A intermittent vacuum distillation furnace with a crucible transfer and pouring device

Abstract

The application relates to the technical field of crucible lifting devices, in particular to a kind of intermittent vacuum distillation furnace with crucible transfer and pouring device, including lifting ring head, lower end fixedly connected with top connecting rod;A pair of lifting arms;Hoop;Fixed part, it is symmetrically arranged on the outer side end face of the hoop, the bottom end of the lifting arm is respectively hinged on the hoop through the fixed part;Among them, the crucible suitable for the intermittent vacuum distillation furnace with crucible transfer and pouring device is annularly provided with groove part on the outer side wall, and the ratio of the distance L from the center line of the groove part to the top opening of the crucible to the total height H of the crucible is 1 / 3-1 / 2;The depth of the groove part is greater than or equal to the thickness of the clamping ring body of the hoop;The bottom surface of the groove part is used for abutting with the inner side surface of the clamping ring body.The utility model forms mechanical interlocking by external holding mode, uses the groove part on the crucible and the hoop, avoids the grabbing mode depending on friction force, thereby significantly improve the safety and reliability of lifting.

Description

Technical Field

[0001] This utility model relates to the field of crucible lifting equipment technology, specifically a crucible transfer and unloading device for an intermittent vacuum distillation furnace. Background Technology

[0002] In the process of periodic (intermittent) vacuum reduction furnaces, it is usually necessary to transfer and unload the molten material in the crucible. Crucible hoisting is a critical step in this transfer and unloading process.

[0003] However, due to the limitations of the furnace's internal space, the gap between the crucible and the furnace wall is usually small. Therefore, the traditional method of using an external bottom-supporting hoist, which involves extending the hoist to the bottom of the crucible to support it, is not suitable.

[0004] To address this challenge, existing technologies commonly employ internal gripping lifting devices. These devices use gripping arms or flexible strips (such as copper strips) that extend into the crucible and are tensioned outwards, relying on friction to lift the crucible. However, the inner walls of crucibles used in vacuum furnaces are extremely smooth, resulting in a low coefficient of friction between the gripping surfaces. To achieve reliable gripping, extremely high radial stress must be applied to the gripping components. This puts the copper strip, as the gripping element, under high stress for extended periods, making it highly susceptible to fatigue damage and plastic deformation, thus significantly shortening its service life. More seriously, if the copper strip suddenly breaks during lifting due to stress concentration or potential damage, it will directly cause the crucible to fall. Such accidents not only damage expensive furnace materials and precision equipment but also pose a serious threat to the safety of on-site operators, creating significant safety hazards. Utility Model Content

[0005] The purpose of this utility model is to provide a crucible transfer and unloading device for an intermittent vacuum distillation furnace, so as to solve the problems of poor safety and low reliability of existing internal gripper type lifting devices and the inconvenience of operation of external support type lifting devices.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A crucible transfer and unloading device for an intermittent vacuum distillation furnace includes: The lower end of the lifting eyelet is fixedly connected to a top connecting rod. A pair of booms, the top ends of which are respectively hinged to the two ends of the top connecting rod along its length; Connecting lugs are symmetrically arranged on the top connecting rod, and the line connecting the two connecting lugs is perpendicular to the length direction of the top connecting rod; The clamp includes two semi-circular clamping ring bodies, the slots of the two clamping ring bodies are spliced ​​together to form a circular channel for holding the crucible; each clamping ring body has lugs at both ends, and a connecting plate is clamped between each pair of opposite lugs and the lugs and the connecting plate are detachably fixedly connected. The fixing part is symmetrically arranged on the outer end face of the clamp, and the bottom ends of the boom are respectively hinged to the clamp through the fixing part; The line connecting the two fixing parts is substantially perpendicular to the line connecting the two connecting plates; Two iron chains are respectively connected between the connecting plate and the connecting lug located on the same side of the top connecting rod, and one of the iron chains is detachably fixed to the corresponding connecting plate; The crucible used in the intermittent vacuum distillation furnace crucible transfer and unloading device has a groove on its outer wall, and the ratio of the distance L from the center line of the groove to the top of the crucible to the total height H of the crucible is 1 / 3 to 1 / 2; the depth of the groove is greater than or equal to the thickness of the clamping ring body; the bottom surface of the groove is used to abut against the inner surface of the clamping ring body.

