CN112845880A

CN112845880A - Stamping die for die protection

Info

Publication number: CN112845880A
Application number: CN202110211102.8A
Authority: CN
Inventors: 邹苏娥
Original assignee: Individual
Current assignee: Ruian Yintong Electric Appliance Co ltd
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2021-05-28
Anticipated expiration: 2039-08-13
Also published as: CN112845879B; CN110405074B; CN112845880B; CN110405074A; CN112845879A

Abstract

The invention belongs to the field of stamping dies, and particularly relates to a stamping die for die protection, which comprises a base, a top plate, supporting columns, a platform, a hydraulic pump, a hydraulic column, a die holder, a die, a limiting plate and a limiting mechanism, wherein the top plate is arranged above the base through four symmetrically distributed supporting columns; compared with the guiding mechanism of the hardware stamping die with the patent number of CN 107745045, which adopts the driving motor and the stepping motor as the driving modes of the related structures, the invention can realize the same effect by only driving the stepping motor, and the operation is simple and convenient; compared with the effect of protecting the die by adopting two motors, the invention has only one stepping motor, thereby reducing the cost to a certain extent. In addition, the invention has simple structure and high practicability under the condition that only one stepping motor is used for driving.

Description

Stamping die for die protection

Technical Field

The invention belongs to the field of stamping dies, and particularly relates to a stamping die for die protection.

Background

The hardware commonly used in life is stamped by a hardware stamping die, the efficiency of stamping the required hardware by the hardware stamping die is high, and the produced hardware has standard specification; the hardware stamping die is widely applied to industrial production, parts are produced by the hardware stamping die, the production efficiency is high, the standard batch production can be realized, raw materials are saved, and the utilization rate of the raw materials is improved; meanwhile, the stamping die can realize the characteristic of non-cutting processing. In the stamping process, if the stamping stroke of the die is not limited, the die continues to move towards the platform and is in contact collision extrusion with the platform after the stamping of the raw material is finished, so that the die is damaged or deformed; the production cost of the die used in the production process is high, and the damage of the die inevitably causes unnecessary loss of enterprises; in addition, the 'guide mechanism of hardware stamping die' disclosed in the prior art with the patent number of 'CN 107745045' adopts a driving mode of two motors, and a control system of the two motors relative to the guide mechanism is complex, complicated in operation and high in cost; we have therefore proposed a press die which can be used to limit the die press stroke to solve the above problems.

The invention designs a stamping die for die protection to solve the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a stamping die for die protection, which is realized by adopting the following technical scheme.

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.

A stamping die for mould protection which characterized in that: the hydraulic die comprises a base, a top plate, supporting columns, a platform, a hydraulic pump, a hydraulic column, a die holder, a die, a limiting plate and a limiting mechanism, wherein the top plate is arranged above the base through four symmetrically distributed supporting columns; a hydraulic pump is arranged below the top plate, and a vertically telescopic hydraulic column is arranged below the hydraulic pump; the lower end of the hydraulic column is provided with a die holder, and the lower end of the die holder is provided with a die; the mould is matched with a platform arranged on the base; the limiting plate which moves synchronously along with the extension of the hydraulic column is matched with a limiting mechanism arranged on the base.

The limiting mechanism comprises a shell, a shaft A, a friction wheel, a one-way driving mechanism, a shaft B, a limiting block, a friction plate, a sliding block, a reset spring, a thin steel wire, a wire winding wheel, a shaft C, a shaft D, an incomplete gear, a gear A and a stepping motor, wherein a vertical shaft A and a vertical shaft B are matched with a bearing in the shell; two one-way driving mechanisms are arranged on the shaft A and are connected through a shaft sleeve rotating on the shaft A; the shaft sleeve is in transmission connection with the shaft B; the external thread on the shaft B is in threaded fit with the threaded hole on the U-shaped limiting block; the limiting block which vertically slides along the axial direction of the shaft B is matched with the limiting plate; the sliding block horizontally slides in the shell; one end of the sliding block is provided with an arc-shaped friction plate, the other end of the sliding block is in transmission connection with two wire winding wheels which are symmetrically distributed on two sides of the sliding block through two thin steel wires respectively, and the winding directions of the thin steel wires on the two wire winding wheels are opposite; the friction plate is matched with a friction wheel arranged on the shaft sleeve; a return spring for returning the slide block is arranged on the slide block; the shaft C where each wire winding wheel is located is in transmission connection with the shaft D where the incomplete gear is located and installed in the shell; a stepping motor is arranged on the inner wall of the shell; a gear A arranged on an output shaft of the stepping motor is matched with the incomplete gear; the output shaft of the stepping motor is in transmission connection with the shaft A.

