CN212093840U

CN212093840U - Steel plate bending device

Info

Publication number: CN212093840U
Application number: CN202020402747.0U
Authority: CN
Inventors: 梁大银; 夏小超
Original assignee: Mianyang Junwei Model Co ltd
Current assignee: Mianyang Junwei Model Co ltd
Priority date: 2020-03-26
Filing date: 2020-03-26
Publication date: 2020-12-08
Anticipated expiration: 2030-03-26

Abstract

The utility model discloses a steel plate bending device, which belongs to the technical field of steel plate processing, wherein a lower groove is arranged on a platform, a lower concave die is fixed in the lower groove, and the top of the lower concave die is flush with the top of the platform; the lower surface of the upper moving table is provided with an upper groove, and the upper male die is fixed on the upper groove; positioning the steel plate through the positioning device and locking one side of the steel plate on the platform through the two locking devices; one side of the steel plate, which is not locked, is bent under the matched extrusion of the upper male die and the lower female die; the locking device comprises a supporting lug, and a rotating upright post is rotatably arranged on the supporting lug; a rotating plate is fixed at the top end of the rotating upright post; the rotating plate is screwed with a bolt through threads; a rotating handle is fixed at the top of the bolt; the rotating handle is used for rotating the bolt to enable the bolt to move downwards to lock the steel plate; one end of the rotating handle is provided with a rotatable rotating head which is used as a hand-held part. The utility model discloses a steel sheet bending device can lock one side of steel sheet fast, has improved machining efficiency and the machining precision that the steel sheet was bent.

Description

Steel plate bending device

Technical Field

The utility model belongs to the technical field of the steel sheet processing, specifically speaking relates to a steel sheet bending device.

Background

In the manufacturing process of models such as an airplane model, a tank armor model, a vehicle model, a ship model and the like, a large number of steel plates need to be bent. When the steel plate is bent, the steel plate is placed on the platform, and the upper convex die and the lower concave die are matched to extrude and bend the steel plate; if one side of the steel plate is not locked, both sides of the steel plate are free ends when the steel plate is bent, so that the bending precision of the steel plate is not facilitated, and the manufacturing and assembly of a model are influenced; in addition, one side of the steel plate is locked, and a quick locking device is needed, so that the efficiency requirement of steel plate bending processing can be met.

In addition, in the process of improving the bending precision of the steel plate, the size of the free end of the steel plate needs to be measured and then bending is carried out, and if the size is not measured, the steel plate is easy to generate large deviation after bending; in order to avoid each measurement, a positioning device is often needed, the steel plate is abutted to the positioning device for rapid positioning, and after the positioning device is removed, the steel plate is bent; however, for different steel plate bending sizes, the position of the positioning device needs to be positioned. However, none of the existing positioning devices can be adjusted according to the bending sizes of different steel plates; and the positioning device has low adjustment efficiency, and seriously influences the bending efficiency of the steel plate.

SUMMERY OF THE UTILITY MODEL

The utility model aims at above-mentioned weak point provides a steel sheet bending device, and the locking device and the positioner precision of solving current steel sheet bending device are low, the inefficiency scheduling problem. In order to achieve the above object, the utility model provides a following technical scheme:

