Dilation extractor

Abstract

The utility model discloses a kind of expansion extractors, including handheld block, positioning slot is opened in handheld block, there is fixed module and movable module in positioning slot, fixed module is fixed in positioning slot, movable module is movably installed in positioning slot, adjusting rod is further rotationally connected in positioning slot, adjusting rod rotationally adjusts the distance between movable module and fixed module;The distance between fixed module and movable module is adjustable, this self-adapting clamping mode can be adapted to the inner hole of different diameters, avoid the slippage or drop due to size mismatch, significantly improve operation stability. Only need to rotate adjusting rod to complete fixed module and movable module expansion and clamping, without complex tool or multi-step operation;With the tensile force applied by handheld block, the whole demolition process can be completed quickly by a single person, significantly shorten maintenance time, easy to operate, improve demolition efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline maintenance technology, specifically relating to an expansion extractor. Background Technology

[0002] Threaded connections are one of the most common connection methods in mechanical equipment, pipeline maintenance, and routine installation work. However, due to reasons such as corrosion, overload tightening, thread adhesive bonding, or improper operation, it is not uncommon for taps, bolts, or joints with internal threads (such as threaded holes and pipe fittings) to break inside the workpiece. This residue (commonly known as "broken thread") is deeply embedded in the inner hole, flush with or below the surface of the workpiece, making it difficult to grasp and remove using conventional tools (such as wrenches and pliers). Fixing internal threads by welding or EDM is difficult and the corresponding equipment is too expensive. Utility Model Content

[0003] The purpose of this invention is to provide an expansion extractor to solve the problem of difficulty in removing "broken wires" in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An expansion extraction device includes a handheld block with a positioning groove. The positioning groove contains a fixed module and a movable module. The fixed module is fixed in the positioning groove, and the movable module is movably installed in the positioning groove. An adjusting rod is also rotatably connected in the positioning groove. The adjusting rod rotates to adjust the distance between the movable module and the fixed module.

[0005] Preferably, both the stationary module and the moving module are provided with external toothed grooves, which are symmetrically distributed on the outer walls of the stationary module and the moving module. The external toothed grooves form a mechanical engagement with the inner wall of the part being removed. Compared with a smooth surface, the toothed groove structure significantly increases the coefficient of friction. Even under high tension or vibration environments, the contact surface between the module and the inner wall remains stable, preventing slippage or detachment. It is also compatible with irregular surfaces: the external toothed groove structure can adapt to minor bumps, corrosion, or slight deformation of the inner wall, achieving reliable gripping through toothed groove embedding. This characteristic makes it suitable for the removal of old pipes, corrosive environments, or non-precision machined parts, breaking through the dependence of traditional smooth modules on the perfection of the inner hole. The toothed groove design is effective for inner holes of different materials such as metal, plastic, and ceramic, especially significantly improving the gripping force on hard materials (such as cast iron), reducing operational failures caused by material differences.

[0006] Preferably, the handheld block is rectangular, with a positioning hole on its short side. The bottom of the fixed module has a concentric hole that is concentric with the positioning hole. The adjusting rod passes through the positioning hole and is rotatably connected within the concentric hole. The adjusting rod's rotatable connection with the fixed module's concentric hole ensures that the rod's axis coincides with the center of the connecting block. This design eliminates eccentric sway during adjustment, ensuring that the expansion / contraction of the moving module is strictly axial, preventing jamming or module damage due to tilting.

[0007] Preferably, a connecting block is fixed at the bottom of the moving module, the connecting block is slidably installed in the positioning groove, the outer wall of the adjusting rod has a threaded structure, and the adjusting rod passes through the connecting block and maintains a threaded engagement with it.

[0008] Preferably, one end of the adjusting rod is fixed with a hexagonal countersunk head. The hexagonal countersunk head is a standardized interface, compatible with common tools, and can be directly adjusted using hexagonal tools (such as torque wrenches) from other equipment at the maintenance site.

[0009] Preferably, the protruding portion of the outer tooth groove is sharp. The protruding portion of the outer tooth groove of the expander extractor is sharp. The sharp protrusion enhances the inter-tooth engagement force and improves transmission reliability. Furthermore, the sharp protrusion generates a wedge-shaped effect during rotation, creating a mechanical self-locking between the outer tooth groove and the mating component. Even under vibration or reverse force, stable engagement can be maintained without the need for an additional locking device. The sharp tooth shape can adapt to minor deformations or wear of the mating component, filling gaps through re-engagement at the tooth tips.

