Water gap rod, molding equipment and water gap forming method

Abstract

The invention provides a water gap rod, molding equipment and a water gap forming method, the water gap rod comprises at least two water gap sections, the water gap sections are sequentially connected in a nested mode in the axial direction, and the water gap sections can relatively move in the axial direction so that the water gap rod can stretch out and draw back along the axis; the gate rod is configured to be locked in a contraction state through at least one of an internally-arranged locking structure and an externally-arranged locking device, so that the gate rod is prevented from stretching and resetting in the process of being away from the mold. During box closing, the water gap rod is in contact with the mold, and the water gap section is stressed and contracted, so that the size is compressed to the height size matched with a water gap to be manufactured; during demolding, the water gap rod at the moment is locked through the locking structure or the locking device, so that the size change of the water gap rod is avoided, the water gap rod does not reset and extend after leaving the mold, the water gap is prevented from being damaged by the extending water gap section in the demolding process, and the water gap rod is beneficial to reducing the risk of water gap damage during demolding. The invention relates to the field of molding sand molding.

Description

Technical Field

[0001] The present application relates to the field of sand molding, and in particular to a nozzle rod, molding equipment and a nozzle molding method. Background Art

[0002] The nozzle rod is used to define the nozzle of the mold when making sand molds. In order to adapt to the nozzle shapes with different height dimensions, a multi-section nozzle rod with a spring is used in the related technology. During sand molding, the lower end of the nozzle rod is close to and abuts against the mold set in the sand box, and is pushed by the mold to shrink to an appropriate length. The compacted molding sand surrounds the nozzle rod to form the nozzle of the sand mold.

[0003] However, when the molding is completed and the mold is demolded, the nozzle rod using a multi-section scheme will be reset during the separation process. If the shape design of the nozzle rod is defective, the part that extends during the reset process will easily squeeze and scratch the molding sand on the surface of the nozzle, causing damage or even destruction of the nozzle. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a nozzle rod, a molding device and a nozzle molding method, wherein the nozzle rod helps to reduce the risk of nozzle damage during demoulding.

[0005] The nozzle rod provided in the present application includes at least two nozzle segments, which are nested and connected in sequence along the axial direction. The nozzle segments can move relative to each other in the axial direction to allow the nozzle rod to extend and retract along the axis. The nozzle rod is configured to be locked in a contracted state by at least one of an internally arranged locking structure and an externally arranged locking device to avoid the nozzle rod from stretching and resetting in the process of moving away from the mold.

[0006] The nozzle rod provided in the present application has at least the following technical effects: when the mold is closed, the nozzle rod contacts the mold, and the nozzle section is forced to shrink, thereby compressing the size to a height size that matches the nozzle to be produced; when demolding, the nozzle rod is locked at this time by a locking structure or a locking device, thereby preventing the size of the nozzle rod from changing, so that the nozzle rod does not reset and elongate after leaving the mold, avoiding the nozzle section that extends out during the demolding process from damaging the nozzle. The nozzle rod helps to reduce the risk of nozzle damage during demolding.

[0007] According to some embodiments of the present application, a chamber is formed inside the water nozzle section, and the chambers are interconnected. The water nozzle rod is locked by a locking device, and the locking device includes a medium supply assembly. The chamber is used to connect to the medium supply assembly, and the medium supply assembly is used to control the pressure of the chamber so that the water nozzle rod is locked in a contracted state.

[0008] According to some embodiments of the present application, the medium supply assembly is used to provide a pressure medium, the pressure medium is a gas, and the medium supply assembly includes an air pump and a gas distribution valve.

[0009] According to some embodiments of the present application, a sealing structure is provided at the connection portion of each nozzle section.

[0010] According to some embodiments of the present application, the medium supply assembly is used to generate positive pressure so that the nozzle rod abuts against the mold.

[0011] The molding equipment provided in the present application includes an upper pressing plate and a nozzle rod provided in the present application, and the nozzle rod is arranged on the upper pressing plate.

[0012] According to some embodiments of the present application, the molding equipment further includes a medium supply assembly, the upper pressure plate is formed with a first air distribution channel, the first air distribution channel is connected to the chamber of the nozzle section, and the first air distribution channel is connected to the medium supply assembly.