a steel plate bending device comprises a platform 2, an upper moving platform 4, an upper male die 41, a lower female die 42, a positioning device 1 and two locking devices 5; the platform 2 is provided with a lower groove 43, the lower concave die 42 is fixed in the lower groove 43, and the top of the lower concave die 42 is flush with the top of the platform 2; an upper groove 44 is formed in the lower surface of the upper moving table 4, and the upper male die 41 is fixed on the upper groove 44; a steel plate 3 is placed on the platform 2, the steel plate 3 is positioned through the positioning device 1, and one side of the steel plate 3 is locked on the platform 2 through the two locking devices 5; one side of the steel plate 3 which is not locked is bent under the matched extrusion of the upper male die 41 and the lower female die 42; the locking device 5 comprises a supporting lug 51, a rotating column 52, a rotating plate 53, a bolt 54, a rotating handle 55 and a rotating head 56; the supporting lug 51 is fixed on one side of the platform 2; the supporting lug 51 is rotatably provided with a rotating column 52; a rotating plate 53 is fixed at the top end of the rotating column 52; a bolt 54 is screwed on the rotating plate 53 through threads; a rotating handle 55 is fixed at the top of the bolt 54; the rotating handle 55 is used for rotating the bolt 54, so that the bolt 54 moves the locking steel plate 3 downwards; one end of the rotating handle 55 is provided with a rotatable rotating head 56, and the rotating head 56 is used as a hand-held part; the lower end of the bolt 54 is fixed with a rubber layer, and the lower end of the bolt 54 compresses the steel plate 3 through the rubber layer. According to the structure, the steel plate 3 is placed on the platform 2, the positioning device 1 is used for positioning the steel plate 3, after the bending size of the steel plate 3 is determined, one side of the steel plate 3 needs to be locked, and a free end is reserved, so that the bending effect of the steel plate 3 can be expected; rotating the rotating column 52 to enable the rotating plate 53 to be positioned above the steel plate 3, holding the rotating head 56 by hand, rotating the rotating handle 55 to enable the bolt 54 to move downwards to lock the steel plate 3, and enabling the lower end of the bolt 54 to tightly press the steel plate 3 through the rubber layer; the unlocked side of the steel plate 3 is bent under the matched extrusion of the upper male die 41 and the lower female die 42; after the steel plate 3 is bent, the rotating handle 55 is rotated, the bolt 54 is enabled to move upwards to unlock the steel plate 3, the rotating column 52 is rotated, the rotating plate 53 is enabled to leave the upper side of the steel plate 3, and the steel plate 3 can be taken out conveniently. The swivel 56 cooperates with the stem 55 to facilitate rapid adjustment of the bolt 54 to move up and down, and the stem 55 amplifies the force.

Further, the positioning device 1 comprises a housing 11, a guide block 12, a spring 13, a push rod 14, a baffle plate 15, a positioning block 16, a supporting block 17, a cam 18, a rotating shaft 19, a handle 21 and two supporting arms 22; the lower surface of the shell 11 is provided with an opening and is fixed on the platform 2; a guide block 12 capable of moving left and right is arranged in the shell 11; the guide block 12 is fixed at one end of the push rod 14; a baffle 15 is fixed at the other end of the push rod 14; the push rod 14 penetrates through the left side wall of the shell 11, and the spring 13 is sleeved on the push rod 14; the spring 13 is compressed between the guide block 12 and the inner wall of the housing 11, so that the guide block 12 tends to move rightwards; a supporting block 17 is arranged on the left side of the shell 11, and supporting arms 22 are arranged on two sides of the top of the supporting block 17; a rotating shaft 19 is supported between the two supporting arms 22, and a cam 18 is fixed on the rotating shaft 19; the cam 18 is controlled by a handle 21 and rotates by taking the rotating shaft 19 as an axis to quickly lock the push rod 14 at the top of the supporting block 17; a positioning block 16 is arranged on the push rod 14; the positioning block 16 and the guide block 12 jointly support the push rod 14 on the platform 2; the side surface of the positioning block 16 is provided with a pointer 23 which is matched with the scale arranged on the platform 2 to indicate the position of the baffle 15 for positioning the steel plate 3. With the above structure, the positioning device 1 works according to the following principle: when the size of the steel plate 3 needing to be bent is known, the cam 18 does not press the push rod 14, the positioning block 16 is pulled leftwards, the spring 13 stores energy, the pointer 23 on the side surface of the positioning block 16 is moved to a required position in contrast to the scale on the platform 2, the handle 21 is rotated, the cam 18 rotates by taking the rotating shaft 19 as an axis to quickly lock the push rod 14 at the top of the supporting block 17, and at the moment, the push rod 14 has micro deformation; because the push rod 14 is locked, the position of the baffle 15 can not be moved, the steel plate 3 is directly abutted against the baffle 15, and the bending size of the steel plate 3 is determined; when the steel plate 3 needs other bending sizes, the positioning size can be quickly and accurately changed only by adjusting the corresponding scale of the pointer 23 of the positioning block 16; after the steel plate 3 is positioned, the handle 21 is rotated, the cam 18 does not extrude the push rod 14, the guide block 12 moves to the right rapidly under the action of the spring 13 and resets, and the steel plate 3 is prevented from being bent by interference equipment; when the positioning block 16 moves rightwards to the supporting block 17, resetting is completed, the structure can be quickly positioned, and the steel plate 3 can be quickly and automatically reset after being positioned, so that the operation is simple, and the bending efficiency of the steel plate 3 is improved.