[0007] As a further improvement of this utility model, a first through hole is pre-set at the lower end of the lug and the connecting plate for detachably fixing the lug and the connecting plate by bolts and nuts.

[0008] As a further embodiment of this utility model, it also includes a pair of L-shaped lever arms; the short arm end of the L-shaped lever arm is fixed to the fixing part; and the long arm end of the L-shaped lever arm is sleeved with a quick-connect sleeve.

[0009] As a further embodiment of this utility model: the fixing part includes a hollow sleeve and ribs; the fixing part includes a hollow sleeve with one end welded to the outer end face of the clamp. The inner cavity of the hollow sleeve is machined with internal threads for engaging with the external threads provided on the short arm end of the L-shaped lever arm, thereby achieving a detachable and fixed connection between the two; a pair of ribs are provided opposite each other on the axial outer surface of the hollow sleeve; the boom is engaged between the ribs, and a second through hole is pre-set at the lower end of the boom and the ribs for hinged connection by a pin or bolt.

[0010] As a further improvement of this utility model, the detachable connection between the iron chain and the corresponding connecting plate is specifically achieved by the iron chain forming a detachable connection with the corresponding connecting plate through a shackle or hook.

[0011] As a further embodiment of this utility model: the connecting plate includes a first connecting plate and a second connecting plate, the first connecting plate and the second connecting plate are fixedly connected by bolts and nuts, and the top of the first connecting plate is connected to the corresponding iron chain, and the bottom of the second connecting plate is connected to the corresponding lug.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This application utilizes a groove at a specific location on the crucible to form a mechanical interlock with the clamp, avoiding the gripping method that relies on friction, thereby significantly improving the safety and reliability of lifting and transporting. The clamp holds the crucible within the groove, securing it mechanically rather than through friction, eliminating the risk of slippage caused by the smooth inner wall. The lifting components (such as the boom and clamp) primarily bear axial stress, rather than radial stress, reducing fatigue damage and plastic deformation. This not only extends service life but also prevents fracture accidents caused by high stress concentration, reducing the risk of crucible falling and protecting equipment and personnel safety.

[0013] 2. Utilizing the crucible transfer and unloading device for the intermittent vacuum distillation furnace described in this application, in addition to hoisting and transfer, a pair of L-shaped lever arms, a matching quick-connect sleeve, and a detachable chain can be used. The operator holds the quick-connect sleeve and applies upward force towards the gripping end, causing the crucible to tilt and pour out the liquid inside, thus achieving on-site unloading. This tilting method is convenient and efficient, facilitating the transport of materials unloaded from the crucible to the next process step, thereby improving the production capacity of the intermittent vacuum furnace. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the crucible transfer and unloading device for the intermittent vacuum distillation furnace in this embodiment of the present invention; Figure 2 for Figure 1 Figure A shows an enlarged structural diagram; Figure 3 for Figure 1 Enlarged structural diagram in Figure B; Figure 4 for Figure 1 Enlarged structural diagram in Figure C; Figure 5 This is a schematic top view of the crucible transfer and unloading device for the intermediate-section vacuum distillation furnace of this utility model. The correspondence between the labels and component names in the attached figures is as follows: 1. Lifting eye head; 2. Top connecting rod; 3. Lifting arm; 4. Fixing part; 5. Clamp; 6. Connecting lug; 7. Connecting plate; 8. First through hole; 9. Iron chain; 10. L-shaped lever arm; 11. Quick-connect sleeve; 12. Connecting crossbar; 40. Hollow sleeve; 41. Rib plate; 50. Clamping ring body; 51. Lug; 70. First connecting plate; 71. Second connecting plate; 100. Short arm end; 101. Long arm end. Detailed Implementation

[0015] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0016] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 A crucible transfer and unloading device for an intermittent vacuum distillation furnace, comprising: The lifting eye head 1 has a top connecting rod 2 fixedly connected to its lower end; the lifting eye head 1 is used to connect external lifting equipment such as a crane to provide a lifting point.

[0017] A pair of booms 3, the top ends of which are respectively hinged to the two ends of the top connecting rod 2 along the length direction; the top connecting rod 2 is fixedly connected to the lower end of the lifting ring head 1, serving as the supporting foundation for the booms 3.