The one-way driving mechanism comprises a rotating ring A, a rotating ring B, a fixture block B, a fixed ring, a fixture block A and a volute spiral spring, wherein the rotating ring A with the end surface connected with one end of the shaft sleeve rotates on the shaft A; the rotating ring B rotating on the shaft A is embedded into the ring groove A on the inner wall of the shaft hole of the rotating ring A; the fixed ring arranged on the shaft A is embedded into the ring groove B on the inner wall of the shaft hole of the rotating ring B; the clamping block A arranged on the outer cylindrical surface of the fixing ring is matched with the clamping block B arranged on the inner wall of the annular groove B; the outer cylindrical surface of the rotating ring B is nested with a volute spiral spring for resetting the rotating ring B.

The spiral springs in the two one-way driving mechanisms are opposite in rotation direction.

As a further improvement of the technology, the limiting mechanism is installed on the base through a fixed seat A; the limiting block is arranged on the hydraulic column through a connecting block; two sliding sleeves are symmetrically arranged at two ends of the limiting plate and respectively nested and slide on the two supporting columns. The sliding sleeve and the supporting column are matched to play a role in positioning and guiding the vertical movement of the limiting plate.

As a further improvement of the technology, the two legs of the limiting block vertically slide in the two guide grooves on the side surface of the shell. The guide groove plays a positioning and guiding role in the vertical movement of the limiting block.

As a further improvement of this technique, a gear D is attached to the sleeve, and the gear D meshes with a gear E attached to the shaft B.

As a further improvement of the technology, a fixed seat B is arranged on the inner wall of the shell, and a trapezoidal guide block arranged at the lower end of the sliding block slides in a trapezoidal guide groove on the fixed seat B; the two shafts C are respectively matched with the bearings of the fixed seat B; the two shafts C are respectively provided with gears G, and the two gears G are simultaneously meshed with a gear F arranged on the shaft D; the shaft D is matched with a fixed seat C bearing arranged on the inner wall of the shell; the fixed seat C is provided with a gear B through a shaft, and the gear B is simultaneously meshed with the gear A and the gear C arranged on the shaft A. The trapezoidal guide block is matched with the trapezoidal guide groove to play a role in positioning and guiding the movement of the sliding block.

As a further improvement of the technology, one end of the sliding block, which is not provided with the friction plate, is connected with the inner wall of the shell through a telescopic rod, and the telescopic rod prevents the compressed return spring from bending, so that the situation that the compressed return spring bends to cause the resetting failure of the sliding block is avoided; the return spring is nested on the telescopic rod; the return spring is a compression spring; one end of the reset spring is connected with the sliding block, and the other end of the reset spring is connected with the inner wall of the shell; two fixed blocks are symmetrically arranged on two sides of the sliding block and are respectively connected with the thin steel wires wound on the two wire winding wheels.

As a further improvement of the technology, the transmission ratio of the gear A to the gear C is smaller than 1, and the transmission ratio of the gear D to the gear E is smaller than 1, so that the output shaft of the stepping motor drives the shaft B to rotate at a high speed through the gear A, the gear B, the gear C, the shaft A, the gear D and the gear E, the shaft B rotating at the high speed drives the limiting block in threaded fit with the shaft B to move rapidly in the vertical direction, and the height position of the limiting block is adjusted rapidly and effectively.

Compared with the traditional stamping die, the height position of the limiting block in the limiting mechanism arranged on the stamping die can be adjusted according to dies with different specifications; when the hydraulic column drives the die to downwards punch the material on the platform through the die holder, the limiting plate which synchronously moves with the hydraulic column just meets the limiting block and is limited by the limiting block to move downwards continuously, so that the die which has finished punching the material is prevented from moving downwards under the driving of the telescopic column continuously, the die is prevented from being extruded and deformed to be damaged due to the mutual extrusion of the die and the platform caused by the fact that the die moves downwards continuously, the service life of the die is prolonged, and the production cost of enterprises is reduced; compared with the guiding mechanism of the hardware stamping die with the patent number of CN 107745045, which adopts the driving motor and the stepping motor as the driving modes of the related structures, the invention can realize the same effect by only driving the stepping motor, and the operation is simple and convenient; compared with the effect of protecting the die by adopting two motors, the invention has only one stepping motor, thereby reducing the cost to a certain extent. In addition, the invention has simpler structure and higher practicability under the condition that only one stepping motor is used for driving; the invention has simple structure and better use effect.

