A lead bismuth alloy thermal compensation device

Abstract

The utility model relates to liquid metal casting technical field, concretely relates to a lead bismuth alloy thermal compensation device, including the mounting frame, the mounting frame is arranged with a plurality of heating rods in rectangular array, the mounting frame still is longitudinally arranged with a plurality of thermocouples for temperature measurement, the bottom edge of mounting frame is arranged with a plurality of support assemblies, and the support assembly includes support casing and support plate body, the support casing is arranged vertically in the bottom of mounting frame, and the upper end of support plate body is inserted in the inside of support casing, the length of support plate body that stretches into support casing is adjustable, the lower end of support plate body is provided with guide slot and the clamping groove that is linked with guide slot. The utility model heats to mould, realizes the thermal compensation of lead bismuth alloy in mould, delays the liquid contraction and solidification contraction of lead bismuth alloy, makes the volume contraction of lead bismuth alloy in solidification process get timely shrinkage, thereby avoids the cold shrinkage pit in the inside of lead bismuth alloy produced by casting manufacture.

Description

Technical Field

[0001] This utility model relates to the field of liquid metal casting technology, specifically to a lead-bismuth alloy thermal compensation device. Background Technology

[0002] Lead-bismuth alloys are alloys composed primarily of lead and bismuth. They possess characteristics such as low melting point and stable solidification volume, making them suitable for casting complex-shaped parts and mold making. Currently, when manufacturing lead-bismuth alloys through furnace casting, the molten lead-bismuth alloy is typically poured into a specific mold. However, due to the low melting point and wide crystallization temperature range of lead-bismuth alloys, the liquid shrinkage and solidification shrinkage of the molten lead-bismuth alloy are significant. During solidification, the volume loss caused by shrinkage cannot be promptly replenished by the liquid lead-bismuth alloy, leading to the formation of cold shrinkage pits inside the cast lead-bismuth alloy. Summary of the Invention

[0003] This invention addresses the problem of cold shrinkage pits easily forming inside lead-bismuth alloys during casting, by providing a lead-bismuth alloy thermal compensation device. This device heats the mold to compensate for the cold shrinkage of the lead-bismuth alloy inside the mold, delaying the liquid shrinkage and solidification shrinkage of the lead-bismuth alloy. This ensures that the volume shrinkage of the lead-bismuth alloy during solidification is compensated in time, thereby avoiding the formation of cold shrinkage pits inside the lead-bismuth alloy caused by casting.

[0004] To achieve the above objectives, the technical solution of this utility model is: a lead-bismuth alloy thermal compensation device, comprising a mounting frame, on which a plurality of heating rods are arranged in a rectangular array, the upper ends of the heating rods being detachably connected to the mounting frame and the lower ends extending below the mounting frame; the mounting frame is also longitudinally arranged with a plurality of thermocouples for temperature measurement, the upper ends of the thermocouples being detachably connected to the mounting frame and the lower ends extending below the mounting frame. The mounting frame provides mounting positions for the heating rods and thermocouples while ensuring that the heating rods are at the same horizontal position. By inserting the heating rods into the gaps between molds to heat the molds, thermal compensation of the lead-bismuth alloy within the molds is achieved.

[0005] Several support components are arranged at the bottom edge of the mounting frame. Each support component includes a support housing and a support plate that matches the support housing. The support housing is vertically positioned at the bottom of the mounting frame, and the upper end of the support plate is inserted into the support housing. The length of the support plate extending into the support housing is adjustable. The lower end of the support plate has a guide groove and a slot communicating with the guide groove. The support components support and mount the mounting frame, allowing it to be mounted above the mold, so that the heating rod and thermocouple extend into the gap between the molds. The length of the heating rod and thermocouple extending into the gap between the molds can be adjusted by adjusting the length of the support plate extending into the support housing.

[0006] Furthermore, the top of the mounting frame is symmetrically provided with handles, which are in the shape of an inverted "U". The design of the handles facilitates the handling or hoisting of the thermal compensation device.

[0007] Furthermore, a nut is provided at the upper end of the heating rod, and the upper end of the heating rod is detachably connected to the mounting frame via the nut; the mounting frame has several through holes arranged in a rectangular array, and the lower end of the heating rod extends through the through holes to the bottom of the mounting frame. The through holes allow the lower end of the heating rod to pass through the mounting frame, ensuring that the heating rod can extend into the gap between the molds.