[0013] According to some embodiments of the present application, the molding equipment includes a connecting block, the upper pressure plate is provided with a mounting hole, the connecting block is arranged in the mounting hole, the nozzle rod is arranged on the connecting block, and the connecting block is formed with a second air distribution channel, one end of the second air distribution channel is connected to the first air distribution channel, and the other end of the second air distribution channel is connected to the chamber.

[0014] The nozzle forming method provided in the present application includes: locking the contracted state of the nozzle rod during the demoulding stage.

[0015] According to some embodiments of the present application, the nozzle forming method includes: in the closing and compacting stages, controlling the pressure medium in the nozzle rod to be at a first pressure to resist the external force of the molding sand and maintain the nozzle rod in contact with the mold; in the demolding stage, controlling the pressure medium in the nozzle rod to be at a second pressure to lock the contracted state of the nozzle rod.

[0016] The molding equipment provided in the present application includes the nozzle rod provided in the present application, and the nozzle forming method provided in the present application can be implemented based on the nozzle rod provided in the present application. Therefore, the molding equipment and the nozzle forming method correspondingly have the beneficial effects provided by the nozzle rod, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide further understanding of the technical solution disclosed in the present application and constitute a part of the specification. Together with the embodiments disclosed in the present application, they are used to explain the technical solution disclosed in the present application and do not constitute a limitation on the technical solution disclosed in the present application.

[0018] Figure 1 It is a structural schematic diagram of a nozzle rod according to an embodiment of the present application;

[0019] Figure 2 is a schematic diagram of the process of the nozzle rod of the embodiment of the present application being used for molding, wherein the nozzle rod is shown to be compressed during the closing process;

[0020] Figure 3 is a schematic diagram of the process of the nozzle rod of the embodiment of the present application when used for molding, wherein the nozzle rod is shown in a state where it is compressed into place;

[0021] Figure 4 is a schematic diagram of the process of the nozzle rod of the embodiment of the present application when used for molding, wherein it is shown that the nozzle rod is locked in a telescopic state after the mold is removed;

[0022] Figure 5 It is a structural schematic diagram of an upper pressing plate of an embodiment of the present application;

[0023] Figure 6 It is a structural schematic diagram of an embodiment of the present application in which the nozzle rod is installed on the upper pressure plate through a connecting block.

[0024] Reference numerals:

[0025] The nozzle rod 100, the nozzle section 110, the first limiting step 111, the second limiting step 112, the sealing groove 113, the chamber 120, and the sealing ring 130;

[0026] Upper pressing plate 200, first gas distribution channel 210;

[0027] Connecting block 300, second gas distribution channel 310;

[0028] The mold 400 and the lower pressing plate 500 . DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0030] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0034] In the related art, spring-retractable nozzle rods are commonly used in sand mold molding. In the process of compacting the molding sand and making the sand mold using the mold, sand box and pressure plate, the nozzle rod can shrink under the force of the mold to adapt to different nozzle sizes.

[0035] However, during the demoulding process, the mold needs to be removed. When the mold is removed, the nozzle rod will extend and reset. This process may scratch and squeeze the surrounding molding sand, causing damage to the nozzle of the sand mold. (The nozzle rod is fixed to the upper pressure plate and is not removed with the mold)

[0036] For this purpose, refer to Figure 1 According to the embodiment of the present application, the nozzle rod 100 includes at least two nozzle sections 110, which are nested and connected in sequence along the axial direction. The nozzle sections 110 can move relative to each other in the axial direction so that the nozzle rod 100 can be extended and retracted along the axis. The nozzle rod 100 is configured to be locked in a contracted state to prevent the nozzle rod 100 from stretching and resetting in the process of moving away from the mold.

