A core pulling mechanism

Abstract

The utility model relates to core pulling technology field especially, it relates to a core pulling mechanism, including the main support for pulling ceramic pipe, the main support is provided with the inner inflation subassembly for retracting in ceramic pipe to realize the function of stretching, the inner inflation subassembly includes the sector expansion block for inflating and locking ceramic pipe, the inner inflation subassembly still includes the center pull rod for pulling sector expansion block, the main support is installed with the drive subassembly for driving center pull rod vertical lift, the drive subassembly includes Z type handle for driving center pull rod vertical lift. The utility model discloses a one-key locking through Z type handle. Workers only need to press down Z type handle, utilize lever principle to produce huge lever support force, and it is automatically self -locking after passing dead point, effectively prevent accidental loosening in the process of hoisting, thereby help to improve the work safety and efficiency under high temperature environment, at the same time, through sector expansion block, open after, with ceramic pipe inner wall close 360 degree contact.

Description

Technical Field

[0001] This utility model relates to the field of core-pulling technology, and in particular to a core-pulling mechanism. Background Technology

[0002] In low-pressure casting production, ceramic tubes and the cores inside the mold often need to be replaced or cleaned. Because these components are usually mounted on the high-temperature furnace cover or deeply embedded inside the mold, and their structure is mostly a smooth cylindrical shape, the cleaning work is extremely difficult.

[0003] Existing ceramic tube clamps, such as the one disclosed in CN206588669U, employ an external clamping structure. However, they have the following significant drawbacks in actual confined space operations: First, existing clamps cannot enter narrow spaces, forcing workers to manually move the equipment after it cools down, resulting in extremely low efficiency and a significant risk of burns. Second, ceramic tubes are fragile, and external clamping installations typically have only two or three contact points, leading to concentrated height and making it highly susceptible to crushing the hot ceramic tubes instantly. Finally, existing threaded tightening clamps require workers to rotate them multiple times in a high-temperature environment to lock them, resulting in high labor intensity and a high risk of operational errors due to heat radiation. Utility Model Content

[0004] The purpose of this invention is to solve the problems of existing technologies, such as the inability to access narrow and deep holes, the need to handle fragile pipes, and low operating efficiency, and to propose a core-pulling mechanism.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A core-pulling mechanism includes a main support for pulling a ceramic tube. The main support is provided with an internal expansion component for telescoping within the ceramic tube to achieve a stretching function. The internal expansion component includes a fan-shaped expansion block for internally expanding and locking the ceramic tube. The internal expansion component also includes a central pull rod for pulling the fan-shaped expansion block. The main support is equipped with a drive component for driving the central pull rod to move vertically up and down. The drive component includes a Z-shaped handle for driving the central pull rod to move vertically up and down.

[0006] Preferably, the main support structure is a vertical rod structure.

[0007] Preferably, the internal expansion assembly includes a driving wedge block fixedly installed at the bottom end of the central tie rod, and a limiting groove for slidingly mounting the central tie rod is provided on the main body bracket. An elastic reset member is fixedly installed between the bottom end of the main body bracket and the top end of the driving wedge block, and the central tie rod is slidably mounted on the elastic reset member.

[0008] Preferably, the fan-shaped expansion block is composed of a first annular rod located on the left side of the main support, a second annular rod located at the top of the main support, and a third annular rod located at the right end of the main support. The first annular rod, the second annular rod, and the third annular rod form a cylindrical structure, and the second annular rod is fixedly installed at the top of the main support. The first annular rod, the third annular rod, and the drive wedge block sidewall are respectively pin-connected to two traction rods.

[0009] Preferably, the driving wedge is in the shape of an inverted frustum, and the diameter of the large end of the driving wedge is larger than the inner diameter of the fan-shaped expansion block in the contracted state, and the outer wall of the fan-shaped expansion block is provided with texture.

[0010] Preferably, the drive assembly includes a deflection base fixedly installed on the inner wall of the first annular rod, and the deflection base is used to provide deflection guidance for the Z-shaped grip. The surface of the main support is provided with a rectangular through hole that connects to the limiting slide groove. The Z-shaped grip is provided with a drive through hole in the middle. A flat-headed open pin is slidably installed in the middle of the drive through hole. The pins between the traction link and the drive wedge, the first annular rod, and the second annular rod are all flat-headed open pins.

[0011] Compared with the prior art, the present invention has the following advantages: 1. This utility model utilizes the inward contraction of a fan-shaped expansion block to reduce the overall outer diameter, allowing it to penetrate deep into the ceramic tube. Then, it is expanded by an elastic reset component to grab the tube wall from the inside, solving the problem of no operating space on the outside.

