Pump body mold for preventing cold shut by using riser

Abstract

The utility model relates to the technical field of casting, and provides a pump body mould utilizing a riser to prevent cold shut, which comprises a mould plate, an upper mould sample, a straight pouring gate, a flange inner pouring gate, an arc inner pouring gate, the riser, a lower mould sample, a cross pouring gate, a positioning structure and a locking structure, the mould plate comprises a mould plate upper surface and a mould plate lower surface, the upper mould sample is arranged on the mould plate upper surface, and the straight pouring gate is arranged on the lower surface of the mould plate lower surface. The sprue is arranged at the central position of the upper surface of the template, and the two flange ingates are arranged at the middle position of the upper surface of the template. By arranging the risers, the characteristic that molten iron stored in the risers is relatively high in temperature and relatively slow in solidification relative to a casting is utilized; a dead head is additionally arranged at the position, far away from a small arc end flow gate, of each of two diagonal patterns prone to generating cold shut, molten iron with the high temperature is provided through the dead heads, the molten iron with the high temperature can be obtained at the position prone to cold shut, and therefore the probability of cold shut is reduced, and the rejection rate of cold shut can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a pump body mould which utilizes a riser to prevent cold shut. Background Art

[0002] A sewage pump is a mechanical device specially used to extract sewage from a sewage collection well and transport it to a sewer or treatment equipment. The pump body is a key part of a sewage pump, generally made of cast iron and sand casting. Its main function is to introduce the water after the impeller rotates at high speed into the water outlet pipe. It is a flow-through component, so there should be no leakage during the air tightness test.

[0003] At present, the production is carried out by using the Xindong automatic line wet mold clay sand machine molding, with 4 molds, the outlet ends are aligned in pairs, the middle is the straight runner, and the cross runner is set under the middle mold plate in the long direction. Each mold has an inner runner set at the outer circle of the flange and the arc near the end of the cross runner, and is connected to the cross runner. Since the product wall thickness is very thin, only 4mm, the large arc ends of the two diagonal molds with the inner runner set at the small arc are far away from the two inner gates, and the molten iron flows through a long path. As the temperature decreases, cold shut often occurs, resulting in the scrapping of the blank and a low pass rate. In view of this, this application is specially proposed. Utility Model Content

[0004] The present application proposes a pump body mold that uses a riser to prevent cold shut, so as to solve the technical problem that in the prior art, two large arc ends of the diagonal shapes of the ingates are set from the small arc. Because they are far away from the two ingates, the molten iron flows through a long path. As the temperature decreases, cold shut often occurs, resulting in the scrapping of the blank and a low pass rate. The above technical purpose of the utility model is achieved through the following technical solutions:

[0005] A pump body mold that uses a riser to prevent cold shut, includes a template, an upper pattern, a straight runner, an ingate at a flange, an ingate at an arc, a riser, a lower pattern, a cross runner, a positioning structure and a locking structure. The template includes a template top and a template bottom. The upper pattern is arranged on the template, the straight runner is arranged at the center position of the template, two ingates at the flange are arranged in the middle position of the template, two ingates at the arc are respectively located on both sides of the template, the straight runner is connected with the ingate at the flange and the ingate at the arc, the two risers are diagonally arranged on the template, the lower pattern is arranged below the template, the cross runner is arranged in the middle position below the template, the cross runner is connected with the straight runner, the number of the upper pattern and the number of the lower pattern are both four, the positioning structure is arranged on the template, and the locking structure is arranged at the edge of the template.

[0006] Preferably, the positioning structure includes a convex positioning member and a concave positioning member, the convex positioning member is arranged on the template, and the concave positioning member is arranged below the template, and the convex positioning member and the concave positioning member are in contact and fit.

[0007] Preferably, the locking structure comprises locking holes, and the locking holes are opened at the edge positions of the left and right sides of the template.

[0008] Preferably, threaded holes are provided at the middle positions of the upper and lower sides of the template.

[0009] Preferably, positioning holes are provided on both upper and lower sides of the bottom of the template.

[0010] Preferably, the number of the locking holes is six.

[0011] Preferably, the sprue is connected to a pouring cup of an automatic line molding machine.