[0037] Reference Figure 2 , Figure 3 and Figure 4 ,exist Figure 2 , Figure 3As shown, during the process of closing and compacting, the nozzle rod 100 contacts the mold 400, and the nozzle section 110 is forced to shrink, thereby compressing the size to a height size that matches the nozzle to be made; Figure 4 In the demoulding process shown, the nozzle rod 100 is locked at this time by a locking structure or a locking device, so as to prevent the size of the nozzle rod 100 from changing, so that the nozzle rod 100 does not reset and elongate after leaving the mold 400, and the nozzle section 110 extending out during the demoulding process is prevented from damaging the nozzle. The nozzle rod 100 helps to reduce the risk of nozzle damage during demoulding.

[0038] The present application also provides a molding device, referring to Figure 5 and Figure 6 The molding device includes an upper pressing plate 200 and a nozzle rod 100 of the present application, and the nozzle rod 100 is installed on the upper pressing plate 200.

[0039] The molding device includes the nozzle rod 100, and thus has corresponding beneficial effects provided by the nozzle rod 100, which will not be described in detail here.

[0040] It can be understood that during molding, the molding sand is compacted by bringing the upper pressure plate 200 and the lower pressure plate 500 closer to each other, the water outlet is limited by the sprue rod 100, and the basic structure of the molding equipment and the basic molding process can refer to the existing related technology. The drawings of this application only schematically show part of the structure of the molding equipment, which will not be repeated here.

[0041] Since the sand mold may have two or more nozzle length specifications, the nozzle rod 100 may have one or more contracted states. In some embodiments, the nozzle rod 100 may be locked by at least one of an internally disposed locking structure and an externally disposed locking device.

[0042] For example, in some embodiments, locking is achieved using a locking structure, which is a spring pin. The spring pin is arranged on one of two adjacent sprue sections 110, and a positioning hole is correspondingly provided in the other sprue section 110. When the sprue rod 100 is compressed to a set length, the positioning hole is aligned with the spring pin, and the spring pin extends into the positioning hole, thereby locking the relative positions of the two sprue sections 110 through a concave-convex fitting relationship.

[0043] Of course, in addition to the spring pin, the locking structure may also adopt other types of designs with concave-convex matching positioning functions, which will not be described in detail here.

[0044] However, generally speaking, the locking structure can only lock the nozzle rod 100 at a specific length, and when locked, the raised portion (such as the spring pin) is radially engaged with the recessed portion (such as the positioning hole) of the nozzle rod 100, and the spring pin cannot be exposed from the nozzle rod 100. Therefore, a certain radial space needs to be reserved inside the nozzle rod 100. The spring pin will also be subjected to shear force, so there are certain requirements for the performance and size of the spring pin. It may be difficult to implement when the available space in the nozzle rod 100 is small (such as a relatively slender nozzle rod 100).

[0045] To this end, in other embodiments, the molding device includes a locking device (not shown in the figures), and the nozzle rod 100 is locked by the locking device.

[0046] Specifically, in some embodiments, a chamber 120 is formed inside the nozzle section 110, and each chamber 120 is interconnected. The locking device includes a medium supply assembly, which is used to control the pressure of the chamber 120 to lock the nozzle rod 100 in a contracted state.

[0047] That is, the medium supply component generates a force to shrink the nozzle rod 100 by changing the pressure of the chamber 120 (usually forming a negative pressure), thereby overcoming the force to extend the nozzle rod 100 (such as the gravity of the nozzle rod 100 itself), and keeping the nozzle rod 100 away from the mold 400 in a contracted state. (The nozzle rod shrinks because the air in the chamber is compressed and discharged after contact with the mold, and the nozzle rod is extended by inflation to positive pressure. There is no spring inside the inflatable nozzle rod, and its own weight is supported by the negative pressure of the chamber after compression and the compaction of the sand mold to ensure that it will not fall.)

[0048] The chamber 120 may be constructed in different ways, and the chambers 120 of different nozzle sections 110 may be different. Figure 1 The nozzle rod 100 is divided into three nozzle sections 110. According to the distance from the upper pressure plate 200, the nozzle section 110 can be divided into a tail section, a middle section and a head section from near to far. The tail section is arranged on the upper pressure plate 200, and the cavity 120 of the tail section axially penetrates the tail section. The middle section is inserted in the cavity 120 of the tail section, and the cavity 120 of the middle section also axially penetrates the middle section, thereby connecting with the cavity 120 of the tail section. The head section is used to abut the mold 400, and the head section is inserted in the cavity 120 of the middle section. The cavity 120 of the head section is open on the side close to the upper pressure plate 200, thereby connecting with the cavity 120 of the middle section.

