Sand core structure of engine body

Abstract

The utility model provides an engine body sand core structure which comprises a main body core and a truss core, the truss core is provided with a first connecting groove and / or a first connecting part along the height direction of the truss core, and the main body core is provided with a second connecting part and / or a second connecting groove; the first connecting groove and the second connecting part are matched in an inserted mode and fixed in an adhesive mode, and the first connecting part and the second connecting groove are matched in an inserted mode and fixed in an adhesive mode. According to the sand core structure of the engine body, overall core assembly of the truss core is achieved in a core assembly mode, the long and narrow truss core is accurately and stably assembled to the main body core in an insertion and rapid bonding assembly mode, and the truss core is accurately and stably fixed to the main body core in a standing state; and the truss core can turn over by 360 degrees along with the main body core, and does not fall off after long-distance turnover.

Description

Technical Field

[0001] The utility model relates to the technical field of engine body design and assembly, in particular to an engine body sand core structure. Background Art

[0002] At present, truss structures are designed on both sides of the heavy-duty engine body to ensure oil return from the cylinder head while enhancing the body rigidity and suppressing torsional deformation. However, due to the constraints of the engine structure, the truss cavity is generally a narrow and long structure. In addition, due to the constraints of the weight of the whole machine, the overall wall thickness of the truss cavity is relatively thin, and the assembly and fixation of the truss core become technical difficulties. The core assembly positioning deviation of the truss core has a great influence on the wall thickness of the casting.

[0003] At present, the large cylinder core of the cylinder block in the foundry workshop is made by the core making center, and then the robot takes out the core, assembles the core as a whole, dips and dries the core as a whole, realizing an efficient production method of the whole process automated assembly line, and putting forward high requirements on the production efficiency of the production site.

[0004] Therefore, on the basis of ensuring the existing production mode, it is particularly important to realize the overall core assembly and sand core fixation of the truss core structure body. Utility Model Content

[0005] In order to overcome the deficiencies in the prior art, the main purpose of the utility model is to provide an engine body sand core structure, which adopts a core assembly method to realize the overall core assembly of the truss core, and adopts an assembly method of plug-in + quick bonding to accurately and stably assemble the narrow and long truss core to the main body core, and accurately and stably fix it on the main body core in a standing state, so that the truss core can be flipped 360° with the main body core and circulate over long distances without falling.

[0006] In order to achieve the above-mentioned object, the utility model provides an engine body sand core structure, which comprises a main body core and a truss core, wherein the truss core is provided with a first connecting groove and / or a first connecting portion along its height direction, and the main body core is provided with a second connecting portion and / or a second connecting groove;

[0007] The first connecting groove and the second connecting portion are plugged together and bonded together, and the first connecting portion and the second connecting groove are plugged together and bonded together.

[0008] Furthermore, at least one first accommodating groove connected to the first connecting groove is provided on the groove wall of the first connecting groove for storing hot melt adhesive.

[0009] Furthermore, the first accommodating groove is arranged at the bottom of the first connecting groove.

[0010] Furthermore, at least one second accommodating groove connected to the second connecting groove is provided on the groove wall of the second connecting groove for storing hot melt adhesive.

[0011] Furthermore, the second accommodating groove is arranged at the bottom of the second connecting groove.

[0012] Furthermore, a first adhesive layer is covered on the groove wall of the first connecting groove and / or the outer surface of the second connecting portion.

[0013] Furthermore, a second adhesive layer is covered on the groove wall of the second connecting groove and / or the outer surface of the first connecting portion.

[0014] Further, the shape of the first connecting portion includes a truncated cone;

[0015] The second connection portion has a shape including a truncated cone.

[0016] Furthermore, it also includes an upper cover core, which is arranged at the upper end of the main body core along the height direction of the main body core, and the top end of the truss core is plug-fitted with the upper cover core.

[0017] Furthermore, a buckle groove is provided on the upper cover core, and the top end of the truss core is inserted into the buckle groove.

[0018] Advantages of this utility model:

[0019] 1. The utility model solves the drawbacks of the traditional molding line lower core and the variability of the truss core, and realizes the overall core assembly and dip coating of the truss core, which is of great significance for ensuring the overall accuracy of the casting. The structure and solution have strong practicality and promotion value.

[0020] 2. The assembly method of plug-in + quick bonding is adopted to accurately and stably assemble the narrow and long truss core to the main body core, and accurately and stably fix it on the main body core in a standing state, so that the truss core can be turned 360° with the main body core and can be rotated over long distances without falling.