Further, a groove 24 extending left and right is formed in the upper surface of the supporting block 17; the bottom surface of the groove 24 is a column arc surface; a rubber sleeve 25 is fixed on the groove 24; the rubber sleeve 25 is sleeved on the push rod 14; the cam 18 locks the push rod 14 by pressing the rubber sleeve 25. As can be seen from the above structure, the push rod 14 is locked by the cam 18 pressing the rubber sleeve 25, and the push rod 14 is prevented from being worn.

Further, the handle 21 comprises a handle 26 and a ball head 27; the handle 26 is fixed at both ends with a ball 27 and a cam 18, respectively. With the above structure, the handle 26 can increase the force arm, and the push rod 14 can be locked by the cam 18 quickly and effortlessly by holding the ball head 27 with a hand and rotating the handle 26.

Further, when the handle 26 is rotated leftwards to a horizontal position, the radius from the rotating shaft 19 to the edge of the cam 18 is longest, at this time, the cam 18 and the supporting block 17 extrude the rubber sleeve 25, and the push rod 14 is locked; when the handle 26 is rotated to the vertical position, the radius of the rotating shaft 19 vertically downward to the edge of the cam 18 is the shortest, at the moment, the cam 18 and the supporting block 17 do not press the rubber sleeve 25, and a certain gap exists between the inner wall of the rubber sleeve 25 and the upper side of the push rod 14. With the above structure, when the handle 26 is rotated to the horizontal position, the push rod 14 is locked, the handle 26 can be pressed by hand pressure to rotate, and the left side is closer to the steel plate 3, thereby reducing the operating distance.

Further, the positioning block 16 is provided with a rubber pad 28 on a side facing the supporting block 17, and the rubber pad 28 is used for avoiding directly colliding with the supporting block 17 when the positioning block 16 moves rightwards. As can be seen from the above structure, the rubber pad 28 plays a role of cushioning.

Further, the baffle 15 comprises a cross bar 29 and two stoppers 30; the middle part of the cross bar 29 is fixed at the end part of the push rod 14, and the cross bar 29 is vertical to the push rod 14; two ends of the cross rod 29 are respectively fixed with a stop 30; the stopper 30 is used for contacting the steel plate 3 to position the steel plate 3. With the above structure, the two stoppers 30 can position the steel plate 3 more accurately.

Further, magnets are respectively embedded at four corners of the bottom of the upper groove 44; the magnet is used to assist the upper punch 41 in quickly fitting into the upper groove 44 when the upper punch 41 is secured to the upper groove 44.

The utility model has the advantages that:

1. the utility model discloses a steel plate bending device, wherein a lower groove is arranged on a platform, a lower concave die is fixed in the lower groove, and the top of the lower concave die is flush with the top of the platform; the lower surface of the upper moving table is provided with an upper groove, and the upper male die is fixed on the upper groove; positioning the steel plate through the positioning device and locking one side of the steel plate on the platform through the two locking devices; one side of the steel plate, which is not locked, is bent under the matched extrusion of the upper male die and the lower female die; the locking device comprises a supporting lug, and a rotating upright post is rotatably arranged on the supporting lug; a rotating plate is fixed at the top end of the rotating upright post; the rotating plate is screwed with a bolt through threads; a rotating handle is fixed at the top of the bolt; the rotating handle is used for rotating the bolt to enable the bolt to move downwards to lock the steel plate; one end of the rotating handle is provided with a rotatable rotating head which is used as a hand-held part. The utility model discloses a steel sheet bending device can lock one side of steel sheet fast, has improved machining efficiency and the machining precision that the steel sheet was bent.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention, with a positioning device cut away;

fig. 2 is a schematic view of the locking device of the present invention when locking a steel plate;

FIG. 3 is a schematic view of the locking device of the present invention when unlocked from a steel plate;

fig. 4 is an undivided top view of the positioning device of the present invention;

FIG. 5 is a cross-sectional view of the support block and rubber sleeve of the present invention;

in the drawings: 1-a positioning device, 11-a shell, 12-a guide block, 13-a spring, 14-a push rod, 15-a baffle, 16-a positioning block, 17-a supporting block, 18-a cam, 19-a rotating shaft, 2-a platform, 21-a handle, 22-a supporting arm, 23-a pointer, 24-a groove, 25-a rubber sleeve and 26-a handle rod, 27-ball head, 28-rubber pad, 29-cross bar, 30-baffle head, 3-steel plate, 4-upper moving table, 41-upper convex die, 42-lower concave die, 43-lower groove, 44-upper groove, 5-locking device, 51-supporting lug, 52-rotating column, 53-rotating plate, 54-bolt, 55-rotating handle and 56-rotating head.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

