Core bar special for pump body casting runner sand core

Abstract

The utility model discloses a special core bar for a pump body casting runner sand core, which comprises a bending part, two longitudinal rods and at least two transverse rods, the number of the longitudinal rods is two and is parallel to each other, the middle parts of the two longitudinal rods are respectively provided with at least two through holes which transversely penetrate through the longitudinal rods, and the outer side walls of the transverse rods are provided with clamping grooves; after the transverse rod penetrates through the through holes of the two longitudinal rods at the same time, the transverse rod rotates relative to the through holes so that the clamping grooves can be clamped and matched with the edges of the through holes. Two connecting ends are arranged at the same end of the bending part, and each connecting end of the bending part is connected with one end of each longitudinal rod in a quick-release mode through a rotary splicing structure. According to the core bar special for the flow channel sand core of the pump body casting, the flow channel sand cores with the same or similar diameter can share most core bar parts, assembly is easy, and the stock space needed by the core bar is reduced.

Description

Technical Field

[0001] This utility model relates to the field of pump body casting, and in particular to a special core for the flow channel sand core of pump body casting. Background Technology

[0002] A centrifugal pump is a device that uses the rotation of an impeller to cause water to move at a centrifugal speed. After the pump motor starts, the pump shaft drives the impeller and the liquid to rotate at high speed in the pump body. The water undergoes centrifugal motion and is thrown towards the outer edge of the impeller, flowing into the pump body's pressure pipe through the flow channel of the volute casing.

[0003] Currently, in the production of pump body castings using sand casting, the runner sand core is typically made in two halves, hardened after casting, and then bonded together using an adhesive after demolding. To improve the strength of the runner sand core, a core frame is usually embedded inside it. However, even pump bodies of different specifications, with the same runner diameter, have different runner lengths. Currently, to accommodate runners of different lengths, different specifications of core frames are required. Traditional core frames are made by welding multiple metal rods, which not only results in slow overall welding speed but also prevents the use of core frames interchangeably between different pump body specifications. This necessitates the production of multiple core frames of different specifications, requiring a large inventory and occupying warehouse storage space. Utility Model Content

[0004] The purpose of this invention is to provide a special core for the flow channel sand core of pump body castings. Flow channel sand cores with the same or similar diameter can share most of the core component, and the assembly is simple, reducing the storage space required for the core.

[0005] To achieve the above objectives, this utility model provides a special core for the flow channel sand core of a pump body casting, including a curved section, longitudinal rods, and transverse rods. There are two longitudinal rods that are parallel to each other, and at least two transverse rods that are parallel to each other. Each of the two longitudinal rods has at least two through holes that pass through the longitudinal rods laterally. The outer wall of the transverse rod has a groove. After the transverse rod passes through the through holes of the two longitudinal rods at the same time, the transverse rod rotates relative to the through holes to make the groove engage with the edge of the through hole. The same end of the curved section has two connecting ends. Each connecting end of the curved section is connected to one end of each longitudinal rod by a quick-release connection through a rotating splicing structure.

[0006] As a further improvement of this utility model, the cross-section of the through hole of the longitudinal rod is polygonal, and the transverse rod includes three transverse rod bodies and two connecting rods. The cross-section of the transverse rod body is polygonal and matches the cross-sectional shape of the through hole. Each connecting rod is connected between two adjacent transverse rod bodies. Each connecting rod is arranged coaxially with the transverse rod body. The outer wall of the connecting rod does not extend beyond the outer wall of the transverse rod body. The corner of the end edge of two adjacent transverse rod bodies and the outer wall of the connecting rod together form the slot.

[0007] As a further improvement of this utility model, the rotary splicing structure includes a plug shaft and a sleeve. The sleeve has plug holes at the center of both ends. The plug shaft is located at the end of the longitudinal rod and at each connecting end of the bent portion. At least two protrusions are arranged around the axis of the plug shaft on its sidewall. The sleeve has a longitudinal groove at its end, located outside the plug hole and connected to it. The inner wall of the plug hole of the sleeve has a transverse groove, one end of which is connected to the longitudinal groove. The plug shaft and the plug hole are longitudinally plugged in and rotatably engaged. The protrusions and the longitudinal groove are longitudinally slidably engaged, and the protrusions and the transverse groove are transversely slidably engaged.

[0008] As a further improvement of this utility model, at least one of the axial end faces of the transverse slide is an inclined plane, which is not perpendicular to the axis of the sleeve. The inclined plane causes the longitudinal width of the transverse slide to gradually decrease from the end closer to the longitudinal slide to the end farther away from the longitudinal slide.