[0018] Connecting lugs 6 are symmetrically arranged on the top connecting rod 2, and the line connecting the two connecting lugs is perpendicular to the length direction of the top connecting rod; The clamp 5 includes two semi-circular clamping ring bodies 50, the slots of the two clamping ring bodies 50 are spliced ​​together to form a circular channel for holding the crucible; each clamping ring body 50 has lugs 51 at both ends, and a connecting plate 7 is clamped between each pair of opposite lugs 51; a first through hole 8 is pre-set at the lower end of the lugs 51 and the connecting plate 7 for fixing the lugs 51 and the connecting plate 7 together with bolts and nuts; The fixing part 4 is symmetrically arranged on the outer end face of the clamp 5. The bottom ends of the boom 3 are respectively hinged to the clamp 5 through the fixing part 4. The fixing part 4 serves as the connection point between the boom 3 and the clamp 5, transmitting the lifting force from the boom 3 to the clamp 5. Its symmetrical design ensures uniform force distribution and prevents the clamp 5 from tilting. The hinged connection allows relative movement between the boom 3 and the clamp 5, accommodating minor displacements during the lifting process and reducing wear.

[0019] Specifically, to ensure stability during operation, the line connecting the two connecting plates 7 is substantially perpendicular to the line connecting the two fixing parts 4, i.e., in a cross shape. Those skilled in the art should understand that due to installation errors, the absolute perpendicularity of the connecting lines cannot be guaranteed. This vertical arrangement ensures that the direction of the tension force of the chain 9 is perpendicular to the direction of the lifting force of the boom 3, forming a stable force triangle. This prevents the clamp 5 from twisting or shifting during lifting, ensuring the crucible remains vertical.

[0020] Two iron chains 9 are respectively connected between the connecting plate 7 and the connecting lug 6 located on the same side of the top connecting rod 2, and one of the iron chains 9 is detachably fixedly connected to the corresponding connecting plate 7.

[0021] The crucible used in the intermittent vacuum distillation furnace crucible transfer and unloading device has a groove on its outer wall, and the ratio of the distance L from the center line of the groove to the top of the crucible to the total height H of the crucible is 1 / 3 to 1 / 2; the depth of the groove is greater than or equal to the thickness of the clamping ring body 50; the bottom surface of the groove is used to abut against the inner surface of the clamping ring body 50.

[0022] Specifically, in this application, the clamp 5 is used in conjunction with the groove provided on the outside of the crucible. During operation, the clamping ring body 50 of the clamp is directly placed in the groove and abuts against it. Through the lug 51, connecting plate 7 and first through hole 8 provided between the two clamping ring bodies 50, bolts and nuts are used to fasten and clamp the clamping ring body 50 to the crucible to be lifted and transferred in the horizontal direction.

[0023] The clamp 5, as the core gripping component, features a circular channel design that matches the crucible's recessed area, securing the crucible through mechanical interlocking rather than friction. The depth of the recessed area is greater than or equal to the thickness of the clamping ring body 50, ensuring that the clamping ring body 50 is fully embedded in the recess and preventing slippage during hoisting. The lug 51 and connecting plate 7 enhance the clamp's structural strength, while the bolted connection facilitates disassembly and maintenance.

[0024] Preferably, the crucible transfer and unloading device for the intermittent vacuum distillation furnace further includes a pair of L-shaped lever arms 10 for convenient on-site unloading operations. The short arm end 100 of the L-shaped lever arms 10 is fixed to the fixing part 4; the long arm end 101 of the L-shaped lever arms 10 is fitted with a quick-connect sleeve 11. With the L-shaped lever arms 10 and quick-connect sleeves 11 in combination, the crucible can be hoisted and transferred to the unloading location, and the operator can then attach the quick-connect sleeve 11 to the long arm end 101 of the L-shaped lever arms 10. At this time, the hoisting equipment on the lifting ring head 1 is kept in a lifting state; then the detachable chain connecting to the corresponding connecting plate 7 is released; finally, the operator grips the quick-connect sleeve 11 and applies upward force towards the gripping end to tilt the crucible, thereby pouring out the liquid inside. It should be noted that, of course, the unloading operation can also be performed using the above method. This application also allows the crucible to be hoisted to the work platform, and then the material to be poured using the existing traditional material pouring platform.