[0021] 3. By setting the core assembly method, the truss core can be assembled as a whole to avoid the core under the modeling line, which affects the production rhythm.

[0022] 4. By using hot melt glue gun, the disadvantages of traditional hot melt glue machine such as high power consumption, large space occupation and low safety can be improved.

[0023] 5. Through the alternating action of hot melt glue and adhesive, the instantaneous strength and long-term strength are combined according to the core group, so that the core group can meet the fixing requirements of the truss core in different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those skilled in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. In the accompanying drawings:

[0025] Figure 1 A structural schematic diagram of the engine body sand core structure in the embodiment provided by the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the upper cover core and the main body core when they are assembled in the embodiment provided by the utility model;

[0027] Figure 3 A schematic diagram of the structure when the first connecting portion of the truss core and the second connecting groove of the main body core are matched and connected in the embodiment provided by the utility model;

[0028] Figure 4 This is a structural schematic diagram of the first connecting groove of the truss core and the first connecting groove of the main body core in the embodiment provided by the utility model when they are matched and connected.

[0029] In the figure:

[0030] 1. truss core; 11. first connecting groove; 111. first accommodating groove; 12. first connecting portion;

[0031] 2. Main body core; 21. Second connecting portion; 22. Second connecting groove; 221. Second containing groove;

[0032] 3. Upper cover core; 31. Buckle slot. DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0034] Sand core: It is generally made of casting sand, molding sand binder and auxiliary materials mixed in a certain proportion. It has a certain size, strength, and disintegrability. It is mainly used to form the inner cavity of the casting, various molding holes and parts of the shape that are difficult to demold.

[0035] Core assembly: On the ground or on a core assembly jig, use tightening bolts or other methods to assemble multiple sand cores together.

[0036] Core pack: Multiple sand cores connected together by tightening bolts or other methods. Different engine bodies have different core pack lengths, and the types and quantities of sand cores contained in the core pack are also different.

[0037] Core assembly jig: A device used to combine and assemble sand cores in sand casting.

[0038] The traditional core assembly method has at least the following shortcomings:

[0039] Due to the limitation of the main core structure, the truss core cannot adopt an inserted core head to achieve effective fixation of the truss core, so the overall core group dip coating cannot be achieved.

[0040] The truss core has a slender structure. In order to prevent the sand core from deforming, a special core frame needs to be made during the truss core dipping, drying, transportation and storage processes, which results in a high production cost.

[0041] Since the truss core cannot be dip-coated as a whole, the bottom truss core must be placed on the molding line first, followed by the main core assembly, and finally the upper truss core, resulting in many molding line processes and low production efficiency.

[0042] The complex core head plug-in matching method places high demands on the quality of the sand core, and correspondingly puts higher requirements on tooling production and daily tooling maintenance, resulting in high manufacturing and labor costs.

[0043] For a heavy truss core, the strength of the plug-in core head alone cannot ensure that the truss core can be firmly fixed on the core group during the core group flipping process.

[0044] Traditional sand core rapid curing methods mostly use hot melt machines, which have certain requirements for the working space and need to be preheated in advance when used. The energy consumption is high, and the temperature outside the hot melt adhesive box is high, so safety protection is required.

[0045] In view of this, the utility model provides an engine body sand core structure.

[0046] Among them, different core assembly processes are designed according to the sand core arrangements of the upper, middle and lower parts of the truss core 1. The overall core assembly and dip coating of the truss core 1 are achieved through the core head structure and assembly method of the truss core 1 with bottom plug-in + quick bonding, middle plug-in + quick bonding and top inverted. While ensuring the product accuracy, it is convenient for operators to operate, improve efficiency, reduce costs, and improve the labor intensity of workers.

[0047] like Figure 1 As shown, the engine body sand core structure includes a main body core 2 and a truss core 1. The truss core 1 and the main body core 2 are assembled by plug-in assembly and quick bonding and fixing, so that the narrow and long truss core 1 is accurately and stably assembled on the main body core 2, and is accurately and stably bonded and fixed on the main body core 2 in a standing state, so that the truss core 1 can be turned 360° with the main body core 2 and rotated over a long distance without falling.

[0048] In some embodiments of the present invention, the truss core 1 is provided with a first connection groove 11 and a first connection portion 12 along its height direction, and the main body core 2 is correspondingly provided with a second connection portion 21 and a second connection groove 22 .