[0008] Furthermore, the mounting frame is also provided with several temperature measuring holes longitudinally, and the lower end of the thermocouple extends through the temperature measuring holes to the bottom of the mounting frame. The temperature measuring holes facilitate the passage of the thermocouple's measuring end through the mounting frame to detect the temperature within the gap between the molds.

[0009] Furthermore, the supporting shell is a hollow shell structure with an open bottom. Several adjustment holes are spaced apart on the supporting shell, and a fixing hole is provided at the upper end of the supporting plate. Locking bolts passing through the adjustment holes and fixing holes are provided on the supporting shell. By cooperating with the adjustment holes and locking bolts, the length of the supporting plate extending into the supporting shell can be adjusted, thereby adjusting the length of the heating rod and thermocouple extending into the gap between the molds.

[0010] Furthermore, the guide groove has an "eight" shaped structure, with the large end of the guide groove facing down and the small end facing up. The guide groove facilitates the support plate to be clamped onto the edge of the mold through the slot.

[0011] The beneficial effects of this utility model through the above technical solution are as follows: This utility model has a reasonable structure and good performance. It adopts the method of heating the mold to achieve thermal compensation of the lead-bismuth alloy inside the mold, thereby delaying the liquid shrinkage and solidification shrinkage of the lead-bismuth alloy. This allows the volume shrinkage of the lead-bismuth alloy during the solidification process to be compensated in time, thus avoiding the phenomenon of cold shrinkage pits inside the cast lead-bismuth alloy.

[0012] The support assembly of this invention supports the mounting frame. Its support plate, through a slot, can be secured to the edge of the mold, allowing the mounting frame to be installed above the mold. This enables the heating rod and thermocouple to extend into the gap between the molds, heating the mold and thus achieving thermal compensation for the lead-bismuth alloy inside the mold, preventing shrinkage pits from forming inside the cast lead-bismuth alloy. Thermocouples are used to monitor the temperature within the gap between the molds, allowing for adjustment of the heating rod's temperature within the mold.

[0013] This invention, through the cooperation of locking bolts with adjusting holes and fixing holes, allows for adjustment of the length of the support plate extending into the support housing, thereby adjusting the length of the heating rod and thermocouple extending into the gap between the molds. The height of the heating rod can be adjusted according to actual conditions, enabling the heating rod to heat different height positions of the mold, thus improving the thermal compensation effect of the lead-bismuth alloy inside the mold. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a lead-bismuth alloy thermal compensation device according to this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a lead-bismuth alloy thermal compensation device according to this utility model. Figure 2 ; Figure 3 This is a schematic diagram of the structure of a lead-bismuth alloy thermal compensation device according to this utility model. Figure 3 ; Figure 4 This is a schematic diagram of the structure of a lead-bismuth alloy thermal compensation device according to this utility model. Figure 4 .

[0015] The numbers in the attached diagram are as follows: 1 is the mounting frame, 2 is the handle, 3 is the heating rod, 4 is the thermocouple, 5 is the support housing, 6 is the adjustment hole, 7 is the support plate, 8 is the locking bolt, 9 is the slot, and 10 is the guide groove. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figures 1-4As shown, a lead-bismuth alloy thermal compensation device includes a mounting frame 1. Several heating rods 3 are arranged in a rectangular array on the mounting frame 1. The upper end of each heating rod 3 is detachably connected to the mounting frame 1, and the lower end extends to the bottom of the mounting frame 1. Several thermocouples 4 for temperature measurement are also arranged longitudinally on the mounting frame 1. The upper end of each thermocouple 4 is detachably connected to the mounting frame 1, and the lower end extends to the bottom of the mounting frame 1. In this embodiment, sixteen heating rods 3 are installed on the mounting frame 1, and four thermocouples 4 are installed longitudinally at equal intervals on the mounting frame 1. The mounting frame 1 provides installation positions for the heating rods 3 and thermocouples 4. At the same time, the mounting frame 1 can also make several heating rods 3 in the same horizontal position. The heating rods 3 are inserted into the gap between the molds to heat the molds. After the molds are heated, thermal compensation is achieved for the lead-bismuth alloy inside the molds, delaying the liquid shrinkage and solidification shrinkage of the lead-bismuth alloy. This allows the volume shrinkage of the lead-bismuth alloy during the solidification process to be compensated in time, thereby avoiding the phenomenon of cold shrinkage pits inside the lead-bismuth alloy. The thermocouples 4 detect the temperature in the gap between the molds and convert the temperature into an electrical signal and transmit it to the temperature controller. The temperature controller controls the heating temperature and start / stop of the heating rods 3. The working principle between the temperature controller, the heating rods 3 and the thermocouples 4 is the prior art and will not be described in detail here.

