Stud tightening tool

Abstract

A double-end bolt tightening tool comprises a two-section type mandrel, a first threaded sleeve arranged at the first end of the mandrel in a sleeving mode, a second threaded sleeve arranged at the second end of the mandrel in a sleeving mode, a reset spring arranged on the mandrel in a sleeving mode and located in the second threaded sleeve, and a limiting pin transversely penetrating through the first threaded sleeve and the mandrel at the same position. The two-section type mandrel comprises a butt joint section mandrel and an ejector rod section mandrel, and the contact faces of the butt joint section mandrel and the ejector rod section mandrel are concave-convex S-shaped deformation directional driving faces which are matched with each other. A limiting protruding ring is arranged on the outer wall of the mandrel of the ejector rod section in a protruding mode. A kidney-shaped limiting hole is transversely formed in the position, located on the limiting protruding ring, of the mandrel of the ejector rod section in a penetrating mode, the kidney-shaped limiting hole corresponds to a round limiting hole formed in the side wall of the first threaded sleeve, and the limiting pin penetrates through the round limiting hole and the kidney-shaped limiting hole. According to the tightening tool, the circular motion of the butt joint section mandrel is converted into the axial linear reciprocating motion of the ejector rod section mandrel through mutual matching of the S-shaped deformation driving surfaces, and the meshing force of the stud and the second threaded sleeve is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tightening shafts, in particular to a stud bolt tightening tool. Background Art

[0002] The existing stud bolt tightening tool includes a pair of joints and a sleeve; one end of the joint is connected to the tightening shaft, and the other end is extended along the axial direction to set a push rod, and the push rod is screwed with the sleeve; the two ends of the sleeve are provided with internal threads, wherein the internal thread at the first end is screwed with the push rod, and the internal thread at the second end is used to screw the stud bolt to be tightened on the workpiece. The existing stud bolt tightening tool has the following defects:

[0003] 1) When the stud bolt is screwed to the sleeve, the push rod holds the stud bolt, and its bite force is greater than the bite force at the product end, which can easily loosen or remove the stud bolt from the workpiece;

[0004] 2) Since the stud bolts are in end-face contact when they are held by the push rod, the contact area is large and the friction is large. When the tightening shaft is reversed, the stud bolts are easily loosened or removed from the workpiece. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a stud bolt tightening tool to overcome the deficiencies in the prior art.

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A stud bolt tightening tool comprises a coaxially arranged two-section mandrel, a first screw sleeve sleeved on the first end of the mandrel, a second screw sleeve sleeved on the second end of the mandrel, a return spring sleeved on the mandrel and located in the second screw sleeve, and a stop pin laterally co-located and penetrating the first screw sleeve and the mandrel;

[0008] The two-section mandrel comprises a docking section mandrel and a push rod section mandrel, and the contact surfaces of the docking section mandrel and the push rod section mandrel are mutually matched concave and convex S-shaped direction-changing driving surfaces.

[0009] Furthermore, a limiting convex ring is protruded on the outer wall of the core shaft of the push rod section; a waist-shaped limiting hole is transversely penetrated through the core shaft of the push rod section at the position of the limiting convex ring, and the waist-shaped limiting hole corresponds to the circular limiting hole opened on the side wall of the first screw sleeve.

[0010] Furthermore, a first assembly hole is provided on the top of the first screw sleeve for the docking section core shaft to pass through and dock with the tightening shaft; a circular limiting hole is provided on the side wall of the first screw sleeve corresponding to the waist-shaped limiting hole of the core shaft of the top rod section; the first screw sleeve is provided with an internal thread that is threadedly connected to the external thread on the second screw sleeve.

[0011] Furthermore, a limiting step is provided in the inner cavity of the second screw sleeve corresponding to the limiting convex ring of the mandrel of the push rod section, so that one end of the return spring abuts against the limiting convex ring of the mandrel of the push rod section, and the other end abuts against the limiting step in the second screw sleeve.

[0012] Furthermore, the limiting pin passes through the circular limiting hole on the first screw sleeve and penetrates the waist-shaped limiting hole of the core shaft of the push rod section.

[0013] Furthermore, a docking port is provided on the end surface where the docking section core shaft and the tightening shaft are docked, and a docking pin is provided through the side wall of the docking port.

[0014] Preferably, the end of the mandrel of the push rod segment that contacts the stud bolt is provided with a ball head.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1) A stud bolt tightening tool in this case is coaxially provided with a two-section mandrel, which includes a docking section mandrel and a push rod section mandrel. The contact surface between the docking section mandrel and the push rod section mandrel is a matching concave and convex S-shaped direction-changing driving surface, so that when the docking section mandrel rotates in the circumferential direction, it can drive the push rod section mandrel to make axial linear reciprocating motion along the axis. When the tightening shaft is reversed, under the action of the S-shaped direction-changing driving surface, the contact surface gap between the docking section mandrel and the push rod section mandrel gradually decreases, and under the action of the reset spring, the end face of the stud bolt is separated from the push rod section mandrel, so that the bite force between the second screw sleeve and the stud bolt is fully released, and it is not easy to pull out the stud bolt.

