External thread cylindrical pin and dismounting tool thereof

Abstract

A cylindrical pin with external threads and a dismounting tool thereof relate to the technical field of cylindrical pins, a cylindrical pin body comprises a pin body and a knocking body, the outer diameter of the knocking body is smaller than that of the pin body, external threads are arranged on the connecting section of the pin body and the knocking body, a vent hole is axially formed in the pin body, the vent hole penetrates through the pin body and the knocking body, and a supporting sleeve is sleeved outside the pin body. The outer threads are arranged on the cylindrical pin, the gasket set is placed on one side of the supporting sleeve, the adjusting nut is in threaded connection with the outer threads and abuts against the gasket set, the outer threads are arranged on the cylindrical pin, the vent holes are selectively formed, the cylindrical pin can be rapidly disassembled in cooperation with an adjustable disassembling tool, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to an external thread cylindrical pin and a disassembly tool thereof, belonging to the technical field of cylindrical pins. Background Art

[0002] The cylindrical pin mainly fixes the relative position of the interconnected parts through interference fit, plays a positioning role, and ensures the accuracy of the relative position between the two parts after positioning. When installing the cylindrical pin in the case of a blind pin hole, according to the existing technology, an internal threaded cylindrical pin (GB / T120-2000) is used. Because it has no exhaust measures, there is a problem of difficulty in installing and removing the pin shaft. For example, the positioning pin between the primary and secondary reducers of the converter tilting system uses an internal threaded cylindrical pin, and the pin hole on the secondary reducer is a blind hole. The cylindrical pin is cooled with liquid nitrogen and its diameter is reduced. There is a gap between the pin hole and the pin hole, so it can be easily installed in place. However, if the cylindrical pin is unconditionally cooled with liquid nitrogen or other methods, the gas pressure inside the pin hole increases during interference fit installation. As the insertion depth increases, the pressure increases, causing difficulty in installation, or even failure to install. Due to the large installation resistance, it is necessary to increase the external force for installing the cylindrical pin, and the tail of the pin may be squeezed and deformed, causing damage to the internal thread.

[0003] During the disassembly process, due to the interference fit and the lack of air permeable surface between the pin and the hole, negative pressure is formed inside the pin hole, which increases the difficulty of disassembly. The size of the internal thread is smaller than the diameter of the pin shaft, and the thread strength is also low, which is easy to damage. If the internal thread is damaged during installation, it will be more difficult to disassemble the pin shaft. Existing disassembly tools, such as a cylindrical pin disassembly tool of multiple sizes disclosed in announcement No. CN202010556990.2, use three radially installed bolts to clamp the cylindrical pin to be disassembled, and then use an axially installed bolt to push the pin shaft out. Due to the limited clamping force of the bolts, this disassembly tool is more suitable for cylindrical pins with smaller diameters, and cannot be used for the disassembly of cylindrical pins with larger diameters. Utility Model Content

[0004] The purpose of the utility model is to provide an externally threaded cylindrical pin and a disassembly tool thereof in view of the defects or shortcomings in the prior art. By providing an external thread on the cylindrical pin and selectively providing a vent hole, the cylindrical pin can be quickly disassembled in conjunction with an adjustable disassembly tool, thereby greatly improving the working efficiency.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an externally threaded cylindrical pin, which includes a cylindrical pin body 1, wherein the cylindrical pin body 1 includes a pin body 1-1 and a knocking body 1-3, wherein the connecting section between the pin body 1-1 and the knocking body 1-3 is provided with an external thread 1-2, and the pin body 1-1 is axially provided with a vent hole 1-4, and the vent hole 1-4 runs through the pin body 1-1 and the knocking body 1-3.

[0006] Furthermore, the outer diameter of the external thread 1-2 is the same as the outer diameter of the pin body 1-1.

[0007] Furthermore, the outer diameter of the knocking body 1-3 is smaller than the outer diameter of the pin body 1-1.

