CN220216658U - Quick forming device for producing tin bars - Google Patents

Abstract

The utility model discloses a rapid forming device for producing tin bars, which relates to the field of tin bar processing and comprises a supporting mechanism, a die arranged on the supporting mechanism and an ejection mechanism for ejecting cooled tin bars, wherein a user can eject the tin bars which are poured and cooled and formed from the die by utilizing the ejection mechanism, and the tin bars can be poured into the idle die again while waiting for cooling of the tin bars poured later, so that the working time is saved, and the working efficiency is improved.

Description

Quick forming device for producing tin bars

Technical Field

The utility model relates to the field of tin bar processing, in particular to a rapid forming device for producing tin bars.

Background

The tin bar is generally formed by pouring molten tin into a tin bar pouring mold through a tin pot, a plurality of mold cavities are formed in the mold, molten tin liquid is cooled and formed in the mold cavities, and then the tin bar is taken out from the mold cavities to finish processing and preparation of the tin bar.

The utility model discloses a thimble of a tin bar pouring die, which comprises a thimble body and a switch, wherein the thimble body is controlled to pop out by the switch, so that a tin bar is ejected out and separated from a die cavity.

In the prior art, the ejector pin body is controlled to eject through the switch so as to eject the tin bar, and the defect is that the cooling and forming time of molten tin in each mold cavity is different due to the sequence of pouring molten tin into the mold cavity. In the prior art shown above, the ejector pin body ejects out and ejects out the tin bars in all the die cavities at the same time, if the molten tin liquid poured in after part is not sufficiently cooled, the tin bars which are not sufficiently cooled are easily adhered in the die cavities and are easily damaged by the ejector pins, so that the rejection rate is increased. If the user ejects the tin bars by using the ejector pin body after the tin bars are formed by fully cooling all the tin liquid, the working time is wasted, and the production efficiency is reduced.

Disclosure of Invention

To the not enough of prior art, in order to make the tin bar in time be ejecting by the thimble after fully cooling, do not receive the order influence that molten tin liquid poured into moreover, reduce the rejection rate, improve production efficiency, this application provides a quick shaping device that production tin bar was used.

The application provides a quick forming device that production tin bar was used adopts following technical scheme:

the utility model provides a quick forming device that production tin bar was used, includes supporting mechanism, install in mould on the supporting mechanism and be used for ejecting the ejection mechanism of cooling tin bar, the mould deviates from one side of supporting mechanism has seted up a plurality of bar die cavity, ejection mechanism is including corresponding the vertical ejector pin that runs through of a plurality of die cavity setting and a plurality of install in transmission assembly on the supporting mechanism, transmission assembly is used for promoting the ejector pin is ejecting the die cavity with cooling tin bar.

Through adopting above-mentioned technical scheme, the tin liquid that pours into in the die cavity earlier can fully cool off earlier and form the tin strip, utilizes a plurality of ejector pin and drive assembly, can be ejecting with the tin strip of pouring earlier, when waiting for the tin liquid cooling of follow-up pouring, can continue pouring the tin liquid once more into the die cavity that has ejected the tin strip and be idle to save operating time, improve work efficiency.

Optionally, the supporting mechanism is including locating the axostylus axostyle on the supporting mechanism, the axostylus axostyle is followed the direction that the ejector pin distributes extends, drive assembly is including the cover locating a plurality of sleeve of the periphery side of axostylus axostyle, the sleeve is close to one side fixed connection roof of ejector pin, the roof with the ejector pin is kept away from the one end butt of die cavity, the sleeve deviates from one side fixedly connected with press frame of roof.

Through adopting above-mentioned technical scheme, the user presses down the pressure frame, and the pressure frame drives the sleeve and rotates around the center pin of axostylus axostyle, and during the sleeve rotated around the center pin of axostylus axostyle, the roof rotated and promoted the ejector pin along the sleeve, and the ejector pin stretches into the die cavity along the direction of vertically running through the mould and jack-up cooling tin bar.

Optionally, one side of roof deviates from the ejector pin is connected with the extension spring, the extension spring keep away from the one end of roof with supporting mechanism articulates.

By adopting the technical scheme, when a user presses the pressing frame, the top plate rotates towards the direction close to the die, so that the tension spring is pulled and deformed; when the user loosens the press frame, thereby the extension spring shrink pulls the roof to the normal position in the direction of keeping away from the mould, realizes that drive assembly can automatic re-setting after every use, and the continuous operation of user's of being convenient for improves production efficiency.