[0025] Preferably, the fixing part 4 includes a hollow sleeve 40 and ribs 41; the fixing part 4 includes a hollow sleeve 40 with one end welded to the outer end face of the clamp 5. The inner cavity of the hollow sleeve 40 is machined with internal threads for engaging with the external threads provided on the short arm end 100 of the L-shaped lever arm 10, thereby achieving a detachable fixed connection between the two; a pair of ribs 41 are provided opposite each other on the axial outer surface of the hollow sleeve 40; the boom 3 is engaged between the ribs 41, and a second through hole is pre-set through the lower end of the ribs 41 and the boom 3 for hinged connection by a pin or bolt. This threaded connection structure allows the L-shaped lever arm 10 to be used as an independent operating component, which can be removed from the fixing part 4 when not in use for easy storage and maintenance; when in use, it can be tightened to form a rigid lever force transmission mechanism.

[0026] To further ensure connection reliability, anti-loosening nuts can be added to the threaded connection or thread-locking agents can be used.

[0027] The aforementioned rib 41 enhances the shear strength of the hinge point, prevents the boom 3 from detaching, and ensures reliable hinge connection. This modular design facilitates maintenance and component replacement.

[0028] Preferably, to facilitate easier material unloading, the ends of the two quick-connect sleeves 11 opposite to the long arm end 101 are fixedly connected by a connecting crossbar 12. The connecting crossbar 12 ensures that the two lever arms move synchronously, preventing the clamp 5 from deflecting.

[0029] Preferably, the two quick-connect sleeves 11 and the connecting crossbar 12 are integrally formed.

[0030] Preferably, the detachable connection between the iron chain 9 and the corresponding connecting plate 7 is specifically as follows: the iron chain 9 forms a detachable connection with the corresponding connecting plate 7 through a shackle or hook.

[0031] Preferably, the connecting plate 7 includes a first connecting plate 70 and a second connecting plate 71. The first connecting plate 70 and the second connecting plate 71 are fixedly connected by bolts and nuts. The top of the first connecting plate 70 is connected to the corresponding iron chain 9, and the bottom of the second connecting plate 71 is connected to the corresponding lug 51.

[0032] The purpose of this design is that, when the crucible is clamped, the two semi-circular clamping ring bodies 50 are tightened by bolts, and their final closed state is a complete circle. However, the forces applied by the boom 3 and chain 9 come from the "side" and "above". If the connecting plate 7 is rigid, a huge bending moment will be generated at its connection with the clamping ring body through the lug. This bending moment will act entirely on the bolt in the first through hole 8, attempting to bend the bolt. Over time, this can lead to bolt fatigue, loosening, or even breakage, posing a safety hazard.

[0033] The solution employs a hinged connection plate: the core characteristic of a hinged joint is that it can only transmit force, not bending moment. During lifting, the tension of chain 9 is transmitted to the hinged joint through the first connecting plate 70, and then to the lug 51 and clamp 5 through the second connecting plate 71. During this process, the hinged joint allows the first connecting plate 70 and the second connecting plate 71 to rotate freely, automatically finding an optimal force transmission angle. This ensures that the force acting on the bolts is essentially pure tensile force, while harmful bending moment is greatly eliminated. In summary, this design not only extends the service life of the chain but also improves the safety and stability of the lifting device under long-term, repeated use.

[0034] How this application works: During operation, when the crucible needs to be hoisted and transported, the clamp 5 is first used to cooperate with the groove on the outside of the crucible. The clamp body 50 of the clamp is placed directly in the groove and abuts against it. Through the lug 51, connecting plate 7 and first through hole 8 provided between the two clamp bodies 50, bolts and nuts are used to fasten and clamp the clamp body 50 to the crucible to be hoisted and transported in the horizontal direction.

[0035] Keep the lifting equipment on the lifting ring head 1 in the lifting state, lift the crucible out of the vacuum reduction furnace and transfer it to the place where it is to be poured; during the lifting process, the lifting force is transmitted to the clamp 5 through the boom 3 and the fixing part 4. The clamp 5 and the groove of the crucible form a mechanical interlock, so that the crucible can be lifted reliably and stably.

