Rotary pin pulling device

Abstract

The present invention is a rotary pin pulling device, comprising a base, a threaded pulling rod and a rotating nut. A through hole with a circular cross-section is opened in the center of the base. The threaded pulling rod is inserted into the through hole. The rotating nut is sleeved on the threaded pulling rod and abuts against the end surface of the base. A connecting end is provided on the threaded pulling rod, and the connecting end is used to connect with a connecting head. The connecting head is used to connect a positioning pin. The threaded pulling rod is driven to be pulled out by rotating the nut. The continuous rotation of the rotating nut is converted into the upward movement of the threaded pulling rod, which can accurately control the pulling rhythm, evenly output force, reduce the wear of the positioning pin, and ensure the safe operation of the unit.

Description

Technical Field

[0001] The invention relates to the field of maintenance, and in particular to a rotary pin pulling device. Background Art

[0002] A large number of locating pins need to be pulled out during the mechanical maintenance of the generator set. Pin puller is a commonly used tool in maintenance work. Impact pin pullers are often used, or the pins are pulled out by knocking. The locating pin itself is a precision component. Impact and knocking methods will reduce its accuracy after multiple pull-outs, affecting the normal operation of the unit and posing a safety hazard. Summary of the invention

[0003] The present invention aims to provide a rotary pin pulling device to solve the above-mentioned problem.

[0004] To achieve the purpose of the present invention, the technical solution adopted is a rotary pin pulling device, including a base, a threaded pulling rod and a rotating nut, a through hole with a circular cross-section is opened in the center of the base, the threaded pulling rod is inserted into the through hole, the rotating nut is sleeved on the threaded pulling rod and abuts against the end face of the base, the threaded pulling rod is provided with a connecting end, the connecting end is used to connect to a connecting head, and the connecting head is used to connect a locating pin.

[0005] Furthermore, the threaded pull rod is provided with two limiting surfaces symmetrically arranged along the length direction of the threaded pull rod, the two limiting surfaces are parallel to each other, and the inner wall of the through hole close to the rotating nut is provided with two symmetrical limiting steps, so that the limiting steps cooperate with the limiting surfaces to limit the rotation of the threaded pull rod.

[0006] Furthermore, the distance between the limiting surface and the minor diameter of the threaded pull rod is half of the difference between the major diameter and the minor diameter of the threaded pull rod.

[0007] Furthermore, a ball bearing is provided on the base, so that the rotating nut abuts against the ball bearing.

[0008] Furthermore, the ball bearing includes an inner shaft and an outer shaft which are arranged concentrically, a side ball is arranged between the inner shaft and the outer shaft, and a lower ball is also arranged on the inner shaft so that the lower ball is in contact with the base.

[0009] Furthermore, the connector includes an upper connector, a lower connector and a connector body, the upper connector is a concealed connection structure, and the lower connector is a threaded connector.

[0010] Furthermore, the concealed connection structure includes an elastic connecting plate, a boss is provided at one end of the elastic connecting plate, and the ends of multiple elastic connecting plates away from the boss are connected to the connecting body, so that the elastic connecting plates form a circle, the boss is located on the inner side of the circle, and the connecting end is provided with an annular step, and the lower end surface of the annular step is a slope.

[0011] Furthermore, a non-threaded section is provided on the threaded pull rod, the non-threaded section is close to the connecting end, an unlocking ring is sleeved on the non-threaded section, and the lower end surface of the unlocking ring is an inclined surface for pushing open the boss so that the boss passes over the annular step.

[0012] Furthermore, a reinforcement sleeve is sleeved on the outer wall of the base, and a plurality of the reinforcement sleeves are continuously arranged.

[0013] Furthermore, an auxiliary bolt coaxial with the threaded pull rod is fixedly provided at one end of the threaded pull rod away from the connection end.

