CN211074045U

CN211074045U - Production equipment with bottom for inspection well

Info

Publication number: CN211074045U
Application number: CN201921829872.3U
Authority: CN
Inventors: 孟全力; 闫富杰; 王凌欣
Original assignee: Zhengzhou Huitong Cement Pre Products Co ltd
Current assignee: Zhengzhou Huitong Cement Pre Products Co ltd
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2020-07-24
Anticipated expiration: 2029-10-25

Abstract

The utility model relates to an inspection shaft production facility with bottom, it includes the gallows, installs the mould on the gallows, and the mould includes centre form and external mold, and the centre form is columniform, the external mold is provided with connecting device including two arcs of relative setting piece and two connecting plates that are located two arc piece junctions, between two arcs, the inside of centre form is provided with drive centre form pivoted drive arrangement, be connected with elevating gear on the gallows, elevating gear can dismantle the connection on the centre form, and drive arrangement connects on elevating gear. The utility model discloses have the convenient effect of deviating from to centre form and external mold that the pouring inspection shaft was used.

Description

Production equipment with bottom for inspection well

Technical Field

The utility model belongs to the technical field of an inspection shaft production facility's technique and specifically relates to an inspection shaft production facility with bottom is related to.

Background

The inspection well is an important component in the underground pipeline, and plays an important role in the function exertion, maintenance, environmental protection and life quality guarantee of urban residents of the whole underground pipeline. The method can be used in pipeline systems of drainage, pollution discharge, tap water, gas, heat, power, telecommunication and the like, and has wide application. The prefabricated assembled concrete inspection well is produced in a factory in a scale mode, so that the product quality is easy to control, the field installation time is short, the prefabricated assembled concrete inspection well is not influenced by field weather and construction conditions, and the concrete and the whole inspection well are high in compressive strength and good in durability.

Patent document No. CN104742250B discloses a concrete manhole forming mold with a base, which includes an inner mold and an outer mold, wherein one end of the inner mold has a bottom, the end of the inner mold without the bottom is connected to the outer mold through a hydraulic cylinder, the inner mold and the outer mold are poured to form a manhole, and the inner mold and the outer mold are removed together along the central line direction of the inner mold and the outer mold.

However, in the above structure, when the inner mold and the outer mold are pulled out together, the inspection well is sandwiched between the inner mold and the outer mold, and the pulling out of the inspection well is difficult.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an inspection shaft production facility with bottom, it has the convenient effect of deviating from to centre form and external mold for pouring inspection shaft.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides an inspection shaft production facility with bottom, includes the gallows, installs the mould on the gallows, and the mould includes centre form and external mold, and the centre form is columniform, the external mold is provided with connecting device including relative two arc pieces that set up and two connecting plates that are located two arc piece junctions, between two arc pieces, the inside of centre form is provided with drive centre form pivoted drive arrangement, be connected with elevating gear on the gallows, elevating gear can dismantle the connection on the centre form, and drive arrangement connects on elevating gear.

Through adopting above-mentioned technical scheme, during the use, install elevating gear on the crane span, elevating gear can dismantle with the centre form and be connected to be provided with drive centre form pivoted drive arrangement in the inside of centre form, drive arrangement is connected with elevating gear, and when drive arrangement drove the centre form and rotate, elevating gear demolds the centre form simultaneously, and connecting device separates two arcs piece mutually outward and carries out the drawing of patterns, thereby makes centre form and external mold conveniently deviate from after having poured the inspection shaft.

The utility model discloses further set up to: the lifting device comprises a movable beam and a fixed rod arranged in the middle of the movable beam, a circular plate and a pulling plate are arranged at the lower end of the fixed rod, the circular plate is fixed on the fixed rod and is positioned below the pulling plate, the pulling plate is rotatably connected with the fixed rod, an installation plate is arranged in the inner mold, a through hole is formed in the installation plate, the through hole is matched with the circular plate, and the installation plate is detachably connected with the pulling plate; the movable beam is in sliding fit with the hanger, and the movable beam is connected with a jacking oil cylinder.