[0012] 2. This utility model uses a fan-shaped expansion block that expands to make near 360° contact with the inner wall of the ceramic tube. Compared with the point contact of traditional claws, the pressure is reduced, thus ensuring that the fragile ceramic tube wall will not be cracked when lifting heavy objects.

[0013] 3. This utility model achieves one-click locking through a Z-shaped handle. The worker only needs to press down the Z-shaped handle, which generates a huge lever support force using the lever principle. Moreover, it automatically locks itself after passing the dead point, effectively preventing accidental loosening during hoisting, thereby helping to improve the safety and efficiency of operation in high-temperature environments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the core-pulling mechanism proposed in this utility model; Figure 2 This is a rear view of the structure of a core-pulling mechanism proposed in this utility model; Figure 3 This is a schematic cross-sectional view of the core-pulling mechanism proposed in this utility model; Figure 4 This is a schematic diagram of a ceramic tube for a core-pulling mechanism proposed in this utility model.

[0015] In the diagram: 1. Main support; 2. Fan-shaped expansion block; 3. Deflection base; 4. Z-shaped grip; 5. Central tie rod; 6. Elastic reset component; 7. Drive wedge; 8. Traction link; 9. Flat-headed perforated pin. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] Reference Figures 1-4 A core-pulling mechanism includes a main support 1 and a ceramic tube. The main support 1 is a vertical rod structure and is preferably made of high-temperature resistant stainless steel to adapt to the high-temperature environment of low-pressure casting.

[0018] The main support 1 is equipped with an internal expansion component for expanding and contracting inside the ceramic tube to achieve the stretching function.

[0019] In some implementations, the internal expansion assembly is located at the lower part of the main support 1 and is used to extend into the ceramic tube for stretching. It mainly consists of a fan-shaped expansion block 2, a central tie rod 5, an elastic reset member 6, and a drive wedge 7.

[0020] The internal expansion assembly includes a fan-shaped expansion block 2 for internally expanding and locking the ceramic tube, and a central pull rod 5 for pulling the fan-shaped expansion block 2. A drive assembly for driving the central pull rod 5 to move vertically is installed on the main support 1. The drive assembly includes a Z-shaped handle 4 for driving the central pull rod 5 to move vertically.

[0021] The internal expansion assembly includes a drive wedge 7 fixedly connected to the bottom of the central tie rod 5 by a thread. The main support 1 has a limiting groove for sliding the central tie rod 5. An elastic reset member 6 is fixedly installed between the bottom of the main support 1 and the top of the drive wedge 7. The elastic reset member 6 can preferably be a high-rigidity, high-temperature resistant helical spring, which is sleeved on the central tie rod 5.

[0022] The sector-shaped expansion block 2 is the component that directly contacts the pipe wall. It is divided into three parts: a first annular rod at the top (left sector), a second annular rod at the top and integrally formed with the main support 1 (top sector), and a third annular rod on the right (right sector). These three parts, when closed, form an incomplete cylinder. At this critical location, the top sector is fixed, while the left and right sectors are movable. The outer surface of the sector-shaped expansion block 2 is knurled or has transverse serrations to increase the coefficient of friction with the ceramic pipe wall and prevent slippage.

[0023] The first and third annular rods are respectively pin-connected to the side wall of the drive wedge 7 by two traction links 8. The drive wedge 7 is in the shape of an inverted frustum and the taper angle of the drive wedge 7 is 15°-25° to achieve the force-increasing self-locking effect. The large end diameter of the drive wedge 7 is larger than the inner hole diameter of the fan-shaped expansion block 2 in the contracted state. The outer side of the outer wall of the fan-shaped expansion block 2 is textured.

[0024] In some embodiments, the drive assembly includes a deflection base 3 fixedly mounted on the inner wall of the first annular rod, and the deflection base 3 is used to provide deflection guidance for the Z-shaped grip 4. The surface of the main support 1 is provided with a rectangular through hole that connects to the limiting slide groove. The Z-shaped grip 4 is provided with a drive through hole in the middle. The flat-headed pin 9 passes through the drive through hole of the Z-shaped grip 4 and the pin hole on the central pull rod 5 in sequence. The pins between the traction link 8 and the drive wedge 7, the first annular rod, and the second annular rod are all flat-headed pins 9.

[0025] When the Z-shaped grip 4 moves in an arc around the deflection base 3, the flat-headed open pin 9 performs a small amount of sliding compensation in the drive through hole, converting the rotational motion of the Z-shaped grip 4 into the linear lifting motion of the central pull rod 5, effectively eliminating the motion interconnection that may be caused by rigid connection, ensuring the smoothness of the mechanism's operation, and shims are installed at all pin connections.

[0026] It should be noted that the specific model and specifications of the sector-shaped expansion block 2 need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be elaborated here.

