A tool for extracting threaded fittings

Abstract

The present application discloses a tool for extracting threaded accessories to solve the problems of inconvenience in use and low work efficiency of existing extraction tools. The present application includes structures such as screws, load-bearing rotating caps, thrust bearings and annular bodies. When in use, when the bottom of the screw head contacts the groove on the load-bearing rotating cap, when the screw is tightened again, the pulling force of the internal thread of the target on the screw will press on the load-bearing rotating cap, and the reaction force of the load-bearing rotating cap on the screw will pull the target upward, and finally achieve the purpose; the present application has a simple structure, simple production, high degree of standardization of accessories, low cost, and easy acquisition; at the same time, the tool is small in size, requires very little operating space, is easy to use and labor-saving; has high work efficiency, so that the operator can more labor-savingly extract threaded pins, guide columns and other accessories; the use environment requirements are lower than the existing technology, and the scope of use is wider.

Description

Technical Field

[0001] The present application relates to the technical field of assembly tools, and in particular to a tool for pulling out threaded accessories. Background Art

[0002] There are many tools in the mechanical industry, such as pins, guide posts, etc., but these tools are difficult to remove, and are generally removed with the help of other removal tools (pins, guide posts, etc.). The removal tool usually includes a connecting rod, and a sleeve is provided on the outside of the connecting rod. The lower end of the connecting rod is buckled with the thread on the tool. When in use, the sleeve is used to hit the top of the connecting rod back and forth upward, so that the connecting rod pulls out the tool.

[0003] However, the existing removal tools have the following problems:

[0004] 1. The removal tools are large in size, some of which are nearly half a meter long. When the working environment is in a narrow place, it is very inconvenient to use;

[0005] 2. The removal tool is very heavy. The removal process mainly relies on the hammer head and sleeve to hit the upper end of the connecting rod to remove the tool connected to the connecting rod. The operation is very laborious and inefficient. If more large guide pillars are pulled out, it will take longer to rest and be more laborious.

[0006] 3. The production cost is high. The threaded head is made separately and even needs to be welded. The hammer head and connecting rod have complex shapes and are very troublesome to produce. Utility Model Content

[0007] To this end, the present application provides a tool for extracting threaded accessories to solve the problems of existing extraction tools such as inconvenience in use, low working efficiency and high cost.

[0008] In order to achieve the above objectives, this application provides the following technical solutions:

[0009] A tool for extracting a threaded accessory, comprising: a screw, a load-bearing rotating cap, a thrust bearing and a ring-shaped body;

[0010] The screw comprises a screw body and a screw head, the load-bearing rotating cap is divided into a first cylinder located at the upper part and a second cylinder located at the lower part, the outer diameter of the second cylinder is smaller than the outer diameter of the first cylinder, and the first cylinder and the second cylinder are provided with a through hole for the screw body to pass through along the axial direction, and the screw body is threadedly connected with the target with an internal thread hole after passing through the through hole;

[0011] A thrust bearing is disposed on the upper portion of the outer wall of the second cylinder, and the first cylinder and the main body are connected via the thrust bearing;

[0012] The length of the screw is greater than the total length of the first cylinder and the second cylinder.

[0013] Optionally, a groove is provided at the center of the upper portion of the first cylinder, and the groove is used to place the screw head.

[0014] Optionally, the inner wall of the main body and the outer wall of the second cylinder are further connected via a deep groove ball bearing;

[0015] The lower end of the second cylinder is connected to a nut by threading, and the upper end of the nut is in contact with the bottom of the deep groove ball bearing.

[0016] Optionally, a bearing seat is provided on the inner wall of the main body, and the bearing seat is located between the thrust bearing and the deep groove ball bearing.

[0017] Optionally, the length of the main body is greater than the length of the second cylinder.

[0018] Optionally, it further comprises an annular pad, which is placed at the bottom end of the main body to increase the retreat space of the target;

[0019] The inner diameter of the cushion block is smaller than the outer diameter of the main body and larger than the maximum outer dimension of the target.

[0020] Optionally, the main body, the second cylinder and the deep groove ball bearing are connected by threads or snap-fits.

