 sequentially penetrates through and connects the rear clamping plate 19 and the clamping block main body 1.

The second connector 20 may be any suitable connector, and in one embodiment of the present invention, the second connector 20 is a screw.

In order to adjust the height of the present invention to meet the requirements of the related art, please refer to fig. 1 to 7, in an embodiment of the present invention, the pneumatic quick-clamping fixture special for bending machine further includes a fixture wedge 21 and a third connecting member 22, the fixture wedge 21 is wedge-shaped in the left-right direction, the top of the clamping block main body 1 is provided with an L-shaped concave portion 23 along the left-right direction, the fixture wedge 21 is located on the bottom of the L-shaped concave portion 23, the side wall of the L-shaped concave portion 23 is provided with a long through hole 24 along the left-right direction, and the third connecting member 22 penetrates through the long through hole 24 along the front-back direction and is connected to the fixture wedge 21 so as to connect the fixture wedge 21 with the clamping block main body 1.

The third connecting member 22 may be any suitable connecting member, and in an embodiment of the present invention, the third connecting member 22 is a screw.

The utility model discloses in, sealed setting can adopt sealing washer or other suitable structures to realize.

When the device is used and a mold is filled, a bending upper die is arranged between the lower part of the rear side surface of the mold hook 4 and the lower part of the front side surface of the clamping block main body 1, the bending upper die is hooked on the bending upper die hook 6, air is introduced through the air inlet 10, and enters the pneumatic chamber 9, so that the piston 3 is pushed to move backwards, the front clamping plate 2 is pulled to move backwards through the first connecting piece 5, the mold hook 4 and the clamping block main body 1 are clamped, and the bending upper die is clamped in the bending upper die clamping part 7; when unloading the mould, give vent to anger through gas outlet 11, the gaseous reduction in the pneumatic chamber 9 for piston 3 moves forward, promotes preceding splint 2 through first connecting piece 5 and moves forward, loosens mould couple 4 and clamp splice main part 1, thereby will bend and go up the mould and dismantle from the mould couple 6 of bending.

When the front splint 1 is stressed to move backwards, the first elastic part 12 plays a role in buffering; the second elastic element 13 gives a reaction force to the front clamping plate 1, ensuring absolute clamping of the mould hook 4 to the bent upper mould. If the working plane of the bending lower die is inclined, the position of the third connecting piece 22 in the elongated through hole 24 can be adjusted, i.e. the height of the fixture is adjusted to meet the process requirements.

For some special cases, for example, when the bending upper die clamped by the front clamping plate 2 interferes with a bent sheet metal workpiece in the machining process, the bending upper die can be manually clamped by the rear clamping plate 19, specifically, when the die is installed, the bending upper die is arranged between the lower part of the front side surface of the rear clamping plate 19 and the lower part of the rear side surface of the clamping block main body 1, and is hooked on the bending upper die hook 6, and the second connecting piece 20 is sequentially arranged in a penetrating manner and connected with the rear clamping plate 19 and the clamping block main body 1; when the die is disassembled, the second connecting piece 20, the rear clamping plate 19 and the clamping block main body 1 are disassembled, the rear clamping plate 19 moves backwards, the rear clamping plate 19 and the clamping block main body 1 are loosened, and therefore the bending upper die is disassembled from the bending upper die hook 6.

Compared with the prior art, the utility model has the advantages that:

1. compare in ordinary manual jig, the utility model discloses an it obtains very big promotion to bend to go up mould handling efficiency, has reduced man-hour, reduce cost.

2. The utility model discloses a second elastic component has increased the pretightning force, presss from both sides tighter, can not have the phenomenon of rocking so that cause the error of size precision to the machined part.

3. The utility model discloses still increased manual anchor clamps on pneumatic fixture's basis, to special machined part or processing technology, improved the utility model discloses an application range.

4. The utility model discloses a mould couple segmentation cooperation is used, to miniature mould, can be more stable when pressing from both sides tightly, of course, also does not have the influence to big mould.