The first embodiment is as follows:

see figures 1-5. A steel plate bending device comprises a platform 2, an upper moving platform 4, an upper male die 41, a lower female die 42, a positioning device 1 and two locking devices 5; the platform 2 is provided with a lower groove 43, the lower concave die 42 is fixed in the lower groove 43, and the top of the lower concave die 42 is flush with the top of the platform 2; an upper groove 44 is formed in the lower surface of the upper moving table 4, and the upper male die 41 is fixed on the upper groove 44; a steel plate 3 is placed on the platform 2, the steel plate 3 is positioned through the positioning device 1, and one side of the steel plate 3 is locked on the platform 2 through the two locking devices 5; one side of the steel plate 3 which is not locked is bent under the matched extrusion of the upper male die 41 and the lower female die 42; the locking device 5 comprises a supporting lug 51, a rotating column 52, a rotating plate 53, a bolt 54, a rotating handle 55 and a rotating head 56; the supporting lug 51 is fixed on one side of the platform 2; the supporting lug 51 is rotatably provided with a rotating column 52; a rotating plate 53 is fixed at the top end of the rotating column 52; a bolt 54 is screwed on the rotating plate 53 through threads; a rotating handle 55 is fixed at the top of the bolt 54; the rotating handle 55 is used for rotating the bolt 54, so that the bolt 54 moves the locking steel plate 3 downwards; one end of the rotating handle 55 is provided with a rotatable rotating head 56, and the rotating head 56 is used as a hand-held part; the lower end of the bolt 54 is fixed with a rubber layer, and the lower end of the bolt 54 compresses the steel plate 3 through the rubber layer. According to the structure, the steel plate 3 is placed on the platform 2, the positioning device 1 is used for positioning the steel plate 3, after the bending size of the steel plate 3 is determined, one side of the steel plate 3 needs to be locked, and a free end is reserved, so that the bending effect of the steel plate 3 can be expected; rotating the rotating column 52 to enable the rotating plate 53 to be positioned above the steel plate 3, holding the rotating head 56 by hand, rotating the rotating handle 55 to enable the bolt 54 to move downwards to lock the steel plate 3, and enabling the lower end of the bolt 54 to tightly press the steel plate 3 through the rubber layer; the unlocked side of the steel plate 3 is bent under the matched extrusion of the upper male die 41 and the lower female die 42; after the steel plate 3 is bent, the rotating handle 55 is rotated, the bolt 54 is enabled to move upwards to unlock the steel plate 3, the rotating column 52 is rotated, the rotating plate 53 is enabled to leave the upper side of the steel plate 3, and the steel plate 3 can be taken out conveniently. The swivel 56 cooperates with the stem 55 to facilitate rapid adjustment of the bolt 54 to move up and down, and the stem 55 amplifies the force.

Example two:

The positioning device 1 comprises a shell 11, a guide block 12, a spring 13, a push rod 14, a baffle 15, a positioning block 16, a supporting block 17, a cam 18, a rotating shaft 19, a handle 21 and two supporting arms 22; the lower surface of the shell 11 is provided with an opening and is fixed on the platform 2; a guide block 12 capable of moving left and right is arranged in the shell 11; the guide block 12 is fixed at one end of the push rod 14; a baffle 15 is fixed at the other end of the push rod 14; the push rod 14 penetrates through the left side wall of the shell 11, and the spring 13 is sleeved on the push rod 14; the spring 13 is compressed between the guide block 12 and the inner wall of the housing 11, so that the guide block 12 tends to move rightwards; a supporting block 17 is arranged on the left side of the shell 11, and supporting arms 22 are arranged on two sides of the top of the supporting block 17; a rotating shaft 19 is supported between the two supporting arms 22, and a cam 18 is fixed on the rotating shaft 19; the cam 18 is controlled by a handle 21 and rotates by taking the rotating shaft 19 as an axis to quickly lock the push rod 14 at the top of the supporting block 17; a positioning block 16 is arranged on the push rod 14; the positioning block 16 and the guide block 12 jointly support the push rod 14 on the platform 2; the side surface of the positioning block 16 is provided with a pointer 23 which is matched with the scale arranged on the platform 2 to indicate the position of the baffle 15 for positioning the steel plate 3. With the above structure, the positioning device 1 works according to the following principle: when the size of the steel plate 3 needing to be bent is known, the cam 18 does not press the push rod 14, the positioning block 16 is pulled leftwards, the spring 13 stores energy, the pointer 23 on the side surface of the positioning block 16 is moved to a required position in contrast to the scale on the platform 2, the handle 21 is rotated, the cam 18 rotates by taking the rotating shaft 19 as an axis to quickly lock the push rod 14 at the top of the supporting block 17, and at the moment, the push rod 14 has micro deformation; because the push rod 14 is locked, the position of the baffle 15 can not be moved, the steel plate 3 is directly abutted against the baffle 15, and the bending size of the steel plate 3 is determined; when the steel plate 3 needs other bending sizes, the positioning size can be quickly and accurately changed only by adjusting the corresponding scale of the pointer 23 of the positioning block 16; after the steel plate 3 is positioned, the handle 21 is rotated, the cam 18 does not extrude the push rod 14, the guide block 12 moves to the right rapidly under the action of the spring 13 and resets, and the steel plate 3 is prevented from being bent by interference equipment; when the positioning block 16 moves rightwards to the supporting block 17, resetting is completed, the structure can be quickly positioned, and the steel plate 3 can be quickly and automatically reset after being positioned, so that the operation is simple, and the bending efficiency of the steel plate 3 is improved.

