Pressing tool for sand shell casting

Abstract

The utility model discloses a pressing tool for sand shell casting, which comprises a bottom plate, a top plate and a tensioning component, the top plate is horizontally arranged right above the bottom plate in parallel, a plurality of sand mold shell units to be cast are stacked between the bottom plate and the top plate, and the tensioning component is arranged on the bottom plate. The two ends of the bottom plate are connected with the top plates above through the tensioning assemblies correspondingly. The tensioning assembly comprises a lower pulling strip, a sleeve, an upper pulling screw and a pressing lock nut, the bottom end of the lower pulling strip is connected with the bottom plate, the upper portion of the lower pulling strip penetrates into a middle hole of the sleeve, and the sleeve is locked at the position of the lower pulling strip through a locking mechanism; the outer side wall of the sleeve is fixedly connected with the pull-up screw, and the top end of the pull-up screw penetrates through the through hole in the top plate and is in threaded connection with the pressing lock nut for pressing. According to the pressing tool for sand shell casting, the pressing height can be rapidly adjusted, and the requirement for a large height adjusting range is met.

Description

Technical Field

[0001] The utility model relates to the technical field of coated sand casting, in particular to a pressing tool for shell casting. Background Art

[0002] The coated sand casting process is also called the "shell casting process" or the "heating hardening process". The coated sand casting process is widely used in the production of various complex castings. In particular, it is very effective to use coated sand to make cores for sand cores with high requirements for the surface quality of the inner cavity of castings, high dimensional accuracy requirements, and complex shapes. Its process is as follows: First, coated sand is used as the material, and a shell mold is manufactured using a metal hot core box mold; the cavity provided in the shell mold has the same shape as the casting, and the size is the casting size scaled according to the shrinkage ratio of the material; then, high-temperature liquid materials such as molten iron are poured into the cavity, and the casting is obtained after cooling and solidification.

[0003] When pouring the shell, in order to reduce the number of times of moving the ladle in the middle, multiple sand mold shell units are often stacked together for pouring molten steel, such as the technical solution disclosed in the invention patent with the publication number CN101879582A. The molten steel sequentially passes through the runners between each sand mold shell unit from top to bottom, and the casting is completed one by one starting from the bottom sand mold shell unit. During the production process of the applicant's coated sand casting, in order to improve the quality of the casting process, it is stipulated that each ladle of molten steel only completes the casting of a group of stacked sand mold shell units, so as to reduce the transfer time of the ladle. However, the mass of the molten steel transported by the ladle each time is about 1 ton, and the weights of the cast products are different, so it is necessary to adjust the number of stacked sand mold shell units to match the ladle transportation volume. The height adjustment range of the existing pressing tool for the sand mold shell units stacked at the casting station is relatively narrow and cannot meet the requirements.

[0004] Therefore, it is necessary to develop a pressing tool for shell casting to address the above-mentioned defects. Content of the Utility Model

[0005] The purpose of the utility model is to provide a pressing tool for shell casting, which can quickly adjust the pressing height and meet the requirements of a large height adjustment range.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The compacting tooling for sand shell casting of the utility model comprises a bottom plate, a top plate and a tensioning assembly. The top plate is horizontally and parallelly arranged directly above the bottom plate. A plurality of sand mold shell units to be cast are stacked between the bottom plate and the top plate. Both ends of the bottom plate are respectively connected to the upper top plate through a set of the tensioning assembly. The tensioning assembly includes a lower pull bar, a sleeve, an upper pull screw and a compression lock nut. The bottom end of the lower pull bar is connected to the bottom plate and the upper part penetrates into the middle hole of the sleeve. The sleeve is locked at a position on the lower pull bar through a locking mechanism. The outer side wall of the sleeve is fixedly connected to the upper pull screw. The top end of the upper pull screw passes through a through hole on the top plate and is threadedly connected to the compression lock nut for compaction.

[0008] Further, the locking mechanism includes a set screw. Anti-slip structures are arranged on the outer walls of the middle part and the upper part of the lower pull bar. A threaded platform is arranged on the outer wall of the sleeve. The middle hole of the threaded platform is a threaded hole. The set screw is threadedly connected to the threaded hole and the inner end head can abut against the anti-slip structure.

[0009] Further, the anti-slip structure includes concave platforms. A plurality of the concave platforms are arranged at equal intervals along the length direction of the lower pull bar. The outer diameter of the inner end head of the set screw is smaller than the height of the concave platform and can abut against the bottom surface of the concave platform.