[0009] As a further improvement of this utility model, a hexagonal protrusion is provided on the outer side wall of the sleeve.

[0010] As a further improvement of this utility model, the bending part includes a first bending rod and a second bending rod, and the first bending rod and the second bending rod are connected by at least two reinforcing rods; the two connecting ends of the bending part are respectively located at one end of the first bending rod and the second bending rod.

[0011] As a further improvement of this utility model, both the curved part and the longitudinal rod are provided with lifting lugs.

[0012] Beneficial effects

[0013] Compared with the prior art, the advantages of the special core for the flow channel sand core of the pump body casting of this utility model are:

[0014] 1. The curved parts, longitudinal bars and transverse bars of the core can be spliced ​​together without welding, eliminating the need to fix each component to the welding bracket for positioning before welding, making assembly quick.

[0015] 2. The crossbar is rotated and snapped into place by passing through the through hole of the longitudinal bar laterally, which is convenient for installation and disassembly. According to the required diameter of the end of the sand mold of the pump body flow channel, the crossbar of the corresponding length can be installed without replacing the longitudinal bar, which makes the parts more versatile.

[0016] 3. A sleeve is provided between the connecting end of the curved section and the longitudinal rod. The insertion hole of the sleeve is adapted to the insertion shaft, and a rotatable snap-fit ​​is achieved through the cooperation of a protrusion, a longitudinal slide groove, and a transverse slide groove. By simply changing the sleeve of different lengths, the overall length of the core can be changed, thus allowing its use in flow channel sand cores of different lengths. Even if the required diameter of the curved section of the flow channel sand core varies, only curved sections with different bending radii need to be manufactured separately, reducing the production cost of the core.

[0017] 4. The inclined surface inside the transverse slide groove causes the longitudinal width of the transverse slide groove to gradually decrease from the end closest to the longitudinal slide groove to the end furthest from the longitudinal slide groove. As the protrusion of the plug shaft is screwed into the transverse slide groove, it is gradually pressed tight to prevent it from shaking.

[0018] 5. The outer wall of the sleeve is provided with a hexagonal protrusion, which can be clamped and rotated by a wrench for easy tightening and loosening.

[0019] The present invention will become clearer from the following description and in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A partial sectional view of the main view of the core material for the flow channel sand core of the pump body casting;

[0022] Figure 2 Component disassembly diagram of the core skeleton for the flow channel sand core of the pump body casting;

[0023] Figure 3 This is the front view of the crossbar;

[0024] Figure 4 This is a 3D view of the crossbar;

[0025] Figure 5 for Figure 3 Sectional view along axis AA;

[0026] Figure 6 A front view of a core material specifically designed for the flow channel sand core of a pump body casting with a relatively long sleeve;

[0027] Figure 7 This is a partial side view of the longitudinal member;

[0028] Figure 8 This is a side view of the crossbar body and the through holes on the longitudinal bars;

[0029] Figure 9 This is a partial sectional view from the side after the crossbar is inserted into the through hole and rotated 45 degrees relative to the longitudinal bar.

[0030] Figure 10 This is a side view of the crossbar after it has been inserted into the through hole and rotated 45 degrees relative to the longitudinal bar.

[0031] Figure 11 This is a top view of the sleeve;

[0032] Figure 12 The front view of the insertion shaft and a partial half-section view of the front view of the sleeve are shown.

[0033] Figure 13 This is a side view of the lug on the longitudinal rod. Detailed Implementation

[0034] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0035] Example

[0036] The specific embodiments of this utility model are as follows: Figures 1 to 13 As shown, a special core frame for the flow channel sand core of a pump body casting includes a bent portion 2, longitudinal rods 1, and transverse rods 5. There are two parallel longitudinal rods 1 and at least two parallel transverse rods 5. Each of the two longitudinal rods 1 has at least two through holes 6 extending transversely through the middle of the longitudinal rod 1. The outer wall of the transverse rod 5 has a groove 53. After the transverse rod 5 passes through the through holes 6 of both longitudinal rods 1 simultaneously, the transverse rod 5 rotates relative to the through holes 6 to engage the groove 53 with the edge of the through hole 6. The bent portion 2 has two connecting ends at the same end, and each connecting end of the bent portion 2 is quickly connected to one end of each longitudinal rod 1 via a rotating splicing structure. In this embodiment, there are three transverse rods 5, and each longitudinal rod 1 has three through holes 6 in its middle. The bent portion 2 corresponds to the bend in the flow channel sand core, and the frame formed by the longitudinal rods 1 and transverse rods 5 corresponds to the part of the flow channel sand core near the pump casing.