Optionally, the pressure frame is kept away from telescopic one end articulates there is the connecting rod, the connecting rod is kept away from one side of pressure frame articulates there is the pedal lever, the one end of pedal lever with supporting mechanism articulates, the pedal lever is kept away from supporting mechanism's one end is connected with the footboard.

Through adopting above-mentioned technical scheme, user accessible tramples the footboard to make the pedal lever rotate around the articulated shaft of pedal lever and supporting mechanism in the direction of keeping away from the mould, drive the connecting rod and move in the direction of keeping away from the mould, thereby drive the pressure frame and move in the direction of keeping away from the mould, be equivalent to user's pressure frame that pushes down, the person's operation of facilitating the use improves production efficiency.

Optionally, the supporting mechanism including install in supporting mechanism's gag lever post, the ejector pin keep away from the one end of mould runs through perpendicularly the gag lever post and with drive mechanism butt, the periphery side of ejector pin is connected with the spacing ring, the cross-sectional area of spacing ring is greater than the ejector pin runs through the cross-sectional area of the hole of gag lever post, the spacing ring be located the mould with between the gag lever post and with gag lever post butt.

By adopting the technical scheme, as the cross section area of the limiting ring is larger than the cross section area of the hole of the ejector rod penetrating through the limiting rod, the limiting ring is limited by the limiting rod, so that the ejector rod cannot penetrate through the limiting rod to separate from the limiting rod and the die, and the loss of the ejector rod is prevented.

Optionally, the periphery side cover of ejector pin is equipped with the pressure spring, pressure spring one end with the mould is close to one side butt of support frame, the pressure spring keep away from the one end of mould with the spacing ring butt.

By adopting the technical scheme, when a user moves the ejector rod towards the direction of the die through the transmission assembly and stretches out of the die cavity, the pressure spring is compressed by the die and the limiting ring; after the transmission assembly is released by a user, the pressure spring rebounds to push the limiting ring to move in the direction away from the die until the limiting ring is abutted with the limiting rod, the ejector rod is driven to retract from the die cavity, the ejector rod pushes the transmission assembly to return to the original position, automatic reset of the ejector rod and the transmission assembly after each use is realized, continuous operation of the user is facilitated, and production efficiency is improved.

Optionally, a cavity for containing cooling water is formed in the die, and a water inlet pipe and a water outlet pipe which are communicated with the cavity are arranged on the outer periphery side of the die.

Through adopting above-mentioned technical scheme, utilize inlet tube and outlet pipe to let in circulating cooling water to the cavity, take away heat through the cooling water to make the molten tin liquid in the die cavity cool off the shaping fast.

Optionally, the supporting mechanism includes the supporting seat and locates the leveling piece of supporting seat, the leveling piece with supporting seat threaded connection and perpendicular base downwardly extending.

Through adopting above-mentioned technical scheme, when ground local unevenness, can adjust the extension length of leveling piece and adjust supporting seat to horizontal position, ensure the steady pouring of whole tin bar forming device.

In summary, the embodiment of the present application has at least one of the following advantages:

1. the tin bars which are fully cooled are ejected out in time by utilizing the plurality of ejector rods and the transmission assembly, and the empty die cavity can continuously pour the tin liquid while waiting for the subsequent tin liquid cooling, so that the working time is saved, and the working efficiency is improved.

2. Through extension spring and pressure spring, ejector pin and drive assembly can automatic re-setting after every use, the continuous operation of user of being convenient for to improve production efficiency.

3. The inner wall of the mould is provided with a cavity for containing cooling water, and heat is carried away by the cooling water, so that molten tin in the mould cavity is rapidly cooled and formed.

4. When the ground is locally uneven, the leveling piece can be adjusted to ensure that the forming device is poured stably.

Drawings

Fig. 1 is a schematic view showing the overall structure of a rapid prototyping apparatus for producing tin bars in accordance with the first embodiment.

Fig. 2 is a front view of a rapid prototyping apparatus for producing tin bars in accordance with one embodiment.

Fig. 3 is a cross-sectional view of the A-A plane of fig. 2.

Fig. 4 is a partial cross-sectional view of a rapid prototyping apparatus for producing tin bars in accordance with the second embodiment.