[0049] In some embodiments of the present invention, the truss core 1 is provided with a first connection groove 11 along its height direction, and the main body core 2 is correspondingly provided with a second connection portion 21 .

[0050] In some embodiments of the present invention, the truss core 1 is provided with a first connecting portion 12 along its height direction, and the main body core 2 is correspondingly provided with a second connecting groove 22 .

[0051] The first connection groove 11 and the second connection portion 21 are plug-fitted and bonded together.

[0052] The first connection portion 12 and the second connection groove 22 are plug-fitted and bonded to each other.

[0053] In the embodiment of the present invention, the shape of the first connection portion 12 includes a truncated cone, and the shape of the second connection groove 22 is adapted to and plug-fits with the shape of the first connection portion 12 .

[0054] Exemplarily, the first connection portion 12 and the second connection groove 22 are both truncated cone shaped.

[0055] In the embodiment of the present invention, the shape of the second connection portion 21 includes a truncated cone, and the shape of the second connection portion 21 is adapted to and plug-fits with the shape of the first connection groove 11 .

[0056] Exemplarily, the second connection portion 21 and the first connection groove 11 are both in the shape of a truncated cone.

[0057] like Figure 3 As shown, at least one first containing groove 111 communicating with the first connecting groove 11 is provided in the first connecting groove 11 , and the first containing groove 111 is used for storing hot melt adhesive.

[0058] In the utility model, hot melt adhesive can be placed in the first receiving groove 111 before assembly, and the upper cover core 3 is buckled after the hot melt adhesive solidifies. At this time, the truss core 1 and the main body core 2 already have instantaneous assembly strength, and then the whole is dipped and dried.

[0059] In the embodiment of the utility model, a hot melt glue gun is used to fill the first receiving groove 111 with hot melt glue, thereby improving the disadvantages of the traditional hot melt glue machine such as high power consumption, large space occupation and low safety.

[0060] like Figure 3 As shown, the first receiving groove 111 can be disposed at the bottom of the first connecting groove 11 .

[0061] Of course, the location of the first receiving groove 111 can be selected according to actual conditions and is not specifically limited.

[0062] In the embodiment of the present invention, the shape of the first receiving groove 111 includes a cylindrical shape.

[0063] Exemplarily, a cylindrical first receiving groove 111 is provided at the groove bottom of the first connecting groove 11 .

[0064] like Figure 2 As shown, at least one second containing groove 221 communicating with the second connecting groove 22 is defined in the second connecting groove 22 , and the second containing groove 221 is used for storing hot melt adhesive.

[0065] In the utility model, hot melt adhesive can be placed in the second receiving groove 221 before assembly, and the upper cover core 3 is buckled after the hot melt adhesive solidifies. At this time, the truss core 1 and the main body core 2 already have instantaneous assembly strength, and then the whole is dipped and dried.

[0066] In the embodiment of the utility model, by using a hot melt glue gun to fill the second receiving groove 221 with hot melt glue, the disadvantages of the traditional hot melt glue machine such as high power consumption, large space occupation and low safety are improved.

[0067] like Figure 2 As shown, the second accommodating groove 221 can be disposed at the bottom of the second connecting groove 22 .

[0068] Of course, the location of the second receiving groove 221 can be selected according to actual conditions and is not specifically limited.

[0069] In the embodiment of the present invention, the shape of the second receiving groove 221 includes a cylindrical shape.

[0070] Exemplarily, a cylindrical second accommodating groove 221 is provided at the groove bottom of the second connecting groove 22 .

[0071] In some embodiments of the present invention, the groove wall of the first connecting groove 11 and the outer surface of the second connecting portion 21 are both covered with a first adhesive layer.

[0072] In some embodiments of the present invention, the groove wall of the first connecting groove 11 is covered with a first adhesive layer.

[0073] In some embodiments of the present invention, the outer side of the second connecting portion 21 is covered with a first adhesive layer.

[0074] In some embodiments of the present invention, the groove wall of the second connecting groove 22 and the outer surface of the first connecting portion 12 are both covered with a second adhesive layer.

[0075] In some embodiments of the present invention, the groove wall of the second connecting groove 22 is covered with a second adhesive layer.

[0076] In some embodiments of the present invention, the outer side of the first connecting portion 12 is covered with a second adhesive layer.