Drawings

Fig. 1 is a schematic view of the entire apparatus.

Fig. 2 is a schematic diagram of the section of the limiting block, the limiting plate, the sliding sleeve and the supporting column.

Fig. 3 is a schematic sectional view of the stopper mechanism.

Fig. 4 is a partial sectional schematic view of the spacing mechanism.

FIG. 5 is a cross-sectional view showing the fitting of the winding wheel, the shaft C, the gear G, the gear F, the shaft D and the incomplete gear.

FIG. 6 is a cross-sectional view of the slider and the fixing base B.

FIG. 7 is a cross-sectional view of the single direction driving mechanism and the shaft A.

FIG. 8 is a schematic top view of the friction wheel, friction plate, slide block, fixing block, thin steel wire and wire-wound wheel.

Fig. 9 is a schematic top view of the assembly of the stopper, the housing, the stepping motor, the gear a, the incomplete gear, the gear B, and the gear C.

Fig. 10 is a schematic cross-sectional view of two unidirectional drive mechanisms engaged with a hub.

Fig. 11 is a schematic view of the components of the one-way drive mechanism.

Fig. 12 is a schematic perspective view of the housing.

Number designation in the figures: 1. a base; 2. a top plate; 3. a support pillar; 4. a platform; 5. a hydraulic pump; 6. a hydraulic column; 7. a die holder; 8. a mold; 10. a limiting plate; 11. a sliding sleeve; 12. connecting blocks; 13. a limiting mechanism; 14. a fixed seat A; 15. a housing; 16. a guide groove; 17. an axis A; 18. a gear C; 19. a gear D; 20. a friction wheel; 21. a one-way drive mechanism; 22. rotating the ring A; 23. a ring groove A; 24. a rotating ring B; 25. a ring groove B; 26. a clamping block B; 27. a fixing ring; 28. a clamping block A; 29. a volute spiral spring; 32. a gear E; 33. a shaft B; 34. a limiting block; 35. a friction plate; 36. a slider; 37. a trapezoidal guide block; 38. a fixed block; 39. a fixed seat B; 40. a trapezoidal guide groove; 41. a telescopic rod; 42. a return spring; 43. thin steel wires; 44. winding the wire wheel; 45. an axis C; 46. a gear G; 47. a gear F; 48. a shaft D; 49. an incomplete gear; 50. a fixed seat C; 51. a gear A; 52. a stepping motor; 53. a gear B; 54. and a shaft sleeve.

Detailed Description

The drawings are schematic illustrations of the implementation of the present invention to facilitate understanding of the principles of structural operation. The specific product structure and the proportional size are determined according to the use environment and the conventional technology.

As shown in fig. 1, 3 and 4, the hydraulic die comprises a base 1, a top plate 2, support columns 3, a platform 4, a hydraulic pump 5, hydraulic columns 6, a die holder 7, a die 8, a limit plate 10 and a limit mechanism 13, wherein as shown in fig. 1 and 2, the top plate 2 is arranged above the base 1 through four support columns 3 which are symmetrically distributed; a hydraulic pump 5 is arranged below the top plate 2, and a vertically telescopic hydraulic column 6 is arranged below the hydraulic pump 5; the lower end of the hydraulic column 6 is provided with a die holder 7, and the lower end of the die holder 7 is provided with a die 8; the mould 8 is matched with the platform 4 arranged on the base 1; the limiting plate 10 which moves synchronously with the extension and retraction of the hydraulic column 6 is matched with a limiting mechanism 13 arranged on the base 1.