Fig. 5 is an enlarged view of a portion of fig. 4 a.

Reference numerals illustrate:

1. a support mechanism; 11. a support base; 111. a base; 112. side baffles; 113. a front baffle; 114. a support frame; 12. a leveling member; 13. a shaft lever; 14. a limit rod; 2. a mold; 21. a mold cavity; 22. a cavity; 23. a water inlet pipe; 24. a water outlet pipe; 25. the first jacking rod is sleeved; 26. an upper die; 261. an upper cavity; 262. a convex ring; 263. a through hole; 264. rubber filler strips; 27. a lower die; 271. a lower cavity; 272. a groove; 28. a second jacking rod sleeve; 281. a water stop ring; 282. a rubber gasket; 3. an ejection mechanism; 31. a push rod; 32. a transmission assembly; 321. a sleeve; 322. a top plate; 323. a pressing frame; 324. a connecting rod; 325. a pedal lever; 326. a pedal; 33. a limiting ring; 34. a pressure spring; 35. and a tension spring.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-5.

Embodiment one:

the embodiment of the application discloses a quick forming device for producing tin bars. Referring to fig. 1, a rapid prototyping apparatus for producing tin bars includes a support mechanism 1, a mold 2 mounted on the support mechanism 1, and an ejection mechanism 3 for ejecting cooled tin bars.

Referring to fig. 1 and 2, the support mechanism 1 includes a support base 11 and a leveling member 12 disposed on the support base 11, wherein the support base 11 includes a rectangular frame-shaped base 111, two side baffles 112 extending from two short sides of the base 111 in a direction perpendicular to the base 111, a front baffle extending from one long side of the base 111 in a direction perpendicular to the base 111, and a support frame 114 disposed on a side of the front baffle 113 and the side baffle 112 away from the base 111, and the support frame 114 is parallel to the base 111. The leveling member 12 is disposed at four corners of the base 111, and the leveling member 12 is screwed with the base 111 and extends downward perpendicular to the base 111. Wherein the leveling member 12 is rotated, and the leveling member 12 can move up and down in the vertical direction. When the ground is locally uneven, the extending length of the leveling piece 12 can be adjusted to adjust the supporting seat 11 to the horizontal position, so that the whole tin bar forming device is ensured to be poured stably.

Referring to fig. 1 and 3, the mold 2 is mounted on a side of the supporting frame 114 facing away from the base 111, a plurality of strip-shaped mold cavities 21 are formed on a side of the mold 2 facing away from the supporting frame 114, and the mold cavities 21 extend along a short side direction of the supporting frame 114 and are uniformly distributed along a long side direction of the supporting frame 114. The inside cavity 22 that is used for holding cooling water that has seted up of mould 2, mould 2 periphery side is provided with inlet tube 23 and outlet pipe 24, and inlet tube 23 and outlet pipe 24 communicate with cavity 22 respectively. The molten tin in the cavity 21 is rapidly cooled and formed by circulating cooling water.

Referring to fig. 3, the ejection mechanism 3 includes a plurality of ejector pins 31 provided corresponding to the mold cavity 21 and a transmission assembly 32 for pushing the ejector pins 31 to move. The bottom wall of each die cavity 21 is fixedly connected with a first ejector rod sleeve 25 penetrating through the die 2 in the vertical direction, wherein the first ejector rod sleeve 25 is communicated with the die cavity 21, and one end, close to the die cavity 21, of the first ejector rod sleeve 25 is located on the same water surface with the bottom wall of the die cavity 21. The ejector rod 31 is arranged on the inner side of the ejector rod sleeve one 25 in a penetrating way and is in sliding connection with the ejector rod sleeve one 25, and one end of the ejector rod 31, which is far away from the die 2, is abutted with the transmission assembly 32. When the transmission assembly 32 is not in operation, the end of the ejector rod 31 remote from the base 111 is positioned at the same level as the bottom wall of the die cavity 21. The ejector rod 31 is pushed by the transmission assembly 32 to move along the first ejector rod sleeve 25, and the ejector rod 31 can be ejected from the bottom wall of the die cavity 21, so that the cooled tin bar can be ejected out of the die cavity 21.

