A lifting tool and use method

Abstract

The present invention relates to a lifting tool, and in particular to a lifting tool that can be pre-buried for making sand molds in casting and a method of use. It comprises: a main sleeve structure and a lifting structure; the main sleeve structure is arranged in the sand mold, the main sleeve structure is a semi-enclosed cavity, the lifting structure is arranged in the cavity, and the lifting structure and the cavity are limitedly matched; the main sleeve structure and the core box are interference fit, and the core box and the sand mold are interference fit. The present invention provides a lifting tool, the purpose of which is to solve the problem that the sand mold is damaged during lifting and the sand mold is not filled with standard sand after lifting by pre-buried lifting tool in the sand mold.

Description

Technical Field

[0001] The invention relates to a lifting tool, in particular to a lifting tool which can be pre-buried when making a sand mold in a casting and a use method thereof. Background Art

[0002] In the casting production process, the sand mold has different structures and sizes due to the different shapes of the castings. Therefore, the lifting points of each sand mold are also different. In order to accurately lift and place the sand mold, the lifting point is usually determined in combination with the shape and center of gravity of the sand mold. In this way, for the surface of the sand mold in the direction of the lifting point, it is not easy to determine the position of the lifting point for a complex structure. Generally, when making the sand mold, after determining the position of the lifting point of the sand mold, a hook (formed by bending the steel bar) is embedded at the lifting point 10-15mm away from the surface of the sand mold. After the sand mold is made and the molding sand hardens, the sand mold must be removed from the core box. Usually, the pre-embedded hook is manually opened at the lifting point of the sand mold for easy lifting. After the entire lifting process of the sand mold is completed, the part of the lifting point position that is opened is filled with sand. The above operation has two significant disadvantages: first, when the pre-embedded hooks in the sand mold are removed, part of the structure of the sand mold will be destroyed. When encountering a pre-embedded hook at a curved surface, the sand mold will be destroyed on a large scale; second, after the pre-embedded hook position in the sand mold is removed, it must be repaired with loose sand. Because it is a manual repair, the shape, size, and compactness of the sand mold surface after the repair cannot be guaranteed. There is currently no tooling to solve this problem. Summary of the invention

[0003] The invention provides a lifting tool, aiming at solving the problems that the sand mold is damaged during lifting and the sand filling of the sand mold is not standardized after lifting, by pre-burying the lifting tool in the sand mold.

[0004] The object of the present invention is achieved in this way: a lifting tool, the tool structure includes: a main sleeve structure, a lifting structure; the main sleeve structure is arranged in a sand mold, the main sleeve structure is a semi-enclosed cavity, the lifting structure is arranged in the cavity, and the lifting structure is limitedly matched with the cavity; the main sleeve structure is interference fit with the core box, and the core box is interference fit with the sand mold.

[0005] The method for using the lifting tool comprises the following steps:

[0006] Clamp the lifting tooling on the rod slot positioning platform of the core box; fill the core box with sand to form the shape, remove the core box after the sand hardens, and detach the rod slot positioning platform from the rod slot; when lifting, hang the lifting device on the rod exposed on the surface of the sand mold, the rod extends out of the rod slot, and the movable rod cooperates with the inner wall limiter opposite to the bottom of the movable cavity; after the lifting is completed, put the rod back into the rod slot, the movable rod returns to the bottom of the movable cavity, fill the sand in the sand replenishing slot, and fill the sand mold surface completely.

[0007] In one embodiment, the main sleeve structure consists of a hanger groove, a hollow tube and a movable cavity. The hanger groove and the movable cavity are respectively penetrated at both ends of the hollow tube. The vertical projection area of ​​the movable cavity is larger than the hanger groove, and the horizontal projection area of ​​the movable cavity is larger than the hanger groove. The hollow tube is a circular tube.

[0008] In one embodiment, a sand replenishment positioning platform is provided on the core box, and a horizontal projection area of ​​the sand replenishment positioning platform is larger than the suspension rod groove.

[0009] In one embodiment, one end of the sand replenishment positioning platform is arranged in accordance with the shape of the core box, and the other end opposite thereto is a plane.

