CN213080009U - Fixed dummy ingot connecting piece pin for continuous casting of small square billets - Google Patents

Abstract

The utility model relates to a fixed dummy ingot connecting piece pin of little square billet continuous casting usefulness, including first connecting pin and second connecting pin, the inside at first connecting pin is established to the second connecting pin cover, just the intensity of second connecting pin is greater than the intensity of first connecting pin. When the head of the casting blank is pulled, the pin has enough strength, and the situation that the casting blank is broken and separated in advance due to overlarge pulling resistance is prevented; when the dummy bar head is separated from the connecting piece, the pin can separate the dummy bar head from the casting blank in time, and the phenomena of casting stop and blank stagnation in the prior art are avoided.

Description

Fixed dummy ingot connecting piece pin for continuous casting of small square billets

Technical Field

The utility model relates to a technical field of metallurgical field continuous casting dummy ingot jointing equipment, more specifically say, it relates to a fixed dummy ingot connecting piece pin of little square billet continuous casting usefulness.

Background

In the metallurgical continuous casting pouring process, a casting blank head needs to be pulled to a withdrawal and straightening machine by a dummy bar, the dummy bar head and a connecting piece need to be locked and fixed by a pin in the process, and when the casting blank head reaches a dummy bar recovery position, the locking pin needs to be broken under the action of external force such as a knockout roll and the like to force the dummy bar head to be separated from the connecting piece. This requires locking the dummy bar head and the connector pin, with two properties: when the head of a casting blank is pulled, the pin needs to have enough strength to prevent the casting blank from breaking and separating in advance due to overlarge pulling resistance; when the dummy bar head is separated from the connecting piece, the pin needs to have the strength smaller than the external force, so that the dummy bar head can be separated from the casting blank in time.

At present, the head of a dummy bar of a small square billet and a locking pin of a connecting piece are mainly made of wood, and are influenced by the abrasion of a dummy guide roller, the deformation of the dummy bar and the like, the casting starting and blank drawing resistance can be increased, so that the wood pin is broken by the blank drawing resistance before reaching a dummy recovery position, the dummy head is separated from the connecting piece of a casting blank in advance, and the pouring is forced to be stopped. In the prior art, metal pins are used for replacing wooden pins, although the strength of the metal pins is enough, when the dummy ingot reaches a dummy ingot recovery position, a dummy ingot head needs to be separated from a casting blank connecting piece, and due to the fact that the strength of the metal pins is too high, the metal pins cannot be broken by downward acting force of a decoiling roller, and the phenomenon of stopping pouring and delaying billets can also be caused.

SUMMERY OF THE UTILITY MODEL

To the deficiencies of the prior art, an object of the utility model is to provide a fixed dummy bar connecting piece pin of little square billet continuous casting usefulness. When the head of the casting blank is pulled, the pin has enough strength, and the situation that the casting blank is broken and separated in advance due to overlarge pulling resistance is prevented; when the dummy bar head is separated from the connecting piece, the pin can separate the dummy bar head from the casting blank in time, and the phenomena of casting stop and blank stagnation in the prior art are avoided.

The above technical purpose of the present invention can be achieved by the following technical solutions: the utility model provides a fixed dummy ingot connecting piece pin of little square billet continuous casting usefulness, includes first connecting pin and second connecting pin, the inside at first connecting pin is established to the second connecting pin cover, just the intensity of second connecting pin is greater than the intensity of first connecting pin.

Further, the first connecting pin is a wood pin, and the second connecting pin is a round carbon steel rod.

Further, the second connecting pin comprises the following main components in percentage by weight: carbon: 0.22-0.24 part; silicon: 0.30-0.47 parts; manganese: 1.30-1.48 parts; phosphorus: less than or equal to 0.045 portion; sulfur: less than or equal to 0.043 portion.

Furthermore, the outer diameter of the first connecting pin is 23-24mm, the length of the first connecting pin is 150-160mm, the middle part of the first connecting pin is provided with a hole, and the diameter of the hole is 5-7 mm.

Further, the outer diameter of the second connecting pin coincides with the diameter of the hole, and the length of the second connecting pin coincides with the length of the first connecting pin.

Further, the outer diameter of the first connecting pin is gradually reduced from the head portion to the tail portion.

Further, the first connecting pin is stepped shaft-shaped in appearance and includes at least one shoulder.