Referring to fig. 3, the support mechanism 1 further includes a shaft 13 disposed between the two side baffles 112, the shaft 13 being located on a side of the side baffles 112 away from the front baffle 113 and the shaft 13 being disposed near the support frame 114. The transmission assembly 32 includes a plurality of sleeves 321 sleeved on the outer peripheral side of the shaft 13, and the sleeves 321 can rotate around the central axis of the shaft 13. A top plate 322 with the length equal to that of the sleeve 321 is fixedly connected to one side of the sleeve 321 close to the front baffle 113, and the top plate 322 is abutted to one end of the ejector rod 31 far away from the die 2. When the sleeve 321 rotates around the central axis of the shaft 13, the top plate 322 rotates along with the sleeve 321 and pushes the ejector rod 31, and under the guiding action of the first ejector rod sleeve 25, the ejector rod 31 stretches into the die cavity 21 and jacks up the cooling tin bar.

One side of sleeve 321, which is away from roof 322, is fixedly connected with pressure frame 323, one end of pressure frame 323, which is away from sleeve 321, is hinged with connecting rod 324, one end of connecting rod 324, which is away from pressure frame 323, is hinged with pedal rod 325, one end of pedal rod 325 is hinged with base 111, and one end of pedal rod 325, which is away from base 111, is connected with pedal 326. The hinge axis between the connecting rod 324 and the pressing frame 323, the hinge axis between the connecting rod 324 and the pedal lever 325, and the hinge axis between the pedal lever 325 and the base 111 are all parallel to the shaft 13. When a user depresses the pedal 326, the pedal lever 325 rotates downward about the hinge axis between the pedal lever 325 and the base 111, thereby driving the connecting rod 324 to move toward the base 111, and driving the pressing frame 323 to rotate about the shaft 13 toward the base 111. When the pressing frame 323 rotates, the pressing frame 323 drives the sleeve 321 to rotate around the central shaft of the shaft lever 13, and the top plate 322 rotates along with the sleeve 321 and pushes the ejector rod 31 to move towards the die cavity 21 due to the lever principle, so that the cooled tin bar is ejected out of the die cavity 21.

Referring to fig. 3, in order to prevent the ejector rod 31 from dropping or losing, the supporting mechanism 1 further includes a limiting rod 14 disposed between the two side baffles 112, where the limiting rod 14 is located on a side of the shaft 13 near the front baffle and on a side of the shaft 13 near the supporting frame 114. One end of the ejector rod 31, which is far away from the die 2, vertically penetrates through the limiting rod 14 and extends along the direction towards the base 111, a limiting ring 33 is arranged on the periphery of the ejector rod 31, the limiting ring 33 is located between the limiting rod 14 and the die 2, and one side, close to the limiting rod 14, of the limiting ring 33 is abutted against the limiting rod 14. The cross section area of the limiting ring 33 is larger than the cross section area of the hole of the ejector rod 31 penetrating through the limiting rod 14, and the ejector rod 31 cannot penetrate through the limiting rod 14 to separate from the limiting rod 14 and the die 2 through limiting of the limiting rod 14 to the limiting ring 33.

Referring to fig. 3, in order to automatically reset the jack 31 and the transmission assembly 32 after each use, a compression spring 34 is sleeved on the outer circumference side of the jack 31, one end of the compression spring 34 abuts against the die 2, and the other end of the compression spring 34 abuts against the limit ring 33; one side of the top plate 322, which is away from the ejector rod 31, is connected with a tension spring 35, and the other end of the tension spring 35 is connected with the base 111.

The implementation principle of the rapid prototyping device for producing tin bars in the first embodiment of the application is as follows:

firstly, the water inlet pipe 23 and the water outlet pipe 24 are connected with an external water tank and a water pump, circulating cooling water is introduced into the cavity 22, and molten tin liquid can be poured into the die cavity 21.

After the tin solution in the mold cavity 21 is sufficiently cooled to form a tin bar, a user depresses the pedal 326 to drive the pedal lever 325 to rotate around the hinge shaft between the pedal lever 325 and the base 111, the pedal lever 325 drives the connecting rod 324 to move in a direction approaching the base 111, and the connecting rod 324 drives the pressing frame 323 to rotate around the shaft 13 in a direction approaching the base 111. When one end of the pressing frame 323 connected with the connecting rod 324 moves towards the direction of the base 111, the pressing frame 323 drives the sleeve 321 to rotate around the central shaft of the shaft rod 13, the top plate 322 rotates along with the sleeve 321 and moves away from the direction of the base 111 due to the lever principle, the top plate 322 stretches the tension spring 35, the top plate 322 pushes the ejector rod 31 to move along the direction away from the base 111, the limiting piece on the ejector rod 31 and the die 2 compress the pressure spring 34, and the ejector rod 31 jacks up from the bottom wall of the die cavity 21 and ejects the cooled tin bar out of the die cavity 21.