[0010] Further, a gate relief hole for installing a gate cup is opened in the middle of the top plate. Long strip holes are respectively opened on both sides of the gate relief hole on the top plate. The long strip holes are opened at the edge of the top plate. The top end of the upper pull screw passes through the long strip hole and is locked by the compression lock nut.

[0011] Further, the gate relief hole is a waist-shaped hole. Two gate cups can be placed at the left and right ends of the gate relief hole.

[0012] Further, it also includes a large flat washer. The compression lock nut is specifically a wing nut. The wing nut is threadedly connected to the top end of the upper pull screw and presses the large flat washer sleeved on the upper pull screw against the long strip hole.

[0013] Further, it also includes a pin shaft seat. The root of the lower pull bar is connected to the end of the top surface of the bottom plate through a pin shaft and the pin shaft seat. The axial direction of the pin shaft is perpendicular to the long side direction of the long strip hole.

[0014] Compared with the prior art, the beneficial technical effects of the utility model are:

[0015] This pressing tool for shell sand casting can adjust the total length of the tensioning assembly composed of a pull-down bar, a sleeve and an upper pull screw by adjusting the overlapping length of the pull-down bar and the upper pull screw, so as to adapt to the stacking height of sand mold shell units of different specifications. By setting the locking mechanism, the height position of the sleeve on the pull-down bar can be locked to prevent loosening. This pressing tool for shell sand casting of the utility model can quickly adjust the pressing height and meet the requirements of a large height adjustment range.

[0016] In addition, by using a setscrew to press tightly against the anti-slip structure of the pull-down bar in the locking mechanism, a better anti-loosening effect can be achieved; by adopting the anti-slip structure in the form of multiple continuously arranged concave platforms, the inner end of the setscrew abuts against the bottom surface of the concave platform to achieve effective anti-loosening locking, avoiding the sliding of the sleeve relative to the pull-down bar. At the same time, the side retaining edge of the concave platform is relatively high, and a wrench tool is not required to lock the setscrew during the actual rotation process, and it can be manually tightened. By setting a long slot with an opening at the edge of the top plate, it is convenient to directly insert the top end of the upper pull screw into the long slot from the outside of one side, avoiding inserting the upper pull screw during the process of lowering the top plate, and the operation safety is good. By setting a large-pitch threaded connection with a wing nut, the height position of the wing nut can be quickly adjusted. At the same time, the two lugs of the wing nut are also convenient for the operator to manually rotate the nut, avoiding searching for tools everywhere, and the operation is more convenient. By setting a pin shaft seat at the root of the pull-down bar, after the nut at the top of the whole tensioning assembly is loosened by a certain distance, the whole assembly only needs to swing outward to disengage from the long slot, without completely removing the nut, which can achieve quick installation and quick disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following further describes the present utility model with reference to the drawings.

[0018] Figure 1 It is a front view structural schematic diagram of the pressing tool for shell sand casting of the present utility model;

[0019] Figure 2 It is a top view structural schematic diagram of the top plate in the present utility model;

[0020] Figure 3 It is a top view structural schematic diagram of the top plate in another embodiment of the present utility model;

[0021] Figure 4 is Figure 1 The sectional structural schematic diagram of the A-A part in.

[0022] Description of the reference numerals: 1, bottom plate; 2, top plate; 201, gate relief hole; 202, long hole; 3, pull-down bar; 301, anti-slip structure; 4, sleeve; 401, threaded platform; 5, setscrew; 6, upper pull screw rod; 7, wing nut; 8, large flat washer; 9, pin seat; 10, sand mold shell unit; 11, pouring cup. Detailed implementation manners

[0023] The core of the present utility model is to provide a pressing tooling for sand shell casting, which can quickly adjust the pressing height to meet the requirements of a large height adjustment range.

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0026] Referring to the accompanying drawings, Figure 1 is the front view structural schematic diagram of the pressing tooling for sand shell casting of the present utility model; Figure 2 is the top view structural schematic diagram of the top plate in the present utility model; Figure 3 is the top view structural schematic diagram of the top plate in another embodiment of the present utility model; Figure 4 is Figure 1 the sectional view structural schematic diagram of the A-A part in

