Pin shaft pulling device

Abstract

A pin shaft pulling device belongs to the technical field of building construction equipment, can solve the problem that the dismounting process of a pin shaft installed in a steel truss structure is time-consuming and labor-consuming, and comprises a telescopic device and a supporting seat, the telescopic device comprises a screw rod, one end of the screw rod is in threaded connection with a nut, and the other end of the screw rod is provided with a clamping mechanism; the clamping mechanism comprises a circular chuck body, a through hole is formed in the center of the chuck body, a screw penetrates through the through hole to be connected with the chuck body, three sliding grooves are formed in the surface of the chuck body at equal intervals, movable clamping jaws are arranged in the sliding grooves, and a driving mechanism is arranged at the bottoms of the movable clamping jaws. By using the device, the pin shaft can be conveniently detached from the steel truss, and time and labor are saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction equipment, and in particular relates to a pin shaft pulling device. Background Art

[0002] At present, modularization and lightness have become important considerations in the production and installation process of steel trusses. Specifically, the steel trusses are divided into multiple parts, each of which is processed and manufactured separately in the factory, and then installed on site by bolts or pins. Among them, each connection position generally requires one or two pins, but if bolts are used, at least 6 bolts (generally reamed hole bolts) are required for connection. Therefore, compared with multiple bolts, pin connections are more convenient and easier to install on site.

[0003] The pin generally includes a shaft body, one end of which is provided with a shoulder portion, and the other end of the shaft body is provided with a radial through hole. The shoulder portion is used for limiting the position, so as to restrict the pin from being separated from the steel truss structure from one end of the radial through hole when in use. When in use, a cotter pin is passed through the radial through hole, and the cotter pin is used to restrict the pin, so as to prevent the pin from being separated from the steel truss structure from one end of the shoulder portion when in use. When disassembling, a tool is required to forcefully knock the pin from the end of the pin away from the shoulder portion, which makes the pin more difficult to disassemble than the bolt.

[0004] At present, with the development of industrialization, steel truss structures are becoming more and more complex. In this case, the pins are generally installed from the outside to the inside of the steel truss structure. However, when removing the pins, many components in the steel truss structure will restrict the installers from applying reverse force to the insertion end of the pins, making the process of removing the pins time-consuming and laborious. Utility Model Content

[0005] The utility model provides a pin shaft pulling device to solve the problem that the removal process of a pin shaft installed in a steel truss structure is time-consuming and labor-intensive.

[0006] The utility model adopts the following technical solutions:

[0007] A pin shaft pulling device includes a telescopic device and a support seat, the telescopic device includes a screw rod, one end of the screw rod is threadedly connected to a nut, the other end of the screw rod is provided with a clamping mechanism, the clamping mechanism includes a circular chuck body, the center of the chuck body is provided with a through hole, the screw rod passes through the through hole and is connected to the chuck body, three sliding grooves are provided at equal intervals on the surface of the chuck body, a movable claw is provided in the sliding groove, and a driving mechanism is provided at the bottom of the movable claw.

[0008] Furthermore, the support seat includes a circular support plate, a through hole is provided in the center of the support plate, a screw passes through the through hole and is fixed by a nut, three legs are provided at equal intervals on the edge of the support plate, the legs are parallel to the screw, a magnet is provided at the cantilever end of the legs, and the legs are arranged at intervals from the movable claws.

[0009] Furthermore, the cross-section of the movable jaw is stepped, grooves matching the slide grooves on the surface of the chuck body are provided on both sides of the movable jaw, a plurality of arc-shaped tooth grooves are provided at the bottom of the movable jaw, and a boss is provided at one end of the movable jaw facing the center of the chuck body.

[0010] Furthermore, the cantilever end of the boss is provided with an inwardly concave arc-shaped cylindrical surface, a chamfered surface is provided between the side of the boss close to the telescopic device and the inwardly concave arc-shaped cylindrical surface, an angle A is provided between the chamfered surface and the side of the boss close to the telescopic device, 10°≤A≤25°, and the width of the boss at the bottom of the chamfered surface is B, 2.5mm≤B≤8mm.

[0011] Furthermore, the driving mechanism includes a bevel gear, which is located on the inner side of the chuck body. One side of the bevel gear is provided with a disc gear that meshes with the bevel gear. The other end of the disc gear is provided with an annular plane threaded portion from the center to the edge, and the annular plane threaded portion cooperates with the arc-shaped tooth groove of the movable claw.

[0012] Furthermore, the end face of the bevel gear is provided with a square hole, and the surface of the chuck body is provided with an opening corresponding to the square hole.

