Tappet hole core core-pulling block structure and sand core casting device

Abstract

The utility model belongs to foundry equipment technical field, concretely relates to a tappet hole core head draw block structure and sand core foundry equipment, and this draw block structure includes: at least one draw pipe is arranged in the mould, draw block is arranged in the draw pipe and the tail of draw block is equipped with the radial protruding stopper, spring is sleeved in the outer wall of draw block, and one end abuts and limits, the other end and draw pipe inner wall abut, the push rod for pushing draw block is connected as drive end one end, and the other end and draw block abut, when push rod moves to the direction close to sand core cavity, push rod pushes draw block, and spring is compressed to make the head of draw block extend into sand core cavity, when push rod moves to the direction away from sand core cavity, spring resets and drives stopper to retreat until stopper and draw pipe inner wall abut, makes the head of draw block exit sand core cavity.

Description

Technical Field

[0001] This utility model belongs to the field of casting equipment technology, and in particular relates to a core head extraction block structure for tappet holes and a sand core casting device. Background Technology

[0002] In the sand core injection molding process, the ejector core head puller is a key moving component that needs to reciprocate along the mold cavity to achieve sand core demolding and repositioning. In the existing sand core injection molding process, both the air needle and the puller are connected to a hydraulic cylinder. When the sand core is demolded, the air needle needs to completely leave the sand core, which lengthens the stroke of the puller's reciprocating motion. This also increases the time and distance of friction between the puller and the mold, making it prone to wear. After the puller wears, its fit with the mold decreases, resulting in incomplete ejector core head injection.

[0003] Therefore, how to reduce the wear of the tappet hole core head pull block is a technical problem that urgently needs to be solved by those skilled in the art.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0005] This disclosure provides at least one embodiment of a tappet core head extraction block structure and a sand core casting device.

[0006] In a first aspect, embodiments of this disclosure provide a pushrod hole core head extraction block structure, comprising:

[0007] At least one drawing tube is disposed within the mold;

[0008] A draw block is slidably disposed inside a draw tube, and the tail of the draw block is provided with a radially protruding limiting member.

[0009] A spring is fitted onto the outer wall of the draw block, with one end abutting against the limiting element and the other end abutting against the inner wall of the draw tube;

[0010] The push rod used to push the pull block has one end connected as the drive end and the other end abutting against the pull block;

[0011] As the push rod moves toward the sand core cavity, it pushes the extraction block, compressing the spring so that the head of the extraction block extends into the sand core cavity.

[0012] When the push rod moves away from the sand core cavity, the spring resets and pushes the limiter back until the limiter abuts against the inner wall of the extraction tube, causing the head of the extraction block to exit the sand core cavity.

[0013] In one alternative embodiment, the head of the drawing block includes a Z-shaped bending structure extending axially, and the mold has a groove that matches the bending structure, and the axial length of the groove is such that when the drawing block retracts, its head is completely retracted into the groove.

[0014] In one optional embodiment, the inner wall of the drawing tube is provided with a stop surface corresponding to the limiting member. When the spring is reset, the limiting member abuts against the stop surface to limit the retraction distance of the drawing block.

[0015] In one optional embodiment, when the head of the extraction block extends into the sand core cavity, the distance between the stop surface and the limiting member is not less than the length of the head of the extraction block extending into the sand core cavity.

[0016] Secondly, embodiments of this disclosure also provide a sand core casting apparatus, comprising:

[0017] A mold, which has a sand core cavity inside;

[0018] At least one drawing tube is disposed within the mold;

[0019] A draw block is slidably disposed inside a draw tube, and the tail of the draw block is provided with a radially protruding limiting member.

[0020] The elastic reset unit has one end acting on the limiting member and the other end acting on the inner wall of the tube.

[0021] A drive unit, which is connected to a power source, is configured to apply axial thrust to the block;

[0022] The drive unit moves toward the sand core cavity under the action of the power source, pushing the head of the extraction block into the sand core cavity, while compressing the elastic reset unit.

[0023] When the drive unit moves away from the sand core cavity, the elastic reset unit releases its elastic force to push the limiter, causing the head of the pull block to exit the sand core cavity and reset to its initial position.

[0024] In one optional embodiment, the elastic reset unit includes a spring sleeved on the outer wall of the draw block, one end of the spring abutting against a limiting member and the other end abutting against the inner wall of the draw tube.