[0017] Several support components are arranged at the bottom edge of the mounting frame 1. Each support component includes a support housing 5 and a support plate 7 that matches the support housing 5. The support housing 5 is vertically positioned at the bottom of the mounting frame 1. The upper end of the support plate 7 is inserted into the support housing 5, and the length of the support plate 7 extending into the support housing 5 is adjustable. The lower end of the support plate 7 has a guide groove 10 and a slot 9 communicating with the guide groove 10. In this embodiment, two parallel support components are installed at intervals around the bottom of the mounting frame 1. The support components support and install the mounting frame 1. The slot 9 at the lower end of the support plate 7 allows the support plate 7 to be engaged at the edge of the mold, installing the mounting frame 1 above the mold. This allows the heating rod 3 and thermocouple 4 to extend into the gap between the molds, enabling the heating rod 3 to heat the mold and thus achieving thermal compensation for the lead-bismuth alloy inside the mold.

[0018] The top of the mounting frame 1 is symmetrically provided with handles 2, which are in the shape of an inverted "U". In this embodiment, there are two handles 2. The lower end of the vertical part of the handle 2 is welded and fixed to the top of the mounting frame 1. The handles 2 are used to move or lift the heat compensation device above the mold.

[0019] The upper end of the heating rod 3 is provided with a nut, and the upper end of the heating rod 3 is detachably connected to the mounting frame 1 through the nut. The mounting frame 1 has several through holes arranged in a rectangular array, and the lower end of the heating rod 3 extends through the through holes to the bottom of the mounting frame 1. In this embodiment, the heating rod 3 is fixed by two nuts located at the top and bottom of the mounting frame 1, respectively. A washer fitted between the nut and the mounting frame 1 is fitted onto the heating rod 3. The nut and the upper end of the heating rod 3 are detachably connected by threads. The through hole design allows the lower end of the heating rod 3 to extend through the mounting frame 1 to the bottom, ensuring that the lower end of the heating rod 3 can extend into the gap between the molds to heat the molds.

[0020] The mounting frame 1 is also provided with several temperature measuring holes longitudinally, and the lower end of the thermocouple 4 extends through the temperature measuring holes to the bottom of the mounting frame 1. In this embodiment, the design structure of the temperature measuring holes allows the lower end of the thermocouple 4 to extend through the mounting frame 1 to its bottom, ensuring that the lower end of the thermocouple 4 can be inserted into the gap between the molds to detect the temperature in the gap between the molds.

[0021] The supporting shell 5 is a hollow shell structure with an open bottom. Several adjustment holes 6 are spaced apart on the supporting shell 5. A fixing hole is provided at the upper end of the supporting plate 7. Locking bolts 8 are provided on the supporting shell 5, passing through the adjustment holes 6 and the fixing holes. In this embodiment, the upper end of the supporting plate 7 has two fixing holes, and the supporting shell 5 has two sets of adjustment holes 6 spaced apart. Each set includes four adjustment holes 6 evenly spaced vertically on the supporting shell 5. The locking bolts 8 are passed through the fixing holes and the corresponding adjustment holes 6, and cooperate with the nuts to fix the supporting shell 5 and the supporting plate 7. The length of the supporting plate 7 extending into the supporting shell 5 can be adjusted through the adjustment holes 6, thereby adjusting the length of the heating rod 3 and the thermocouple 4 extending into the gap between the molds.

