Quick assembling and disassembling hook device for preparing investment casting shell

Abstract

The utility model relates to the field of investment casting assistive devices, in particular to a quick assembly and disassembly hook device for preparing an investment casting shell, which comprises an embedded joint, a locking sleeve, a protective sleeve, a cover plate, an outer push spring and a threaded suspender. The embedded connector is composed of a connector body, a cross-shaped clamping hook and a locking pin, the cross-shaped clamping hook is located at the head of the connector body, and the locking pin is located on the side face of the connector body. The locking sleeve and the protective sleeve are coaxial; the outward pushing spring is positioned in a radial gap formed by the protective sleeve and the locking sleeve; the threaded hanging rod is fixedly connected with the tail end of the locking sleeve in a threaded mode. The device can quickly form a connection relationship with a fusible model, the original process step of forming connection within 10-30 seconds is stably compressed to 1-3 seconds, and an operator does not need to be specially trained and practiced; the workload of an operator is greatly reduced, the contact time of the operator and chemical and dust substances is remarkably shortened, and meanwhile diffusion of the substances in a semi-closed environment of a workshop is reduced.

Description

Technical Field

[0001] This utility model relates to the field of investment casting auxiliary tools, specifically to a quick-release hook device for preparing investment casting mold shells. Background Technology

[0002] Investment casting, also known as silica sol casting, is commonly used to manufacture metal products with complex structures or intricate details. It is widely applied in fields such as sculpture, jewelry making, dentistry, and industrial restoration. Investment casting involves several process steps: 1) Preparing a fusible model: A fusible model is made using fusible materials (such as wax or plastic); 2) Preparing a monolithic shell: Through multiple applications of slurry and powder, several layers of a special refractory coating are applied to the outer surface of the fusible model, which are then dried and hardened to form a monolithic shell; 3) Phase transformation separation of the investment model and the shell: The investment model is melted from the shell using steam or hot water and poured out; 4) Dry sand reinforcement of the shell: The shell is placed in a sand box, and dry sand is filled around it to strengthen its strength; 5) High-temperature firing of the shell: The shell is placed in a furnace and fired at high temperature. After hardening, it can be used for precision casting.

[0003] In the actual production of investment casting mold shells, detachable hooks are usually connected to the gate feature of the investment casting mold shell. These hooks are used to transfer and position the shell between multiple stations, including subsequent coating, drying, and investment casting. However, the existing technology, which uses a manual method to connect the detachable hook to the gate feature via threads, has the following drawbacks: 1) The threaded connection is time-consuming; depending on the operator's skill level, connecting the threads on the detachable hook to the shell thread can take 10-30 seconds; 2) The operator's workload is heavy; during the threaded connection process, the operator needs to align and maintain the coaxiality of the internal and external threads; for large or multi-part mold shells, the requirements for the operator's strength and endurance are very high; 3) It pollutes the workshop environment; during the threaded connection process, the operator needs to be in contact with chemicals and dust for a long time; and the diffusion of these substances may lead to environmental pollution in the workshop.

[0004] Therefore, there is an urgent need to design a quick-release hook device for casting mold shells in investment casting processes. This quick-release hook device should be able to quickly and easily connect with the fusible mold, and maintain the stability and accuracy of the connection during subsequent transfer and positioning between multiple stations such as coating, drying, and investment casting. It should be noted that the information disclosed in this background section is only for understanding the background technology of this invention, and therefore may include information that does not constitute prior art. Utility Model Content

[0005] Existing technologies use a manual method to connect detachable hooks to fusible models via threads, which presents practical problems such as long connection time, heavy workload for operators, and pollution of the workshop environment. To address these issues, this invention proposes a quick-connect and disconnect hook device for preparing investment casting mold shells. This device can quickly and easily form a connection with the fusible model, and maintains the stability and accuracy of the connection during subsequent transfer and positioning processes across multiple workstations, including coating, drying, and investment casting.

[0006] The technical principle of this utility model device is as follows: a connector is pre-embedded inside the fusible mold, and the pre-embedded connector is manually inserted into the locking sleeve. The relative position of the pre-embedded connector and the locking sleeve is fixed through the locking hole on the locking sleeve, thus forming a connection between the pre-embedded connector and the locking sleeve. A cover plate and a protective sleeve are assembled on the outside of the locking sleeve. The elastic force of the spring presses the cover plate tightly onto the fusible mold gate surface to prevent the molding material from entering the gate and affecting the casting accuracy during the subsequent integral shell preparation step. The protective sleeve is located outside the locking sleeve to prevent the molding material from contaminating or blocking the motion mechanism and causing it to fail.