As shown in fig. 3, 4 and 5, the limiting mechanism 13 includes a housing 15, a shaft a17, a friction wheel 20, a one-way driving mechanism 21, a shaft B33, a limiting block 34, a friction plate 35, a slider 36, a return spring 42, a thin steel wire 43, a wire winding wheel 44, a shaft C45, a shaft D48, an incomplete gear 49, a gear a51 and a stepping motor 52, wherein as shown in fig. 3 and 4, a vertical shaft a17 and a vertical shaft B33 are bearing-fitted in the housing 15; two one-way driving mechanisms 21 are mounted on the shaft A17, and the two one-way driving mechanisms 21 are connected through a shaft sleeve 54 rotating on the shaft A17; the shaft sleeve 54 is in transmission connection with the shaft B33; the external thread on the shaft B33 is in threaded fit with the threaded hole on the U-shaped limiting block 34; as shown in fig. 4 and 8, the limiting block 34 which axially slides vertically along the axis B33 is matched with the limiting plate 10; the slider 36 slides horizontally in the housing 15; one end of the sliding block 36 is provided with an arc-shaped friction plate 35, and the other end of the sliding block is in transmission connection with two winding wheels 44 symmetrically distributed on two sides of the sliding block through two thin steel wires 43 respectively, and the winding directions of the thin steel wires 43 on the two winding wheels 44 are opposite; the friction plate 35 is engaged with the friction wheel 20 mounted on the sleeve 54; a return spring 42 for returning the slide block 36 is arranged on the slide block; as shown in fig. 5, the axis C45 of each of the reels 44 is in driving connection with the axis D48 of the incomplete gear 49 installed in the casing 15; a stepping motor 52 is arranged on the inner wall of the shell 15; as shown in fig. 4 and 9, a gear a51 mounted on the output shaft of the stepping motor 52 is engaged with the incomplete gear 49; the output shaft of the stepper motor 52 is drivingly connected to the shaft A17.

As shown in fig. 10 and 11, the one-way driving mechanism 21 includes a rotating ring a22, a rotating ring B24, a fixture block B26, a fixed ring 27, a fixture block a28, and a spiral spring 29, wherein the rotating ring a22 whose end face is connected to one end of the shaft sleeve 54 rotates on a shaft a17 as shown in fig. 4 and 10; the rotating ring B24 rotating on the shaft A17 is embedded into the ring groove A23 on the inner wall of the shaft hole of the rotating ring A22; fixed ring 27 mounted on shaft A17 is fitted into annular groove B25 on the inner wall of the shaft hole of rotary ring B24; as shown in fig. 4, 7 and 11, the latch a28 mounted on the outer cylindrical surface of the fixing ring 27 is engaged with the latch B26 mounted on the inner wall of the ring groove B25; as shown in fig. 7 and 11, the outer cylindrical surface of the rotating ring B24 is fitted with a wrap spring 29 for returning it.

As shown in fig. 7, the spiral directions of the spiral spring 29 in the two unidirectional driving mechanisms 21 are opposite.

As shown in fig. 2, the limiting mechanism 13 is mounted on the base 1 through a fixing seat a 14; the limiting block 34 is arranged on the hydraulic column 6 through a connecting block 12; two sliding sleeves 11 are symmetrically installed at two ends of the limiting plate 10, and the two sliding sleeves 11 are respectively nested and slide on the two supporting columns 3. The matching of the sliding sleeve 11 and the supporting column 3 plays a positioning and guiding role in the vertical movement of the limiting plate 10.

As shown in fig. 9 and 12, the two legs of the stopper 34 slide vertically in the two guide grooves 16 on the side surface of the housing 15. The guide groove 16 plays a positioning and guiding role in the vertical movement of the stopper 34.

As shown in fig. 4, the sleeve 54 is provided with a gear D19, and a gear D19 is engaged with a gear E32 mounted on a shaft B33.

As shown in fig. 4 and 6, a fixing seat B39 is installed on the inner wall of the housing 15, and the trapezoidal guide block 37 installed at the lower end of the sliding block 36 slides in the trapezoidal guide groove 40 of the fixing seat B39; as shown in fig. 5, two shafts C45 are respectively bearing-fitted with the fixed seat B39; two shafts C45 are respectively provided with a gear G46, and two gears G46 are simultaneously meshed with a gear F47 arranged on a shaft D48; the shaft D48 is in bearing fit with a fixed seat C50 arranged on the inner wall of the shell 15; as shown in fig. 4, a gear B53 is mounted on the fixed seat C50 through a shaft, and a gear B53 is meshed with the gear a51 and a gear C18 mounted on the shaft a 17. The cooperation of the trapezoidal guide block 37 and the trapezoidal guide groove 40 plays a positioning and guiding role in the movement of the slide block 36.