[0025] In one alternative embodiment, the drive unit includes a push rod for pushing the pull block and a hydraulic cylinder, one end of the push rod being connected to the hydraulic cylinder and the other end abutting against the pull block.

[0026] In one alternative embodiment, the head of the drawing block includes a Z-shaped bending structure extending axially, and the mold has a groove that matches the bending structure, and the axial length of the groove is such that when the drawing block retracts, its head is completely retracted into the groove.

[0027] In one optional embodiment, the inner wall of the drawing tube is provided with a stop surface corresponding to the limiting member. When the elastic reset unit releases the elastic force, the limiting member abuts against the stop surface to reset the drawing block to the initial position.

[0028] The beneficial effects of this utility model are that the drawing block of this push rod hole core head drawing block structure is not directly connected to the hydraulic cylinder, but is set in the drawing tube inside the mold. The drawing block is slidably set in the drawing tube. When the push rod pushes the drawing block, the head of the drawing block extends into the sand core cavity. When the push rod is pulled out of the drawing tube, the spring resets and drives the drawing block to move away from the sand core cavity until the limiting member abuts against the inner wall of the drawing tube, so that the head of the drawing block exits the sand core cavity. Through the cooperation of the spring, the limiting member and the drawing tube, the stroke of the reciprocating motion of the drawing block is greatly reduced. Moreover, the drawing block is set in the drawing tube and does not directly contact the mold, thereby reducing the wear of the drawing block.

[0029] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and drawings.

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 A cross-sectional view of a push rod pushing and pulling block structure of a push rod hole core head pulling block provided in an embodiment of this disclosure, showing the push rod pushing and pulling block extending into the sand core cavity;

[0033] Figure 2 This is a cross-sectional view of a tappet core head pull block structure after the pull block is detached from the sand core cavity, as provided in an embodiment of this disclosure.

[0034] In the picture:

[0035] 100. Mold; 110. Slide groove; 200. Pull tube; 210. Stop surface; 300. Pull block; 310. Tail end; 320. Head; 311. Limiting component; 400. Elastic reset unit; 410. Spring; 500. Drive unit; 510. Push rod; 520. Hydraulic cylinder; 600. Sand core cavity. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0038] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0039] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0040] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0041] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0042] Research has revealed the following drawbacks of the existing technology: In the current sand core injection process, both the air needle and the ejector block are connected to the hydraulic cylinder. When the sand core is demolded, the air needle needs to completely leave the sand core, which lengthens the stroke of the ejector block's reciprocating motion. The time and distance of friction between the ejector block and the mold also increase, which can easily cause wear on the ejector block. After the ejector block wears down, its fitting accuracy with the mold decreases, resulting in incomplete injection of the ejector pin hole core head.

[0043] Based on the above research, this disclosure provides a core head puller structure and a sand core casting device. The puller is slidably set inside the puller tube, and a spring and a limiting component are provided. It does not need to move synchronously with the air needle, so that the puller can be inserted into the sand core cavity with a short movement. At the same time, the puller can be reset with a short retraction, which greatly reduces the stroke of the puller and solves the above problems.

[0044] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0045] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0046] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0047] See Figure 1 This disclosure provides a push rod core head pulling block structure, including: a mold 100, which has at least one pulling tube 200 disposed therein. A pulling block 300 is slidably disposed within the pulling tube 200, and the tail 310 of the pulling block 300 has a radially protruding limiting member 311. A spring 410 is sleeved on the outer wall of the pulling block 300, one end of the spring 410 abutting against the limiting member 311, and the other end abutting against the inner wall of the pulling tube 200. A push rod 510 for pushing the pulling block 300 is disposed on the outer side of the pulling tube 200, one end of which is connected to a hydraulic cylinder 520. Figure 1 As shown by arrow F1, when the hydraulic cylinder 520 drives the push rod 510 to move closer to the sand core cavity 600, the push rod 510 pushes the pull block 300, and the spring 410 is compressed so that the head 320 of the pull block 300 extends into the sand core cavity 600, at which point the sand core can be cast.