[0049] In addition, the outer surface of the tail section may be designed with an angle, for example, a 16° angle, to facilitate demoulding of the nozzle rod 100.

[0050] In some embodiments, the media supply assembly may also be used to generate positive pressure to force the nozzle bar 100 to abut against the mold 400 .

[0051] That is, the medium supply assembly can extend and retract the nozzle rod 100 by controlling the pressure of the chamber 120. During the closing and compacting process, the chamber 120 is under positive pressure, pushing the nozzle sections 110 away from each other, so that the nozzle rod 100 extends to abut the mold 400, while ensuring that the nozzle rod 100 will not retract under the force of the molding sand; during the demoulding process, the chamber 120 becomes under negative pressure, thereby ensuring that the nozzle rod 100 will not extend.

[0052] At this time, since the expansion and contraction is achieved by the pressure medium provided by the medium supply assembly, the nozzle rod 100 may not be provided with a spring, which also helps to simplify the structural design of the nozzle rod 100.

[0053] It is understandable that the pressure medium refers to a liquid or gaseous medium that has fluidity and can transmit pressure changes. In order to reduce the risk of contaminating the sand mold, in some embodiments, the pressure medium is gas, and the medium supply assembly includes an air pump and an air distribution valve.

[0054] In order to ensure the pressure stability in the chamber 120 , in some embodiments, a sealing structure is provided at the connection portion of each nozzle section 110 .

[0055] For example, refer to Figure 1 In some embodiments, the nozzle section 110 is provided with a sealing groove 113, the opening of the sealing groove 113 faces another adjacent nozzle section 110, a sealing ring 130 is provided in the sealing groove 113, and the sealing ring 130 abuts against another nozzle section 110, thereby achieving contact sealing.

[0056] It should be pointed out that in the related art, some nozzle rods will fill the chamber with positive pressure gas, but the positive pressure in the related art is only used to achieve air pressure dust prevention, that is, to prevent the molding sand from invading the chamber from the gap between the nozzle sections and affecting the contraction of the nozzle rod. The related art still relies on springs to achieve the retractability of the nozzle rod. (The spring nozzle rod does not inflate the chamber, but only has an exhaust hole. It is different from the inflatable application occasion, and the upper pressure plate structure is also different)

[0057] In some embodiments, the water inlet section 110 also includes a first limiting step 111 extending radially inward and a second limiting step 112 extending radially outward. The first limiting step 111 and the second limiting step 112 of two adjacent water inlet sections 110 are engaged with each other, thereby limiting the telescopic formation of the water inlet section 110.

[0058] Reference Figure 5In some embodiments, the upper platen 200 is formed with a first air distribution channel 210 , the first air distribution channel 210 is connected to the chamber 120 of the nozzle section 110 , and the first air distribution channel 210 is connected to the medium supply assembly.

[0059] It is understandable that the sand mold may have multiple nozzles, so multiple nozzle rods 100 are required accordingly. If each nozzle rod 100 is assigned a medium supply component, the complexity and cost of the molding equipment will be greatly increased. By making the first gas distribution channel 210 in the upper pressure plate 200, the pressure medium (here, gas medium) is distributed to different nozzle rods 100, which can simplify the design of the structure and also help to ensure the consistency of the pressure of different nozzle rods 100.

[0060] In order to simplify the processing technology, in some embodiments, the upper pressure plate 200 may include two or more sub-plates, and the surfaces of the sub-plates are processed with air guide grooves. The two sub-plates are stacked on each other, so that the air guide grooves are sandwiched between the two sub-plates to form a first air distribution channel 210.

[0061] In some embodiments, the molding equipment includes a connecting block 300, the upper pressure plate 200 is provided with a mounting hole, the connecting block 300 is arranged in the mounting hole, the nozzle rod 100 is arranged on the connecting block 300, and the connecting block 300 is formed with a second air distribution channel 310, one end of the second air distribution channel 310 is connected to the first air distribution channel 210, and the other end of the second air distribution channel 310 is connected to the chamber 120.