Through adopting above-mentioned technical scheme, the lower extreme of dead lever is provided with plectane and arm-tie, and the plectane cooperates with the through-hole, makes the center of centre form plectane rotate, can dismantle between arm-tie and the mounting panel and be connected, and when arm-tie and mounting panel were fixed, the arm-tie rotated along with the centre form on the dead lever, and rethread jacking cylinder upwards promotes the walking beam to accomplish upwards promoting of centre form and draw.

The utility model discloses further set up to: the driving device comprises a driving gear, a driven gear and a driving motor, the driving gear is rotatably supported on the mounting plate, the driving motor is fixed on the mounting plate, the driving gear is coaxially fixed on an output shaft of the driving motor, the driven gear is installed at the lower end of the fixed rod and located below the circular plate, the fixed rod is inserted into the through hole, and the driving gear is meshed with the driven gear.

Through adopting above-mentioned technical scheme, driving motor starts, and driving motor drives the driving gear at driven gear's circumferential direction to make driving motor rotate along with the driving gear, and then drive the centre form and rotate round the dead lever.

The utility model discloses further set up to: the connecting device comprises a die sinking oil cylinder and a guide rod, a guide hole is formed in the connecting plate, the length direction of the guide hole is perpendicular to the central line of the outer die, the guide rod is in sliding fit in the guide hole, and the guide rod is fixed on the outer side of the arc-shaped piece; the output direction of the die sinking oil cylinder is parallel to the length direction of the guide rod, and the die sinking sliding cylinder is propped against the arc-shaped sheet.

By adopting the technical scheme, when the die opening sliding cylinder works, the die opening oil cylinder extends out, and the die opening oil cylinder pushes the arc-shaped sheets to move towards the direction far away from the connecting plate, so that the two arc-shaped sheets are relatively opened, and the outer die is convenient to separate.

The utility model discloses further set up to: and the bottom and the side wall of the inner die are both provided with vibrating devices, the hanging bracket is provided with a turnover device, and the turnover device is connected with the outer die.

Through adopting above-mentioned technical scheme, vibrating device carries out closely knit with the outside concrete of pouring of centre form, and turning device can be in the below with the inspection shaft bottom after the pouring simultaneously, makes things convenient for the drawing of patterns of inspection shaft, reduces the deformation after the inspection shaft drawing of patterns simultaneously.

The utility model discloses further set up to: the turnover device comprises a driving oil cylinder, a rack and a gear, wherein the rack is in sliding fit with the hanger, the driving oil cylinder is fixed on the hanger, the output end of the driving oil cylinder is fixed on the rack, a rotating shaft is arranged on the connecting plate and rotatably supported on the hanger, the rotating shaft is horizontally arranged, the gear is coaxially fixed on the rotating shaft, and the rack is meshed with the gear.

By adopting the technical scheme, when the driving oil cylinder works, the output end of the driving oil cylinder drives the rack to move, and the rack drives the gear to rotate, so that the rotating shaft and the outer die rotate, and the outer die is conveniently turned over.

The utility model discloses further set up to: the hanger is provided with a T-shaped groove, the rack is provided with a T-shaped strip, and the T-shaped strip is in sliding fit with the T-shaped groove; a positioning block is arranged in the T-shaped groove, the positioning block is in threaded connection with a screw, and a nut of the screw is located on the outer side of the T-shaped groove.

By adopting the technical scheme, the positioning block is arranged in the T-shaped groove, the positioning block is connected with the screw, the positioning block is fixed in the T-shaped groove by the screw, and the positioning block can be movably positioned along the T-shaped groove, so that the maximum moving position of the T-shaped strip is supported on the positioning block, and the rotating angle of the outer die can be conveniently adjusted after the positioning block is adjusted.

The utility model discloses further set up to: an air inlet is formed in the bottom of the inner die, a plug is arranged in the air inlet, and the plug is connected with a hydraulic oil cylinder.

By adopting the technical scheme, the air inlet is arranged at the bottom of the inner die, and after the air inlet is opened through the hydraulic oil cylinder, when the inner die is separated outwards, air enters between the inner die and the outer die, so that the inner die can be conveniently demoulded.

The utility model discloses further set up to: and a flange is arranged at one end of the inner die, which is far away from the bottom of the inner die, and the flange is annular, and the inner diameter of the flange is equal to the outer diameter of the outer die.