[0027] In a specific implementation manner, as Figures 1 to 4As shown in the figure, the pressing tooling for sand shell casting of the present utility model includes a bottom plate 1, a top plate 2, and a tensioning assembly. Both the bottom plate 1 and the top plate 2 are rectangular plates. The top plate 2 is horizontally and parallelly arranged directly above the bottom plate 1. A plurality of sand mold shell units 10 to be cast are stacked between the bottom plate 1 and the top plate 2. The sand mold shell units 10 are connected in series through runners. Both ends of the bottom plate 1 are respectively connected to the upper top plate 2 through a set of tensioning assemblies. The tensioning assembly includes a lower pull bar 3, a sleeve 4, an upper pull screw 6, and a pressing lock nut. The bottom end of the lower pull bar 3 is connected to the bottom plate 1, and the lower pull bar 3 is a round steel, and its upper part penetrates into the middle hole of the sleeve 4. The sleeve 4 is locked at its height position on the lower pull bar 3 through a locking mechanism. The outer side wall of the sleeve 4 is welded and connected to the upper pull screw 6. The middle hole of the sleeve 4 and the axis line of the upper pull screw 6 are parallelly arranged. After the top end of the upper pull screw 6 passes through the through hole on the top plate 2, the top end of the upper pull screw 6 is threadedly connected to the pressing lock nut, and the pressing lock nut presses the top plate 2.

[0028] Specifically, the through hole on the top plate 2 is a round hole, and the diameter of the round hole is smaller than the outer diameter of the pressing lock nut.

[0029] For the tensioning assembly composed of the lower pull bar 3, the sleeve 4, and the upper pull screw 6, by adjusting the overlapping length of the lower pull bar 3 and the upper pull screw 6, the total length of the tensioning assembly can be adjusted, and thus the adaptation to the stacking height of different specifications of sand mold shell units 10 can be realized. By setting the locking mechanism, the height position of the sleeve 4 on the lower pull bar 3 can be locked to avoid loosening.

[0030] In a specific embodiment of the present utility model, as Figure 1 and Figure 4 shown, the locking mechanism includes a setscrew 5. Anti-slip structures 301 are provided on the outer walls of the middle part and the upper part of the lower pull bar 3. A threaded platform 401 is provided on the outer wall of the sleeve 4. The threaded platform 401 is welded to the outer wall of the sleeve 4. The middle hole of the threaded platform 401 is a threaded hole, and this threaded hole also penetrates the side wall of the sleeve 4. The setscrew 5 is threadedly connected to the threaded hole and the inner end head can abut against the anti-slip structure 301.

[0031] Obviously, the locking mechanism can also adopt the method of inserting a positioning pin, that is, a plurality of pin holes are equally spaced in the height direction of the lower pull bar 3, and a pair of pin holes are also opened on the outer wall of the sleeve 4. By selecting a suitable pin hole to insert a positioning pin for height adjustment, similar technical effects can also be achieved, but only the operation is relatively cumbersome. Similar simple deformation methods all fall within the protection scope of the present utility model.

[0032] Specifically, as Figure 1 and Figure 4As shown, the anti-slip structure 301 includes concave platforms. A plurality of the concave platforms are arranged at equal intervals along the length direction of the pull-down bar 3. The outer diameter of the inner end of the setscrew 5 is smaller than the height of the concave platform and can abut against the bottom surface of the concave platform.

[0033] Specifically, as Figure 4 shown, the fit clearance between the middle hole of the sleeve 4 and the pull-down bar 3 is 2-3 mm. The relatively large fit clearance can prevent the mold sand from clogging and reduce the failure of being unable to move after clogging. If jamming occurs, a hammer can be used to vibrate and strike to achieve sand removal.

[0034] By using the setscrew 5 of the locking mechanism to tightly press on the anti-slip structure 301 of the pull-down bar 3, a good anti-loosening effect can be achieved; by using the anti-slip structure 301 in the form of a plurality of continuously arranged concave platforms, the inner end of the setscrew 5 abuts against the bottom surface of the concave platform to achieve effective anti-loosening and locking, avoiding the sleeve 4 from sliding relative to the pull-down bar 3. At the same time, the side retaining edge height of the concave platform is relatively high, and a wrench tool is not required to lock during the actual rotation of the setscrew 5, and manual tightening is sufficient.

[0035] In a specific embodiment of the present invention, as Figure 2 shown, a gate relief hole 201 for installing the gate cup 11 is opened in the middle of the top plate 2, that is, the root of the gate cup 11 passes through the gate relief hole 201 and is connected to the gate of the top-layer sand mold shell unit 10. Long strip holes 202 are respectively opened on both sides of the gate relief hole 201 of the top plate 2. The length direction of the long strip holes 202 is perpendicular to the edge of the top plate 2, and the long strip holes 202 are opened at the edge of the top plate 2. The top end of the upper pull screw 6 passes through the long strip holes 202 and is locked with a compression lock nut.