[0021] Compared with the prior art, this application has at least the following beneficial effects:

[0022] 1. Based on further analysis and research on the existing technical problems, the present application provides a tool for pulling out threaded accessories, including a screw, a load-bearing rotating cap, a thrust bearing and an annular main body. When in use, after the bottom of the screw head contacts the groove on the load-bearing rotating cap, when the screw is further tightened, the pulling force of the internal thread of the target on the screw will press on the load-bearing rotating cap, and the reaction force of the load-bearing rotating cap on the screw will pull the target upward; the present application has a simple structure, simple production, high degree of standardization of accessories, low cost and easy acquisition; at the same time, the tool is small in size, and the process of applying force to the target requires very little operating space compared to the existing technology, so it is easy to use and labor-saving. It has a particularly good use effect in some narrow working spaces; at the same time, this tool cleverly converts the sliding friction at the bottom of the screw head into rolling friction, which greatly increases the torque of the screw thread on the target, and has high work efficiency, allowing operators to take out threaded pins, guide columns and other accessories with less effort; the use environment requirements are lower than those of the existing technology, and the scope of use is wider; the setting of the thrust bearing changes the sliding friction between the load-bearing rotating cap and the main body into rolling friction, reducing the loss of the screw torque, so that most of the torque applied by the screw can act on the target through the thread, making it easier to pull out, and also avoiding direct contact between the load-bearing rotating cap and the main body, reducing the loss;

[0023] 2. In the present application, the inner wall of the main body and the outer wall of the second cylinder are also connected by a deep groove ball bearing. The provision of the deep groove ball bearing can eliminate the corresponding sliding friction between the load-bearing rotating cap and the main body, thereby reducing the loss and facilitating the extraction of the target;

[0024] 3. The present application is also provided with an annular pad, which is placed at the bottom end of the main body to increase the retreat space of the target. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more intuitively illustrate the prior art and the present application, exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing the present application; for example, those skilled in the art are capable of easily making conventional adjustments or further optimizations to the addition / reduction / attribution division, specific shapes, positional relationships, connection methods, dimensional ratios, etc. of certain units (components) based on the technical concepts and exemplary drawings disclosed in the present application.

[0026] Figure 1 A schematic diagram of the structure of a tool for extracting a threaded accessory provided by one embodiment of the present application;

[0027] Figure 2 for Figure 1 Schematic diagram of the explosion shown;

[0028] Figure 3 for Figure 2 The front view shown;

[0029] Figure 4 for Figure 1 The cross-sectional view shown;

[0030] Figure 5 for Figure 2 Schematic diagram of the center load-bearing rotating cap;

[0031] Figure 6 For this application Figure 1 The schematic diagram of the usage status shown;

[0032] Figure 7 For this application Figure 6 Front view shown.

[0033] Description of reference numerals:

[0034] 1. Screw; 101. Screw body; 102. Screw head;

[0035] 2. load-bearing rotating cap; 21. first cylinder; 211. groove; 22. second cylinder;

[0036] 3. Thrust bearing; 301, bearing position;

[0037] 4. Main body; 5. Spacer; 6. Deep groove ball bearing; 7. Nut;

[0038] 8. Target; 801. Internal threaded hole; 9. Object. DETAILED DESCRIPTION

[0039] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0040] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0041] The terms such as "upper", "lower", "left", "right", "middle", etc. cited in this application are usually used to indicate the general relative position relationship for the purpose of intuitive understanding by referring to the drawings, and are not absolute limitations on the position relationship in the actual product.

[0042] One embodiment of the present application is a tool for extracting a threaded accessory, such as Figure 1-Figure 7 As shown, it includes: a screw 1, a load-bearing rotating cap 2, a thrust bearing 3 and an annular body 4;

[0043] The screw 1 includes a screw body 101 and a screw head 102. The load-bearing rotating cap 2 is divided into a first cylinder 21 located at the upper part and a second cylinder 22 located at the lower part. The outer diameter of the second cylinder 22 is smaller than the outer diameter of the first cylinder 21. The first cylinder 21 and the second cylinder 22 are provided with a through hole for the screw body 101 to pass through along the axial direction. The screw body 101 is threadedly connected with the target 8 after passing through the through hole. The target 8 is various accessories such as pins or guide columns with internal thread holes 801.

[0044] A thrust bearing 3 is disposed on the upper portion of the outer wall of the second cylinder 22, and the lower surface of the first cylinder 21 is connected to the upper surface of the main body 4 via the thrust bearing 3;

[0045] The length of the screw 1 is greater than the total length of the first cylinder 21 and the second cylinder 22 .