[0017] 2) In this case, a stud bolt tightening tool is provided, in which the end of the mandrel of the push rod section that contacts the stud bolt is provided with a ball head. The contact area between the mandrel of the push rod section and the stud bolt is small, and the friction force is small, which is conducive to the stud bolt being separated from the second screw sleeve.

[0018] In order to more clearly understand the present invention, the following will describe the preferred implementation modes of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a reference diagram of the use state of the utility model;

[0020] Figure 2 It is a three-dimensional diagram of the utility model;

[0021] Figure 3 It is a cross-sectional view of the utility model;

[0022] Figure 4 It is an exploded view of the utility model;

[0023] Figure 5 It is a schematic diagram of the structure of the mandrel of the utility model.

[0024] Figure ID:

[0025] 1-two-section mandrel, 2-first screw sleeve, 3-second screw sleeve, 4-reset spring, 5-limit pin; 11-docking section mandrel, 12-top rod section mandrel, 13-S-shaped changing driving surface; 111-docking interface, 112-docking pin; 121-limiting convex ring, 122-waist-shaped limiting hole; 21-first assembly hole, 22-circular limiting hole; 31-limiting step; 100-stud bolt tightening tool, 200-stud bolt. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing 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. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In addition, if there are terms such as "first" and "second", they are only used for descriptive purposes, mainly to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components, and cannot be understood as indicating or implying relative importance.

[0028] In addition, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components; for ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0029] See also Figure 1-5 The utility model provides a stud bolt tightening tool 100, including a coaxially arranged two-section core shaft 1, a first screw sleeve 2 sleeved on the first end of the core shaft 1, a second screw sleeve 3 sleeved on the second end of the core shaft 1, a return spring 4 sleeved on the core shaft 1 and located in the second screw sleeve 3, and a limit pin 5 which passes through the first screw sleeve 2 and the core shaft 1 in the same position in the transverse direction.

[0030] The two-section core shaft 1 comprises a docking section core shaft 11 and a push rod section core shaft 12. The contact surfaces of the docking section core shaft 11 and the push rod section core shaft 12 are mutually matching concave and convex S-shaped changing driving surfaces 13, so that when the docking section core shaft 11 rotates in the circumferential direction, the push rod section core shaft 12 can be driven to perform axial linear reciprocating motion along the axial direction.

[0031] Furthermore, a docking port 111 is provided on the end surface where the docking section core shaft 11 and the tightening shaft are docked, and a docking pin 112 is provided through the side wall of the docking port 111. The docking section core shaft 11 is installed on the tightening shaft (not shown) through the cooperation of the docking port 111, the docking pin 112 and the tightening shaft, and follows the tightening shaft to rotate forward or reverse.

[0032] Furthermore, the outer wall of the push rod section core shaft 12 is protruded with a limiting convex ring 121, and the limiting convex ring 121 is used to limit the reset spring 4; a waist-shaped limiting hole 122 is transversely penetrated on the push rod section core shaft 12 at the position of the limiting convex ring 121, and the waist-shaped limiting hole 122 corresponds to the circular limiting hole 22 opened on the side wall of the first screw sleeve 2, so that the limiting pin 5 can be assembled in the circular limiting hole 22 of the first screw sleeve 2 and the waist-shaped limiting hole 122 of the push rod section core shaft 12, and the axial linear reciprocating motion stroke of the push rod section core shaft 12 is limited by the limiting pin 5.

[0033] The first screw sleeve 2 has a first assembly hole 21 on its top, and the first assembly hole 21 is for the docking section core shaft 11 to pass through and dock with the tightening shaft; a circular limiting hole 22 is provided on the side wall of the first screw sleeve 2 and corresponds to the waist-shaped limiting hole 122 of the top rod section core shaft 12; the first screw sleeve 2 is provided with an internal thread and is threadedly connected with the external thread on the second screw sleeve 3.

[0034] The second screw sleeve 3 has an external thread at one end which is threadedly connected with the internal thread of the first screw sleeve 2; a limiting step 31 is provided in the inner cavity of the second screw sleeve 3 corresponding to the limiting convex ring 121 of the core shaft 12 of the push rod section, so that one end of the reset spring 4 abuts against the limiting convex ring 121 of the core shaft 12 of the push rod section, and the other end abuts against the limiting step 31 in the second screw sleeve 3, so that under the action of the reset spring 4, the core shaft 12 of the push rod section can make axial linear reciprocating motion in the first screw sleeve 2 and the second screw sleeve 3, and the core shaft 12 of the push rod section is limited by the length of the waist-shaped limiting hole 122 when making axial linear reciprocating motion.

[0035] The return spring 4 is arranged in the inner cavity of the second screw sleeve 3 and sleeved on the mandrel 12 of the push rod segment.