[0010] In one embodiment, a suspension rod groove positioning platform is provided at one end of the sand replenishment positioning platform away from the core box, and the suspension rod groove positioning platform matches the suspension rod groove.

[0011] In one embodiment, the lifting structure is composed of a suspension rod, a main rod and a movable rod, wherein the suspension rod, the main rod and the movable rod are integrally formed.

[0012] In one embodiment, a rubber ring is provided on the suspension rod.

[0013] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0014] It can fully realize the auxiliary lifting of any structural sand mold when it needs to be lifted, especially when the lifting point surface of the sand mold is a curved surface or the lifting point surface is small, it can be lifted without damaging the surface structure of the sand mold. It is simple to operate, fast, and highly safe; it can be reused, has a simple outer contour structure, and is small in size, which is easy to organize and store; after using the pre-buried lifting tool of the present invention, the surface treatment of the sand mold is simple, and the surface quality of the sand mold is improved; the pre-buried lifting tool of the present invention can be divided into levels according to the weight of the sand mold, and lifting tools of different sizes and specifications are designed for different levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the lifting tooling;

[0016] Figure 2 This is a schematic diagram of the use of lifting equipment;

[0017] Figure 3 This is a schematic diagram of the main set structure;

[0018] Figure 4 This is a schematic diagram of the lifting structure;

[0019] 100-sand mold, 200-core box, 201-sand replenishing positioning table, 202-hanging rod slot positioning table, 300-main sleeve structure, 301-hanging rod slot, 302-hollow tube, 303-movable cavity, 400-lifting structure, 401-hanging rod, 402-main rod, 403-movable rod. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0021] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right", "top", "bottom", "bottom end", "top end" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] A sand mold pre-embedded lifting tool, the main material of which is steel, and the structure mainly includes: a main sleeve structure 300 and a lifting structure 400; the main sleeve structure 300 is arranged in the sand mold 100, the main sleeve structure 300 is a semi-enclosed cavity, the lifting structure 400 is arranged in the cavity, and the lifting structure 400 is limitedly matched with the main sleeve structure 300; the main sleeve structure 300 is interference fit with a core box 200, and the core box 200 is interference fit with the sand mold 100.

[0024] See also Figure 4 The lifting mechanism 400 is an "I"-shaped structure, and includes a suspension rod 401, a main rod 402 and a movable rod 403, all of which are round tubes and integrally formed, wherein the length of the suspension rod 401 is greater than that of the movable rod 403. Preferably, the length of the suspension rod 401 is 1.5 times the length of the movable rod 403 to ensure that the lifting structure 400 occupies the smallest space and is most convenient for lifting.

[0025] See also Figure 3 The main sleeve structure 300 is a semi-enclosed cavity, and the main sleeve structure 300 is composed of a hanger rod groove 301, a hollow tube 302 and an active cavity 303. The two ends of the hollow tube 302 are respectively penetrated by the hanger rod groove 302 and the active cavity 303, and the central axes of the three are consistent. The vertical projection area of ​​the active cavity 303 is larger than the hanger rod groove 302, and the horizontal projection area of ​​the active cavity 303 is larger than the hanger rod groove 302. Preferably, the length of the horizontal projection surface of the hanger rod groove 301 is 1.5 times that of the hanging active cavity 303, the width of the horizontal projection surface of the hanger rod groove 301 is the same as that of the hanging active cavity 303, and the height of the vertical projection surface of the active cavity 303 is 5 times that of the hanger rod groove. The hollow tube of the active cavity is a circular tube. Preferably, the cross-sectional diameter of the hollow tube is 30 mm.