By adopting the technical scheme, the end of the inner mold, which is far away from the bottom of the inner mold, is provided with the flange, and when the outer mold is installed on the inner mold, the flange is blocked on the outer wall of the outer mold, so that the outer mold and the inner mold are connected firmly, and the outer mold is prevented from falling off from the inner mold when concrete is poured between the inner mold and the outer mold.

To sum up, the utility model discloses a beneficial technological effect does:

1. the lifting device is arranged on the lifting frame and detachably connected with the inner mold, the driving device for driving the inner mold to rotate is arranged in the inner mold and connected with the lifting device, when the driving device drives the inner mold to rotate, the lifting device simultaneously demolds the inner mold, and the connecting device separates the two arc-shaped sheets from each other for demolding, so that the inner mold and the outer mold can be conveniently separated after the inspection well is poured;

2. when the die opening sliding cylinder works, the die opening oil cylinder extends out and pushes the arc-shaped sheets to move towards the direction far away from the connecting plate, so that the two arc-shaped sheets are relatively opened, and the outer die is convenient to separate;

3. closely knit the concrete of centre form outside pouring through vibrating device, turning device can be in the below with the inspection shaft bottom after the pouring simultaneously, makes things convenient for the drawing of patterns of inspection shaft, reduces the deformation after the inspection shaft drawing of patterns simultaneously.

Drawings

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

FIG. 2 is an enlarged partial schematic view of portion A of FIG. 1;

FIG. 3 is a schematic view of a half-section of a mold;

FIG. 4 is a schematic structural view of an outer mold;

FIG. 5 is an enlarged partial schematic view of portion B of FIG. 3;

FIG. 6 is a schematic view of the turning device;

fig. 7 is a partially enlarged schematic view of a portion C in fig. 3.

In the figure, 1, a hanger; 11. a cross beam; 12. hoisting a column; 13. connecting lugs; 2. a mold; 21. an inner mold; 22. an outer mold; 221. an arc-shaped sheet; 222. a connecting plate; 223. a guide hole; 224. a guide bar; 225. opening the mould oil cylinder; 23. a bottom template; 24. pouring a space; 25. a socket tray; 26. blocking edges; 3. a turning device; 31. a driving oil cylinder; 32. a rack; 33. a gear; 34. t-shaped strips; 35. a T-shaped slot; 36. positioning blocks; 37. a screw; 38. a rotating shaft; 4. a clamping device; 41. briquetting; 42. clamping the oil cylinder; 5. a vibrating device; 51. a vibration motor; 52. a polarizing block; 6. an air inlet; 61. a plug; 62. a hydraulic cylinder; 63. a vent; 64. an air tube; 7. mounting a plate; 71. a through hole; 81. a driving gear; 82. a drive motor; 83. a driven gear; 84. a circular plate; 85. pulling a plate; 851. a fixing hole; 852. locking the oil cylinder; 86. fixing the rod; 9. a moving beam; 91. a slide hole; 92. and (4) a jacking oil cylinder.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, for the utility model discloses an inspection shaft production facility with bottom, including gallows 1, the lower part of gallows 1 is provided with mould 2, and mould 2 gyration is supported on gallows 1, and mould 2 is the axis of rotation level setting on gallows 1, and fixed turning device 3 that is provided with on gallows 1, turning device 3 are used for driving mould 2 vertical rotation 180 degrees, make mould 2 overturn from top to bottom.

