Stud tightening head

Abstract

The utility model provides a double-end stud tightening head which is characterized in that a shell is in threaded connection with a multi-thread screw, the lower end of the shell is provided with a limiting sleeve, an ejector rod is slidably connected in the limiting sleeve, the lower end of the limiting sleeve can be in threaded connection to the periphery of one end of a double-end stud, and an external screwing tool can drive the multi-thread screw to rotate relatively. The multi-thread screw rotating relatively can slide in the axial direction relative to the shell, and the lower end of the multi-thread screw sliding in the axial direction drives the ejector rod to abut against the upper end of the double-end stud. According to the tightening head of the double-end stud, after installation is completed and the multi-thread screw is rotated reversely, the multi-thread screw firstly relieves abutting connection with the double-end stud, the force of the multi-thread screw and the force of a shell do not act on the double-end stud, then the shell and the double-end stud can be disassembled, the installation process is simple, and when the shell is disassembled, the shell can be disassembled conveniently and rapidly. And reverse rotation of the double-end stud cannot be caused, so that the screwing depth or torque of the double-end stud is guaranteed, and the production quality is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the field of intelligent equipment, and particularly relates to a double-headed stud tightening head. Background Art

[0002] As a common standard part in current mechanical equipment and assembly, the double-headed stud is characterized in that both ends are threaded but there is no position for the fastening tool to act, so a special assembly tool is required for the assembly of the double-headed stud. In the prior art, the commonly used double-headed stud tightening head is generally a sleeve. The deficiencies of this type of tightening head are mainly as follows:

[0003] First, this tightening head can only be used to release after the double-headed stud is tightened to the torque, and cannot be used to release after being tightened to a certain depth.

[0004] Second, the existing sleeves for tightening double-headed studs are large in size and single in size, and cannot be directly used in automated equipment.

[0005] Third, the pressing column inside the sleeve uses a completely fixed or arc-shaped rotating groove to drive the telescopic pressing method. This method cannot release the pressing force in time when the tightening head is loosened, and may drive the already tightened double-headed stud to rotate, thus affecting the tightening torque. Summary of the Invention

[0006] In view of this, the utility model aims to propose a double-headed stud tightening head to solve at least one of the above-mentioned prior art problems.

[0007] To achieve the above object, the technical solution of the utility model is realized as follows:

[0008] A double-headed stud tightening head includes a multi-headed screw, a housing, a limit sleeve and a push rod. The multi-headed screw is threadedly connected to the housing, and the end of the multi-headed screw can be connected to an external screwing tool. A limit sleeve is arranged at the lower end of the housing, and the push rod is slidably connected inside the limit sleeve. The lower end of the limit sleeve can be threadedly connected to the periphery of one end of the double-headed stud. The external screwing tool can drive the multi-headed screw to rotate relatively. The relatively rotating multi-headed screw can slide axially relative to the housing, and the lower end of the axially sliding multi-headed screw drives the push rod to abut against the upper end of the double-headed stud.

[0009] Further, an inner sleeve is sleeved inside the housing. The inner sleeve is provided with an internal thread, and the outer periphery of the multi-headed screw is threadedly connected to the inner circle of the inner sleeve.

[0010] Further, an end cover is arranged on the inner circle at the upper end of the housing. The multi-headed screw is located inside the inner circle of the end cover. A floating space is provided between the lower end of the end cover and the upper end of the inner sleeve. A limit rod is arranged on the outer periphery of the multi-headed screw. The limit rod is located in the floating space, and the outer periphery of the limit rod can abut against the lower end of the end cover.

[0011] Further, a lower sleeve is installed at the lower end of the outer shell, and a limiting sleeve is detachably installed on the inner ring of the lower sleeve.

[0012] Further, the cross-section of the ejector rod is a T-shaped structure. The upper end of the ejector rod can be clamped to the upper end of the limiting sleeve, and the lower end of the ejector rod is located inside the limiting sleeve.

[0013] Further, a lower top bead is arranged at the lower end of the ejector rod, and an upper top bead is arranged between the upper end of the ejector rod and the lower end of the multi-head screw.

[0014] Compared with the prior art, the double-headed stud tightening head of the present invention has the following beneficial effects:

[0015] (1) For the double-headed stud tightening head of the present invention, when in use, the double-headed stud is threadedly connected to the lower end of the limiting sleeve, and the lower end of the double-headed stud is aligned with the installation position to be installed. An external screwing tool is used to drive the multi-head screw to rotate. If the multi-head screw rotates relative to the outer shell, the lower end of the multi-head screw gradually abuts against the upper end of the double-headed stud. As the multi-head screw and the double-headed stud are gradually tightened, the multi-head screw drives the outer shell and the double-headed stud to rotate synchronously to complete the installation of the double-headed stud. After the installation is completed, the multi-head screw is rotated in the reverse direction. The multi-head screw first disengages from the double-headed stud, and the forces of the multi-head screw and the outer shell do not act on the double-headed stud, so that the disassembly of the outer shell and the double-headed stud can be completed. The installation process is simple, and when the outer shell is removed, the double-headed stud will not rotate in the reverse direction, so as to ensure the screwing depth or torque of the double-headed stud and ensure the production quality.