[0012] Compared with the prior art, the beneficial effects of the present invention include:

[0013] The utility model arranges risers and utilizes the characteristic that the molten iron stored in the risers solidifies slowly compared with the temperature of the casting, and adds a riser to each of the two diagonal shapes away from the inner gate of the small arc end where cold shut is easy to occur, so that molten iron with higher temperature is provided through the risers, and the parts prone to cold shut can obtain molten iron with higher temperature, thereby reducing the probability of cold shut and further reducing the cold shut scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model template;

[0015] Figure 2 It is a schematic diagram of the structure below the template of the utility model;

[0016] Figure 3 It is a schematic diagram of the state of mold closing of the utility model;

[0017] Figure 4 It is a projection diagram of the utility model template;

[0018] Figure 5 It is a projection schematic diagram of the bottom of the template of the utility model.

[0019] In the figure: 1. mold plate; 2. upper pattern; 3. straight runner; 4. ingode at flange; 5. ingode at arc; 6. riser; 7. convex positioning; 8. locking hole; 9. threaded hole; 10. lower pattern; 11. horizontal runner; 12. positioning hole; 13. concave positioning. DETAILED DESCRIPTION

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0023] Please refer to the attached Figure 1-5 , a pump body mold using a riser 6 to prevent cold shut, including a mold plate 1, an upper mold 2, a sprue 3, an ingode 4 at a flange, an ingode 5 at an arc, a riser 6, a lower mold 10, a runner 11, a positioning structure and a locking structure, the mold plate 1 includes an upper mold plate 1 and a lower mold plate 1, the upper mold 2 is arranged on the mold plate 1, the sprue 3 is arranged at the center position on the mold plate 1, two ingodes 4 at flanges are arranged in the middle position on the mold plate 1, and two ingodes 5 at arcs are respectively located on both sides of the mold plate 1, the sprue 3 is connected with the ingode 4 at the flange and the ingode 5 at the arc, the sprue 3 is connected with the pouring cup of the automatic line molding machine, two risers 6 are diagonally arranged on the mold plate 1, the lower mold 10 is arranged under the mold plate 1, the runner 11 is arranged in the middle position under the mold plate 1, the runner 11 is connected with the sprue 3, the number of the upper mold 2 and the lower mold 10 is four, the positioning structure is arranged on the mold plate 1, and the locking structure is arranged at the edge of the mold plate 1.

[0024] Adopting the above technical scheme, the mold plate 1 is the main skeleton part of the mold, the four upper patterns 2 are the upper mold parts that form the blank, the straight runner 3 is connected to the pouring cup of the automatic molding machine, and is the channel for molten iron to enter during pouring. The ingates 4 at the two flanges and the ingates 5 at the two arcs respectively introduce the molten iron from the cross runner 11 into the mold cavity from the flanges and the arcs to form a blank. The two risers 6 respectively store high-temperature molten iron for use when the blank solidifies and cools, thereby preventing cold shuts from occurring at the large arcs. The four lower patterns 10 are the lower mold parts that form the blank, and the cross runner 11 is connected to the straight runner 3, and introduces the molten iron from the straight runner 3 into the ingates 4 at the two flanges and the ingates 5 at the two arcs.

[0025] In some embodiments, the positioning structure includes a convex positioning structure 7 and a concave positioning structure 13. The convex positioning structure 7 is arranged on the template 1, and the concave positioning structure 13 is arranged under the template 1. The convex positioning structure 7 and the concave positioning structure 13 are in contact and matched.

[0026] With the above technical solution, the two convex positioning 7 and the two concave positioning 13 are used to align the upper sand mold with the lower sand mold after molding, so as to prevent the upper sand box and the lower sand box from misaligning.

[0027] In some embodiments, the locking structure includes locking holes 8 , which are opened at the edge positions of the left and right sides of the template 1 , and the number of the locking holes 8 is six.

[0028] By adopting the above technical solution, after the mold is positioned, six bolts are respectively placed in the six locking holes 8 to lock the mold.

[0029] In some embodiments, threaded holes 9 are provided at the middle positions of the upper and lower sides of the template 1.

[0030] By adopting the above technical solution, when loading and unloading the mold, two eye bolts are screwed into the two threaded holes 9 respectively, so as to facilitate the insertion of the hook of the iron chain and lift the mold.

