Core pulling structure for spiral sand core

Abstract

The utility model discloses a core pulling structure for a spiral sand core, and belongs to the technical field of sand core casting. Comprising a movable mold, a fixed mold and a plurality of profiling modules, the movable mold and the fixed mold are used in cooperation, the profiling modules can penetrate through the fixed mold and abut against the periphery of the movable mold, and the core pulling structure comprises a horizontal workbench used for installing the fixed mold and a driving mechanism capable of driving the fixed mold to move from bottom to top to be matched with the fixed mold; wherein a plurality of core-pulling cylinders capable of respectively driving the profiling modules to move towards the fixed die are arranged on the horizontal workbench; the core-pulling structure for the spiral sand core can assist manual operation in accurately and stably performing core-pulling operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of sand core casting, and particularly relates to a core-pulling structure for spiral sand cores. Background Art

[0002] The spiral sand core is an internal support structure suitable for sand core casting, which can form an internal cavity or pipeline during the casting process, especially suitable for casting some oil pump products. The structural design of the spiral sand core needs to take into account the internal structure of the oil pump and the shape of the fluid channel to ensure that the sand core can completely cover and support the internal space of the oil pump without affecting the flow of the medium and the performance of the pump.

[0003] In the manufacture of spiral sand cores, the existing technology usually adopts manual operation to perform core pulling operations. However, for some sand cores with high precision requirements, manual operation efficiency is low and it is inevitable to cause damage to the sand core structure, resulting in a high scrap rate. Utility Model Content

[0004] The utility model aims to overcome the deficiencies in the prior art and to provide a spiral core pulling structure for sand cores, which can assist manual work in accurately and stably performing core pulling operations.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a core pulling structure for spiral sand cores, comprising a movable mold and a fixed mold for use in combination, and a plurality of profiling modules that can pass through the fixed mold and abut against the outer periphery of the movable mold, the core pulling structure comprising a horizontal workbench for mounting the fixed mold, and a driving mechanism that can drive the fixed mold to move from bottom to top to cooperate with the fixed mold;

[0006] Wherein, the horizontal workbench is provided with a plurality of core-pulling cylinders which can respectively drive the profiling modules to move toward the fixed mold.

[0007] Optionally, the driving mechanism includes a lifting platform and a base arranged in parallel with each other, and a group of side plates supported at the bottom of the horizontal workbench, and a driving member capable of driving the base to move horizontally, and the movable mold is arranged on the lifting platform;

[0008] Among them, a plurality of sets of hinge rods arranged in parallel are hinged between the lifting platform and the base, and the base is connected between a set of the side panels by sliding along the horizontal direction through a linear guide rail;

[0009] The side plate is provided with an L-shaped sliding groove, and the lifting platform is provided with a limiting sliding rod capable of sliding along the side wall of the L-shaped sliding groove.

[0010] Optionally, a bearing is provided on the outer peripheral sleeve of the limiting sliding rod.

[0011] Optionally, the L-shaped slide groove includes a first section arranged in the horizontal direction, a second section arranged obliquely upward, and a third section arranged vertically upward, and the first section, the second section, and the third section are connected in sequence and transition smoothly.

[0012] Optionally, the widths of the first section and the second section are both greater than the outer diameter of the bearing, and the width of the third section gradually decreases from one end connected to the second section to the end away from the second section, and the end is in a semicircular arc shape in which the bearing can be embedded.

[0013] Optionally, when the bearing is located in the first section, the hinge rod is inclined toward the direction of the second section and the third section.

[0014] Optionally, flanges are provided at the bottom of the movable mold and the fixed mold for detachable connection with the horizontal workbench or the lifting platform.

[0015] Optionally, one end of the first section away from the second section can extend outside the projection area of ​​the horizontal workbench.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] (1) When pulling the core, the profiling module can be pulled out from the fixed mold along a fixed track by the core pulling cylinder. At this time, the edge of the sand core corresponding to the profiling module abuts against the fixed mold and the movable mold, which can effectively prevent the edge of the sand core from falling off due to uneven force; at the same time, the pulling out of the profiling module can also expose part of the surface of the sand core to the air, avoiding the sand core from being unable to detach from the fixed mold due to excessive pressure; then, the movable mold is driven to be pulled out from the bottom of the fixed mold, and then the sand core is manually removed from the movable mold, so that the core pulling action can be completed efficiently and accurately, which can effectively reduce the scrap rate of sand core production;

[0018] (2) By driving the base to move horizontally through the driving part, the lifting platform can be driven to move horizontally and vertically along the L-shaped slide groove, which is convenient for the precise matching of the movable mold and the fixed mold. At the same time, the sand core that has completed cooling and solidification can be separated from the fixed mold and moved to a position convenient for manual operation to increase efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a structural schematic diagram of a core-pulling structure for a spiral sand core in a preferred embodiment of the utility model;

[0021] Figure 2 It is a side view structural schematic diagram of the core pulling structure for the spiral sand core in the preferred embodiment of the utility model;

[0022] Figure 3 It is a top view structural schematic diagram of the core pulling structure for the spiral sand core in the preferred embodiment of the utility model;