[0010] The technical solution of this utility model has the following beneficial effects: 1. The distance between the fixed and moving modules is adjustable. This adaptive clamping method can accommodate inner holes of different diameters, avoiding slippage or detachment due to size mismatch, and significantly improving operational stability. The expansion and clamping of the fixed and moving modules can be completed simply by rotating the adjusting rod, without the need for complex tools or multiple steps. With the help of the hand block to apply pulling force, the entire dismantling process can be quickly completed by a single person, significantly shortening maintenance time, simplifying operation, and improving dismantling efficiency. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the unfolded moving module of this utility model.

[0014] Figure 3 This is a schematic diagram of the overall bottom structure of this utility model.

[0015] Figure 4 This is a partial structural schematic diagram of the present invention.

[0016] Reference numerals: 10, Hand-held block; 101, Positioning groove; 102, Fixed module; 103, Moving module; 104, External toothed groove; 105, Connecting block; 106, Adjusting rod; 107, Hexagonal countersunk head; 108, Concentric hole; 109, Positioning hole. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0018] Example 1: Reference Figures 1-4 , An expansion and extraction device includes a handheld block 10. The handheld block 10 has a positioning groove 101. The positioning groove 101 contains a fixed module 102 and a movable module 103. The fixed module 102 is fixed in the positioning groove 101, and the movable module 103 is movably installed in the positioning groove 101. An adjusting rod 106 is also rotatably connected in the positioning groove 101. The adjusting rod 106 rotates to adjust the distance between the movable module 103 and the fixed module 102.

[0019] In the above solution, this expansion extractor is used on bolts or threaded sleeves with inner holes. During use, rotating the adjusting rod 106 causes the fixed module 102 and the moving module 103 to come together to form a circle (note: the circle formed by the fixed module 102 and the moving module 103 needs to be smaller than the inner hole of the part being removed; the size of the expansion extractor is produced according to the actual use of different models of parts). The fixed module 102 and the moving module 103 are inserted into the inner hole of the part being removed. The adjusting rod 106 is rotated again to move the moving module 103 away from the fixed module 102. After the distance between the moving module 103 and the fixed module 102 is increased, the moving module 103 and the fixed module 102 will fit tightly against the inner wall of the inner hole of the part being removed. At this time, the damaged part can be removed from the pipe by holding the hand block 10 and applying a pulling force. During the process of applying a pulling force to the hand block 10, clamping tools can be used to increase the force. The distance between the fixed module 102 and the moving module 103 is adjustable. This adaptive clamping method can accommodate inner holes of different diameters, avoiding slippage or detachment due to size mismatch, and significantly improving operational stability. The expansion and clamping of the fixed module 102 and the moving module 103 can be completed simply by rotating the adjusting rod 106, without the need for complex tools or multiple steps. With the help of the hand block 10 to apply pulling force, the entire dismantling process can be quickly completed by a single person, significantly shortening maintenance time, simplifying operation, and improving dismantling efficiency.

[0020] Preferred reference Figures 1-4 Both the fixed module 102 and the moving module 103 of the expansion extractor are provided with external toothed grooves 104, which are symmetrically distributed on the outer walls of the fixed module 102 and the moving module 103.

[0021] In the preferred embodiment, the external toothed groove 104 forms a mechanical engagement with the inner wall of the part being removed. Compared to a smooth surface, the toothed groove structure significantly increases the coefficient of friction. Even under high tension or vibration environments, the contact surface between the module and the inner wall remains stable, preventing slippage or detachment. It is also compatible with irregular surfaces: the external toothed groove 104 structure can adapt to minor irregularities, corrosion, or slight deformation of the inner wall, achieving reliable gripping through toothed groove insertion. This characteristic makes it suitable for removing old pipes, corrosive environments, or non-precision machined parts, breaking through the dependence of traditional smooth modules on the perfection of the inner hole. The toothed groove design is effective for inner holes of different materials such as metal, plastic, and ceramic, especially significantly improving the gripping force on hard materials (such as cast iron), reducing operational failures caused by material differences.

[0022] Preferably, the expander handle 10 is rectangular, and a positioning hole 109 is provided on one of the short sides of the expander handle 10. The bottom of the expander positioning module 102 is provided with a concentric hole 108 that is concentric with the expander positioning hole 109. The expander adjusting rod 106 passes through the positioning hole 109 and is rotatably connected in the concentric hole 108.

[0023] In a preferred embodiment, the adjusting rod 106 is rotatably connected to the concentric hole 108 of the fixed module 102 via the positioning hole 109, ensuring that the axis of the rod coincides with the center of the connecting block 105. This design eliminates eccentric sway during adjustment, ensuring that the expansion / contraction of the moving module 103 is strictly axial, avoiding jamming or module damage caused by tilting.