[0014] The present invention provides a rotary pin pulling device, which drives a threaded puller rod to pull out by rotating a nut. The continuous rotation of the rotary nut is converted into upward movement of the threaded puller rod, which can accurately control the pulling rhythm, evenly output force, reduce the wear of the positioning pin, and ensure the safe operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the extraction device in an embodiment of the present invention;

[0016] Figure 2 is a cross-sectional view of an extraction device according to an embodiment of the present invention;

[0017] Figure 3 is a cross-sectional view of the extraction device in another angle in an embodiment of the present invention;

[0018] Figure 4 Schematic diagram of the structure of the threaded pull rod and its upper parts in an embodiment of the present invention;

[0019] Figure 5 is a schematic structural diagram of a ball bearing in an embodiment of the present invention;

[0020] Figure 6 Schematic diagram of the structure of the connector in the embodiment of the present invention.

[0021] 10-base; 11-limiting step; 20-threaded pull rod; 21-limiting surface; 22-annular step; 30-rotating nut; 40-connector; 41-elastic connecting plate; 411-boss; 42-lower joint; 43-connector; 50-ball bearing; 51-outer shaft; 52-inner shaft; 53-side ball; 54-lower ball; 60-unlocking ring; 70-auxiliary bolt. DETAILED DESCRIPTION

[0022] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the present invention.

[0023] like Figure 1-6 As shown:

[0024] A rotary pin pulling device includes a base 10, a threaded pull rod 20 and a rotating nut 30. A through hole with a circular cross section is opened in the center of the base 10. The threaded pull rod 20 is inserted into the through hole. The rotating nut 30 is sleeved on the threaded pull rod 20 and abuts against the end surface of the base 10. A connecting end is provided on the threaded pull rod 20, and the connecting end is used to be connected to a connecting head 40. The connecting head 40 is used to connect a locating pin.

[0025] The threaded pull rod 20 passes through the through hole, the rotating nut 30 is sleeved on the threaded pull rod 20, the positioning pin is connected to the threaded pull rod 20 through the connector 40, the rotating nut 30 abuts against the end surface of the base 10, and when it is twisted, it drives the threaded pull rod 20 to pull the pin.

[0026] As a preferred solution, the threaded pull rod 20 is provided with two limiting surfaces 21 symmetrically arranged along the length direction of the threaded pull rod 20, the two limiting surfaces 21 are parallel to each other, and two symmetrical limiting steps 11 are provided on the inner wall of the through hole close to the rotating nut 30, so that the limiting steps 11 cooperate with the limiting surfaces 21 to limit the rotation of the threaded pull rod 20.

[0027] When the rotating nut 30 rotates, the threaded pull rod 20 tends to follow the movement, which in turn causes the locating pin to tend to rotate, which increases the wear of the locating pin. The limiting surface 21 can be directly processed from the threaded pull rod 20 by cutting. The limiting surfaces 21 formed by cutting are arranged on the side of the threaded pull rod 20 and are parallel to each other, and match the size of the accommodating space formed between the two oppositely arranged limiting steps 11 on the inner wall of the through hole. The limiting steps 11 cooperate with the limiting surfaces 21 to limit the rotation of the threaded pull rod 20. When the pin pulling operation is performed, the threaded pull rod 20 only moves in a straight line, reducing the wear of the locating pin.

[0028] As a preferred solution, the distance between the limiting surface 21 and the minor diameter of the threaded pull rod 20 is half of the difference between the major diameter and the minor diameter of the threaded pull rod 20 .

[0029] The rotating nut 30 drives the threaded puller 20 to move, and its force-bearing parts are concentrated at the position where the threads are engaged. The pin pulling operation requires a certain amount of power output, which also places a demand on the strength of the threads. It can be understood that for each circle of threads, the thickness gradually decreases from the inside to the outside. When processing the limiting surface 21, the cut-off part is controlled within half of the difference between the major diameter and the minor diameter. For each circle of threads, the thread continuity can be guaranteed. The more parts are cut off, the integrity of the cut threads will gradually decrease. If the parts cut off are too small, the limiting surface 21 will be relatively narrow. Once the rotation trend is intense, a situation similar to the wear of the edges and corners of the nut will occur, and its function of limiting the rotation of the threaded puller 20 will be lost.