[0036] By providing the long strip holes 202 opened at the edge of the top plate 2, it is convenient to directly insert the top end of the upper pull screw 6 into the long strip holes 202 from the outside of the side, avoiding inserting the upper pull screw 6 during the process of lowering the top plate 2, and the operation safety is good.

[0037] In another specific embodiment of the present invention, as Figure 3 shown, the gate relief hole 201 is a waist-shaped hole, and two gate cups 11 can be placed at the left and right ends of the gate relief hole 201. Two stacks of sand mold shell units 10 with the same height can be placed between the bottom plate 1 and the top plate 2.

[0038] In a specific embodiment of the present invention, as Figure 1 shown, the compacting tooling for sand shell casting of the present invention further includes a large flat washer 8. The compression lock nut specifically uses a wing nut 7. The wing nut 7 is threadedly connected to the top end of the upper pull screw 6 and presses the large flat washer 8 sleeved on the upper pull screw 6 against the long strip holes 202. The thread between the wing nut 7 and the upper pull screw 6 is a large pitch thread.

[0039] By setting a large-pitch thread to connect the wing nut 7, it is possible to quickly adjust the height position of the wing nut 7. At the same time, the two lugs of the wing nut 7 also facilitate the operator to manually rotate the nut, avoiding the need to search for tools everywhere and making the operation more convenient.

[0040] In a specific embodiment of the present invention, as Figure 1 shown, the compacting tooling for shell sand casting of the present invention further includes a pin shaft seat 9. The root of the lower pull bar 3 is connected to the end of the top surface of the bottom plate 1 through a pin shaft and the pin shaft seat 9. The axial direction of the pin shaft is perpendicular to the long side direction of the long slot 202.

[0041] By providing a pin shaft seat 9 at the root of the lower pull bar 3, after the nut at the top of the entire tensioning assembly is loosened by a certain distance, the whole set can be disengaged from the long slot 202 by simply swinging it outwards, without completely removing the nut, thus enabling quick installation and quick disassembly.

[0042] |The working process of the compacting tooling for shell sand casting in this embodiment: First, check whether the top surface of the bottom plate 1 is horizontal. If not, level it by adjusting the bottom cushion. Stack the sand mold shell units 10 at the middle position of the bottom plate 1, and pay attention to using molding sand for bonding between layers to ensure reliable sealing and unblocked runners. The number of sand mold shell units 10 is calculated based on the mass of the molten steel transported by the ladle. After reaching the set number of sand mold shell units 10, hoist the top plate 2 and horizontally press it against the top surface of the topmost sand mold shell unit 10. Note that the position of the long slot 202 on the top plate 2 corresponds to the pin shaft seat 9. Install the tensioning assembly, swing the lower pull bar 3 upright and pull the upper pull screw 6 close to the top plate 2, and observe whether the height of the top end of the upper pull screw 6 is appropriate. If not, loosen the setscrew 5, move the sleeve 4 to adjust the height position relative to the lower pull bar 3, and then manually tighten the setscrew 5 again after it is appropriate. The inner end of the setscrew 5 abuts against the bottom surface of the concave platform. Continue to swing the lower pull bar 3 inwards, the top end of the upper pull screw 6 moves from the opening to the long slot 202, put down the large flat washer 8 with fingers, the large flat washer 8 falls onto the top surface of the long slot 202, and quickly rotate the wing nut 7 downwards to initially press it against the large flat washer 8. Install the tensioning assembly on the other side in the same way, and finally gradually and alternately tighten the two wing nuts 7 to complete the final tightening. Install the sprue cup 11 on the sprue of the topmost sand mold shell unit 10, and after moving the ladle into place, casting can be carried out.