[0037] The through hole 6 of the longitudinal rod 1 has a square cross-section. The transverse rod 5 includes three transverse rod bodies 51 and two connecting rods 52. The cross-section of the transverse rod body 51 is square and matches the cross-sectional shape of the through hole 6, with a clearance fit between them. Each connecting rod 52 connects to two adjacent transverse rod bodies 51. Each connecting rod 52 is arranged coaxially with the transverse rod body 51. The outer wall of the connecting rod 52 does not extend beyond the outer wall of the transverse rod body 51. The corner of the end edge of two adjacent transverse rod bodies 51 and the outer wall of the connecting rod 52 together form a groove 53. In this embodiment, the side wall of the connecting rod 52 is a flat surface except for the part flush with the outer wall of the transverse rod body 51. The center of the arc surface coincides with the center line of the transverse rod 5, and the diameter of the arc surface is basically the same as the width of the square through hole 6. The connecting rod 52 has four arc surfaces evenly distributed around the center line of the transverse rod 5. The length of the connecting rod 52 is basically the same as the length of the through hole 6.

[0038] When assembling the longitudinal bar 1 and the transverse bar 5, ensure that the same transverse bar 5 passes sequentially through the through holes 6 on the two parallel longitudinal bars 1, as shown below. Figure 8As shown. When the connecting rod 52 is located inside the through hole 6, the crossbar 5 is rotated 45 degrees relative to the vertical rod 1 about its own center line, so that the four arc surfaces of the connecting rod 52 contact the four inner surfaces of the through hole 6 and are in an interference fit. At the same time, the two sides of the slot 53 respectively lock the edges of the two ends of the through hole 6 to prevent the crossbar 5 from sliding relative to the vertical rod 1 along the length of the crossbar 5. Figure 9 , Figure 10 As described above. During the installation of the crossbar 5, the torque can be increased by rotating the crossbar body 51 with a wrench, making the installation more stable. In this embodiment, of the three crossbars 5, two are longer and the other is shorter, as shown... Figure 1 , Figure 2 As shown, the shorter crossbar 5 is positioned on the longitudinal bar 1 on the side near the bend 2.

[0039] The rotating splicing structure includes a plug shaft 4 and a sleeve 3. The sleeve 3 has plug holes 31 at the center of both its upper and lower ends. The plug shaft 4 is located at one end of the longitudinal rod 1 and at each connecting end of the bent portion 2. The side wall of the plug shaft 4 has at least two protrusions 41 arranged around its axis. In this embodiment, each plug shaft 4 has three protrusions 41. Each end of the sleeve 3 has three longitudinal grooves 32. The length of the longitudinal grooves 32 is parallel to the length of the sleeve 3. The longitudinal grooves 32 are located outside the plug holes 31 and are connected to them. The inner wall of the plug holes 31 of the sleeve 3 has a transverse groove 33, one end of which is connected to the longitudinal groove 32. Figure 11 and Figure 12 As shown. The insertion shaft 4 is longitudinally inserted into and rotated into the insertion hole 31, the protrusion 41 is longitudinally slidably engaged with the longitudinal slide groove 32, and the protrusion 41 is laterally slidably engaged with the transverse slide groove 33.

[0040] Simply replace the sleeve with one of different lengths, such as Figure 1 and Figure 6 As shown, the overall length of the core can be changed, thus allowing it to be used in flow channel sand cores of different lengths. Even if the diameter of the curved portion of the required flow channel sand core varies, only the curved portion 2 with different bending radii needs to be manufactured separately, reducing the production cost of the core.

[0041] During installation, insert the plug shafts 4 located on both sides of the sleeve 3 axially into the plug holes 31 of the sleeve 3, and simultaneously allow each protrusion 41 to slide into the longitudinal groove 32. When the protrusions 41 on the plug shafts 4 at both ends of the sleeve 3 have slid to one end of the transverse groove 33, rotate the sleeve 3 relative to the plug shafts 4 at both ends by a certain angle, so that the protrusions 41 are screwed into the transverse groove 33, thus completing the rotational connection between the sleeve 3 and the plug shafts 4.

[0042] At least one of the axial end faces of the transverse slide groove 33 is an inclined surface 34. The inclined surface 34 is not perpendicular to the axis of the sleeve 3. The inclined surface 34 causes the longitudinal width of the transverse slide groove 33 to gradually decrease from the end near the longitudinal slide groove 32 to the end away from the longitudinal slide groove 32. During the process of screwing the protrusion 41 of the insertion shaft 4 into the transverse slide groove 33, it is gradually axially pressed to prevent it from shaking.