[0077] In the present invention, the instantaneous strength and the long-term strength can be combined according to the core group through the alternating action of the hot melt adhesive and the adhesive layer, so that the core group can meet the fixing requirements of the truss core 1 in different application scenarios.

[0078] It is worth mentioning that the hot melt adhesive and the adhesive layer can be set according to actual needs. The two can be set separately or at the same time to play an alternating role.

[0079] The hot melt adhesive used in the utility model is a conventional hot melt adhesive in the art, and the adhesive used is also a conventional adhesive in the art.

[0080] like Figure 1 As shown, the engine body sand core structure also includes an upper cover core 3, which is arranged at the upper end of the main body core 2 along the height direction of the main body core 2, and the top end of the truss core 1 is plugged into and matched with the upper cover core 3.

[0081] In the embodiment of the utility model, a buckle groove 31 is formed on the upper cover core 3, and the top end of the truss core 1 is inserted into the buckle groove 31 to form a fitting connection.

[0082] The assembly process of the engine body sand core structure in the utility model is as follows:

[0083] The main body core 2 is placed on the pre-assembled core tray, and the operator uses a glue gun to apply hot melt glue to the glue grooves (the first accommodating groove 111 and the second accommodating groove 221), and then applies adhesive on the groove walls of the first connecting groove 11 and the second connecting groove 22 to form an adhesive layer;

[0084] Then quickly assemble the truss core 1 onto the main body core 2 and press for a moment;

[0085] After the hot melt adhesive solidifies, the upper cover core 3 is buckled on. At this time, the truss core 1 and the main body core 2 have instantaneous assembly strength, and then the whole is dipped and dried.

[0086] In the utility model, a core head structure and an assembly method of a truss core 1 of bottom plugging + quick bonding or bottom quick bonding, middle plugging + quick bonding, and top inversion are adopted to realize constraints in six directions at three positions of upper, middle, and lower, and the narrow and long truss core 1 can be accurately and stably assembled to the main body core 2. The quick bonding process can accurately and stably fix the narrow and long truss core 1 in a standing state on the main body core 2 on the basis of a simple core head, so that the truss core 1 can be turned 360 degrees with the main body core 2 and can be rotated over long distances without falling.

[0087] It should be noted that the term "comprises" and any variations thereof in the specification and claims of the present invention are intended to cover non-exclusive inclusions. For example, the inclusion of a series of components is not necessarily limited to those components explicitly listed, but may include other components that are not explicitly listed or inherent to the components.

[0088] In the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", "top", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have specific directions, or to be constructed and operated in specific directions.

[0089] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0090] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0091] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0092] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An engine body sand core structure, It is characterized in that It comprises a main body core and a truss core, wherein the truss core is provided with a first connection groove and / or a first connection portion along its height direction, and the main body core is provided with a second connection portion and / or a second connection groove; The first connecting groove and the second connecting portion are plugged together and bonded together, and the first connecting portion and the second connecting groove are plugged together and bonded together.

2. The engine body sand core structure according to claim 1, It is characterized in that At least one first accommodating groove connected to the first connecting groove is provided on the groove wall of the first connecting groove for storing hot melt adhesive.

3. The engine body sand core structure as claimed in claim 2, It is characterized in that The first accommodating groove is arranged at the bottom of the first connecting groove.

4. The engine body sand core structure according to claim 1, It is characterized in that At least one second accommodating groove communicating with the second connecting groove is formed on the groove wall of the second connecting groove and is used for storing hot melt adhesive.

5. The engine body sand core structure as claimed in claim 4, It is characterized in that The second accommodating groove is arranged at the groove bottom of the second connecting groove.

6. The engine body sand core structure according to claim 1, It is characterized in that The groove wall of the first connecting groove and / or the outer surface of the second connecting portion are covered with a first adhesive layer.

7. The engine body sand core structure according to claim 1, It is characterized in that A second adhesive layer is covered on the groove wall of the second connecting groove and / or the outer surface of the first connecting portion.

8. The engine body sand core structure according to claim 1, It is characterized in that The shape of the first connecting portion includes a truncated cone; The second connection portion has a shape including a truncated cone.

9. The engine body sand core structure according to claim 1, It is characterized in that It also includes an upper cover core, which is arranged at the upper end of the main body core along the height direction of the main body core, and the top end of the truss core is plug-fitted with the upper cover core.

10. The engine body sand core structure according to claim 9, It is characterized in that The upper cover core is provided with a buckle groove, and the top end of the truss core is inserted into the buckle groove.

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