Screw tightening device capable of preventing screw from being taken up

Abstract

The screw tightening device comprises a handle, a driving motor is fixedly connected to the inner wall of the handle, a driving shaft is fixedly connected to an output shaft of the driving motor through a coupler, a protection block is fixedly connected to the outer wall of the bottom of the driving shaft, and the protection block is fixedly connected to the outer wall of the bottom of the driving shaft. The driving shaft is of a hollow structure, an electric push rod is fixedly connected to the inner wall of the top of the driving shaft, a sleeve is fixedly connected to the bottom of the movable end of the electric push rod, and a supporting frame is fixedly connected to the bottom of the sleeve. And the connecting frame can slide downwards continuously under the condition that the workpiece is positioned, so that the connecting frame drives the screwdriver head to retract and then is separated from a screw mounted on the workpiece, and the problem that the mounting working precision is affected due to the fact that the workpiece is easily driven by the screw to deviate when the screwdriver head is separated is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical device technical direction, concretely relates to a screw tightening device of preventing screw from being taken up. BACKGROUND

[0002] Screw is a kind of common fastener, is widely used in machinery, electrical apparatus and building etc. field, it is a kind of physical and mathematical principle using the inclined plane circular rotation and friction of object, gradually tightens the tool of machine parts, it is fixed together by screw mechanism two or more objects, need to use the screwdriver device when installing screw.

[0003] The existing screwdriver device is easy to take up screw after installing screw, so that the object needing to be fixed is offset, and then the precision of screw installation is reduced, which causes inconvenience to people's use. This phenomenon becomes a problem to be solved by the personnel in the field. CONTENT OF THE UTILITY MODEL

[0004] The utility model is directed to the existing technology and proposes a screw tightening device for preventing screw from being taken up to solve the problems in the background.

[0005] In order to solve the above technical problems, the utility model provides technical scheme as follows: A kind of screw tightening device for preventing screw from being taken up, including handle, the inner wall of the handle is fixedly connected with driving motor, the output shaft of the driving motor is fixedly connected with driving shaft by shaft coupling, the bottom outer wall of the driving shaft is fixedly connected with protective block, the driving shaft is hollow structure and its top inner wall is fixedly connected with electric push rod, the movable end bottom of the electric push rod is fixedly connected with sleeve, the bottom of the sleeve is fixedly connected with support frame, the top inner wall of the protective block is respectively fixedly connected with two kinds of fixed frame and limit block that are symmetrically distributed, each group The fixed frame is provided with two, and the bottom between the two fixed frame is fixedly connected with support shaft, the outer wall of the support shaft is movably connected with cylindrical gear, the inner wall of the limit block is movably connected with connecting frame, the bottom of the connecting frame is fixedly connected with improved bit head, the outer wall of the improved bit head is fixedly connected with the first rack matched with one side of cylindrical gear, the inner wall of the support frame is fixedly connected with the second rack matched with other side of cylindrical gear, the outer wall of the support frame is fixedly connected with second guide rail, the bottom of the second guide rail is fixedly connected with push spring, the bottom of the push spring is fixedly connected with positioning block, by being provided with handle, driving motor, driving shaft, protective block, electric push rod, sleeve, support frame, fixed frame, limit block, support shaft, cylindrical gear, connecting frame, improved bit head, first rack, second rack, push spring, positioning block, guide block, first guide rail and second guide rail, when connecting frame slides down, it is convenient that push spring drives positioning block to abut against workpiece surface, in turn, under the condition of keeping the positioning of workpiece, connecting frame can continue to slide down, so that connecting frame drives improved bit head to retract and separate from screw installed on workpiece, in turn, effectively solve the problem that improved bit head is easily driven by screw to cause workpiece to deviate when separating, affect installation work precision.

[0006] As preferred, the two sides of the positioning block are fixedly connected with guide blocks, one side of the guide blocks is slidably connected with the second guide rail, specifically, the second guide rail is in the shape of a "concave" and one side of the guide blocks is in the shape of a "convex", thereby facilitating the sliding guidance of the positioning block.

[0007] As preferred, the inner wall of the protective block is fixedly connected with a first guide rail, the first guide rail is slidably connected with the other side of the guide blocks on the positioning block, specifically, the first guide rail is in the shape of a "concave" and the other side of the guide blocks is in the shape of a "convex", thereby improving the stability of the sliding of the positioning block.

[0008] As preferred, the inner wall of the sleeve is provided with a receiving groove, the diameter of the receiving groove is greater than the diameter of the improved bit head, specifically, the improved bit head and the sleeve form a sliding structure, thereby facilitating the effective sliding of the improved bit head into the interior of the sleeve for storage.

[0009] Preferably, the outer wall of the support frame is in the shape of a cross, and the inner wall of the support frame is provided with a through groove in the same shape as the outer wall.