Referring to fig. 1 and 3, the mold 2 includes an inner mold 21, an outer mold 22 and a bottom mold plate 23, the inner mold 21 is cylindrical and barrel-shaped, the inner mold 21 has a smaller diameter than the inner diameter of the outer mold 22, and the outer mold 22 is sleeved outside the inner mold 21 and is arranged coaxially with the inner mold 21, so that a casting space 24 is formed between the inner mold 21 and the outer mold 22. The inner die 21 is provided with a socket disc 25 far away from the bottom of the inner die 21, the socket disc 25 is fixed on the inner die 21, the outer edge of the socket disc 25 is provided with a flange 26, the flange 26 is annularly positioned on one surface of the socket disc 25 close to the bottom of the inner die 21, one end of the outer die 22 far away from the bottom of the inner die 21 is inserted into the flange 26, and the outer wall of the outer die 22 is attached to the inner side wall of the flange 26, so that the inner die 21 and the outer die 22 are firmly connected. When the concrete pouring device is used, the bottom of the inner die 21 is placed on the ground upwards, one end, opposite to the flange 26, of the outer die 22 is vertically inserted into the flange 26 downwards, the height of the upper end of the outer die 22 is higher than that of the bottom of the inner die 21, concrete is poured in the pouring space 24, the bottom die plate 23 covers one end, close to the bottom of the inner die 21, of the outer die 22, the clamping device 4 is arranged on the outer die 22, and the bottom die plate 23 is clamped and fixed in the outer die 22 through the clamping device 4. Referring to fig. 2, the plurality of clamping devices 4 are uniformly distributed in the circumferential direction of the outer die 22. The clamping device 4 comprises a pressing block 41 and a clamping oil cylinder 42, one end of the pressing block 41 is hinged to the outer die 22, the other end of the pressing block 41 faces the center of the outer die 22, one end of the clamping oil cylinder 42 is hinged to the middle of the pressing block 41, the other end of the clamping oil cylinder is hinged to the outer die 22, when the clamping oil cylinder 42 contracts, one end of the pressing block 41, which faces the center of the outer die 22, can be extruded on the edge of the bottom die plate 23, and the bottom die plate.

Referring to fig. 3, a vibration device 5 is arranged on the inner side wall of the inner mold 21, the vibration device 5 comprises a vibration motor 51 and a polarization block 52, the rotation speed of the vibration motor 51 is adjustable, the polarization block 52 is connected to the output end of the vibration motor 51, and when the vibration motor 51 works, the vibration device 5 vibrates on the inner mold 21 to make the concrete in the pouring space 24 vibrate and compact; at least one vibration device 5 is installed at the bottom of the inner mold 21, and the vibration device 5 located at the bottom of the inner mold 21 is operated when concrete is poured over the bottom of the inner mold 21.

Referring to fig. 4, the outer mold 22 includes two opposite arc-shaped pieces 221 and two connecting plates 222, each arc-shaped piece 221 is semicircular, the two arc-shaped pieces 221 are opposite to each other to form a cylinder, the two connecting plates 222 are respectively located at the joint of the two arc-shaped pieces 221, a guide hole 223 is formed in each connecting plate 222, the guide hole 223 is perpendicular to the center line of the outer mold 22 and is parallel to the connecting line of the centers of the two arc-shaped pieces 221, a plurality of guide holes 223 are formed in each connecting plate 222, a guide rod 224 is arranged in each guide hole 223, the guide rod 224 is in sliding fit with the guide hole 223, one end of each guide rod 224 is fixed on the outer side of each arc-shaped piece 221, and at least one guide rod 224 is connected to each of the two ends of each arc-shaped piece 221, so that the two arc-shaped pieces 221 slide along the length direction. A mold opening oil cylinder 225 is arranged in the connecting plate 222, the output direction of the mold opening oil cylinder 225 is parallel to the length direction of the guide rod 224, two ends of each arc piece 221 are respectively provided with one mold opening oil cylinder 225, and when the mold opening oil cylinders 225 extend out, the two arc pieces 221 can be relatively opened to remove the outer mold 22.

Referring to fig. 1 and 4, before demolding, the outer mold 22, the inner mold 21 and the bottom mold plate 23 need to be turned by 180 degrees by the turning device 3 so that the bottom mold plate 23 is placed on the ground. The hanger 1 comprises a cross beam 11 and two vertical hanging columns 12, the cross beam 11 is fixed at the upper ends of the hanging columns 12, and connecting lugs 13 are arranged at the upper ends of the cross beam 11, so that the hanger 1 can be conveniently and vertically hung upwards. The connecting plate 222 is fixedly provided with a rotating shaft 38, and the rotating shaft 38 horizontally penetrates through the suspension post 12, so that the rotating shaft 38 is rotatably supported on the suspension post 12. Referring to fig. 6, the turnover device 3 includes a driving cylinder 31, a rack 32 and a gear 33, the gear 33 is coaxially fixed at an end of a rotating shaft 38, the rack 32 is vertically disposed, a T-shaped strip 34 is disposed on the rack 32, a length direction of the T-shaped strip 34 is parallel to a length direction of the rack 32, a T-shaped groove 35 is disposed on the suspension post 12, the T-shaped strip 34 is slidably fitted in the T-shaped groove 35, the driving cylinder 31 is fixed on the suspension post 12, an output end of the driving cylinder 31 is fixed at one end of the rack 32, when the driving cylinder 31 works, the driving cylinder 31 drives the rack 32 to move along the length direction of the T-shaped groove 35, so that the gear 33 drives the rotating shaft. A positioning block 36 is arranged in the T-shaped groove 35, the positioning block 36 is in threaded connection with a screw 37, the nut of the screw 37 is located on the outer side of the T-shaped groove 35, when the screw 37 is loosened, the positioning block 36 moves along the length direction of the T-shaped groove 35, the maximum moving distance of the rack 32 is conveniently adjusted, the rotating angle of the rotating shaft 38 is fixed at 180 degrees, and after the adjustment, the screw 37 is tightened, so that the positioning block 36 is fixed in the T-shaped groove 35 by the screw 37.