[0030] As a preferred solution, a ball bearing 50 is provided on the base 10 , so that the rotating nut 30 abuts against the ball bearing 50 .

[0031] When the rotating nut 30 is turned, the rotating nut 30 abuts against the base 10, resulting in a large friction force, which is inconvenient for the operator to exert force and also causes the problem of worn parts. By adding a ball bearing 50, the sliding friction between the rotating nut 30 and the base 10 is converted into rolling friction inside the ball bearing 50, which greatly reduces resistance and avoids wear of parts.

[0032] As a preferred solution, the ball bearing 50 includes an inner shaft 52 and an outer shaft 51 which are arranged concentrically, a side ball 53 is arranged between the inner shaft 52 and the outer shaft 51, and a lower ball 54 is also arranged on the inner shaft 52 so that the lower ball 54 contacts the base 10.

[0033] The overall state of the entire device when it is working is grasped. The connection or contact abutment relationship includes the base 10 and the locating pin mounting body, the locating pin and the connecting head 40, the connecting head 40 and the threaded pull rod 20, the rotating nut 30 and the threaded pull rod, and the rotating nut 30 and the ball bearing 50. Multiple connection relationships cooperate with each other. The perfect state is that the axis or rotation center of all involved components is located on the same straight line. In fact, due to assembly, manufacturing and other processes, there are gaps between components or component size deviations, and there will be eccentricity. The ball bearing 50 is provided with side balls 53. When the inner shaft 52 and the outer shaft 51 move relative to each other, there is a margin that can be cheap, which can reduce the movement or movement trend in other directions other than the standard pull-out path caused by eccentricity.

[0034] As a preferred solution, the connector 40 includes an upper connector, a lower connector 42 and a connector 43, the upper connector is a concealed connection structure, and the lower connector is a threaded connector.

[0035] When performing the pin pulling operation, the force output by the operator is mainly transmitted to the locating pin through the interaction between the rotating nut 30 and the threaded pulling rod 20. Due to the interaction of forces, there is a reaction force between the base and the locating pin installation body, which is actually a supporting relationship. In order to form such a supporting relationship, it is necessary that after the connection between the locating pin and the connecting head 40 is completed, the base 10 can be well abutted against the locating pin installation body. In other words, the connecting function of the connecting head 40 needs to be performed in an unobservable position, and a concealed connecting structure is set at the connecting head 40 to complete the above operation.

[0036] As a preferred solution, the concealed connection structure includes an elastic connecting plate 41, a boss 411 is provided at one end of the elastic connecting plate 41, and one end of multiple elastic connecting plates 41 away from the boss 411 is connected to the connecting body 40, so that the elastic connecting plates 41 form a circle, the boss 411 is located on the inner side of the circle, and an annular step 22 is provided at the connecting end, and the lower end surface of the annular step 22 is a slope.

[0037] A blind connection is achieved through a concealed connection structure and the connecting end. The diameter of the circle surrounded by the boss 411 is smaller than the outer diameter of the annular step 22, but larger than the inner diameter of the annular step 22. Due to the inclined surface of the lower end face of the annular step 22, when the boss 411 moves toward the annular step 22, the elastic connecting plate 41 is stretched open, and after passing over the annular step 22, the upper end faces of the annular step 22 are conveniently abutted against each other.

[0038] As a preferred solution, a non-threaded section is provided on the threaded pull rod 20, and the non-threaded section is close to the connecting end. An unlocking ring 60 is sleeved on the non-threaded section, and the lower end surface of the unlocking ring 60 is an inclined surface, which is used to push open the boss 411 so that the boss 411 passes over the annular step 22.

[0039] The inclined surface of the lower end surface of the unlocking ring 60 moves toward the boss 411 to push the boss 411 open, so that the boss 411 is freed from the restriction of the upper end surface of the annular step 22, and the disassembly of the connector 40 is completed.