[0023] Figure 4 In the preferred embodiment of the utility model Figure 3 Schematic diagram of the cross-sectional structure at AA;

[0024] Figure 5 It is a schematic cross-sectional structure diagram of the core-pulling structure for the spiral sand core when the bearing is displaced to the first section in the preferred embodiment of the utility model;

[0025] Figure 6 It is a structural schematic diagram of a preferred embodiment of the utility model in which the lifting platform and the base are hinged together through a hinge rod;

[0026] Among them, 1. movable mold; 2. fixed mold; 3. profiling module; 4. horizontal workbench; 5. core-pulling cylinder; 6. lifting platform; 7. base; 8. side panel; 801. L-shaped slide; 8011. first section; 8012. second section; 8013. third section; 9. driving part; 10. hinge rod; 11. limit slide rod; 12. bearing; 13. flange. DETAILED DESCRIPTION

[0027] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0028] It should be noted that if there are directional indications (such as up, down, bottom, top, etc.) involved in this embodiment, the directional indication is only used to explain the relative position relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Unless otherwise clearly specified and defined, the terms "set", "connected", and "connected" 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0029] like Figure 1-Figure 6As shown, a core-pulling structure for a spiral sand core includes a movable mold 1 and a fixed mold 2 for use in conjunction with each other, and a plurality of profiling modules 3 that can pass through the fixed mold 2 and abut against the outer periphery of the movable mold 1. The core-pulling structure includes a horizontal workbench 4 for mounting the fixed mold 2, and a driving mechanism that can drive the fixed mold 2 to move from bottom to top to cooperate with the fixed mold 2; wherein, the horizontal workbench 4 is provided with a plurality of core-pulling cylinders 5 that can respectively drive the profiling modules 3 to move toward the fixed mold 2.

[0030] Specifically, the fixed mold 2 is provided with a cavity with an opening facing downward, a material injection port connected to the cavity, and a plurality of through holes corresponding to the profiling module 3. The through holes connect the cavity to the outside. The driving mechanism can drive the movable mold 1 to be embedded in the cavity from the bottom of the fixed mold 2, and the cavity is compressed to match the sand core through the movable mold 1. The core-pulling cylinder 5 drives the profiling module 3 to penetrate into the cavity from the through hole on the fixed mold 2 along a fixed trajectory and abut against the movable mold 1. While the profiling module 3 blocks the through hole, a section of it extending into the cavity forms a cavity matching the sand core with the cavity of the fixed mold 2 and the outer surface of the movable mold 1. In this technical solution, the material injection port can be connected to some equipment such as a core shooting machine and a sand shooting machine in the prior art. The core shooting machine, the sand shooting machine, etc. can fill the softened raw sand and adhesive into the cavity through the material injection port, and the raw sand and adhesive are cooled and solidified in the cavity to form a sand core.

[0031] When pulling the core, first pull the profiling module 3 out of the cavity of the fixed mold 2 through the core-pulling cylinder 5, so that part of the sand core is exposed to the air, so as to avoid the sand core being unable to be separated from the fixed mold 2 due to excessive pressure; then the movable mold 1 is driven to be pulled out from the bottom of the fixed mold 2, and then the sand core is manually removed from the movable mold 1 to complete the entire core pulling action. In this technical solution, the inner wall of the cavity of the fixed mold 2 and the outer surface of the fixed mold 2 are relatively smooth, and a sand core release agent can be manually applied so that the sand core can be separated from the cavity of the fixed mold 2 under the action of its own gravity.

[0032] The above, such as Figure 1 , Figure 5 , Figure 6 As shown, the driving mechanism includes a lifting platform 6 and a base 7 arranged in parallel with each other, a set of side plates 8 supported at the bottom of the horizontal workbench 4, and a driving member 9 capable of driving the base 7 to move horizontally. The movable mold 1 is arranged on the lifting platform 6. The driving member 9 is a high-precision mechanical device such as a cylinder, a servo slide, a screw slide, etc. for controlling and adjusting the precise position movement. Preferably, in this technical solution, the driving member 9 can select a pen cylinder;

[0033] Among them, a plurality of sets of hinge rods 10 arranged in parallel are hinged between the lifting platform 6 and the base 7. The base 7 is connected between a set of side plates 8 by sliding along a horizontal direction through a linear guide rail. Through the hinge rods 10, the lifting platform 6 can be turned over relative to the base 7.

[0034] An L-shaped slide groove 801 is provided on the side plate 8, and a limit slide bar 11 that can slide along the side wall of the L-shaped slide groove 801 is provided on the lifting platform 6, so that when the driving member 9 drives the base 7 to move in the horizontal direction, the lifting platform 6 can move along the L-shaped slide groove 801 through the limit slide bar 11, and its movement trajectory is limited by the L-shaped slide groove 801, thereby realizing the horizontal movement, vertical lifting and other actions of the lifting platform 6. At the same time, in order to reduce the resistance when the lifting platform 6 moves, the outer periphery of the limit slide bar 11 is provided with a bearing 12, and the bearing 12 is rollingly connected in the L-shaped slide groove 801.