As shown in fig. 4, the end of the slide block 36, on which the friction plate 35 is not mounted, is connected to the inner wall of the housing 15 through the expansion link 41, and the expansion link 41 prevents the compressed return spring 42 from bending, thereby avoiding the failure of the slide block 36 caused by the bending of the compressed return spring 42; the return spring 42 is nested on the telescopic rod 41; the return spring 42 is a compression spring; one end of the return spring 42 is connected with the slide block 36, and the other end is connected with the inner wall of the shell 15; two fixing blocks 38 are symmetrically arranged on two sides of the sliding block 36, and the two fixing blocks 38 are respectively connected with thin steel wires 43 wound on two winding wheels 44.

As shown in fig. 4 and 9, the transmission ratio of the gear a51 to the gear C18 is smaller than 1, and the transmission ratio of the gear D19 to the gear E32 is smaller than 1, so that it is ensured that the output shaft of the stepping motor 52 drives the shaft B33 to rotate at a high speed through the gear a51, the gear B53, the gear C18, the shaft a17, the gear D19 and the gear E32, and the shaft B33 rotating at a high speed drives the stopper 34 in threaded engagement with the stopper to move quickly in the vertical direction, thereby quickly and effectively completing the adjustment of the height position of the stopper 34.

The stepping motor 52 in the present invention is a conventional one, and the stepping motor 52 is electrically connected to the control system.

Under the matching action of the friction plate 35 and the friction wheel 20, when the height of the limiting block 34 is adjusted, the friction plate 35 is in friction fit with the friction wheel 20, and the rotation of the shaft A17 is limited; the gear E32 cannot rotate under the action of external force, the gear E32 cannot drive the shaft B33 to rotate, and the shaft B33 cannot drive the limiting block 34 in threaded fit with the shaft B to move in the vertical direction; so that the position of the adjusted stopper 34 is fixed.

As shown in FIG. 7, the latch A28 of the unidirectional driving mechanism 21 of the present invention rotates less than one turn relative to the latch B26, and the deformation of the spiral spring 29 therein is enough to drive the stopper 34 to move through a series of transmissions.

In the invention, when the stepping motor 52 drives the limit block 34 to vertically reach a position which is a fixed distance away from a target position through a series of transmission, the control system controls the stepping motor 52 to stop running, and after the stepping motor 52 stops running, the energy of the volute spiral spring 29 in the one-way driving mechanism 21 which previously plays a driving role is released; the energy-releasing volute spring 29 simultaneously drives the rotating ring A22 in the corresponding one-way driving mechanism 21 to continuously rotate, the rotating ring A22 drives the gear D19 to continuously rotate in the same direction through the shaft sleeve 54, the gear D19 drives the shaft B33 to continuously rotate through the gear E32, and the rotating shaft B33 drives the limiting block 34 in threaded fit with the rotating shaft B33 to continuously move to a target position to be debugged; meanwhile, the power-released spiral spring 29 drives the shaft a17 to rotate reversely by the corresponding rotating ring B24, latch B26, latch a28 and fixed ring 27; the dog a28 in the one-way drive mechanism 21, which has not been driven previously, approaches toward the corresponding dog B26; when the limiting block 34 reaches the target position under the driving of the energy-releasing spiral spring 29, the energy-releasing spiral spring 29 returns to the initial state, and the latch a28 in the unidirectional driving mechanism 21, which does not exert the driving function previously, comes into contact with the latch B26 again; the position of the limit block 34 just reaches the target position from the position where the stepping motor 52 stops operating, the stroke of the limit block 34 reaching the target position from the position where the stepping motor 52 stops operating serves as an advance, when the height of the limit block 34 is debugged each time, when the limit block 34 reaches the advance position, the stepping motor 52 stops operating, and in the process of resetting inside the limit mechanism 13, the limit block 34 automatically finishes the advance stroke and reaches the target position, and the debugging of the height of the limit block 34 is completed. Because the limiting block 34 is in threaded fit with the shaft B33, and the threaded fit has a self-locking function, the limiting block 34 is positioned at the target position and is not easy to displace; in order to avoid the rotation of the gear E32 under the action of external force, the rotating gear E32 drives the limit block 34 to move through the shaft B33; after the stepping motor 52 stops operating, when the interior of the limiting mechanism 13 is reset quickly, the friction plate 35 and the friction wheel 20 are contacted again and limit the rotation of the gear D19, so that the position of the limiting block 34 is further fixed, and the moving stroke of the die 8 for stamping is effectively limited. The specific numerical value of the advance before the limiting block 34 reaches the target position is obtained through a large number of tests.