[0007] The specific solution of this utility model device is as follows: it includes a pre-embedded joint, a locking sleeve, a protective sleeve, a cover plate, an external push spring, and a threaded hanger. The pre-embedded joint is composed of three parts: a joint body, a cross hook, and a locking pin, which are fixedly connected. The cross hook is located at the head of the joint body, and the locking pin is located on the side of the joint body. Preferably, the locking pins are arranged in pairs, symmetrically arranged on both sides of the joint body. The external push spring is a helical spring, located in the radial gap formed by the protective sleeve and the locking sleeve. One end of the external push spring contacts the cover plate, and the movement of the cover plate towards the pre-embedded joint is limited by a cover plate limiting ring on the outer circumference of the locking sleeve. The other end of the external push spring contacts the spring limiting ring, which is fixedly installed on the outer circumference of the locking sleeve. The threaded hanger is threadedly fixedly connected to the end of the locking sleeve. During subsequent coating, drying, casting, and transfer and positioning processes of the fusible model between multiple workstations, the threaded hanger serves to fix the fusible model upside down.

[0008] Compared with the prior art, this utility model has significant advantages and beneficial effects, specifically reflected in the following aspects:

[0009] 1) Rapid connection with the fusible model: The process steps that originally took 10-30 seconds to form a connection are stably compressed to 1-3 seconds, and no special training or practice is required for operators;

[0010] 2) Significantly reduces the workload of operators: The fusible model has a pre-embedded connector inside, which does not need to consider the coaxiality between the two during the connection with the locking sleeve. Therefore, the connection operation is simple and convenient, and the requirements for the operator's strength and endurance are significantly reduced.

[0011] 3) Significantly reduces the time operators are exposed to chemicals and dust, while also reducing the spread of these substances in the semi-enclosed workshop environment.

[0012] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0013] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0014] Figure 1 This is a cross-sectional schematic diagram of the main body of the device of this utility model;

[0015] Figure 2 A schematic diagram showing the connection status between the pre-embedded joint and the locking sleeve;

[0016] Figure 3 This is a schematic diagram of the isometric structure of the device of this utility model;

[0017] In the diagram: 1. Cross hook; 2. Embedded joint; 21. Locking pin; 3. Cover plate; 31. Radial reinforcing rib; 4. Locking sleeve; 42. Locking hole; 5. Protective sleeve; 7. Push spring; 8. Cover plate limiting ring; 9. Spring limiting ring; 10. Threaded rod. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate for the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] like Figure 1 As shown, the device in this embodiment includes a pre-embedded connector 2, a locking sleeve 4, a protective sleeve 5, a cover plate 3, an external push spring 7, and a threaded lifting rod 10.

[0022] like Figure 2 As shown, the pre-embedded connector 2 is composed of three parts: a connector body, a cross hook 1, and a locking pin 21, which are fixedly connected. The cross hook 1 is located at the head of the connector body, and the locking pin 21 is located on the side of the connector body. Preferably, the locking pins 21 are arranged in pairs, symmetrically on both sides of the connector body. The function of the cross hook 1 is to increase the bonding strength between the pre-embedded connector 2 and the fusible model.

[0023] The locking sleeve 4 and the protective sleeve 5 are coaxial, and the protective sleeve 5 is located outside the locking sleeve 4; preferably, the protective sleeve 5 and the cover plate 3 are integral parts that are fixedly connected; preferably, radial reinforcing ribs 31 are evenly distributed on the cover plate 3; preferably, the reinforcing ribs 31 are made by stamping process, and the reinforcing ribs 31 protrude towards one side of the pre-embedded joint 2; if necessary, the location of the reinforcing ribs 31 should be smaller than the diameter of the fusible model gate; otherwise, the presence of the reinforcing ribs 31 will affect the sealing and protection performance of the cover plate 3 for the fusible model gate.

[0024] The push spring 7 is a helical spring, located in the radial gap formed by the protective sleeve 5 and the locking sleeve 4; one end of the push spring 7 is in contact with the cover plate 3, and the movement of the cover plate 3 toward the pre-embedded joint side is limited by the cover plate limiting ring 8 on the outer circle surface of the locking sleeve 4; the other end of the push spring 7 is in contact with the spring limiting ring 9, and the spring limiting ring 9 is fixedly installed on the outer circle surface of the locking sleeve 4.

[0025] The cover plate limiting ring 8 is fixed in the locking sleeve 4 as necessary.

[0026] Necessarily, in this embodiment, when the device is in Figure 1 In the indicated state, the push spring 7 is in a compressed state; the elastic force of the push spring 7 presses the cover plate 3 tightly against the gate surface of the fusible mold, preventing the molding material from entering the gate and affecting the casting accuracy during the subsequent integral shell preparation step. Therefore, the length, position, and protrusion direction of the reinforcing rib 31 are specially designed; otherwise, the molding material may enter the gate, affecting the casting accuracy.