[0027] The functional principle of this utility model can be explained through the following operation methods: When the ceramic tube needs to be replaced: In its natural state, the elastic reset member 6 is in a pre-tensioned state, tending to drive the wedge block 7 upward, keeping the fan-shaped expansion block 2 in its maximum outer diameter open state. When it is necessary to pull the ceramic tube, the operator presses down on the handle end of the Z-shaped grip 4, causing it to rotate around the deflection base 3. The Z-shaped grip 4 rotates around the deflection base 3, driving the central pull rod 5 to overcome the resistance of the elastic reset member 6 and move vertically through the flat-headed pin 9 in the central drive through hole. The central pull rod 5 drives the bottom drive wedge block 7 downward synchronously. At this time, the traction link 8 connecting the drive wedge block 7 with the first ring rod and the third ring rod is pulled by force, causing the top fan-shaped expansion block 2 to retract inward to the center. At this time, the overall outer diameter of the inner expansion assembly is reduced to less than the inner diameter of the ceramic tube, allowing the operator to easily insert the inner expansion assembly into the deep hole of the high-temperature ceramic tube.

[0028] Once the internal expansion reaches the predetermined depth, operate the Z-shaped grip 4. At this time, the compressed elastic reset member 6 quickly releases its elastic force, pushing the drive wedge 7 to reset vertically upward along the limiting slide groove. During the upward movement of the drive wedge 7, the traction link 8 applies an outward thrust to the left and right fan-shaped expansion blocks 2. The fan-shaped expansion blocks 2 extend outward along the boundary. Since the outer wall of the fan-shaped expansion blocks 2 has textures, and its outer diameter after expansion is slightly larger than or equal to the inner diameter of the ceramic tube, the fan-shaped expansion blocks 2 will tightly abut against the inner wall of the ceramic tube, achieving an internal support surface contact lock with the tube wall.

[0029] After locking, the main support 1 is lifted by external lifting tools or manually. During the lifting process, if the ceramic tube itself generates an increased pulling force, this force will act on the fan-shaped expansion block 2, pulling it downwards. However, as the traction link 8 approaches the dead point position with the drive wedge block 7, the subsequent weakening of the pulling force will further tend to flatten the traction link 8, thereby increasing the tensile force and forming a self-locking effect that tightens as it gets heavier, effectively preventing the ceramic tube from slipping during high-temperature hoisting.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A core-pulling mechanism, comprising a main support (1) for pulling a ceramic tube, characterized in that, The main support (1) is provided with an internal expansion component for extending and retracting inside the ceramic tube to achieve the stretching function. The internal expansion component includes a fan-shaped expansion block (2) for internal expansion and locking the ceramic tube. The internal expansion component also includes a central pull rod (5) for pulling the fan-shaped expansion block (2). The main support (1) is equipped with a drive component for driving the central pull rod (5) to rise and fall vertically. The drive component includes a Z-shaped handle (4) for driving the central pull rod (5) to rise and fall vertically.

2. The core-pulling mechanism according to claim 1, characterized in that, The main support (1) is a vertical rod structure.

3. The core-pulling mechanism according to claim 2, characterized in that, The internal expansion assembly includes a drive wedge (7) fixedly installed at the bottom of the central tie rod (5), and a limiting groove for slidingly mounting the central tie rod (5) is provided on the main body bracket (1). An elastic reset member (6) is fixedly installed between the bottom position of the main body bracket (1) and the top position of the drive wedge (7), and the central tie rod (5) is slidably mounted on the elastic reset member (6).

4. A core-pulling mechanism according to claim 3, characterized in that, The fan-shaped expansion block (2) is composed of a first annular rod located on the left side of the main support (1), a second annular rod located at the top of the main support (1), and a third annular rod located at the right end of the main support (1). The first annular rod, the second annular rod, and the third annular rod form a cylindrical structure. The second annular rod is fixedly installed at the top of the main support (1). The first annular rod, the third annular rod, and the drive wedge block (7) are respectively pin-connected to two traction rods (8).

5. A core-pulling mechanism according to claim 4, characterized in that, The driving wedge (7) is in the shape of an inverted frustum, and the diameter of the large end of the driving wedge (7) is larger than the inner hole diameter of the fan-shaped expansion block (2) in the contracted state. The outer side of the outer wall of the fan-shaped expansion block (2) is provided with texture.

6. A core-pulling mechanism according to claim 5, characterized in that, The drive assembly includes a deflection base (3) fixedly installed on the inner wall of the first ring rod, and the deflection base (3) is used to provide deflection guidance for the Z-shaped grip (4). The main support (1) has a rectangular through hole with a connecting limiting slide groove on its surface. The Z-shaped grip (4) has a drive through hole in the middle. A flat-headed pin (9) is slidably installed in the middle of the drive through hole. The pins between the traction link (8) and the drive wedge (7), the first ring rod and the second ring rod are all flat-headed pins (9).

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