[0046] Preferably, if Figure 4 , Figure 5 As shown, a groove 211 is provided at the center of the upper portion of the first cylinder 21 , and the groove 211 is used to accommodate the screw head 102 .

[0047] Further preferably, it further comprises a deep groove ball bearing 6 and a nut 7;

[0048] The inner wall of the main body 4 and the outer wall of the second cylinder 22 are also connected through a deep groove ball bearing 6; the lower end of the second cylinder 22 is connected to the nut 7 by a thread, a snap or other means, the upper end of the nut 7 is in contact with the bottom of the deep groove ball bearing 6, and the outer end of the nut 7 is located at the lower part of the inner ring of the deep groove ball bearing 6. When the nut 7 is tightened, the load-bearing rotating cap 2 can be fastened to the deep groove ball bearing 6.

[0049] Preferably, if Figure 4 As shown, the inner wall of the main body 4 is provided with a bearing position 301 , and the bearing position 301 is located between the thrust bearing 3 and the deep groove ball bearing 6 .

[0050] Further preferably, the outer diameter of the first cylinder 21 is the same as the outer diameter of the main body 4 .

[0051] Preferably, the length of the main body 4 is greater than the length of the second cylindrical body 22 .

[0052] Further preferably, it also includes an annular gasket 5, which is placed at the bottom end of the main body 4 to increase the retreat space of the target 8; the inner diameter of the gasket 5 is smaller than the outer diameter of the main body 4 and larger than the maximum outer dimension of the target 8 (the object to be pulled out).

[0053] The length of the main body 4 is set to reserve a size sufficient for the target 8 to withdraw; if when pulling out the target 8, when the withdrawal space provided by the main body 4 is not enough for the target 8 to withdraw, the screw 1 can be retracted, and then the number of washers can be increased to perform reciprocating operations, thereby dynamically increasing the withdrawal space.

[0054] Preferably, the main body 4, the second cylinder 22 and the deep groove ball bearing 6 are connected by threads or snap-fits.

[0055] The functions of the above components are as follows:

[0056] The screw 1 is a standard part, which is easy to obtain and has low cost;

[0057] The bottom of the screw head 102 is pressed on the top of the load-bearing rotating cap 2 (specifically, the inner bottom surface of the groove 211 described below). When the screw 1 is screwed into the internal thread of the target 8, the tension of the internal thread on the screw 1 will press on the load-bearing rotating cap 2. The load-bearing rotating cap 2 has a reaction force on the screw 1, and this reaction force pulls out the pin.

[0058] The thrust bearing 3 separates the load-bearing rotating cap 2 from the main body 4. When the load-bearing rotating cap 2 is subjected to force (i.e., when the screw 1 begins to be screwed into the target 8), the load-bearing rotating cap 2 begins to rotate driven by the screw 1 and generates a relative spiral motion with the main body 4, and the load-bearing rotating cap 2 begins to generate downward pressure on the main body 4. At this time:

[0059] If there is no thrust bearing 3, under the combined effect of the relative rotational motion and the pressure, the load-bearing rotating cap 2 will generate a sliding friction force on the main body 4, and this friction force will change with the force of tightening the screw 1. When this friction force reaches a certain value, firstly, if the target 8 has not been pulled out, the screw 1 may not be able to be turned, because the friction force there will hinder the torque applied to the screw 1. Once the screw 1 has no torque, the screw 1 will no longer generate a force on the target 8; secondly, this friction force will cause huge losses on the contact surface between the load-bearing rotating cap 2 and the main body 4, seriously affecting its service life; therefore, the thrust bearing 3 (which can also be replaced by other structures such as ball and needle rollers) is used to connect the load-bearing rotating cap 2 and the main body 4, and the sliding friction between the load-bearing rotating cap 2 and the main body 4 is changed to rolling friction, which greatly reduces the loss of torque on the screw 1, so that most of the torque applied by the screw 1 can act on the target 8 through the thread, making it easier to pull out; at the same time, it also avoids direct contact between the load-bearing rotating cap 2 and the main body 4, reducing losses;

[0060] The main body 4 provides a space for the target 8 to exit and connects the various components together;

[0061] The deep groove ball bearing 6 is used to fix the load-bearing rotating cap 2 on the main body 4. Since the load-bearing rotating cap 2 will rotate, the setting of the deep groove ball bearing 6 can eliminate the corresponding sliding friction between the load-bearing rotating cap 2 and the main body 4.