[0027] like Figure 2 As shown, preferably, the locking hole 42 is in the shape of a "J".

[0028] like Figure 3 As shown, the threaded hanger 10 is threadedly fixed to the end of the locking sleeve 4. During subsequent coating, drying, casting, and transfer and positioning of the fusible model between multiple workstations, the threaded hanger 10 serves to hold the fusible model upside down and secure it.

[0029] Preferably, the thread at the end of the locking sleeve 4 is an internal thread; correspondingly, the thread at the end of the threaded rod 10 is an external thread.

[0030] In the investment casting process, the specific method of using this utility model device is as follows:

[0031] S0: Assemble the locking sleeve 4, spring limit ring 9, and protective sleeve 5 according to... Figure 1 The positions shown are arranged together;

[0032] S1: Make a fusible model using fusible material, and pre-embed a pre-embedded joint 2 inside the fusible model;

[0033] S2: Manually insert the pre-embedded connector 2 into the locking sleeve 4, and rotate the locking sleeve 4 at the same time, so that the locking pin 21 enters the locking hole 42; the relative position of the pre-embedded connector 2 and the locking sleeve 4 is fixed through the locking hole 42 on the locking sleeve 4, so that the pre-embedded connector 2 and the locking sleeve 4 form a fixed connection relationship.

[0034] S3: Through multiple applications of slurry and powder, several layers of special refractory coating are applied to the outer surface of the fusible model. After drying, the coating hardens to form an integral shell. During this process, the threaded hanger 10 serves to fix the fusible model upside down.

[0035] S4: Push towards the direction of the fusible model while rotating the locking sleeve 4 to disengage the locking pin 21 from the locking hole 42, and manually separate the embedded joint 2 and the locking sleeve 4; use steam or hot water to melt the fusible model mold from the shell and pour it out, while removing the embedded joint 2.

[0036] S5: Place the shell into the sand box and fill the shell with dry sand to strengthen its strength.

[0037] S6: Place the mold shell in a furnace and bake it at high temperature. After baking and hardening, it can be used for precision casting.

[0038] This embodiment proposes a quick-connect hook device for preparing investment casting mold shells. This device rapidly establishes a connection with the fusible model, compressing the original 10-30 seconds connection process to 1-3 seconds, without requiring special training or practice from the operator. It significantly reduces the operator's workload: a locking sleeve is pre-embedded inside the fusible model, eliminating the need to consider coaxiality during the connection process of the movable joint. Therefore, the connection operation is simple and convenient, significantly reducing the requirements for the operator's strength and endurance. It also significantly reduces the operator's contact time with chemicals and dust, while minimizing the diffusion of these substances in the semi-enclosed workshop environment.

[0039] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0040] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0041] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0042] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A quick-release hook device for preparing investment casting mold shells, characterized in that, include: Embedded joint (2), locking sleeve (4), protective sleeve (5), push spring (7), cover plate (3), cover plate limiting ring (8), and spring limiting ring (9); The pre-embedded connector (2) is composed of three parts: connector body, cross hook (1) and locking pin (21) fixedly connected; wherein, the cross hook (1) is located at the head of the connector body and the locking pin (21) is located on the side of the connector body. The locking sleeve (4) and the protective sleeve (5) are coaxially arranged, and the protective sleeve (5) is located outside the locking sleeve (4); The push spring (7) is a helical spring located in the radial gap formed by the protective sleeve (5) and the locking sleeve (4); one end of the push spring (7) is in contact with the cover plate (3), and the movement of the cover plate (3) toward the pre-embedded joint side is limited by the cover plate limiting ring (8) on the outer circle surface of the locking sleeve (4); the other end of the push spring (7) is in contact with the spring limiting ring (9); The cover plate limiting ring (8) and the spring limiting ring (9) are fixedly installed on the outer circular surface of the locking sleeve (4).

2. The quick-release hook device for preparing investment casting mold shells according to claim 1, characterized in that: The locking pins (21) are arranged in pairs and symmetrically arranged on both sides of the connector body; The relative positions of the pre-embedded joint (2) and the locking sleeve (4) are fixed by the locking hole (42) on the locking sleeve (4); The locking hole (42) is J-shaped.

3. The quick-release hook device for preparing investment casting mold shells according to claim 1, characterized in that: The device also includes a threaded rod (10); The threaded rod (10) is threadedly fixed to the end of the locking sleeve (4); The thread at the end of the locking sleeve (4) is an internal thread; the thread at the end of the threaded rod (10) is an external thread.

4. A quick-release hook device for preparing investment casting mold shells according to claim 1, characterized in that: The protective sleeve (5) and the cover plate (3) are integral parts that are fixedly connected; The cover plate (3) is evenly distributed with radial reinforcing ribs (31); The reinforcing rib (31) protrudes to one side of the pre-embedded joint (2).

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