When the cooled tin bar is removed, the user releases the pedal 326, the tension spring 35 contracts to pull the top plate 322 to the original position in the direction close to the base 111, the compression spring 34 springs off to enable the limiting piece to rebound to abut against the limiting rod 14, the ejector rod 31 is retracted to the original position from the inside of the die cavity 21 in the direction close to the base 111, and then molten tin can be continuously poured into the idle die cavity 21.

Embodiment two:

the difference between this embodiment and the first embodiment is that: the structure of the mold 2 is different.

Referring to fig. 4 and 5, the mold 2 in this embodiment includes an upper mold 26 and a lower mold 27 that are detachably connected. Wherein, an upper cavity 261 for holding cooling water is arranged on one side of the upper die 26 close to the lower die 27, a lower cavity 271 for holding cooling water is arranged on one side of the lower die 27 close to the upper die 26, and the upper cavity 261 is communicated with the lower cavity 271. The water inlet pipe 23 is provided in the mold 2 and communicates with the lower cavity 271, and the water outlet pipe 24 is provided in the upper mold 26 and communicates with the upper cavity 261.

In order to realize quick installation of the upper die 26 and the lower die 27, a convex ring 262 is connected to one side of the upper die 26 facing the lower die 27, a groove 272 corresponding to the convex ring 262 is formed on one side of the lower die 27 facing the upper die 26, and the convex ring 262 of the upper die 26 and the groove 272 of the lower die 27 are mutually inserted, so that installation of the die 2 is completed. Wherein, mould 2 divide into upper mould 26 and bed die 27, and upper mould 26 and bed die 27 detachable connection have the effect that conveniently washs the inside upper cavity 261 of mould 2 and bed die 271.

Referring to fig. 4 and 5, a plurality of mold cavities 21 are formed in a side of the upper mold 26 facing away from the lower mold 27, the mold cavities 21 extend along a short side direction of the supporting frame 114 and are uniformly distributed along a long side direction of the supporting frame 114, and through holes 263 penetrating through the upper mold 26 are formed in each mold cavity 21. The lower die 27 is connected with a second ejector rod sleeve 28 penetrating through the lower die 27 and extending in the vertical direction, the central axis of the second ejector rod sleeve 28 coincides with the central axis of the through hole 263, the second ejector rod sleeve 28 penetrates through the through hole 263 to be communicated with the die cavity 21, and one end, close to the die cavity 21, of the second ejector rod sleeve 28 is located on the same horizontal plane with the bottom wall of the die cavity 21. The ejector rod 31 is arranged in the ejector rod sleeve II 28 in a penetrating way, and when the transmission assembly 32 does not work, one end of the ejector rod 31 away from the base 111 and the bottom wall of the die cavity 21 are positioned on the same horizontal plane. Wherein, the outer diameter of the ejector rod 31 is equal to the inner diameter of the ejector rod sleeve II 28, and the outer diameter of the ejector rod sleeve II 28 is equal to the diameter of the through hole 263.

In order to prevent the leakage of cooling water from the junction of the upper mold 26 and the lower mold 27, a rubber gasket 264 is connected along the edge of the convex ring 262, and when the upper mold 26 and the lower mold 27 are fitted to each other, the convex ring 262 and the groove 272 press the rubber gasket 264 against each other, preventing the leakage of cooling water from the gap between the upper mold 26 and the lower mold 27. Further, a water stop ring 281 and a rubber gasket 282 are connected to the outer peripheral side of the end of the second jack rod sleeve 28 remote from the lower die 27. When the upper die 26 and the lower die 27 are assembled, the second ejector sleeve 28 passes through the through hole 263, the water stop ring 281 and the rubber gasket 282 fully abut against the surface of one side of the upper die 26, which is close to the lower die 27, so that cooling water is prevented from seeping out from a gap between the second ejector sleeve 28 and the through hole 263.