[0016] (2) For the double-headed stud tightening head of the present invention, under the condition of screwing the multi-head screw in the reverse direction, the limiting rod is used to limit the displacement of the multi-head screw in the axial direction. When the multi-head screw is rotated in the reverse direction, since the ejector rod is in contact with the double-headed stud in the initial state, the multi-head screw first rotates relative to the outer shell, and the ejector rod disengages from the double-headed stud. At this time, the multi-head screw continues to move. When the limiting rod abuts against the end cover, the multi-head screw and the outer shell rotate synchronously, and the outer shell gradually disengages from the double-headed stud. During the process, the multi-head screw is always connected to the outer shell to prevent the multi-head screw from disengaging from the outer shell and improve work efficiency.

[0017] (3) For the double-headed stud tightening head of the present invention, a lower top bead is arranged at the lower end of the ejector rod, and an upper top bead is arranged between the upper end of the ejector rod and the lower end of the multi-head screw. Both the upper top bead and the lower top bead are used to reduce the abutting surface, so as to reduce the deformation of the parts, improve the production quality, and facilitate the release of the abutting state. Description of the Drawings

[0018] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0019] Figure 1 Schematic structural diagram of a double - headed stud tightening head according to an embodiment of the present utility model;

[0020] Figure 2 Schematic sectional view of a double - headed stud tightening head according to an embodiment of the present utility model;

[0021] Figure 3 Exploded structural diagram of a double - headed stud tightening head according to an embodiment of the present utility model;

[0022] Figure 4 Schematic sectional view of a double - headed stud tightening head pressing against a double - headed stud according to an embodiment of the present utility model.

[0023] Explanation of reference numerals:

[0024] 1 - multi - headed screw; 2 - outer shell; 3 - end cap; 4 - limiting rod; 5 - inner sleeve; 6 - upper top bead; 7 - lower sleeve; 8 - ejector rod; 9 - limiting sleeve; 10 - lower top bead; 11 - double - headed stud. Detailed implementation manners

[0025] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0026] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 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 communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

[0028] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0029] As Figures 1-4 shown, a stud tightening head includes a multi-headed screw 1, a housing 2, a limiting sleeve 9, and a push rod 8. The multi-headed screw 1 is threadedly connected to the housing 2, and the end of the multi-headed screw 1 can be connected to an external screwing tool. A limiting sleeve 9 is provided at the lower end of the housing 2, and the push rod 8 is slidably connected inside the limiting sleeve 9. The lower end of the limiting sleeve 9 can be threadedly connected to the periphery of one end of a stud 11. The external screwing tool can drive the multi-headed screw 1 to rotate relatively. The relatively rotating multi-headed screw 1 can slide axially relative to the housing 2. The lower end of the axially sliding multi-headed screw 1 drives the push rod 8 to abut against the upper end of the stud 11. When in use, the stud 11 is threadedly connected to the lower end of the limiting sleeve 9, and the lower end of the stud 11 is aligned with the installation position to be installed. The external screwing tool drives the multi-headed screw 1 to rotate. If the multi-headed screw 1 rotates relative to the housing 2, the lower end of the multi-headed screw 1 drives the push rod 8 to gradually abut against the upper end of the stud 11. As the push rod 8 and the stud 11 are gradually tightened, the multi-headed screw 1 drives the housing 2 and the stud 11 to rotate synchronously to complete the installation of the stud 11. After the installation is completed, rotate the multi-headed screw 1 in the reverse direction. The push rod 8 first releases the abutment with the stud 11, and the forces of the multi-headed screw 1 and the housing 2 do not act on the stud 11, that is, the disassembly of the housing 2 and the stud 11 can be completed. The installation process is simple, and when the housing 2 is removed, it will not cause the reverse rotation of the stud 11, so as to ensure the screwing depth or torque of the stud 11 and ensure the production quality.

[0030] As Figure 2As shown, an inner sleeve 5 is provided inside the outer shell 2. The inner sleeve 5 is provided with internal threads, and the external threads of the multi-headed screw 1 are threadedly connected to the inner circle of the inner sleeve 5. A end cover 3 is arranged on the inner circle at the upper end of the outer shell 2. The multi-headed screw 1 is located inside the inner circle of the end cover 3, and there is a floating space between the lower end of the end cover 3 and the upper end of the inner sleeve 5. A limiting rod 4 is arranged on the periphery of the multi-headed screw 1. The limiting rod 4 is located in the floating space, and the periphery of the limiting rod 4 can abut against the lower end of the end cover 3. Under the condition of screwing the multi-headed screw 1 in one direction, the limiting rod 4 is used to limit the displacement of the axial sliding of the multi-headed screw 1. When the multi-headed screw is rotated in the reverse direction, because the ejector rod 8 is in a state of abutting against the double-headed stud 11 in the initial state, the multi-headed screw 1 first rotates relative to the outer shell 2, and the ejector rod 8 releases the abutment with the double-headed stud 11. At this time, the multi-headed screw 1 continues to move. When the limiting rod 4 abuts against the end cover 3, the multi-headed screw 1 rotates synchronously with the outer shell 2, and the outer shell 2 is gradually disconnected from the double-headed stud 11. During this process, the multi-headed screw 1 is always connected to the outer shell 2 to prevent the multi-headed screw 1 from detaching from the outer shell 2 and improve work efficiency.