Example three:

The upper surface of the supporting block 17 is provided with a groove 24 extending left and right; the bottom surface of the groove 24 is a column arc surface; a rubber sleeve 25 is fixed on the groove 24; the rubber sleeve 25 is sleeved on the push rod 14; the cam 18 locks the push rod 14 by pressing the rubber sleeve 25. As can be seen from the above structure, the push rod 14 is locked by the cam 18 pressing the rubber sleeve 25, and the push rod 14 is prevented from being worn.

The handle 21 comprises a handle bar 26 and a ball head 27; the handle 26 is fixed at both ends with a ball 27 and a cam 18, respectively. With the above structure, the handle 26 can increase the force arm, and the push rod 14 can be locked by the cam 18 quickly and effortlessly by holding the ball head 27 with a hand and rotating the handle 26.

When the handle rod 26 is rotated leftwards to a horizontal position, the radius from the rotating shaft 19 to the edge of the cam 18 is the longest, at the moment, the cam 18 and the supporting block 17 extrude the rubber sleeve 25, and the push rod 14 is locked; when the handle 26 is rotated to the vertical position, the radius of the rotating shaft 19 vertically downward to the edge of the cam 18 is the shortest, at the moment, the cam 18 and the supporting block 17 do not press the rubber sleeve 25, and a certain gap exists between the inner wall of the rubber sleeve 25 and the upper side of the push rod 14. With the above structure, when the handle 26 is rotated to the horizontal position, the push rod 14 is locked, the handle 26 can be pressed by hand pressure to rotate, and the left side is closer to the steel plate 3, thereby reducing the operating distance.

The positioning block 16 is provided with a rubber pad 28 on the side facing the support block 17, and the rubber pad 28 is used for avoiding direct collision with the support block 17 when the positioning block 16 moves rightwards. As can be seen from the above structure, the rubber pad 28 plays a role of cushioning.

The baffle 15 comprises a cross bar 29 and two stoppers 30; the middle part of the cross bar 29 is fixed at the end part of the push rod 14, and the cross bar 29 is vertical to the push rod 14; two ends of the cross rod 29 are respectively fixed with a stop 30; the stopper 30 is used for contacting the steel plate 3 to position the steel plate 3. With the above structure, the two stoppers 30 can position the steel plate 3 more accurately.

Magnets are embedded at four corners of the bottom of the upper groove 44 respectively; the magnet is used to assist the upper punch 41 in quickly fitting into the upper groove 44 when the upper punch 41 is secured to the upper groove 44.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.

Claims

1. The utility model provides a steel sheet bending device which characterized in that: comprises a platform (2), an upper moving platform (4), an upper male die (41), a lower female die (42), a positioning device (1) and two locking devices (5); a lower groove (43) is formed in the platform (2), the lower concave die (42) is fixed in the lower groove (43), and the top of the lower concave die (42) is flush with the top of the platform (2); an upper groove (44) is formed in the lower surface of the upper moving table (4), and the upper male die (41) is fixed on the upper groove (44); a steel plate (3) is placed on the platform (2), the steel plate (3) is positioned through the positioning device (1), and one side of the steel plate (3) is locked on the platform (2) through the two locking devices (5); one side, which is not locked, of the steel plate (3) is bent under the matched extrusion of the upper male die (41) and the lower female die (42); the locking device (5) comprises a supporting lug (51), a rotating column (52), a rotating plate (53), a bolt (54), a rotating handle (55) and a rotating head (56); the supporting lug (51) is fixed on one side of the platform (2); the supporting lug (51) is rotatably provided with a rotating column (52); a rotating plate (53) is fixed at the top end of the rotating column (52); a bolt (54) is screwed on the rotating plate (53) through threads; a rotating handle (55) is fixed at the top of the bolt (54); the rotating handle (55) is used for rotating the bolt (54) so that the bolt (54) moves the locking steel plate (3) downwards; one end of the rotating handle (55) is provided with a rotatable rotating head (56), and the rotating head (56) is used as a handheld part; the rubber layer is fixed at the lower end of the bolt (54), and the steel plate (3) is pressed at the lower end of the bolt (54) through the rubber layer.