[0024] Preferably, the bottom of the expansion extractor moving module 103 is fixed with a connecting block 105, the expansion extractor connecting block 105 is slidably installed in the positioning groove 101, the outer wall of the expansion extractor adjusting rod 106 has a threaded structure, the expansion extractor adjusting rod 106 passes through the connecting block 105 and maintains a threaded engagement with it.

[0025] In the preferred embodiment, the adjusting rod 106 and the connecting block 105 are driven by a threaded connection. Rotating the adjusting rod 106 converts the rotational displacement into the linear displacement of the connecting block 105. The thread pitch design allows for precise control of the expansion / contraction of the moving module 103, meeting the adaptation requirements of different inner hole sizes. The adjusting rod 106 adopts a standardized thread design (such as M6, M8, etc.) for easy procurement and replacement, and is compatible with rods of different lengths, adapting to pipes of different depths or complex working conditions.

[0026] Preferably, one end of the expansion extractor adjusting rod 106 is fixed with a hexagonal countersunk head 107. The hexagonal countersunk head 107 is a standardized interface, compatible with common tools, and can be directly adjusted using hexagonal tools (such as torque wrenches) from other equipment at the maintenance site.

[0027] Preferably, the protruding portion of the outer tooth groove 104 of the expander extractor is sharp. The sharp protrusion enhances the inter-tooth engagement force and improves transmission reliability. Furthermore, the sharp protrusion generates a wedge-shaped effect during rotation, creating a mechanical self-locking between the outer tooth groove 104 and the mating component. Even under vibration or reverse force, stable engagement is maintained without the need for an additional locking device. The sharp tooth shape can adapt to minor deformations or wear of the mating component, filling gaps through re-engagement at the tooth tips.

[0028] It should be noted that the sharp state is not the same as the pointed corner state. In the picture, the sharp top part is flat. The flat top structure reduces the exposed sharp corner, reducing the risk of hand cuts during operation; at the same time, it avoids the possibility of the teeth breaking due to excessive pressure.

[0029] The specific implementation process of this embodiment is as follows: By rotating the adjusting rod 106, the fixed module 102 and the moving module 103 are brought together to form a circle. The fixed module 102 and the moving module 103 are inserted into the inner hole of the part to be removed. By rotating the adjusting rod 106 again, the moving module 103 is moved away from the fixed module 102. After the distance between the moving module 103 and the fixed module 102 is increased, the moving module 103 and the fixed module 102 will be tightly attached to the inner wall of the inner hole of the part to be removed. At this time, the damaged part can be removed from the pipe by applying a pulling force by holding the hand block 10.

[0030] The above embodiments are merely exemplary models of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Various modifications or equivalent substitutions can be made to this utility model within its substance and scope of protection. Such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this utility model.

[0031] In the description of this utility model, it should be noted that the terms "inner," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the attached circle, or the orientation or positional relationship commonly used when the utility model product is in use. They are used 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. Therefore, these terms indicating orientation or positional relationship should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be further noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, these terms can refer to a fixed connection, a detachable connection, or an integral connection between components; they can also refer to a mechanical connection or an electrical connection; or they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

Claims

1. An expansion extractor, characterized in that: The device includes a handheld block (10), on which a positioning groove (101) is provided. The positioning groove (101) contains a fixed module (102) and a moving module (103). The fixed module (102) is fixed in the positioning groove (101), and the moving module (103) is movably installed in the positioning groove (101). An adjusting rod (106) is also rotatably connected in the positioning groove (101). The adjusting rod (106) is rotated to adjust the distance between the moving module (103) and the fixed module (102).

2. The dilatation extractor according to claim 1, characterized in that: Both the fixed module (102) and the moving module (103) are provided with external tooth grooves (104), which are symmetrically distributed on the outer walls of the fixed module (102) and the moving module (103).

3. The dilator extractor according to claim 2, characterized in that: The handheld block (10) is rectangular, and a positioning hole (109) is provided on one of the short sides of the handheld block (10). The bottom of the positioning module (102) is provided with a concentric hole (108) that is concentric with the positioning hole (109). The adjusting rod (106) passes through the positioning hole (109) and is rotatably connected in the concentric hole (108).

4. The dilator extractor according to claim 3, characterized in that: The bottom of the moving module (103) is fixed with a connecting block (105), the connecting block (105) is slidably installed in the positioning groove (101), the outer wall of the adjusting rod (106) has a threaded structure, the adjusting rod (106) passes through the connecting block (105) and maintains a threaded engagement with it.

5. The dilator extractor according to claim 4, characterized in that: One end of the adjusting rod (106) is fixed with a hexagonal countersunk head (107).

6. The dilatation extractor according to claim 2, characterized in that: The protruding part of the external tooth groove (104) is sharp.

Images