[0036] Further, the quick-connect sleeve 11 is fitted onto the long arm end 101 of the L-shaped lever arm 10; then the detachable iron chain 9 between the lever arm and the corresponding connecting plate 7 is untied; finally, the operator holds the quick-connect sleeve 11 and applies upward force towards the holding end to tilt the crucible, thereby pouring out the liquid inside the crucible.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A crucible transfer and unloading device for an intermittent vacuum distillation furnace, characterized in that, include: The lower end of the lifting ring head (1) is fixedly connected to the top connecting rod (2); A pair of booms (3), the top ends of which are respectively hinged to the two ends of the top connecting rod (2) in the length direction; Connecting lugs (6) are symmetrically arranged on the top connecting rod (2), and the line connecting the two connecting lugs is perpendicular to the length direction of the top connecting rod; The clamp (5) includes two semi-circular clamping ring bodies (50), the slots of the two clamping ring bodies (50) are spliced ​​together to form a circular channel for holding the crucible; each clamping ring body (50) has lugs (51) at both ends, and a connecting plate (7) is clamped between each pair of opposite lugs (51), and the lugs (51) and the connecting plate (7) are detachably fixedly connected; The fixing part (4) is symmetrically arranged on the outer end face of the clamp (5), and the bottom end of the boom (3) is respectively hinged to the clamp (5) through the fixing part (4); The line connecting the two fixing parts (4) is substantially perpendicular to the line connecting the two connecting plates (7); Two iron chains (9) are respectively connected between the connecting plate (7) and the connecting lug (6) located on the same side of the top connecting rod (2), and one of the iron chains (9) is detachably fixedly connected to the corresponding connecting plate (7); The crucible used in the intermittent vacuum distillation furnace crucible transfer and pouring device has a groove on its outer wall, and the ratio of the distance L from the center line of the groove to the top of the crucible to the total height H of the crucible is 1 / 3 to 1 / 2; the depth of the groove is greater than or equal to the thickness of the clamping ring body (50); the bottom surface of the groove is used to abut against the inner surface of the clamping ring body (50).

2. The crucible transfer and unloading device for an intermittent vacuum distillation furnace according to claim 1, characterized in that, A first through hole (8) is pre-set at the lower end of the lug (51) and the connecting plate (7) for detachably fixing the lug (51) and the connecting plate (7) by means of bolts and nuts.

3. The crucible transfer and unloading device for an intermittent vacuum distillation furnace according to claim 1, characterized in that, Each of the fixed parts (4) is provided with an L-shaped lever arm (10); the short arm end (100) of the L-shaped lever arm (10) is detachably fixed to the fixed part (4); the long arm end (101) of the L-shaped lever arm (10) is fitted with a quick docking sleeve (11).

4. The crucible transfer and unloading device for an intermittent vacuum distillation furnace according to claim 3, characterized in that, The fixing part (4) includes a hollow sleeve (40) and a rib (41); the fixing part (4) includes a hollow sleeve (40) with one end welded to the outer end face of the clamp (5). The inner cavity of the hollow sleeve (40) is machined with an internal thread for engaging with the external thread provided on the short arm end (100) of the L-shaped lever arm (10), thereby realizing a detachable fixed connection between the two; a pair of ribs (41) are provided opposite to each other on the axial outer surface of the hollow sleeve (40); the boom (3) is engaged between the ribs (41), and a second through hole is pre-set at the lower end of the ribs (41) and the boom (3) for hinged connection by a pin or bolt.

5. The crucible transfer and unloading device for an intermittent vacuum distillation furnace according to claim 3, characterized in that, The ends of the two quick-connect sleeves (11) opposite to the long arm end (101) are fixedly connected by a connecting crossbar (12).

6. The crucible transfer and unloading device for an intermittent vacuum distillation furnace according to claim 5, characterized in that, The two quick-connect sleeves (11) and the connecting crossbar (12) are integrally formed.

7. The crucible transfer and unloading device for an intermittent vacuum distillation furnace according to claim 2, characterized in that, The detachable connection between the chain (9) and the corresponding connecting plate (7) is specifically as follows: the chain (9) is detachably connected to the corresponding connecting plate (7) by means of a shackle or hook.

8. The crucible transfer and unloading device for an intermittent vacuum distillation furnace according to claim 7, characterized in that, The connecting plate (7) includes a first connecting plate (70) and a second connecting plate (71). The first connecting plate (70) and the second connecting plate (71) are fixedly connected by bolts and nuts. The top of the first connecting plate (70) is connected to the corresponding iron chain (9), and the bottom of the second connecting plate (71) is connected to the corresponding lug (51).

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