[0026] See also Figure 1 When the lifting tool is in the non-lifting state, the movable rod 403 contacts the inner wall of the bottom of the movable cavity 303, one end of the lifting rod 401 contacts the inner wall of the lifting rod groove 301, and a gap is set between the other end of the lifting rod 401 and the unclosed end of the lifting rod groove 301. Preferably, the gap is set to 5mm. A sand replenishment positioning platform 201 is set at the lifting point position on the core box 200, and the horizontal projection area of ​​the sand replenishment positioning platform 201 is larger than the lifting rod groove. Preferably, the length of the horizontal projection surface of the sand replenishment positioning platform 201 is larger than the length of the horizontal projection surface of the lifting rod groove 301. The boom groove is 5-10mm larger, the sand replenishment positioning platform 201 is 15mm high, and a boom groove positioning platform 202 is arranged on the sand replenishment positioning platform 201. The boom groove positioning platform 202 matches the boom groove 301. Preferably, the height of the boom groove positioning platform 202 is set to 5mm. The end of the sand replenishment positioning platform 201 that contacts the core box 200 can be set freely according to the surface shape of the core box, and the other end opposite to it is a plane, which is convenient for setting the boom groove positioning platform 202 on the sand replenishment positioning platform 201.

[0027] After the core box 200 is placed, the embedded lifting tooling is clamped on the suspension rod groove positioning platform 202 of the core box 200, and then sand is filled. After the sand hardens, the core box 200 is removed, and the opening surface of the suspension rod groove 302 will be exposed on the surface of the sand mold 100. The suspension rod 401 is in the suspension rod groove 301. When the lifting tooling is in the lifting state, the suspension rod 401 is pulled out upward, and the movable rod 403 is limitedly matched with the top inner wall of the movable cavity 303, and the sling is hung on the suspension rod for lifting. After all the lifting processes are completed, the suspension rod 401 is put back into the suspension rod groove 301, the movable rod 403 returns to the bottom of the movable cavity 303, and then sand is filled in the sand replenishing groove to fill the surface of the sand mold 100 completely.

[0028] In one of the embodiments, a rubber ring is provided on the suspension rod 401, and the suspension rod 401 can be pulled out from the suspension rod groove 301 by the elasticity of the rubber ring. When the rubber ring is pulled by fingers, the elasticity of the rubber ring will make it longer and there will be a gap between the rubber ring and the suspension rod 401, which will make it easier to pull out the suspension rod 401, and the rubber ring is tightly wrapped around the suspension rod 401 in a free state and does not take up space.

[0029] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A lifting tool, characterized in that: The tooling structure includes: a main sleeve structure and a lifting structure. The main sleeve structure is arranged in the sand mold. The main sleeve structure is a semi-enclosed cavity composed of a suspension rod groove, a hollow tube and a movable cavity. The lifting structure is composed of a suspension rod, a main rod and a movable rod, wherein the suspension rod, the main rod and the movable rod are integrally formed. The lifting structure is arranged in the cavity. The lifting structure is limitedly matched with the cavity, the main sleeve structure is interference matched with the core box, and the core box is interference matched with the sand mold; the suspension rod groove and the movable cavity are respectively penetrated at both ends of the hollow tube, the projection area of ​​the movable cavity in the vertical direction is larger than that of the suspension rod groove, and the projection area of ​​the movable cavity in the horizontal direction is larger than that of the suspension rod groove, and the hollow tube is a round tube.

2. A lifting tool according to claim 1, characterized in that: A sand replenishment positioning platform is arranged on the core box, and a horizontal projection area of ​​the sand replenishment positioning platform is larger than the suspension rod groove.

3. A lifting tool according to claim 2, characterized in that: One end of the sand replenishing positioning platform is arranged in accordance with the core box, and the other end opposite thereto is a plane.

4. A lifting tool according to claim 2, characterized in that: A suspension rod groove positioning platform is arranged at one end of the sand replenishment positioning platform away from the core box, and the suspension rod groove positioning platform matches the suspension rod groove.

5. A lifting tool according to claim 1, characterized in that: A rubber ring is arranged on the suspension rod.

6. A method for using a lifting tool as claimed in any one of claims 1 to 5, characterized in that: The steps include: Clamp the lifting tooling on the rod slot positioning platform of the core box; fill the core box with sand to form the shape, remove the core box after the sand hardens, and detach the rod slot positioning platform from the rod slot; when lifting, hang the lifting device on the rod exposed on the surface of the sand mold, the rod extends out of the rod slot, and the movable rod cooperates with the inner wall limiter opposite to the bottom of the movable cavity; after the lifting is completed, put the rod back into the rod slot, the movable rod returns to the bottom of the movable cavity, fill the sand in the sand replenishing slot, and fill the sand mold surface completely.

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