Referring to fig. 3 and 5, an air inlet 6 is formed in the bottom of the inner mold 21, a plug 61 is arranged at the air inlet 6, the plug 61 is connected with a hydraulic oil cylinder 62, the hydraulic oil cylinder 62 is fixed at the bottom of the inner mold 21, the plug 61 is installed at the output end of the hydraulic oil cylinder 62, and when the hydraulic oil cylinder 62 contracts, the plug 61 moves from the air inlet 6 to the inside of the inner mold 21. The side wall of the air inlet 6 is provided with an air vent 63, the air vent 63 is connected with an air pipe 64, and the air pipe 64 is connected with an air source. When the inner mold 21 is removed from the mold, the plug 61 is opened, and pressurized gas is introduced between the outer side of the inner mold 21 and the inner side of the outer mold 22 through the gas pipe 64, the vent 63, and the gas inlet 6.

Referring to fig. 3 and 7, an installation plate 7 is arranged on the inner side wall of one end of the inner die 21, which is far away from the bottom of the inner die 21, the installation plate 7 is fixed on the inner die 21, a through hole 71 is formed in the installation plate 7, a driving gear 81 is arranged on one side, which is close to the bottom of the inner die 21, of the installation plate 7, the driving gear 81 is rotatably supported on the installation plate 7, the axis of the driving gear 81 is parallel to the central line of the inner die 21, the driving gear 81 is connected to a driving motor 82, the driving gear 81 is coaxially fixed at the output. The movable beam 9 is arranged on the two suspension posts 12, the movable beam 9 is provided with a sliding hole 91, the movable beam 9 is sleeved on the suspension posts 12 through the sliding hole 91, the sliding hole 91 is in sliding fit with the suspension posts 12, the suspension posts 12 are fixedly provided with jacking oil cylinders 92, the jacking oil cylinders 92 are vertically arranged upwards, the output ends of the jacking oil cylinders 92 are fixed on the movable beam 9, and when the jacking oil cylinders 92 extend, the movable beam 9 moves upwards along the length direction of the suspension posts 12. A fixed rod 86 is fixedly arranged in the middle of the movable beam 9, the fixed rod 86 is vertically downward, the center line of the fixed rod 86 is overlapped with the center line of the inner die 21, and the lower end of the fixed rod 86 is provided with a driven gear 83. When the bottom of the inner mold 21 is directed downward, the driven gear 83 moves downward to engage with the driving gear 81. A circular plate 84 and a pulling plate 85 are sequentially arranged above the driven gear 83, the outer diameter of the circular plate 84 is equal to the inner diameter of the through hole 71, the circular plate 84 is fixed on the fixing rod 86, the center line of the circular plate 84 is overlapped with the center line of the fixing rod 86, the pulling plate 85 is rotatably connected to the fixing rod, a plurality of fixing holes 851 are formed in the side wall of the pulling plate 85, and the fixing holes 851 are uniformly distributed in the circumferential direction of the pulling plate 85. A plurality of lock cylinders 852 corresponding to the fixing holes 851 are fixedly provided on the mounting plate 7, and output ends of the lock cylinders 852 are directed to the fixing holes 851.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides an inspection shaft production facility with bottom, includes gallows (1), installs mould (2) on gallows (1), and mould (2) are including centre form (21) and external mold (22), and centre form (21) are columniform barrel-shaped, its characterized in that: the outer mould (22) is provided with connecting device including two arc pieces (221) that set up relatively and two connecting plates (222) that are located two arc pieces (221) junction, between two arc pieces (221), the inside of centre form (21) is provided with drive centre form (21) pivoted drive arrangement, be connected with elevating gear on gallows (1), elevating gear can dismantle the connection on centre form (21), and drive arrangement connects on elevating gear.