[0013] The beneficial effects of the utility model are as follows:

[0014] When in use, the boss is close to the side of the telescopic device and abutted and fixed against the steel truss structure, and then the boss at the end of the movable claw is moved between the shaft shoulder and the steel truss structure, and the movable claw is fixed relative to the chuck body, and then the telescopic device drives the clamping mechanism to move along the length direction of the telescopic device relative to the side of the telescopic device close to the boss, so that the clamping mechanism drives the pin shaft to gradually separate from the steel truss structure, so as to complete the removal of the pin shaft from the steel truss structure.

[0015] By using the utility model, the pin shaft can be conveniently removed from the steel truss, saving time and labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the planar structure of the utility model;

[0018] Figure 3 is a schematic diagram of the structure of the driving mechanism;

[0019] Figure 4 It is a three-dimensional structural schematic diagram of the movable claw;

[0020] Figure 5 It is a schematic diagram of the planar structure of the movable claw;

[0021] Figure 6for Figure 4 A partial enlarged view of

[0022] Figure 7 for Figure 5 A partial enlarged view of

[0023] Figure 8 It is a schematic diagram of the connection between the telescopic device and the clamping mechanism;

[0024] Fig. 9 It is a schematic diagram of the planar structure of the support seat;

[0025] Fig.10 It is a schematic diagram of the pin structure;

[0026] Fig.11 This is a schematic diagram of the use status of the utility model. Figure 1 ;

[0027] Fig.12 This is a schematic diagram of the use status of the utility model. Figure 2 ;

[0028] Fig.13 It is a structural schematic diagram of the annular plane threaded portion;

[0029] Among them: 1-screw; 2-nut; 3-chuck body; 4-movable claw; 5-support plate; 6-leg; 7-magnet; 8-groove; 9-arc-shaped tooth groove; 10-boss; 11-concave arc-shaped cylinder; 12-chamfered surface; 13-side; 14-bevel gear; 15-disc gear; 16-annular plane threaded part; 17-square hole; 18-shaft body; 19-shaft shoulder; 20-radial through hole; 21-steel truss structure. DETAILED DESCRIPTION

[0030] The utility model is further described with reference to the accompanying drawings.

[0031] As shown in the figure, a pin shaft pulling device includes a telescopic device and a support seat, wherein the telescopic device includes a screw rod 1, one end of the screw rod 1 is threadedly connected with a nut 2, and the other end of the screw rod 1 is provided with a clamping mechanism, and the telescopic device can drive the clamping mechanism to move relative to the support seat along the length direction of the telescopic device. The screw rod 1 is coaxially arranged with the pin shaft.

[0032] The clamping mechanism includes a circular chuck body 3, a through hole is provided in the center of the chuck body 3, a screw rod 1 passes through the through hole and is connected to the chuck body 3, three slide grooves are provided at equal intervals on the surface of the chuck body 3, a movable claw 4 is provided in the slide groove, and a driving mechanism is provided at the bottom of the movable claw 4.

[0033] In the radial direction along the annular arrangement of the movable jaws 4 , the movable jaws 4 can move relative to the chuck body 3 , and the movable jaws 4 can be fixed relative to the chuck body 3 .

[0034] The support seat includes a circular support plate 5, the center of which is provided with a through hole, through which a screw rod 1 passes and is fixed by a nut 2, and three legs 6 are provided at equal intervals on the edge of the support plate 5, the legs 6 are parallel to the screw rod 1, and magnets 7 are provided at the cantilever ends of the legs 6, and the legs 6 are arranged at intervals with the movable claws 4. The magnets 7 can be temporarily connected to the steel truss structure 21 by magnetic attraction to reduce the number of operators. The side of the legs 6 can limit the movable claws 4.

[0035] The cross section of the movable jaw 4 is stepped, and grooves matching the slide grooves on the surface of the chuck body 3 are provided on both sides of the movable jaw 4, a plurality of arc-shaped tooth grooves 9 are provided at the bottom of the movable jaw 4, and a boss 10 is provided at one end of the movable jaw 4 facing the center of the chuck body 3.

[0036] The cantilever end of the boss 10 is provided with an inwardly concave arc-shaped cylindrical surface 11, and a chamfered surface 12 is provided between the side 13 of the boss 10 close to the telescopic device and the inwardly concave arc-shaped cylindrical surface 11. An angle A is provided between the chamfered surface 12 and the side 13 of the boss 10 close to the telescopic device, 10°≤A≤25°, and the width of the boss 10 at the bottom of the chamfered surface 12 is B, 2.5mm≤B≤8mm.

[0037] The driving mechanism includes a bevel gear 14, which is located inside the chuck body 3. One side of the bevel gear 14 is provided with a disc gear 15 meshing with the bevel gear 14, and the other end of the disc gear 15 is provided with an annular plane threaded portion 16 extending from the center to the edge. Fig.13 As shown, the annular plane threaded portion 16 is distributed in a spiral line from inside to outside, and the annular plane threaded portion 16 matches the arc-shaped tooth groove 9 of the movable claw 4.