[0040] As a preferred solution, a plurality of connectors 40 are provided with the same upper connectors and different sizes of lower connectors 43, so that the device can be used to extract positioning pins of various types.

[0041] As a preferred solution, a reinforcement sleeve is sleeved on the outer wall of the base 10, and multiple reinforcement sleeves are continuously arranged. The structure of the reinforcement sleeve is not shown in the figure. The reinforcement sleeve is a groove-shaped component with the same shape as the base 10, and is fixed to the base 10 in a detachable manner such as a lock or bolt, which can increase the contact area between the base 10 and the positioning pin installation body and enhance the stability of the device during use.

[0042] As a preferred solution, an auxiliary bolt 70 coaxial with the threaded rod 20 is fixedly provided at one end of the threaded rod 20 away from the connection end. When performing the locating pin connection, it is necessary to adjust the initial relative position between the rotating nut 30 and the threaded rod 20 to facilitate the operator's operation.

[0043] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "top", "root", "inside", "outside", "periphery", "inside", "inner side", "outer side" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of facilitating the description of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Among them, "inside" refers to an internal or enclosed area or space. "Periphery" refers to the area surrounding a specific component or a specific area.

[0044] In the description of the embodiments of the present invention, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "assemble" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the description of the embodiments of the present invention, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0047] In the description of the embodiments of the present invention, it is to be understood that "-" and "~" represent the range between two values, and the range includes the endpoints. For example: "AB" represents a range greater than or equal to A and less than or equal to B. "A~B" represents a range greater than or equal to A and less than or equal to B.

[0048] In the description of the embodiments of the present invention, the term "and / or" herein is merely a term used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotary pin pulling device, characterized in that: It comprises a base, a threaded rod and a rotating nut, wherein a through hole with a circular cross section is opened in the middle of the base, the threaded rod is inserted into the through hole, the rotating nut is sleeved on the threaded rod and abuts against the end surface of the base, and a connecting end is provided on the threaded rod, the connecting end is used to be connected to a connecting head, and the connecting head is used to connect a positioning pin; The threaded rod is provided with two limiting surfaces symmetrically arranged along the length direction of the threaded rod, the two limiting surfaces are parallel to each other, and the inner wall of the through hole close to the rotating nut is provided with two symmetrical limiting steps, so that the limiting steps cooperate with the limiting surfaces to limit the rotation of the threaded rod; A ball bearing is provided on the base, so that the rotating nut abuts against the ball bearing; The connector includes an upper connector, a lower connector and a connector body, the upper connector is a concealed connection structure, and the lower connector is a threaded connector; The concealed connection structure includes an elastic connection plate, one end of which is provided with a boss, and the ends of multiple elastic connection plates away from the boss are connected to the connecting body, so that the elastic connection plates form a circle, the boss is located on the inner side of the circle, and the connection end is provided with an annular step, and the lower end surface of the annular step is a slope.

2. A rotary pin pulling device according to claim 1, characterized in that: The distance between the limiting surface and the minor diameter of the threaded pull rod is half of the difference between the major diameter and the minor diameter of the threaded pull rod.

3. A rotary pin pulling device according to claim 1, characterized in that: The ball bearing comprises an inner shaft and an outer shaft which are arranged concentrically, a side ball is arranged between the inner shaft and the outer shaft, and a lower ball is also arranged on the inner shaft so that the lower ball contacts the base.

4. A rotary pin pulling device according to claim 1, characterized in that: The threaded pull rod is provided with a non-threaded section, which is close to the connecting end. An unlocking ring is sleeved on the non-threaded section, and the lower end surface of the unlocking ring is an inclined surface, which is used to push open the boss so that the boss passes over the annular step.

5. A rotary pin pulling device according to claim 1, characterized in that: A reinforcement sleeve is sleeved on the outer wall of the base, and a plurality of the reinforcement sleeves are continuously arranged.

6. A rotary pin pulling device according to claim 1, characterized in that: An auxiliary bolt coaxial with the threaded pull rod is fixedly provided at one end of the threaded pull rod away from the connection end.

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