[0022] The guide groove 10 has an "eight" shape, with the larger end facing down and the smaller end facing up. In this embodiment, the guide groove 10 facilitates the mounting of the support plate 7 onto the edge of the mold.

[0023] When using this invention, if thermal compensation is required for the lead-bismuth alloy inside the mold, firstly, adjust the length of the support plate 7 extending into the support housing 5 according to the required length of the heating rod 3 extending into the gap between the molds. Specifically, remove the locking bolt 8, move the support plate 7 downwards or upwards, and when the length of the support plate 7 extending into the support housing 5 reaches the required length, then pass the locking bolt 8 through the fixing hole and the corresponding adjustment hole 6, and fix the support housing 5 and the support plate 7 with nuts. After each support component is adjusted, use the handle 2 to move or hoist the thermal compensation device to the top of the mold, so that the heating rod 3 and the thermocouple 4 correspond to the gap between the molds. Then, place the thermal compensation device downwards, and use the guide groove 10 and the slot 9 to clamp the support plate 7 onto the edge of the mold. At this time, the heating rod 3 and the thermocouple 4 extend into the gap between the molds. The heating rod 3 is activated to heat the mold. The thermocouple 4 detects the temperature in the gap between the molds. After the mold is heated, thermal compensation is achieved for the lead-bismuth alloy inside the mold, which delays the liquid shrinkage and solidification shrinkage of the lead-bismuth alloy. This allows the volume shrinkage of the lead-bismuth alloy during solidification to be compensated in time, thereby avoiding the phenomenon of cold shrinkage pits inside the lead-bismuth alloy.

[0024] The embodiments described above are merely preferred embodiments of the utility model and are not intended to limit the scope of the utility model. Therefore, all equivalent changes or modifications made to the technical solutions described in the scope of the utility model patent application should be included within the scope of the utility model patent application.

Claims

1. A lead-bismuth alloy thermal compensation device, characterized in that, The system includes a mounting frame (1), on which a plurality of heating rods (3) are arranged in a rectangular array. The upper end of each heating rod (3) is detachably connected to the mounting frame (1), and the lower end extends to the bottom of the mounting frame (1). The mounting frame (1) is also provided with a plurality of thermocouples (4) for temperature measurement arranged longitudinally. The upper end of each thermocouple (4) is detachably connected to the mounting frame (1), and the lower end extends to the bottom of the mounting frame (1). Several support components are arranged at the bottom edge of the mounting frame (1). The support components include a support housing (5) and a support plate (7) that matches the support housing (5). The support housing (5) is vertically arranged at the bottom of the mounting frame (1). The upper end of the support plate (7) is inserted into the inside of the support housing (5). The length of the support plate (7) extending into the support housing (5) is adjustable. The lower end of the support plate (7) is provided with a guide groove (10) and a slot (9) that communicates with the guide groove (10).

2. The lead-bismuth alloy thermal compensation device according to claim 1, characterized in that, The top of the mounting frame (1) is symmetrically provided with handles (2), which are in the shape of an inverted "U".

3. The lead-bismuth alloy thermal compensation device according to claim 1, characterized in that, The upper end of the heating rod (3) is provided with a nut, and the upper end of the heating rod (3) is detachably connected to the mounting frame (1) through the nut; the mounting frame (1) has several through holes in a rectangular array, and the lower end of the heating rod (3) extends through the through holes to the bottom of the mounting frame (1).

4. The lead-bismuth alloy thermal compensation device according to claim 1, characterized in that, The mounting frame (1) is also provided with several temperature measuring holes in the longitudinal direction, and the lower end of the thermocouple (4) extends through the temperature measuring holes to the bottom of the mounting frame (1).

5. A lead-bismuth alloy thermal compensation device according to claim 1, characterized in that, The supporting shell (5) is a shell-shaped structure with a hollow interior and an open bottom. Several adjustment holes (6) are arranged at intervals on the supporting shell (5). A fixing hole is opened at the upper end of the supporting plate (7). Locking bolts (8) that pass through the adjustment holes (6) and the fixing holes are provided on the supporting shell (5).

6. The lead-bismuth alloy thermal compensation device according to claim 1, characterized in that, The guide groove (10) has an "eight" shaped structure, with the large end of the guide groove (10) facing down and the small end facing up.

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