[0038] Furthermore, a square hole 17 is provided on the end surface of the bevel gear 14 , and an opening corresponding to the square hole 17 is provided on the surface of the chuck body 3 .

[0039] When the bevel gear 14 is rotated through the square hole 17 with a spanner, the bevel gear 14 drives the disc gear 15 to rotate, and the annular plane threaded portion 16 on the back of the disc gear 15 simultaneously drives the three movable claws 4 to move closer to or away from the center. When the boss 10 reaches the position between the shaft shoulder 19 and the steel truss structure 21, the spanner is disengaged, and the clamping mechanism relies on the reverse self-locking performance formed by the bevel gear 14 and the disc gear 15, as well as the annular plane threaded portion 16 and the arc-shaped tooth groove 9 to achieve the relative fixation of the movable claws 4 relative to the chuck body 3.

[0040] The method of using the utility model is as follows:

[0041] When in use, the support seat is abutted and fixed against the steel truss structure 21, and then the boss 10 at the end of the movable claw 4 is moved between the shaft shoulder 19 and the steel truss structure 21, and the movable claw 4 is relatively fixed relative to the chuck body 3, and then the telescopic device is used to drive the clamping mechanism to move relative to the support seat along the length direction of the telescopic device, so that the clamping mechanism drives the pin shaft to gradually separate from the steel truss structure 21, so as to complete the removal of the pin shaft from the steel truss structure 21.

[0042] In order to make the above-mentioned pin pulling device more convenient to use, when the pin is installed, a certain gap needs to be left between the shaft shoulder 19 and the steel truss structure 21. It is recommended that the gap should be no less than 2.5 mm and no more than 8 mm. If the gap is too small, a thinner boss will be required. This may result in the boss being unable to apply sufficient thrust to the shaft shoulder to resist the friction between the pin and the steel truss structure. If the gap is too large, it will cause waste of pin material.

Claims

1. A pin pulling device, characterized in that: The invention comprises a telescopic device and a support seat, wherein the telescopic device comprises a screw rod (1), one end of the screw rod (1) is threadedly connected to a nut (2), the other end of the screw rod (1) is provided with a clamping mechanism, the clamping mechanism comprises a circular chuck body (3), a through hole is provided at the center of the chuck body (3), the screw rod (1) passes through the through hole and is connected to the chuck body (3), three slide grooves are provided at equal intervals on the surface of the chuck body (3), a movable claw (4) is provided in the slide groove, and a driving mechanism is provided at the bottom of the movable claw (4).

2. A pin pulling device according to claim 1, characterized in that: The support seat comprises a circular support plate (5), the center of the support plate (5) is provided with a through hole, the screw rod (1) passes through the through hole and is fixed by a nut (2), three legs (6) are provided at equal intervals on the edge of the support plate (5), the legs (6) are parallel to the screw rod (1), a magnet (7) is provided at the cantilever end of the leg (6), and the leg (6) and the movable claw (4) are arranged at intervals.

3. A pin pulling device according to claim 1, characterized in that: The cross section of the movable clamping jaw (4) is stepped, grooves (8) matching the slide grooves on the surface of the chuck body (3) are provided on both sides of the movable clamping jaw (4), a plurality of arc-shaped tooth grooves (9) are provided at the bottom of the movable clamping jaw (4), and a boss (10) is provided at one end of the movable clamping jaw (4) facing the center of the chuck body (3).

4. A pin pulling device according to claim 3, characterized in that: The cantilever end of the boss (10) is provided with an inwardly concave arc-shaped cylindrical surface (11), a chamfered surface (12) is provided between the side surface (13) of the boss (10) close to the telescopic device and the inwardly concave arc-shaped cylindrical surface (11), an angle A is provided between the chamfered surface (12) and the side surface (13) of the boss (10) close to the telescopic device, 10°≤A≤25°, and the width of the boss (10) at the bottom of the chamfered surface (12) is B, 2.5mm≤B≤8mm.

5. A pin pulling device according to claim 4, characterized in that: The driving mechanism comprises a bevel gear (14), the bevel gear (14) being located on the inner side of the chuck body (3), a disc gear (15) meshing with the bevel gear (14) being provided on one side of the bevel gear (14), and an annular plane threaded portion (16) extending from the center to the edge being provided on the other end of the disc gear (15), the annular plane threaded portion (16) being matched with an arc-shaped tooth groove (9) of the movable claw (4).

6. A pin pulling device according to claim 5, characterized in that: The end surface of the bevel gear (14) is provided with a square hole (17), and the surface of the chuck body (3) is provided with an opening corresponding to the square hole (17).

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