[0043] In summary, for the pressing tooling for sand shell casting of the present utility model, by means of the tensioning assembly composed of the lower pull bar 3, the sleeve 4 and the upper pull screw 6, adjusting the overlapping length of the lower pull bar 3 and the upper pull screw 6 can achieve the adjustment of the total length of the tensioning assembly, and further achieve the adaptation to the stacking height of sand mold shell units 10 of different specifications. By providing the locking mechanism, the height position of the sleeve 4 on the lower pull bar 3 can be locked to prevent loosening. In addition, by using the set screw 5 of the locking mechanism to press tightly against the anti-slip structure 301 of the lower pull bar 3, a good anti-loosening effect can be achieved; by using the anti-slip structure 301 in the form of a plurality of continuously arranged concave platforms, the inner end of the set screw 5 abuts against the bottom surface of the concave platform to achieve effective anti-loosening locking, preventing the sleeve 4 from sliding relative to the lower pull bar 3. At the same time, the side retaining edge of the concave platform is relatively high, and a wrench tool is not required to lock the set screw 5 during actual rotation, and it can be manually tightened. By providing the long slot 202 with an opening at the edge of the top plate 2, it is convenient to directly insert the top end of the upper pull screw 6 into the long slot 202 from the outer side of the side, avoiding inserting the upper pull screw 6 during the process of lowering the top plate 2, and the operation safety is good. By providing the wing nut 7 with a large pitch thread connection, the height position of the wing nut 7 can be quickly adjusted. At the same time, the two lugs of the wing nut 7 are also convenient for the operator to manually rotate the nut, avoiding searching for tools everywhere, and the operation is more convenient. By providing the pin shaft seat 9 at the root of the lower pull bar 3, after the nut at the top of the whole tensioning assembly is loosened by a certain distance, it only needs to swing outward to disengage from the long slot 202, and there is no need to completely remove the nut, which can achieve quick installation and quick disassembly.

[0044] In the present specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0045] The embodiments described above are only descriptions of the preferred modes of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A clamping tool for sand shell casting, characterized in that: It comprises a bottom plate (1), a top plate (2) and a tensioning assembly, wherein the top plate (2) is horizontally and parallelly arranged directly above the bottom plate (1), and a plurality of sand mold shell units (10) to be cast are stacked between the bottom plate (1) and the top plate (2), and the two ends of the bottom plate (1) are respectively connected to the top plate (2) above through a set of the tensioning assembly; the tensioning assembly comprises a lower pull bar (3), a sleeve (4), an upper pull screw (6) and a clamping lock nut, the bottom end of the lower pull bar (3) is connected to the bottom plate (1) and the upper part is inserted into the middle hole of the sleeve (4), and the sleeve (4) is locked in position on the lower pull bar (3) by a locking mechanism; the outer wall of the sleeve (4) is fixedly connected to the upper pull screw (6), and the top end of the upper pull screw (6) passes through the through hole on the top plate (2) and is threadedly connected to the clamping lock nut for clamping.

2. The pressing tool for sand shell casting according to claim 1, characterized in that: The locking mechanism comprises a top screw (5), and an anti-slip structure (301) is arranged on the outer wall of the middle and upper parts of the pull-down bar (3); a threaded platform (401) is arranged on the outer wall of the sleeve (4), and the hole in the threaded platform (401) is a threaded hole, and the top screw (5) is threadedly connected to the threaded hole and the inner end can abut against the anti-slip structure (301).

3. The pressing tool for sand shell casting according to claim 2, characterized in that: The anti-slip structure (301) comprises a concave platform, and a plurality of the concave platforms are arranged at equal intervals along the length direction of the pull-down strip (3); the outer diameter of the inner end of the top screw (5) is smaller than the height of the concave platform and can abut against the bottom surface of the concave platform.

4. The pressing tool for sand shell casting according to claim 1, characterized in that: A gate clearance hole (201) for installing a gate cup (11) is provided in the middle of the top plate (2), and long holes (202) are respectively provided on both sides of the gate clearance hole (201) of the top plate (2), and the long holes (202) are opened at the edge of the top plate (2); the top end of the pull-up screw (6) passes through the long hole (202) and is locked by the clamping lock nut.

5. The pressing tool for sand shell casting according to claim 4, characterized in that: The gate clearance hole (201) is a waist-shaped hole, and two gate cups (11) can be placed at the left and right ends of the gate clearance hole (201).

6. The pressing tool for sand shell casting according to claim 4, characterized in that: It also includes a large flat washer (8), and the clamping lock nut specifically adopts a butterfly nut (7). The butterfly nut (7) is threadedly connected to the top of the pull-up screw rod (6) and presses the large flat washer (8) sleeved on the pull-up screw rod (6) onto the long hole (202).

7. The pressing tool for sand shell casting according to claim 4, characterized in that: It also includes a pin seat (9), and the root of the lower pull bar (3) is connected to the end of the top surface of the bottom plate (1) through a pin and the pin seat (9); the axial direction of the pin is perpendicular to the long side direction of the long strip hole (202).

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