[0008] Furthermore, the end of the pin body 1-1 away from the striking body 1-3 is an insertion end, and the insertion end is designed with an inclination angle of 15 degrees.

[0009] The utility model also provides a disassembly tool for an externally threaded cylindrical pin, which includes a supporting sleeve 2, a gasket group 3, and an adjusting nut 4. The supporting sleeve 2 is sleeved outside the pin body 1-1, the gasket group 3 is placed on one side of the supporting sleeve 2, and the adjusting nut 4 is threadedly connected to the external thread 1-2 and pressed against the gasket group 3.

[0010] After adopting the above technical scheme, the beneficial effect of the utility model is as follows: by setting an external thread on the cylindrical pin and selectively setting a vent hole, exhaust can be performed when installed in conjunction with a blind hole to prevent damage to the cylindrical pin, and the cylindrical pin can be quickly disassembled with an adjustable disassembly tool, greatly improving the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0012] Figure 1 It is a structural schematic diagram of the cylindrical pin body 1 in the utility model;

[0013] Figure 2 It is a schematic diagram of the matching state of the cylindrical pin body 1 and the disassembly tool in the utility model.

[0014] Explanation of the reference numerals: cylindrical pin body 1, pin body 1-1, external thread 1-2, striking body 1-3, supporting sleeve 2, gasket set 3, adjusting nut 4. DETAILED DESCRIPTION

[0015] See also Figure 1-2As shown, the technical solution adopted in this specific embodiment is: an external thread cylindrical pin, which includes a cylindrical pin body 1, the cylindrical pin body 1 includes a pin body 1-1 and a knocking body 1-3, the outer diameter of the knocking body 1-3 is smaller than the outer diameter of the pin body 1-1, the connecting section between the pin body 1-1 and the knocking body 1-3 is provided with an external thread 1-2, the pin body 1-1 is axially provided with a vent hole 1-4, the vent hole 1-4 passes through the pin body 1-1 and the knocking body 1-3, the traditional cylindrical pin is a same thread structure, there is no ventilation structure inside, when the cylindrical pin is unconditionally cooled by liquid nitrogen or other means, the inside of the pin hole is installed by interference fit As the gas pressure increases, as the insertion depth increases, the pressure increases, causing difficulty in insertion, or even failure to insert. Due to the large installation resistance, the external force for installing the cylindrical pin needs to be increased, and the tail of the pin may be squeezed and deformed, causing damage to the internal thread. Therefore, in this embodiment, an axially penetrating vent hole is provided in the pin body. Therefore, when the pin hole is a blind hole, exhaust is performed through the vent hole, thereby not increasing the difficulty of installation. When the workpiece is not a blind hole, a pin body structure without a vent hole can be used, and a knocking body is also provided as the end force end, so that the cylindrical pin can be installed better and the external thread can be protected.

[0016] In addition, since the traditional cylindrical pin adopts an internal thread structure, the internal thread size is smaller than the pin shaft diameter and the thread strength is also low. When the external force for disassembly is large, the thread structure is easily damaged, resulting in the cylindrical pin being unable to be removed. Therefore, in this embodiment, an external thread is provided on the pin body, which increases the thread size, increases the force-bearing area, and is not easy to cause damage to the thread.

[0017] To be more specific, the outer diameter of the external thread 1-2 is the same as the outer diameter of the pin body 1-1, and the same outer diameter setting facilitates use with a disassembly tool.

[0018] To be more specific, the end of the pin body 1-1 away from the striking body 1-3 is the insertion end, and the insertion end is designed with an inclination angle of 15 degrees. Setting the inclination angle at the front end of the pin body makes it easier to insert the pin body.