[0062] Most of the above accessories are standard accessories, such as screws, nuts, bearings, etc., which are easy to obtain and inexpensive; at the same time, it is not easy for the tool to stop working due to damage of some accessories, which makes the comprehensive use efficiency of the tool higher.

[0063] The use principle of the above embodiment is as follows:

[0064] When using, pass the standard screw 1 through the tool and screw it into the thread of the target 8 (accessory) to be pulled out. At this time, the screw 1 sinks along the thread. When the bottom of the screw head 102 (screw cup head) contacts the load-bearing rotating cap 2, continue to turn the screw 1. The internal thread (screw thread) on the accessory will produce a sinking force on the screw 1. However, at this time, the screw 1 presses on the load-bearing rotating cap 2, the load-bearing screw cap 2 presses on the thrust bearing 3, and the thrust bearing 3 presses on the main body 4, so the screw 1 will not sink! At this time, the screw 1 produces a reaction force on the accessory to be pulled out, and this force pulls out the accessory to be pulled out! Finally achieve the purpose;

[0065] Specifically:

[0066] First, place the bottom surface of the main body 4 on the upper surface of the object 9 on which the target 8 is installed; then, insert the screw main body 101 of the screw 1 along the through hole on the load-bearing rotating cap 2, and tighten it into the internal threaded hole 801 of the target 8 below. When the bottom of the screw head 102 of the screw 1 contacts the groove 211 at the center of the load-bearing rotating cap 2, and then continue to tighten the screw 1, the load-bearing rotating cap 2 will start to rotate under the drive of the screw 1, and will produce relative rotational motion with the main body 4, and exert downward pressure on the main body 4; at this time, the screw 1 will no longer move downward, but only perform a rotational tightening action, and the pulling force of the internal thread of the target 8 on the screw 1 will press on the load-bearing rotating cap 2, and the load-bearing rotating cap 2 has a reaction force on the screw 1, and this reaction force pulls the target 8 upward;

[0067] When the exit space provided by the main body 4 for the target 8 is not enough for it to be completely pulled out from the object 9, when the target 8 is pulled out a certain distance, the screw 1 can be retracted upward, and the main body 4, the load-bearing rotating cap 2, the thrust bearing 3, the deep groove ball bearing 6 and the nut 7 can be moved upward as a whole, and then a gasket is added to the bottom of the main body 4, and the above-mentioned reciprocating operation is performed, which can dynamically increase the exit space of the target 8 until the target 8 completely exits the object 9.

[0068] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A tool for extracting threaded accessories, characterized in that: include: Screws, load-bearing swivel caps, thrust bearings and annular bodies; The screw comprises a screw body and a screw head, the load-bearing rotating cap is divided into a first cylinder located at the upper part and a second cylinder located at the lower part, the outer diameter of the second cylinder is smaller than the outer diameter of the first cylinder, and the first cylinder and the second cylinder are provided with a through hole for the screw body to pass through along the axial direction, and the screw body is threadedly connected with the target with an internal thread hole after passing through the through hole; A thrust bearing is disposed on the upper portion of the outer wall of the second cylinder, and the first cylinder and the main body are connected via the thrust bearing; The length of the screw is greater than the total length of the first cylinder and the second cylinder.

2. The tool for extracting threaded accessories according to claim 1, characterized in that: A groove is provided at the center of the upper portion of the first cylinder, and the groove is used to place the screw head.

3. The tool for extracting threaded accessories according to claim 1, characterized in that: The inner wall of the main body and the outer wall of the second cylinder are also connected via a deep groove ball bearing; The lower end of the second cylinder is connected to a nut by threading, and the upper end of the nut is in contact with the bottom of the deep groove ball bearing.

4. The tool for extracting threaded accessories according to claim 3, characterized in that: The inner wall of the main body is provided with a bearing seat, and the bearing seat is located between the thrust bearing and the deep groove ball bearing.

5. The tool for extracting threaded accessories according to claim 1, characterized in that: The length of the main body is greater than the length of the second cylinder.

6. The tool for extracting threaded accessories according to claim 1, characterized in that: It also includes an annular pad, which is placed at the bottom end of the main body and is used to increase the retreat space of the target; The inner diameter of the cushion block is smaller than the outer diameter of the main body and larger than the maximum outer dimension of the target.

7. The tool for extracting threaded accessories according to claim 3, characterized in that: The main body, the second cylinder and the deep groove ball bearing are connected by threads or snap-fits.

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