[0031] In some embodiments, positioning holes 12 are provided on both the upper and lower sides of the bottom of the template 1 .

[0032] By adopting the above technical solution, when installing the mold, the mold is positioned on the positioning pin on the mold frame by aligning the positioning hole 12 with the positioning pin on the mold frame.

[0033] Working method:

[0034] Step 1: At the mold placement location, use two eyebolts of corresponding specifications to tighten them into the two threaded holes 9 respectively, insert the hook of the iron chain, and fix it, and use the crane to lift the mold to the mold rack at the automatic line molding location;

[0035] Step 2: Align the two positioning holes 12 of the mold with the positioning pins on the mold frame to position the mold;

[0036] Step 3: Use six bolts of corresponding specifications to tighten them into the six locking holes 8 to fix the mold;

[0037] Step 4, start the automatic line molding machine to mold and core;

[0038] Step 5: Carry out preparation work before pouring. When the number of molds is enough for one bag, deliver a bag of molten iron and pour it into the ladle of the automatic pouring machine;

[0039] Step 6: Slowly pour the molten iron from the ladle into the pouring cup of the sand mold;

[0040] Step 7. At this time, the molten iron flows into the sprue 3 and the cross runner 11 through the pouring cup, and flows into the upper mold 2 and the lower mold 10 through the two flange ingates 4 and the two arc ingates 5 respectively, and flows into the two risers 6 through the two upper molds 2 at the diagonal positions.

[0041] Step 8, after pouring a box, the molten iron in the sand mold gradually solidifies, and the four upper molds 2 and the lower mold 10 with thinner walls solidify first. When the two upper molds 2 and the lower mold 10 at the diagonal angles solidify, they continuously absorb the two high-temperature molten irons. Because the high-temperature molten iron has good fluidity, this can prevent cold shut from occurring in the large arc part away from the inner runner 5 at the arc.

[0042] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. A pump body mold using a riser to prevent cold shut. It is characterized in that The invention comprises a mold plate (1), an upper mold (2), a sprue (3), an ingode (4) at a flange, an ingode (5) at an arc, a riser (6), a lower mold (10), a runner (11), a positioning structure and a locking structure. The mold plate (1) comprises an upper mold plate (1) and a lower mold plate (1). The upper mold (2) is arranged on the mold plate (1). The sprue (3) is arranged at a central position on the mold plate (1). The two ingodes (4) at the flange are arranged at a middle position on the mold plate (1). The two ingodes (5) at the arc are respectively located on the mold plate (1). At the upper two side positions, the sprue (3) is connected to the ingrow (4) at the flange and the ingrow (5) at the arc, the two risers (6) are diagonally arranged on the mold plate (1), the lower mold (10) is arranged below the mold plate (1), the cross runner (11) is arranged at the middle position below the mold plate (1), the cross runner (11) is connected to the sprue (3), the number of the upper mold (2) and the number of the lower mold (10) are both four, the positioning structure is arranged on the mold plate (1), and the locking structure is arranged at the edge of the mold plate (1).

2. A pump body mold using a riser to prevent cold shut according to claim 1, It is characterized in that The positioning structure comprises a convex positioning member (7) and a concave positioning member (13); the convex positioning member (7) is arranged on the top of the template (1), and the concave positioning member (13) is arranged below the template (1); the convex positioning member (7) and the concave positioning member (13) are in contact and fit.

3. A pump body mold using a riser to prevent cold shut according to claim 1, It is characterized in that The locking structure comprises a locking hole (8), wherein the locking hole (8) is provided at the edge positions of the left and right sides of the template (1).

4. A pump body mold using a riser to prevent cold shut according to claim 1, It is characterized in that The template (1) is provided with threaded holes (9) at the middle positions of the upper and lower sides.

5. A pump body mold using a riser to prevent cold shut according to claim 1, It is characterized in that Positioning holes (12) are provided on both upper and lower sides of the bottom of the template (1).

6. A pump body mold using a riser to prevent cold shut according to claim 3, It is characterized in that The number of the locking holes (8) is six.

7. A pump body mold using a riser to prevent cold shut according to claim 1, It is characterized in that The sprue (3) is connected to a pouring cup of an automatic line molding machine.

Images