[0019] In order to facilitate the disassembly of the external threaded cylindrical pin of this embodiment, the utility model also provides a disassembly tool for the external threaded cylindrical pin, which includes a supporting sleeve 2, a gasket group 3, and an adjusting nut 4. The supporting sleeve 2 is sleeved outside the pin body 1-1, and the gasket group 3 is placed on one side of the supporting sleeve 2. The gasket group is composed of a plurality of separate gaskets, and in one embodiment, the gasket is a magnetic gasket, which is convenient for use as a whole group and also convenient for removal and use separately. The adjusting nut 4 is threadedly connected to the external thread 1-2 and is tightly pressed against the gasket group 3. In this embodiment, the inner diameter of the supporting sleeve matches the outer diameter of the pin body, so that the supporting sleeve can be smoothly sleeved with the pin body, and according to different working The installation depth of the cylindrical pin of the component structure is different, and the relative position of the supporting sleeve and the external thread is also different. In order to make the adjusting nut more completely connected with the external thread, it is necessary to adjust the number of gaskets in the gasket group. Specifically, when the cylindrical pin is installed deeper, the sleeve port may be closer to the external thread, or it has been sleeved with the external thread, and a smaller number of gaskets are used. When the installation is shallower, the sleeve port may be farther away from the external thread, and more gaskets are required to ensure that when the adjusting nut is connected to the external thread and contacts the supporting sleeve, it can contact the maximum number of threads, achieve maximum force, avoid damage to the external thread, and better disassemble the cylindrical pin.

[0020] The working principle of the utility model is as follows: when installing the cylindrical pin, since the front end is provided with an inclined angle, the pin body 1-1 can be inserted into the workpiece more conveniently, and a tool can be used to knock the knocking body 1-3 at the end without damaging the external thread 1-2. After the installation is completed, the external thread 1-2 is still exposed outside the workpiece. When the cylindrical pin is used for blind hole installation, the vent hole 1-4 can be vented to reduce the installation pressure, reduce the installation difficulty, and prevent deformation. When disassembling, the support sleeve 2 is sleeved with the pin body 1-1, and the bottom of the support sleeve 2 is abutted against the workpiece. The gasket group 3 is sleeved on the outside of the pin body 1-1 and abutted against the support sleeve 2. At this time, the adjusting nut 4 is screwed in and screwed with the external thread 1-2. When the adjusting nut 4 contacts the gasket group 3 and continues to rotate, the pin body 1-1 is pulled out.

[0021] The above description is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. An externally threaded cylindrical pin, characterized in that: The invention comprises a cylindrical pin body (1), wherein the cylindrical pin body (1) comprises a pin body (1-1) and a knocking body (1-3), wherein the outer diameter of the knocking body (1-3) is smaller than the outer diameter of the pin body (1-1), and the connecting section between the pin body (1-1) and the knocking body (1-3) is provided with an external thread (1-2), and the pin body (1-1) is axially provided with a vent hole (1-4), and the vent hole (1-4) passes through the pin body (1-1) and the knocking body (1-3).

2. The externally threaded cylindrical pin according to claim 1, characterized in that: The outer diameter of the external thread (1-2) is the same as the outer diameter of the pin body (1-1).

3. The externally threaded cylindrical pin according to claim 1, characterized in that: The outer diameter of the striking body (1-3) is smaller than the outer diameter of the pin body (1-1).

4. The externally threaded cylindrical pin according to claim 1, characterized in that: The end of the pin body (1-1) away from the striking body (1-3) is an insertion end, and the insertion end is designed with an inclination angle of (15) degrees.

5. A disassembly tool for an externally threaded cylindrical pin, characterized in that: It is suitable for disassembling the external thread cylindrical pin described in any one of claims 1 to 4, and comprises a supporting sleeve (2), a gasket group (3), and an adjusting nut (4). The supporting sleeve (2) is sleeved outside the pin body (1-1), the gasket group (3) is placed on one side of the supporting sleeve (2), and the adjusting nut (4) is threadedly connected to the external thread (1-2) and pressed against the gasket group (3).

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