The working process of the invention is as follows: in the initial state, the latches a28 in the two unidirectional driving mechanisms 21 are respectively in contact with the corresponding latches B26; the arc-shaped friction plate 35 is in complete contact with and friction fit with the friction wheel 20; gear a51 meshes with the tooth face center in the incomplete gear 49; the return spring 42 is compressed.

After the die 8 in the invention is replaced, the specification of the die 8 changes, and the effective stamping stroke of the replaced die 8 for completing single stamping is changed relative to stamping materials with the same specification, so that in order to avoid the damage of the die 8 caused by the mutual extrusion between the die 8 and the platform 4 because the actual stroke of the hydraulic pump 5 for driving the die 8 to move downwards through the hydraulic column 6 and the die holder 7 is larger than the stamping stroke, the height position of the limiting block 34 in the limiting mechanism 13 needs to be adjusted up and down, the stroke of the hydraulic column 6 is limited through the limiting plate 10, the stroke of the hydraulic column 6 for driving the die 8 to move downwards through the die holder 7 is controlled within a reasonable range corresponding to the die 8, and the hydraulic column 6 drives the die 8 through the die holder 7 to just complete stamping of the materials and then stops moving downwards; the adjustment process of the limiting block 34 in the limiting mechanism 13 is as follows:

the control system controls the stepping motor 52 to operate, and the stepping motor 52 drives the incomplete gear 49 to rotate through the gear A51; the incomplete gear 49 drives a gear F47 to synchronously rotate through a shaft D48; the gear F47 drives two gears G46 meshed with the gear F47 to rotate; the two gears G46 drive the coaxial winding wheels 44 to rotate through the corresponding shafts C45 respectively, and the rotation directions of the two winding wheels 44 are the same; since the winding directions of the thin steel wires 43 wound on the two winding wheels 44 are opposite, one winding wheel 44 continues to wind the thin steel wires 43, and the other winding wheel 44 discharges the thin steel wires 43 wound thereon; the winding wheel 44 which continues to wind the thin steel wire 43 pulls the sliding block 36 to slide along the trapezoidal guide groove 40 through the thin steel wire 43 and the corresponding fixed block 38, and the return spring 42 is further compressed; the slide block 36 drives the friction plate 35 to separate from the friction wheel 20 and release the rotation limitation of the friction wheel 20, so that the friction plate 35 and the friction wheel 20 do not interact with each other in the process of adjusting the limit block 34. When the gear A51 is meshed with the tooth surface of the incomplete gear 49, the gear A51 which rotates continuously stirs the tail end teeth of the incomplete gear 49 continuously, so that the incomplete gear 49 is kept in a basically static state and does not rotate continuously, the incomplete gear 49 can not drive the two winding wheels 44 to rotate continuously through the shaft D48, the gear F47, the two gears G46 and the two shafts C45, the slide block 36 is kept near a fixed position and does not move continuously, and the friction plate 35 is kept in a separation state with the friction wheel 20.

Meanwhile, the gear a51 drives the fixed rings 27 in the two unidirectional driving mechanisms 21 to synchronously rotate through the gear B53, the gear C18 and the shaft a17, the latch a28 on one fixed ring 27 is separated from the corresponding latch B26, the corresponding spiral spring 29 is not deformed, and the latch a28 on the other fixed ring 27 drives the corresponding rotating ring B24 to synchronously rotate through the latch B26; under the action of external load, rotating ring B24 rotating synchronously with shaft A17 drives corresponding volute spiral spring 29 to deform and store energy; when the deformation amount of the deformed scroll spring 29 reaches a certain level, the elastic force generated by the deformation of the scroll spring 29 is enough to drive the corresponding rotating ring a22 to rotate synchronously; at this time, the one-way drive mechanism 21 in which the deformed spiral spring 29 is located functions as a drive, and the other one-way drive mechanism 21 does not function as a drive; the rotating ring A22 in one-way driving mechanism 21 with driving function drives the rotating ring A22 in the other one-way driving mechanism 21 to synchronously rotate through the shaft sleeve 54, the rotating ring A22 drives the corresponding rotating ring B24 to synchronously rotate through the corresponding volute spiral spring 29, and the fixture block B26 follows the fixture block A28 to synchronously rotate; the latch A28 and the latch B26 in the unidirectional driving mechanism 21 which does not have the driving function do not move relatively any more and keep a certain distance to rotate synchronously; meanwhile, the rotating sleeve 54 drives the shaft B33 to rotate at a high speed through the gear D19 and the gear E32, and the shaft B33 drives the limit block 34 in threaded engagement with the shaft to move vertically upward or downward along the guide groove 16.