[0048] See Figure 2 After the sand core casting is completed, the extraction block 300 needs to be removed from the sand core cavity 600. At this point, simply drive the push rod 510 away from the sand core cavity 600 using the hydraulic cylinder 520. Figure 2 As indicated by arrow F2, the spring 410 resets and pushes the limiting member 311 to move away from the sand core cavity 600 until the limiting member 311 abuts against the inner wall of the drawing tube 200. The drawing block 300 then retracts to its original position. At this point, the head 320 of the drawing block 300 exits the sand core cavity 600, and the sand core can be demolded. Through the cooperation of the spring 410, the limiting member 311, and the drawing tube 200, the stroke of the drawing block 300 entering and leaving the sand core cavity 600 is greatly reduced. Furthermore, the drawing block 300 is positioned within the drawing tube 200 and does not directly contact the mold 100, thereby reducing wear on the drawing block 300.

[0049] See also Figure 1In some embodiments, the head 320 of the pull block 300 includes an axially extending Z-shaped bend structure. The mold 100 has a groove 110 that matches the bend structure, and the axial length of the groove 100 is configured such that when the pull block 300 retracts, its head 320 can be completely retracted into the groove 110. Preferably, when the pull block 300 retracts from the core mold 100, the Z-shaped bend structure just fills the groove 110, thus preventing any extra space that could cause wobbling or displacement. This also further limits the retraction distance of the pull block 300, which helps improve the stability and accuracy of the pull block 300.

[0050] See Figure 1 and Figure 2 In some embodiments, the inner wall of the drawing tube 200 is provided with a stop surface 210 corresponding to the limiting member 311. When the spring 410 is reset, the limiting member 311 abuts against the stop surface 210 to limit the retraction distance of the drawing block 300. When the head 320 of the drawing block 300 extends into the sand core, the distance between the stop surface 210 and the limiting member 311 is not less than the length of the head 320 of the drawing block 300 extending into the sand core, so that when the limiting member 311 abuts against the stop surface 210, the head 320 of the drawing block 300 can be completely disengaged from the sand core cavity 600.

[0051] See Figure 1 and Figure 2 Some embodiments also provide a sand core casting apparatus, including: a mold 100 having a sand core cavity 600 therein; at least one drawing tube 200 therein; a drawing block 300 slidably disposed within the drawing tube 200, and the tail 310 of the drawing block 300 having a radially protruding limiting member 311; an elastic reset unit 400, one end of which acts on the limiting member 311 and the other end of which acts on the inner wall of the drawing tube 200; and a drive unit 500 connected to a power source and configured to apply an axial thrust to the drawing block 300. Drive unit 500 moves toward the sand core cavity 600 under the action of power source, pushing the head 320 of pull block 300 into the sand core, while compressing elastic reset unit 400; when drive unit 500 moves away from sand core cavity 600, elastic reset unit 400 releases elastic force to push limit member 311, so that the head 320 of pull block 300 exits sand core cavity 600 and resets to the initial position.

[0052] See also Figure 1 In some embodiments, the elastic reset unit 400 includes a spring 410 sleeved on the outer wall of the draw block 300, one end of the spring 410 abutting against the limiting member 311, and the other end abutting against the inner wall of the draw tube 200.

[0053] See also Figure 1In some embodiments, the drive unit 500 includes a push rod 510 for pushing the draw block 300 and a hydraulic cylinder 520, one end of the push rod 510 being connected to the hydraulic cylinder 520 and the other end abutting against the draw block 300.

[0054] See Figure 2 In some embodiments, the inner wall of the drawing tube 200 is provided with a stop surface 210 corresponding to the limiting member 311. When the elastic reset unit 400 releases the elastic force, the limiting member 311 abuts against the stop surface 210. At this time, the drawing block 300 is limited, thereby causing the drawing block 300 to reset to the initial position.

[0055] In summary, the pull block 300 of this push rod core head pull block structure is not directly connected to the hydraulic cylinder 520. Instead, a pull tube 200 is set inside the mold 100, and the pull block 300 is slidably disposed inside the pull tube 200. When the hydraulic cylinder 520 drives the push rod 510 to push the pull block 300, the head 320 of the pull block 300 extends into the sand core cavity 600. When the push rod 510 is withdrawn from the pull tube 200, the spring 410 resets and drives the pull block 300 to move away from the sand core cavity 600 until the limiting member 311 abuts against the inner wall of the pull tube 200, causing the head 320 of the pull block 300 to exit the sand core cavity 600. Through the cooperation of the spring 410, the limiting member 311, and the pull tube 200, the reciprocating stroke of the pull block 300 is greatly reduced, and the pull block 300 is disposed in the pull tube 200 and does not directly contact the mold 100, thereby reducing the wear of the pull block 300.