[0043] The outer wall of the sleeve 3 is provided with a hexagonal protrusion 30, which can be clamped by a wrench and make the sleeve 3 rotate as a whole, making it convenient to tighten and loosen.

[0044] The bending section 2 includes a first bending rod 21 and a second bending rod 22, which are connected by at least two reinforcing rods 23. The two connecting ends of the bending section 2 are located at one end of the first bending rod 21 and the second bending rod 22, respectively.

[0045] Lifting lugs 7 are provided on one of the reinforcing rods 23 of the curved section 2 and on each longitudinal rod 1, such as Figure 1 and Figure 13 As shown. To facilitate the movement of the runner sand core, before casting, the lifting lugs 24 of the core skeleton inside the runner sand core are partially exposed and not covered with molding sand. The runner sand core containing the core skeleton is lifted and moved to the casting position by hooking the lifting lugs 24 with a crane, and then the lifting lugs 24 are partially covered with molding sand.

[0046] The present invention has been described above in conjunction with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations made in accordance with the essence of the present invention.

Claims

1. A core print for a pump body casting runner sand core, characterized by, It includes a curved section (2), longitudinal bars (1) and transverse bars (5). There are two longitudinal bars (1) that are parallel to each other, and there are at least two transverse bars (5) that are parallel to each other. Each of the two longitudinal bars (1) has at least two through holes (6) that pass through the longitudinal bars (1) laterally. The outer wall of the transverse bar (5) is provided with a slot (53). After the transverse bar (5) passes through the through holes (6) of the two longitudinal bars (1) at the same time, the transverse bar (5) rotates relative to the through holes (6) so that the slot (53) engages with the edge of the through hole (6). The same end of the curved section (2) is provided with two connecting ends. Each connecting end of the curved section (2) is connected to one end of each longitudinal bar (1) by a quick-release structure through a rotating splicing structure.

2. A core print for a sand core of a flow passage of a pump body casting according to claim 1, characterized in that, The through hole (6) of the longitudinal rod (1) has a polygonal cross-section. The horizontal rod (5) includes three horizontal rod bodies (51) and two connecting rods (52). The cross-section of the horizontal rod body (51) is polygonal and matches the cross-sectional shape of the through hole (6). Each connecting rod (52) is connected between two adjacent horizontal rod bodies (51). Each connecting rod (52) is arranged coaxially with the horizontal rod body (51). The outer side wall of the connecting rod (52) does not extend beyond the outer side wall of the horizontal rod body (51). The end edge corners of two adjacent horizontal rod bodies (51) and the outer side wall of the connecting rod (52) together form the slot (53).

3. A core print for a sand core of a flow passage of a pump body casting according to claim 1, wherein The rotating splicing structure includes a plug shaft (4) and a sleeve (3). The sleeve (3) has plug holes (31) at the middle of both ends. The plug shaft (4) is set on the end of the longitudinal rod (1) and each connecting end of the bent part (2). The side wall of the plug shaft (4) is provided with at least two protrusions (41) arranged around its axis. The end of the sleeve (3) is provided with a longitudinal groove (32). The longitudinal groove (32) is located outside the plug hole (31) and the two are connected. The inner wall of the plug hole (31) of the sleeve (3) is provided with a transverse groove (33) one end of which is connected to the longitudinal groove (32). The plug shaft (4) is longitudinally plugged into the plug hole (31) and rotated. The protrusions (41) are longitudinally slidably engaged with the longitudinal groove (32) and the transverse groove (33) are transversely slidably engaged with the transverse groove (33).

4. A core print for a sand core of a flow passage of a pump body casting according to claim 3, characterized in that At least one of the axial end faces of the transverse slide (33) is an inclined surface (34), which is not perpendicular to the axis of the sleeve (3). The inclined surface (34) causes the longitudinal width of the transverse slide (33) to gradually decrease from the end near the longitudinal slide (32) to the end away from the longitudinal slide (32).

5. A core print for a sand core of a flow passage of a pump body casting according to claim 3, wherein The sleeve (3) has a hexagonal protrusion (30) on its outer side wall.

6. A core print for a sand core of a flow passage of a pump body casting according to claim 1, wherein The bending section (2) includes a first bending rod (21) and a second bending rod (22), which are connected by at least two reinforcing rods (23); the two connecting ends of the bending section (2) are located at one end of the first bending rod (21) and the second bending rod (22), respectively.

7. A core print for a sand core of a flow channel of a pump body casting according to claim 6, characterized in that Both the curved part (2) and the longitudinal rod (1) are provided with lifting lugs (7).

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