The implementation principle of the rapid prototyping device for producing tin bars in the second embodiment of the application is as follows:

the mold 2 in the second embodiment is a detachable structure including an upper mold 26 and a lower mold 27. When the die 2 is assembled, the convex ring 262 is inserted into the groove 272, at this time, the rubber gasket strip 264 is fully extruded between the convex ring 262 and the groove 272, the upper cavity 261 and the lower cavity 271 are mutually communicated, the second ejector rod sleeve 28 passes through the sleeve through hole 263, the water stop ring 281 and the rubber gasket 282 are fully abutted with the upper die 26, and thus the die 2 is assembled. Because the die 2 can be disassembled into the upper die 26 and the lower die 27, the upper cavity 261 and the lower cavity 271 of the die 2 can be cleaned in time, scale remained in the upper cavity 261 and the lower cavity 271 is removed, the heat conduction effect of the die 2 is improved, tin bar cooling and forming are accelerated, and the production efficiency is improved.

The present embodiment is merely illustrative of the present application and is not limiting of the present application, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as necessary, but are protected by patent laws within the scope of the claims of the present application.

Claims (7)

1. A quick forming device for producing tin bars is characterized in that: including supporting mechanism (1), install in mould (2) on supporting mechanism (1) and be used for ejecting ejection mechanism (3) of cooling tin bar, mould (2) deviate from one side of supporting mechanism (1) has seted up a plurality of bar die cavity (21), ejection mechanism (3) are including corresponding a plurality of that die cavity (21) set up vertically run through ejector pin (31) and a plurality of install in drive assembly (32) on supporting mechanism (1) of mould (2), drive assembly (32) are used for promoting ejector pin (31) are ejecting cooling tin bar die cavity (21).

2. A rapid prototyping apparatus for the production of tin bars as claimed in claim 1 wherein: supporting mechanism (1) is including locating axostylus axostyle (13) on supporting mechanism (1), axostylus axostyle (13) are followed the direction that ejector pin (31) distributes extends, drive assembly (32) are including the cover locating a plurality of sleeve (321) of the periphery side of axostylus axostyle (13), sleeve (321) are close to one side fixed connection roof (322) of ejector pin (31), roof (322) with one end butt of die cavity (21) is kept away from to ejector pin (31), sleeve (321) deviate from one side fixedly connected with pressure frame (323) of roof (322).

3. A rapid prototyping apparatus for the production of tin bars as claimed in claim 2 wherein: one side of the top plate (322) deviating from the ejector rod (31) is connected with a tension spring (35), and one end of the tension spring (35) far away from the top plate (322) is hinged with the supporting mechanism (1).

4. A rapid prototyping apparatus for the production of tin bars as claimed in claim 2 wherein: one end of the pressing frame (323) far away from the sleeve (321) is hinged with a connecting rod (324), one side of the connecting rod (324) far away from the pressing frame (323) is hinged with a pedal rod (325), one end of the pedal rod (325) is hinged with the supporting mechanism (1), and one end of the pedal rod (325) far away from the supporting mechanism (1) is connected with a pedal plate (326).

5. A rapid prototyping apparatus for the production of tin bars as claimed in claim 1 wherein: the supporting mechanism (1) comprises a limiting rod (14) arranged on the supporting mechanism (1), one end of a push rod (31) away from the die (2) vertically penetrates through the limiting rod (14) and is abutted against the transmission assembly (32), a limiting ring (33) is connected to the outer periphery side of the push rod (31), the cross section area of the limiting ring (33) is larger than that of a hole, penetrating through the limiting rod (14), of the push rod (31), and the limiting ring (33) is located between the die (2) and the limiting rod (14) and is abutted against the limiting rod (14).

6. A rapid prototyping apparatus for the production of tin bars as claimed in claim 5 wherein: the outer periphery side of ejector rod (31) is overlapped and is equipped with pressure spring (34), pressure spring (34) one end with mould (2) butt, pressure spring (34) keep away from the one end of mould (2) with spacing ring (33) butt.

7. A rapid prototyping apparatus for the production of tin bars as claimed in claim 1 wherein: the inside of mould (2) has offered cavity (22) that are used for holding cooling water, the periphery side of mould (2) be provided with inlet tube (23) and outlet pipe (24) of cavity (22) intercommunication.