Therefore, by adopting the special pneumatic quick-clamping clamp for the bending machine, air is firstly fed from the air inlet, the piston moves backwards, and then the front clamping plate is connected with the piston through the connecting piece, so that the front clamping plate is subjected to the pulling force from the piston, namely the clamping force of the clamp on the bending upper die; furthermore, the utility model discloses not only can the pneumatic clamp tightly, to some special cases, also can the manual clamp tight, consequently, the manual clamp of back splint tightly has more perfected the utility model discloses a performance.

To sum up, the utility model discloses a mould is efficient on the special pneumatic fast clamp anchor clamps loading and unloading of bender, labour saving and time saving, the centre gripping is stable, can not influence the size precision of machined part, design benefit, and the structure is succinct, makes portably, and is with low costs, is suitable for extensive popularization and application.

Therefore, the purpose of the utility model is completely and effectively realized. The functional and structural principles of the present invention have been shown and described in the embodiments, and the embodiments may be modified without departing from the principles. Therefore, the present invention includes all modifications within the spirit and scope of the appended claims.

Claims

1. The utility model provides a special pneumatic quick clamp of bender which characterized in that, includes clamp splice main part, preceding splint, piston, mould couple and first connecting piece, wherein:

2. The special pneumatic quick-clamping fixture for bending machines according to claim 1, characterized by further comprising a first elastic member, wherein the first elastic member is positioned between the front side surface of the die hanger and the rear side surface of the front clamping plate and abuts against the front side surface of the die hanger and the rear side surface of the front clamping plate, respectively.

3. The pneumatic quick-clamping fixture special for bending machines as claimed in claim 2, wherein said first elastic member is sleeved on the middle part of said first connecting member.

4. The pneumatic quick-clamping clamp special for the bending machine according to claim 1, further comprising a second elastic member, wherein one end of the second elastic member is connected with the die hook, and the other end of the second elastic member is bent and extended forwards and downwards and then bent and extended backwards and downwards and abuts against the upper part of the rear side surface of the front clamping plate.

5. The pneumatic quick-clamping clamp special for bending machines as claimed in claim 4, wherein said second elastic member is an arc-shaped spring plate.

6. The special pneumatic quick clamp for bending machines according to claim 1, wherein the die hook is provided with a first through hole along the front-back direction, the clamp block body is provided with a second through hole along the front-back direction, and the middle part of the first connecting piece is respectively penetrated with the first through hole and the second through hole and is in sliding sealing arrangement with the first through hole and the second through hole.

7. The special pneumatic quick clamp for the bending machine according to claim 1, wherein the die hook comprises a plurality of hook units, the hook units are sequentially abutted along the left-right direction, and the middle part of the first connecting piece penetrates through a position between two adjacent hook units.

8. The special pneumatic quick-clamping fixture for bending machines according to claim 1, further comprising a rear clamping plate, wherein the rear clamping plate is arranged in the left-right direction, is located behind the clamping block main body and is detachably connected with the clamping block main body, the upper portion of the front side surface of the rear clamping plate abuts against the upper portion of the rear side surface of the clamping block main body and at least covers the lower portion of the notch of the groove, and the lower portion of the front side surface of the rear clamping plate is provided with the bending upper die hook so as to form the bending upper die clamping portion between the lower portion of the front side surface of the rear clamping plate and the lower portion of the rear side surface of the clamping block main body.

9. The special pneumatic quick clamp for bending machines according to claim 8, further comprising a second connecting member, wherein the second connecting member is sequentially inserted through and connected with the rear clamping plate and the clamping block main body.

10. The pneumatic quick-clamping fixture special for bending machines according to claim 1, wherein the pneumatic quick-clamping fixture special for bending machines further comprises a fixture wedge and a third connecting member, the fixture wedge is wedge-shaped in the left-right direction, an L-shaped recess is formed in the top of the fixture main body along the left-right direction, the fixture wedge is located on the bottom of the L-shaped recess, a long through hole is formed in the side wall of the L-shaped recess along the left-right direction, and the third connecting member penetrates through the long through hole along the front-back direction and is connected with the fixture wedge so as to connect the fixture wedge with the fixture main body.