[0056] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0057] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0058] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature and another element or feature illustrated in the figures. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0059] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0060] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A push rod hole core head pulling block structure, characterized in that, include: At least one drawing tube (200) is disposed within the mold (100); A draw block (300) is slidably disposed within a draw tube (200), and the tail (310) of the draw block (300) is provided with a radially protruding limiting member (311). A spring (410) is sleeved on the outer wall of the draw block (300), with one end abutting against the limiting member (311) and the other end abutting against the inner wall of the draw tube (200); The push rod (510) used for pushing the pull block (300) has one end connected as the drive end and the other end abutting against the pull block (300); When the push rod (510) moves toward the sand core cavity (600), the push rod (510) pushes the pull block (300), and the spring (410) is compressed so that the head (320) of the pull block (300) extends into the sand core cavity (600); When the push rod (510) moves away from the sand core cavity (600), the spring (410) resets and pushes the limit member (311) back until the limit member (311) abuts against the inner wall of the extraction tube (200), so that the head (320) of the extraction block (300) exits the sand core cavity (600).

2. The tappet hole core head extraction block structure as described in claim 1, characterized in that, The head (320) of the pull block (300) includes a Z-shaped bend structure extending axially; The mold (100) has a groove (110) that matches the shape of the bending structure, and the axial length of the groove (110) is such that when the pull block (300) retracts, its head (320) is completely retracted into the groove (110).

3. The tappet hole core head extraction block structure as described in claim 1, characterized in that, The inner wall of the drawing tube (200) is provided with a stop surface (210) corresponding to the limiting member (311). When the spring (410) is reset, the limiting member (311) abuts against the stop surface (210) to limit the retraction distance of the drawing block (300).

4. The tappet hole core head extraction block structure as described in claim 3, characterized in that, When the head (320) of the pull block (300) extends into the sand core cavity (600), the distance between the stop surface (210) and the limiting member (311) is not less than the length of the head (320) of the pull block (300) extending into the sand core cavity (600).

5. A sand core casting apparatus, characterized in that, include: A mold (100) having a sand core cavity (600) inside. At least one drawing tube (200) is disposed within the mold (100); A draw block (300) is slidably disposed within a draw tube (200), and the tail (310) of the draw block (300) is provided with a radially protruding limiting member (311). The elastic reset unit (400) has one end acting on the limiting member (311) and the other end acting on the inner wall of the tube (200); A drive unit (500) is connected to a power source and is configured to apply axial thrust to the pull block (300); The drive unit (500) moves toward the sand core cavity (600) under the action of the power source, pushing the head (320) of the pull block (300) into the sand core cavity (600) and compressing the elastic reset unit (400) at the same time. When the drive unit (500) moves away from the sand core cavity (600), the elastic reset unit (400) releases its elastic force to push the limit member (311), causing the head (320) of the pull block (300) to exit the sand core cavity (600) and reset to the initial position.

6. The sand core casting apparatus as described in claim 5, characterized in that, The elastic reset unit (400) includes a spring (410) sleeved on the outer wall of the draw block (300), one end of the spring (410) abutting against the limiting member (311), and the other end abutting against the inner wall of the draw tube (200).

7. The sand core casting apparatus as described in claim 5, characterized in that, The drive unit (500) includes a push rod (510) for pushing the pull block (300) and a hydraulic cylinder (520), one end of the push rod (510) is connected to the hydraulic cylinder (520), and the other end abuts against the pull block (300).

8. The sand core casting apparatus as described in claim 5, characterized in that, The head (320) of the pull block (300) includes a Z-shaped bend structure extending axially; The mold (100) has a groove (110) that matches the bending structure, and the axial length of the groove (110) is such that when the pull block (300) retracts, its head (320) is completely retracted into the groove (110).

9. The sand core casting apparatus as described in claim 5, characterized in that, The inner wall of the drawing tube (200) is provided with a stop surface (210) corresponding to the limiting member (311). When the elastic reset unit (400) releases the elastic force, the limiting member (311) abuts against the stop surface (210) so that the drawing block (300) is reset to the initial position.

Images