2. The steel plate bending device according to claim 1, wherein: the positioning device (1) comprises a shell (11), a guide block (12), a spring (13), a push rod (14), a baffle plate (15), a positioning block (16), a supporting block (17), a cam (18), a rotating shaft (19), a handle (21) and two supporting arms (22); the lower surface of the shell (11) is provided with an opening and is fixed on the platform (2); a guide block (12) capable of moving left and right is arranged in the shell (11); the guide block (12) is fixed at one end of the push rod (14); a baffle (15) is fixed at the other end of the push rod (14); the push rod (14) penetrates through the left side wall of the shell (11), and the push rod (14) is sleeved with a spring (13); the spring (13) is compressed between the guide block (12) and the inner wall of the shell (11), so that the guide block (12) has the tendency of moving rightwards; a supporting block (17) is arranged on the left side of the shell (11), and supporting arms (22) are arranged on two sides of the top of the supporting block (17); a rotating shaft (19) is supported between the two supporting arms (22), and a cam (18) is fixed on the rotating shaft (19); the cam (18) is controlled by a handle (21) and can rotate by taking the rotating shaft (19) as an axis to quickly lock the push rod (14) at the top of the supporting block (17); a positioning block (16) is arranged on the push rod (14); the positioning block (16) and the guide block (12) jointly support the push rod (14) on the platform (2); the side of the positioning block (16) is provided with a pointer (23), and the position of the baffle (15) used for positioning the steel plate (3) is indicated by matching with the scale arranged on the platform (2).

3. The steel plate bending device according to claim 2, wherein: the upper surface of the supporting block (17) is provided with a groove (24) extending left and right; the bottom surface of the groove (24) is a column arc surface; a rubber sleeve (25) is fixed on the groove (24); the rubber sleeve (25) is sleeved on the push rod (14); the cam (18) locks the push rod (14) by pressing the rubber sleeve (25).

4. The steel plate bending device according to claim 3, wherein: the handle (21) comprises a handle rod (26) and a ball head (27); the two ends of the handle rod (26) are respectively fixed with the ball head (27) and the cam (18).

5. The steel plate bending device according to claim 4, wherein: when the handle rod (26) is rotated leftwards to a horizontal position, the rotating shaft (19) vertically downwards has the longest radius to the edge of the cam (18), at the moment, the cam (18) and the supporting block (17) extrude the rubber sleeve (25), and the push rod (14) is locked; when the handle rod (26) is rotated to a vertical position, the radius of the rotating shaft (19) vertically downward to the edge of the cam (18) is shortest, the cam (18) and the supporting block (17) do not extrude the rubber sleeve (25), and a certain gap exists between the inner wall of the rubber sleeve (25) and the upper side of the push rod (14).

6. The steel plate bending device according to claim 5, wherein: the side of the positioning block (16) facing the supporting block (17) is provided with a rubber pad (28), and the rubber pad (28) is used for avoiding directly colliding with the supporting block (17) when the positioning block (16) moves rightwards.

7. A steel plate bending device according to any one of claims 2 to 6, wherein: the baffle (15) comprises a cross bar (29) and two stoppers (30); the middle part of the cross rod (29) is fixed at the end part of the push rod (14), and the cross rod (29) is vertical to the push rod (14); two ends of the cross rod (29) are respectively fixed with a stop head (30); the stop head (30) is used for contacting the steel plate (3) to realize the positioning of the steel plate (3).

8. A steel plate bending apparatus according to any one of claims 1 to 6, wherein: magnets are embedded at four corners of the bottom of the upper groove (44) respectively; the magnet is used for assisting the upper punch (41) to be rapidly matched with the upper groove (44) when the upper punch (41) is fixed on the upper groove (44).