[0062] The present application also provides a nozzle forming method for making a nozzle in a sand molding process. The nozzle forming method includes: locking the telescopic state of the nozzle rod 100 during the demoulding stage.

[0063] Therefore, the nozzle rod 100 will not extend out as the mold 400 moves away during demoulding, which helps to reduce the risk of nozzle damage during demoulding.

[0064] Further, in some embodiments, the nozzle forming method includes:

[0065] Step S110: During the closing and compacting stage, the pressure medium in the nozzle rod 100 is controlled to be at a first pressure to resist the external force of the molding sand and maintain the nozzle rod 100 in contact with the mold 400;

[0066] Step S120 : During the demoulding stage, the pressure medium in the nozzle rod 100 is controlled to be at a second pressure to lock the contracted state of the nozzle rod 100 .

[0067] In this way, the pressure medium can play different roles in different stages of molding, enriching the function of the pressure medium. The nozzle rod 100 can be extended and retracted without the need for elastic parts such as springs, which can simplify the structural design of the nozzle rod 100.

[0068] In some selectable embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiment presented and described in the flow chart of the application is provided by way of example, for the purpose of providing a more comprehensive understanding of technology. The disclosed method is not limited to the operation and logic flow presented herein. Selectable embodiments are expected, wherein the order of various operations is changed and the sub-operation of a part described as a larger operation is performed independently.

[0069] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A nozzle rod, characterized in that: include: At least two nozzle sections, the nozzle sections are nested and connected in sequence along the axial direction, and the nozzle sections can move relatively in the axial direction so that the nozzle rod can be extended and retracted along the axis; The nozzle rod is configured to be locked in a contracted state by at least one of an internally arranged locking structure and an externally arranged locking device, so as to prevent the nozzle rod from extending and resetting in the process of moving away from the mold.

2. The nozzle rod according to claim 1, characterized in that: A chamber is formed inside the nozzle section, and each chamber is connected to each other. The nozzle rod is locked by a locking device, and the locking device includes a medium supply assembly. The chamber is used to connect to the medium supply assembly, and the medium supply assembly is used to control the pressure of the chamber so that the nozzle rod is locked in a contracted state.

3. The nozzle rod according to claim 2, characterized in that: The medium supply assembly is used to provide pressure medium, the pressure medium is gas, and the medium supply assembly includes an air pump and a gas distribution valve.

4. The nozzle rod according to claim 3, characterized in that: The connection parts of each nozzle section are provided with a sealing structure.

5. The nozzle rod according to claim 2, characterized in that: The medium supply assembly is used to generate positive pressure so that the nozzle rod abuts against the mold.

6. A shaping device, characterized in that: The molding equipment comprises an upper pressing plate and a nozzle rod according to any one of claims 1 to 5, wherein the nozzle rod is arranged on the upper pressing plate.

7. The molding device according to claim 6, characterized in that: The molding equipment further includes a medium supply assembly. The upper pressing plate is formed with a first air distribution channel. The first air distribution channel is communicated with the chamber of the nozzle section. The first air distribution channel is communicated with the medium supply assembly.

8. The molding device according to claim 7, characterized in that: The molding equipment includes a connecting block, the upper pressure plate is provided with a mounting hole, the connecting block is arranged in the mounting hole, the nozzle rod is arranged on the connecting block, and the connecting block is formed with a second air distribution channel, one end of the second air distribution channel is connected to the first air distribution channel, and the other end of the second air distribution channel is connected to the chamber.

9. A nozzle forming method, characterized in that: The nozzle forming method comprises: During the demoulding stage, the contraction state of the nozzle rod is locked.

10. The nozzle forming method according to claim 9, characterized in that: The nozzle forming method comprises: During the closing and compacting stage, the pressure medium in the nozzle rod is controlled to be at a first pressure to resist the external force of the molding sand and maintain the nozzle rod in contact with the mold; During the demoulding stage, the pressure medium in the nozzle rod is controlled to be at a second pressure to lock the contracted state of the nozzle rod.

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