When the distance between the limiting block 34 and the target position is the advance, the control system controls the stepping motor 52 to stop running; at this time, by the return action of the deformed wrap spring 29, the rotary ring a22 in the one-way drive mechanism 21 that has previously performed the driving action continues to rotate, and the shaft a17 is reversed; since the stepping motor 52 has a braking torque, the shaft a17 drives the output shaft of the stepping motor 52 to slowly rotate reversely through the gear C18, the gear B53 and the gear a51 against the braking torque of the stepping motor 52; the latch a28 and the latch B26 in the unidirectional driving mechanism 21 which previously exerts the driving action are always kept in contact, and the latch a28 and the latch B26 in the unidirectional driving mechanism 21 which previously does not exert the driving action are quickly close to each other; the rotating ring A22 which continues to rotate drives the gear D19 to rotate continuously through the shaft sleeve 54; the gear D19 drives the limit block 34 to continue to move to the target position through the gear E32 and the shaft B33; when the limiting block 34 moves to the target position, the energy release of the spiral spring 29 is finished and the initial state is recovered, the latch a28 in the one-way driving mechanism 21 which does not exert the driving function before contacts with the latch B26 again, the rotating ring a22 in the two one-way driving mechanisms 21 stops rotating, and the shaft a17 stops rotating; at this time, under the reset action of the reset spring 42, the slider 36 is just reset, and the friction plate 35 is pressed again in contact with the friction wheel 20.

In the process of slow reverse rotation of the stepping motor 52, under the action of the return spring 42, the stepping motor 52 drives the incomplete gear 49 to slowly reverse and reset through the gear A51, and the incomplete gear 49 drives the two winding wheels 44 to reversely and slowly rotate through the shaft D48, the gear F47, the two gears G46 and the two shafts C45; the coiler 44 previously wound with the thin steel wire 43 slowly discharges the thin steel wire 43 wound thereon and slowly releases the restriction of the slider 36, and the coiler 44 previously discharging the thin steel wire 43 slowly winds the corresponding thin steel wire 43; the thin steel wire 43 which is slowly released is always kept in a tight state due to the action of the return spring 42, so that the sliding block 36 is pulled; the slide block 36 is slowly reset under the reset action of the reset spring 42 and the pulling of the tightened thin steel wire 43; when the energy-storing spiral spring 29 is completely restored, the limit block 34 just reaches the target position after the advance, the slide block 36 just resets, the friction plate 35 is contacted with the friction wheel 20 again and restores the friction fit, and the meshing of the gear A51 and the incomplete gear 49 restores the initial state.

After the position of the limiting block 34 is adjusted, the control system controls the hydraulic pump 5 to operate, the hydraulic pump 5 drives the hydraulic column 6 to extend, and the hydraulic column 6 drives the die 8 to move towards the stamping material on the platform 4 through the die holder 7 and complete stamping; when limiting plate 10 meets with stopper 34 of adjusting high along with hydraulic column 6 downstream, the punching press to the punching press material is just in time accomplished to mould 8, and stopper 34 passes through limiting plate 10 restriction flexible post and passes through die holder 7 and drive mould 8 and continue the downstream, avoids mould 8 and platform 4 to collide the extrusion and damage.

In conclusion, the invention has the beneficial effects that: the height position of the limiting block 34 in the limiting mechanism 13 arranged on the die can be adjusted according to dies 8 with different specifications; when the hydraulic column 6 drives the die 8 to downwards punch the material on the platform 4 through the die holder 7, the limiting plate 10 which moves synchronously with the hydraulic column 6 just meets the limiting block 34 and is limited by the limiting block 34 to move downwards continuously, so that the die 8 which finishes punching the material is prevented from moving downwards under the driving of the telescopic column continuously, the die 8 is prevented from being extruded and deformed to be damaged due to the mutual extrusion of the die 8 and the platform 4 caused by the continuous downward movement of the die 8, the service life of the die 8 is prolonged, and the production cost of enterprises is reduced; compared with the driving mode that the driving motor and the stepping motor 52 are used as related structures in the 'guide mechanism of the hardware stamping die 8' with the patent number of 'CN 107745045', the invention can realize the same effect by only driving one stepping motor 52, and is simple and convenient to operate; compared with the effect of protecting the mold 8 by adopting two motors, the invention only has one stepping motor 52, thereby reducing the cost to a certain extent. In addition, the present invention has a simple structure and high practicability when only one stepping motor 52 is used for driving.