Furthermore, the continuous casting billet and the dummy bar head are matched up and down to wrap the connecting piece, the dummy bar head is transversely provided with a fixing hole, the fixing hole is positioned in the middle of the connecting piece, and the first connecting pin and the second connecting pin are inserted into the fixing hole.

To sum up, the utility model discloses following beneficial effect has:

1. when the head of the casting blank is pulled, the pin has enough strength, and the situation that the casting blank is broken and separated in advance due to overlarge pulling resistance is prevented; when the dummy bar head is separated from the connecting piece, the pin can separate the dummy bar head from the casting blank in time, and the phenomena of casting stop and blank stagnation in the prior art are avoided.

2. The utility model discloses simple manufacture, safe and reliable can guarantee the intensity of fixing pin, also can not cause the phenomenon of unable separation because of material intensity is too big, reduction production accident risk. The second connecting pin is used as a main function, the strength and the hardness of the whole connecting pin are enhanced, and when the connecting pin is used in combination, the first connecting pin is not easy to break due to stress when the head of the casting blank is pulled. But because the actual size of the second connecting pin is smaller, compared with a fixing pin which entirely uses metal, the structure has smaller strength and hardness. When the connecting pin is broken by pressure under the action of external force such as a knockout roll and the like, the first connecting pin is fragile due to being woody and is easy to crack and break, and then pressure continues to act on the second connecting pin with smaller size, so that the first connecting pin and the second connecting pin are also convenient to separate.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;

fig. 2 is a usage state diagram of embodiment 1 of the present invention;

fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.

In the figure: 1-a first connecting pin, 2-a second connecting pin, 3-a fixing hole, 4-a dummy bar head, 5-a continuous casting billet and 6-a connecting piece.

Detailed Description

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

It should be noted that all the directional terms such as "upper" and "lower" referred to herein are used with respect to the view of the drawings, and are only for convenience of description, and should not be construed as limiting the technical solution.

Example 1

As shown in fig. 1 and 2, a fixed dummy bar connecting piece pin for continuous casting of billets comprises a first connecting pin 1 and a second connecting pin 2, wherein the second connecting pin 2 is sleeved inside the first connecting pin 1, and the strength of the second connecting pin 2 is greater than that of the first connecting pin 1. This structure simple manufacture, safe and reliable can guarantee the intensity of fixing pin, also can not cause the phenomenon of unable separation because of material intensity is too big, reduces the production accident risk. The first connecting pin 1 is a wood pin, and the second connecting pin 2 is a round carbon steel rod. The utility model discloses because the intensity of first connecting pin 1 and second connecting pin 2 is different, under its common action on the circumstances of dummy bar connecting piece, when pulling the casting blank head, the pin has enough intensity, and the higher preparation material intensity of second connecting pin 2 makes when whole fixing pin receives inhomogeneous pulling force, is difficult to be broken by the drawing, even under special circumstances, first connecting pin 1 atress is great has some little fracture, also can keep connecting under the effect of second connecting pin 2, prevent to draw the base resistance too big and fracture the separation in advance; when the dummy bar head is separated from the connecting piece, the pin is pressed down by an external force such as a knockout roll, the first connecting pin 1 is easy to break due to low strength, and the second connecting pin 2 is arranged in the first connecting pin 1, namely the second connecting pin 2 is small in size and thin in diameter, so that the second connecting pin is easy to break under stable pressure, the dummy bar head can be separated from a casting blank in time, and the phenomena of casting stop and blank stagnation in the prior art are avoided.

In this embodiment, the second connecting pin 2 serves as a main connecting anti-fracture function, and the selected round carbon steel rod comprises the following main components in percentage by weight: carbon: 0.22-0.24 part; silicon: 0.30-0.47 parts; manganese: 1.30-1.48 parts; phosphorus: less than or equal to 0.045 portion; sulfur: the proportion of the material structure is less than or equal to 0.043 part, and the rest is mainly iron, so that the requirements of sufficient strength and hardness can be met, and the performances of the material are realized. Due to the fact that the second connecting pin 2 is thin in relative size, the use ratio of the components can be obtained through a plurality of test results in combination with practical application, and pins for connecting and fixing existing in the prior art are not selected. The second connecting pin 2 formed according to the proportion can provide enough tensile stress for the first connecting pin 1, so that the overall strength and hardness of the first connecting pin are enhanced, but the second connecting pin can be easily broken under the action of stable external force, and separation is realized.