[0036] The limiting pin 5 passes through the circular limiting hole 22 on the first screw sleeve 2 and penetrates the waist-shaped limiting hole 122 of the mandrel 12 of the push rod segment.

[0037] Preferably, in this embodiment, the end of the top rod section core shaft 12 that contacts the stud bolt 200 is provided with a ball head to reduce the contact area between the top rod section core shaft 12 and the stud bolt 200, reduce friction, and facilitate the stud bolt 200 to disengage from the second screw sleeve 3.

[0038] Working principle and workflow:

[0039] 1. The docking section mandrel 11 docks with the tightening shaft and follows the tightening shaft to rotate forward or reverse;

[0040] 2. When the tightening shaft rotates forward, since the contact surfaces of the docking section mandrel 11 and the mandrel 12 of the push rod section are the S-shaped undulating driving surfaces 13 that match each other, when the docking section mandrel 11 rotates forward in the circumferential direction, the gap between the contact surfaces of the docking section mandrel 11 and the mandrel 12 of the push rod section becomes larger, thereby prompting the mandrel 12 of the push rod section to move downward in an axial straight line along the axial direction;

[0041] 3. The tightening shaft continues to rotate forward, one end of the stud bolt 200 is screwed into the second sleeve and supported by the mandrel 12 of the push rod section, and the other end of the stud bolt 200 is screwed into the corresponding screw hole of the product;

[0042] 4. When the tightening shaft reverses, under the action of the S-shaped deflection driving surface 13, the contact surface gap between the butt section mandrel 11 and the mandrel 12 of the push rod section gradually decreases. Under the action of the reset spring 4, the end face of the stud bolt 200 is separated from the mandrel 12 of the push rod section, releasing the bite force;

[0043] 5. The tightening shaft continues to reverse until the second sleeve withdraws from the stud bolt 200, and the stud bolt 200 is assembled on the product.

[0044] Compared with the prior art, the present invention provides a stud bolt tightening tool with a coaxial two-section mandrel, which includes a docking section mandrel and a mandrel for the top rod section. The contact surfaces of the docking section mandrel and the mandrel for the top rod section are mutually matched concave and convex S-shaped direction-changing driving surfaces, so that when the docking section mandrel rotates in the circumferential direction, the mandrel for the top rod section can be driven to perform axial linear reciprocating motion along the axial direction. This allows the bite force between the second screw sleeve and the stud bolt to be fully released, and it is not easy to bring out the stud bolt.

[0045] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A stud bolt tightening tool, characterized in that: The invention comprises a coaxially arranged two-section mandrel (1), a first screw sleeve (2) sleeved on the first end of the mandrel (1), a second screw sleeve (3) sleeved on the second end of the mandrel (1), a return spring (4) sleeved on the mandrel (1) and located in the second screw sleeve (3), and a stop pin (5) which passes through the first screw sleeve (2) and the mandrel (1) in the same position in the transverse direction; The two-section mandrel (1) comprises a docking section mandrel (11) and a push rod section mandrel (12); the contact surfaces of the docking section mandrel (11) and the push rod section mandrel (12) are mutually matching concave and convex S-shaped direction-changing driving surfaces (13).

2. A stud bolt tightening tool according to claim 1, characterized in that: A limiting convex ring (121) is protruding from the outer wall of the mandrel section (12); a waist-shaped limiting hole (122) is transversely penetrated through the mandrel section (12) at the position of the limiting convex ring (121), and the waist-shaped limiting hole (122) corresponds to the circular limiting hole (22) provided on the side wall of the first screw sleeve (2).

3. A stud bolt tightening tool according to claim 2, characterized in that: The first screw sleeve (2) has a first assembly hole (21) on the top for the docking section mandrel (11) to pass through and dock with the tightening shaft; a circular limiting hole (22) is provided on the side wall of the first screw sleeve (2) to correspond to the waist-shaped limiting hole (122) of the mandrel (12) of the push rod section; and the first screw sleeve (2) is provided with an internal thread to be threadedly connected with the external thread on the second screw sleeve (3).

4. A stud bolt tightening tool according to claim 3, characterized in that: A limiting step (31) is arranged in the inner cavity of the second screw sleeve (3) and corresponds to the limiting convex ring (121) of the mandrel (12) of the push rod section, so that one end of the return spring (4) abuts against the limiting convex ring (121) of the mandrel (12) of the push rod section, and the other end abuts against the limiting step (31) in the second screw sleeve (3).

5. A stud bolt tightening tool according to claim 4, characterized in that: The limiting pin (5) passes through the circular limiting hole (22) on the first screw sleeve (2) and penetrates the waist-shaped limiting hole (122) of the mandrel (12) of the top rod section.

6. A stud bolt tightening tool according to claim 1, characterized in that: A docking port (111) is provided on the end surface of the docking section core shaft (11) for docking with the tightening shaft, and a docking pin (112) is provided through the side wall of the docking port (111).

7. A stud bolt tightening tool according to claim 1, characterized in that: The end of the mandrel (12) of the top rod section that contacts the stud bolt (200) is provided with a ball head.

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