Claims

1. A stamping die for mould protection which characterized in that: the hydraulic die comprises a base, a top plate, supporting columns, a platform, a hydraulic pump, a hydraulic column, a die holder, a die, a limiting plate and a limiting mechanism, wherein the top plate is arranged above the base through four symmetrically distributed supporting columns; a hydraulic pump is arranged below the top plate, and a vertically telescopic hydraulic column is arranged below the hydraulic pump; the lower end of the hydraulic column is provided with a die holder, and the lower end of the die holder is provided with a die; the mould is matched with a platform arranged on the base; the limiting plate which moves synchronously along with the extension of the hydraulic column is matched with a limiting mechanism arranged on the base;

the limiting mechanism comprises a shell, a shaft A, a friction wheel, a one-way driving mechanism, a shaft B, a limiting block, a friction plate, a sliding block, a reset spring, a thin steel wire, a wire winding wheel, a shaft C, a shaft D, an incomplete gear, a gear A and a stepping motor, wherein a vertical shaft A and a vertical shaft B are matched with a bearing in the shell; two one-way driving mechanisms are arranged on the shaft A and are connected through a shaft sleeve rotating on the shaft A; the shaft sleeve is in transmission connection with the shaft B; the external thread on the shaft B is in threaded fit with the threaded hole on the U-shaped limiting block; the limiting block which vertically slides along the axial direction of the shaft B is matched with the limiting plate; the sliding block horizontally slides in the shell; one end of the sliding block is provided with an arc-shaped friction plate, the other end of the sliding block is in transmission connection with two wire winding wheels which are symmetrically distributed on two sides of the sliding block through two thin steel wires respectively, and the winding directions of the thin steel wires on the two wire winding wheels are opposite; the friction plate is matched with a friction wheel arranged on the shaft sleeve; a return spring for returning the slide block is arranged on the slide block; the shaft C where each wire winding wheel is located is in transmission connection with the shaft D where the incomplete gear is located and installed in the shell; a stepping motor is arranged on the inner wall of the shell; a gear A arranged on an output shaft of the stepping motor is matched with the incomplete gear; the output shaft of the stepping motor is in transmission connection with the shaft A;

the one-way driving mechanism comprises a rotating ring A, a rotating ring B, a fixture block B, a fixed ring, a fixture block A and a volute spiral spring, wherein the rotating ring A with the end surface connected with one end of the shaft sleeve rotates on the shaft A; the rotating ring B rotating on the shaft A is embedded into the ring groove A on the inner wall of the shaft hole of the rotating ring A; the fixed ring arranged on the shaft A is embedded into the ring groove B on the inner wall of the shaft hole of the rotating ring B; the clamping block A arranged on the outer cylindrical surface of the fixing ring is matched with the clamping block B arranged on the inner wall of the annular groove B; the outer cylindrical surface of the rotating ring B is nested with a volute spiral spring for resetting the rotating ring B;

the spiral directions of the spiral springs in the two one-way driving mechanisms are opposite;

two legs of the limiting block vertically slide in two guide grooves on the side surface of the shell;

the shaft sleeve is provided with a gear D which is meshed with a gear E arranged on the shaft B;

a fixed seat B is arranged on the inner wall of the shell, and a trapezoidal guide block arranged at the lower end of the sliding block slides in a trapezoidal guide groove on the fixed seat B; the two shafts C are respectively matched with the bearings of the fixed seat B; the two shafts C are respectively provided with gears G, and the two gears G are simultaneously meshed with a gear F arranged on the shaft D; the shaft D is matched with a fixed seat C bearing arranged on the inner wall of the shell; a gear B is arranged on the fixed seat C through a shaft and is simultaneously meshed with the gear A and the gear C arranged on the shaft A;

one end of the sliding block, which is not provided with the friction plate, is connected with the inner wall of the shell through a telescopic rod; the return spring is nested on the telescopic rod; the return spring is a compression spring; one end of the reset spring is connected with the sliding block, and the other end of the reset spring is connected with the inner wall of the shell; two fixing blocks are symmetrically arranged on two sides of the sliding block and are respectively connected with the thin steel wires wound on the two wire winding wheels;

the transmission ratio of the gear A to the gear C is less than 1, and the transmission ratio of the gear D to the gear E is less than 1.