2. Manhole production plant with bottom according to claim 1, characterized in that: the lifting device comprises a movable beam (9) and a fixed rod (86) arranged in the middle of the movable beam (9), a circular plate (84) and a pulling plate (85) are arranged at the lower end of the fixed rod (86), the circular plate (84) is fixed on the fixed rod (86) and located below the pulling plate (85), the pulling plate (85) is rotatably connected with the fixed rod (86), an installation plate (7) is arranged in the inner die (21), a through hole (71) is formed in the installation plate (7), the through hole (71) is matched with the circular plate (84), and the installation plate (7) is detachably connected with the pulling plate (85); the movable beam (9) is in sliding fit with the hanger (1), and the movable beam (9) is connected with a jacking oil cylinder (92).

3. Manhole production plant with bottom according to claim 2, characterized in that: the driving device comprises a driving gear (81), a driven gear (83) and a driving motor (82), the driving gear (81) is rotatably supported on the mounting plate (7), the driving motor (82) is fixed on the mounting plate (7), the driving gear (81) is coaxially fixed on an output shaft of the driving motor (82), the driven gear (83) is installed at the lower end of a fixing rod (86) and located below the circular plate (84), the fixing rod (86) is inserted into the through hole (71), and the driving gear (81) is meshed with the driven gear (83).

4. Manhole production plant with bottom according to claim 1, characterized in that: the connecting device comprises a die sinking oil cylinder (225) and a guide rod (224), a guide hole (223) is formed in the connecting plate (222), the length direction of the guide hole (223) is perpendicular to the central line of the outer die (22), the guide rod (224) is in sliding fit in the guide hole (223), and the guide rod (224) is fixed on the outer side of the arc-shaped sheet (221); the output direction of the die sinking oil cylinder (225) is parallel to the length direction of the guide rod (224), and the die sinking sliding cylinder is propped against the arc-shaped sheet (221).

5. Manhole production plant with bottom according to claim 1, characterized in that: the bottom and the side wall of the inner die (21) are provided with vibrating devices (5), the hanging bracket (1) is provided with a turnover device (3), and the turnover device (3) is connected with the outer die (22).

6. Manhole production plant with bottom according to claim 5, wherein: the turnover device (3) comprises a driving oil cylinder (31), a rack (32) and a gear (33), wherein the rack (32) is in sliding fit with the hanger (1), the driving oil cylinder (31) is fixed on the hanger (1), the output end of the driving oil cylinder (31) is fixed on the rack (32), a rotating shaft (38) is arranged on the connecting plate (222), the rotating shaft (38) is rotatably supported on the hanger (1), the rotating shaft (38) is horizontally arranged, the gear (33) is coaxially fixed on the rotating shaft (38), and the rack (32) is meshed with the gear (33).

7. Manhole production plant with bottom according to claim 6, wherein: a T-shaped groove (35) is formed in the hanger (1), a T-shaped strip (34) is arranged on the rack (32), and the T-shaped strip (34) is in sliding fit in the T-shaped groove (35); a positioning block (36) is arranged in the T-shaped groove (35), the positioning block (36) is in threaded connection with a screw (37), and a nut of the screw (37) is located on the outer side of the T-shaped groove (35).

8. Manhole production plant with bottom according to claim 6, wherein: an air inlet (6) is formed in the bottom of the inner die (21), a plug (61) is arranged in the air inlet (6), and the plug (61) is connected with a hydraulic oil cylinder (62).

9. Manhole production plant with bottom according to claim 1, characterized in that: one end of the inner die (21) far away from the bottom of the inner die (21) is provided with a flange (26), the flange (26) is annular, and the inner diameter of the flange (26) is equal to the outer diameter of the outer die (22).