[0031] The lower end of the outer shell 2 is installed with a lower sleeve 7, and a limiting sleeve 9 is detachably installed inside the inner circle of the lower sleeve 7. When matching double-headed studs 11 of different specifications, the adaptation of the device can be completed by replacing the specifications of the limiting sleeve 9, so as to improve the versatility of the device.

[0032] As Figure 4 shown, the cross-section of the ejector rod 8 is a T-shaped structure. The upper end of the ejector rod 8 can be clamped to the upper end of the limiting sleeve 9. The lower end of the ejector rod 8 is located inside the limiting sleeve 9. A lower top bead 10 is arranged at the lower end of the ejector rod 8, and an upper top bead 6 is arranged between the upper end of the ejector rod 8 and the lower end of the multi-headed screw 1. Both the upper top bead 6 and the lower top bead 10 are used to reduce the abutting surface, so as to reduce the deformation of the parts, improve the production quality, and facilitate the release of the abutting state.

[0033] The working process of a double-headed stud tightening head:

[0034] Install the multi-headed screw 1 onto the tightening tool. The limiting sleeve 9 contacts the double-headed stud 11. At this time, when the multi-headed screw 1 rotates clockwise, the double-headed stud 11 is screwed into the limiting sleeve 9. Since the tightening friction of the double-headed stud 11 is greater than that of the internal multi-headed nut, when screwing in, the internal multi-headed stud rotates first and extends to push the internal ejector rod 8 to tighten the double-headed stud 11. Subsequently, the multi-headed screw 1 drives the double-headed stud 11 and screws it into the product that needs to install the double-headed stud 11. After the double-headed stud 11 is tightened, the multi-headed screw 1 rotates counterclockwise. At this time, the multi-headed screw 1 rotates first to release the ejector post. As the multi-headed screw 1 continues to rotate, it finally disengages from the double-headed stud 11.

[0035] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A double-ended stud tightening head, characterized in that: The invention comprises a multi-threaded screw (1), an outer shell (2), a limiting sleeve (9) and a push rod (8); the outer shell (2) is threadedly connected to the multi-threaded screw (1); the end of the multi-threaded screw (1) can be connected to an external screwing tool; a limiting sleeve (9) is arranged at the lower end of the outer shell (2); the push rod (8) is slidably connected inside the limiting sleeve (9); the lower end of the limiting sleeve (9) can be threadedly connected to the outer periphery of one end of a stud; the external screwing tool can drive the multi-threaded screw (1) to rotate relatively; the multi-threaded screw (1) that rotates relatively can slide axially relative to the outer shell (2); the lower end of the axially sliding multi-threaded screw (1) drives the push rod (8) to abut against the upper end of the stud (11).

2. A stud bolt tightening head according to claim 1, characterized in that: The outer shell (2) is provided with an inner sleeve (5), the inner sleeve (5) is provided with an internal thread, and the outer peripheral thread of the multi-thread screw (1) is connected to the inner ring of the inner sleeve (5).

3. A stud bolt tightening head according to claim 2, characterized in that: An end cover (3) is arranged on the inner ring of the upper end of the outer shell (2), the multi-threaded screw (1) is located on the inner ring of the end cover (3), and a floating space is arranged between the lower end of the end cover (3) and the upper end of the inner sleeve (5), and a limiting rod (4) is arranged on the periphery of the multi-threaded screw (1), the limiting rod (4) is located in the floating space, and the periphery of the limiting rod (4) can abut against the lower end of the end cover (3).

4. A stud bolt tightening head according to claim 1, characterized in that: A lower sleeve (7) is installed at the lower end of the outer shell (2), and a limiting sleeve (9) is detachably installed on the inner ring of the lower sleeve (7).

5. A stud bolt tightening head according to claim 1, characterized in that: The cross section of the push rod (8) is a T-shaped structure. The upper end of the push rod (8) can be snap-connected to the upper end of the limiting sleeve (9), and the lower end of the push rod (8) is located in the limiting sleeve (9).

6. A stud bolt tightening head according to claim 1, characterized in that: A lower ejector ball (10) is arranged at the lower end of the ejector rod (8), and an upper ejector ball (6) is arranged between the upper end of the ejector rod (8) and the lower end of the multi-threaded screw rod (1).

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