[0035] Specifically, Figure 1 , Figure 2 As shown, the L-shaped chute 801 includes a first section 8011 arranged in the horizontal direction, a second section 8012 arranged obliquely upward, and a third section 8013 arranged vertically upward. The first section 8011, the second section 8012, and the third section 8013 are sequentially connected and smoothly transitioned. The second section 8012 can initially guide the lifting platform 6 to rise, avoiding the situation of jamming when the lifting platform 6 rises. At the same time, in order to further guide the lifting platform 6 to rise vertically along the third section 8013, as shown in FIG. Figure 5 As shown, when the bearing 12 is located in the first section 8011, the hinge rod 10 is tilted toward the second section 8012 and the third section 8013 to increase the slope of the hinge rod 10 when the bearing 12 passes through the second section 8012, thereby reducing the resistance of the lifting platform 6 to vertical lifting.

[0036] Furthermore, in order to improve the position accuracy of the movable mold 1 and the fixed mold 2 when they are matched, as Figure 2 , Figure 4 As shown, the width of the first section 8011 and the second section 8012 are both greater than the outer diameter of the bearing 12, and the width of the third section 8013 gradually decreases from the end connected to the second section 8012 to the end away from the second section 8012, and the end is in a semicircular arc shape that can be embedded with the bearing 12. When the bearing 12 moves to the end of the third section 8013, a part of the outer circumference of the bearing 12 can be completely embedded with the semicircular arc end, so that each lifting of the lifting platform 6 is limited to a fixed point, thereby ensuring the position accuracy of the movable mold 1 and the fixed mold 2.

[0037] In this embodiment, if Figure 1 , Figure 3 As shown, the bottom of the movable mold 1 and the fixed mold 2 are both provided with flanges 13 for detachably connecting with the horizontal workbench 4 or the lifting platform 6. In order to replace the movable mold 1 and the fixed mold 2 of different specifications and sizes, the diversity and practicality of the core pulling structure are increased.

[0038] Furthermore, one end of the first section 8011 away from the second section 8012 can extend outside the projection area of ​​the horizontal workbench 4, which can provide a larger operating space for the operator and facilitate the operator to remove the sand core from the fixed mold 2.

[0039] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A core pulling structure for a spiral sand core, comprising a movable mold (1) and a fixed mold (2) used in conjunction with each other, and a plurality of profiling modules (3) capable of passing through the fixed mold (2) and abutting against the outer periphery of the movable mold (1), characterized in that: The core-pulling structure comprises a horizontal workbench (4) for mounting the fixed die (2), and a driving mechanism capable of driving the fixed die (2) to move from bottom to top to cooperate with the fixed die (2); Wherein, a plurality of core-pulling cylinders (5) capable of respectively driving the profiling modules (3) to move toward the fixed mold (2) are arranged on the horizontal workbench (4).

2. The core-pulling structure for spiral sand cores according to claim 1, characterized in that: The driving mechanism comprises a lifting platform (6) and a base (7) arranged in parallel with each other, a group of side plates (8) supported at the bottom of the horizontal workbench (4), and a driving member (9) capable of driving the base (7) to move horizontally, and the movable mold (1) is arranged on the lifting platform (6); A plurality of sets of hinge rods (10) arranged in parallel are hingedly connected between the lifting platform (6) and the base (7); the base (7) is slidably connected between a set of side panels (8) in a horizontal direction via a linear guide rail; An L-shaped sliding groove (801) is provided on the side plate (8), and a limiting sliding rod (11) capable of sliding along the side wall of the L-shaped sliding groove (801) is provided on the lifting platform (6).

3. The core-pulling structure for spiral sand cores according to claim 2, characterized in that: A bearing (12) is sleeved on the outer periphery of the limiting sliding rod (11).

4. The core-pulling structure for spiral sand cores according to claim 3, characterized in that: The L-shaped slide groove (801) comprises a first section (8011) arranged in a horizontal direction, a second section (8012) arranged obliquely upward, and a third section (8013) arranged vertically upward, wherein the first section (8011), the second section (8012), and the third section (8013) are connected in sequence and smoothly transition.

5. The core-pulling structure for spiral sand cores according to claim 4, characterized in that: The widths of the first section (8011) and the second section (8012) are both greater than the outer diameter of the bearing (12), and the width of the third section (8013) gradually decreases from the end connected to the second section (8012) to the end away from the second section (8012), and the end is in the shape of a semicircle capable of embedding the bearing (12).

6. The core-pulling structure for spiral sand cores according to claim 4, characterized in that: Furthermore, when the bearing (12) is located in the first section (8011), the hinge rod (10) is inclined in the direction of the second section (8012) and the third section (8013).

7. The core-pulling structure for spiral sand cores according to claim 2, characterized in that: The bottoms of the movable mold (1) and the fixed mold (2) are both provided with flanges (13) for being detachably connected to the horizontal workbench (4) or the lifting platform (6).

8. The core-pulling structure for spiral sand cores according to claim 4, characterized in that: One end of the first section (8011) away from the second section (8012) can extend outside the projection area of ​​the horizontal workbench (4).

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