In this embodiment, since the continuous casting slab 5 and the dummy bar head 4 are vertically fitted to each other to wrap the connecting member 6 to be formed, the device should be inserted into the fixing hole 3, and the fixing hole 3 is transversely opened on the dummy bar head 4 and is located in the middle of the connecting member 6. Taking the copper tube of the billet crystallizer as an example of 170mm multiplied by 170mm, the outer diameter of the first connecting pin 1 is 24mm, and the length thereof is 160 mm. Because first connecting pin 1 need insert in fixed orifices 3, the whole size that continuous casting billet 5 and dummy bar head 4 formed should with little square billet crystallizer copper pipe adaptation, and fixed orifices 3 length also is 170mm promptly, then the total length of first connecting pin 1 needs slightly to be less than fixed orifices 3 to conveniently insert back fixed connection, be difficult for breaking off with the fingers and thumb or protrusion fixed orifices 3 and influence the leading process of putting into little square billet crystallizer copper pipe etc.. The first connecting pin 1 is provided with a hole in the middle, and the diameter of the hole is 7mm, and the hole is used for inserting the second connecting pin 2. And the outer diameter of the second connecting pin 2 corresponds to the diameter of the hole, and the length of the second connecting pin 2 corresponds to the length of the first connecting pin 1. The second connecting pin 2 completely fills the central opening of the first connecting pin 1, so that the second connecting pin 2 can increase the practical use strength and hardness of the first connecting pin 1 at each position as a whole when the connecting pin is applied. If there is a gap, the second connecting pin 2 cannot provide the first connecting pin 1 with a supporting force at the gap when receiving an uneven external force, so that the first connecting pin 1 is broken first, which affects the practical use effect. The outer diameter of the first connecting pin 1 is gradually reduced from the head part to the tail part, and the change of the outer diameter is relatively small, namely the head part of the first connecting pin 1 has the maximum diameter of 24mm, and the tail part has the minimum diameter of 23.8 mm; or may be designed such that only a small portion of the tail portion is reduced in diameter as shown. This is for the convenience of the first connecting pin 1 interfacing with the fixing hole 3 so that the device can be more easily inserted into the fixing hole 3.

Example 2

In this embodiment, unlike embodiment 1, the first connecting pin 1 is designed to have a stepped shaft shape as a whole, and the shape thereof is optimized, and the wooden first connecting pin 1 is likely to expand by water and not easily knocked out at the time of mold release because water cooling or the like may be required during use without changing the original strength. In the optimized mode shown in fig. 3, after the fracture, the part with smaller outer diameter is broken without fail and easily falls out of the fixing hole 3, and even if the other part is not easy to knock out due to the expansion of the wooden pin by pouring water, when the use is needed, the new first connecting pin 1 and the second connecting pin 2 are driven again, and the rest of the fractured pins can be withdrawn.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (7)

1. The utility model provides a fixed dummy ingot connecting piece pin of little square billet continuous casting usefulness which characterized in that, includes first connecting pin (1) and second connecting pin (2), the inside at first connecting pin (1) is established in second connecting pin (2) cover, just the intensity of second connecting pin (2) is greater than the intensity of first connecting pin (1).

2. The pin of claim 1, wherein said first connecting pin (1) is a wood pin and said second connecting pin (2) is a round carbon steel rod.

3. The pin of a fixed dummy bar coupler for continuous billet casting according to claim 1, wherein the outer diameter of the first coupling pin (1) is 23-24mm, the length thereof is 150-160mm, the middle portion of the first coupling pin (1) is provided with a hole, and the diameter of the hole is 5-7 mm.

4. A fixed dummy bar coupler pin for billet casting according to claim 3, wherein the outer diameter of the second coupler pin (2) corresponds to the diameter of the hole, and the length of the second coupler pin (2) corresponds to the length of the first coupler pin (1).

5. A fixed dummy bar coupler pin for billet casting according to any one of claims 1 to 4, wherein the outer diameter of said first coupler pin (1) is gradually reduced from the head portion to the tail portion.

6. A fixed dummy bar coupler pin for continuous billet casting according to any one of claims 1 to 4, wherein said first coupler pin (1) has a stepped shaft shape and comprises at least one shoulder.

7. The pin of the fixed dummy bar connecting piece for continuous casting of billets as claimed in claim 1, wherein the continuous casting slab (5) and the dummy bar head (4) are vertically fitted to wrap the connecting piece (6), the dummy bar head (4) is transversely provided with the fixing hole (3), the fixing hole (3) is positioned in the middle of the connecting piece (6), and the first connecting pin (1) and the second connecting pin (2) are inserted into the fixing hole (3).

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