[0010] Preferably, a spacing is arranged between the second rack and the cylindrical gear, and teeth are arranged on one side of the second rack close to the cylindrical gear at equal intervals, and teeth are arranged on one side of the first rack close to the cylindrical gear at equal intervals, so that after the second rack is connected with the cylindrical gear, the second rack drives the cylindrical gear to rotate, and the cylindrical gear drives the first rack and the second rack to slide in opposite directions.

[0011] Preferably, the positioning blocks are arranged at equal angles along the axial center line of the protection block, and the positioning blocks are in the shape of an L, and the bottom of the positioning block is higher than the bottom of the screwdriver head, so as to ensure that the screwdriver head effectively tightens the screw, and after the positioning blocks slide down, the workpiece outer wall around the screw is positioned.

[0012] In the utility model, the elastic force of the pushing spring is smaller than the pushing force of the electric push rod and greater than the torsion of the driving shaft driven by the driving motor to rotate, so that the screwdriver head does not drive the workpiece to move when rotating, and the electric push rod continues to apply pressure to the pushing spring after sliding the connecting frame.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] (1) By setting handle, driving motor, driving shaft, protection block, electric push rod, sleeve, support frame, fixed frame, limiting block, support shaft, cylindrical gear, connecting frame, screwdriver head, first rack, second rack, pushing spring, positioning block, guide block, first guide rail and second guide rail, the positioning block is driven by the pushing spring to abut against the workpiece surface when the connecting frame slides down, so that the connecting frame can continue to slide down under the condition of keeping the workpiece positioned, the connecting frame drives the screwdriver head to retract after the connecting frame drives the screwdriver head to separate from the screw installed on the workpiece, thereby effectively solving the problem that the screwdriver head is easily driven by the screw to deviate when separating, which affects the installation work precision. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model together with embodiments of the utility model, and do not constitute a limitation on the utility model. In the drawings:

[0016] Fig. 1Is the overall structure of the present utility model schematic diagram;

[0017] Fig. 2 Is the three-dimensional section view of the present utility model schematic diagram;

[0018] Fig. 3 Is the connecting frame and the second guide rail three-dimensional connection schematic diagram of the present utility model.

[0019] In the drawing: 1, handle; 2, drive motor; 3, drive shaft; 4, protection block; 5, electric push rod; 6, sleeve; 7, support frame; 8, fixed frame; 9, limit block; 10, support shaft; 11, cylindrical gear; 12, connecting frame; 13, change chisel head; 14, first rack; 15, second rack; 16, push spring; 17, positioning block; 18, guide block; 19, first guide rail; 20, second guide rail. DETAILED DESCRIPTION

[0020] The following will be further non-restrictive detailed description of the technical scheme of the present utility model in conjunction with preferred embodiments and its drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by the person skilled in the art without making creative labor, belong to the scope of the present utility model protection.

[0021] Please refer to Figs. 1-3The utility model provides technical scheme: a screw tightening device of preventing screw from being taken up, including handle 1, the inner wall fixed connection of handle 1 has drive motor 2, the output shaft of drive motor 2 is fixedly connected with drive shaft 3 through the shaft coupling, the bottom outer wall of drive shaft 3 is fixedly connected with protection block 4, drive shaft 3 is hollow structure and its top inner wall fixedly connected with electric push rod 5, the movable end bottom of electric push rod 5 is fixedly connected with sleeve 6, the bottom of sleeve 6 is fixedly connected with support frame 7, the top inner wall of protection block 4 is fixedly connected with two kinds of fixed frame 8 and limit block 9 respectively and is symmetrically distributed, every group fixed frame 8 is provided with two, and the bottom between two fixed frame 8 is fixedly connected with support shaft 10, the outer wall of support shaft 10 is movably connected with cylindrical gear 11, the inner wall of limit block 9 is movably connected with connecting frame 12, the bottom of connecting frame 12 is fixedly connected with improved bit head 13, the outer wall of improved bit head 13 is fixedly connected with the first rack 14 matched with one side of cylindrical gear 11, the inner wall of support frame 7 is fixedly connected with the second rack 15 matched with the other side of cylindrical gear 11, the outer wall of support frame 7 is fixedly connected with second guide rail 20, the bottom of second guide rail 20 is fixedly connected with push spring 16, the bottom of push spring 16 is fixedly connected with positioning block 17, through being provided with handle 1, drive motor 2, drive shaft 3, protection block 4, electric push rod 5, sleeve 6, support frame 7, fixed frame 8, limit block 9, support shaft 10, cylindrical gear 11, connecting frame 12, improved bit head 13, first rack 14, second rack 15, push spring 16, positioning block 17, guide block 18, first guide rail 19 and second guide rail 20, when the sliding of connecting frame 12 is facilitated through the push spring 16 drive positioning block 17 and workpiece surface abut, in turn make in keeping to the positioning of workpiece, make that connecting frame 12 can continue to slide down, thereby make connecting frame 12 drive improved bit head 13 retract and separate from the screw installed on workpiece, and then effectively solve the problem of the influence installation work precision caused by the deviation of workpiece driven by screw when improved bit head 13 separates.

[0022] As preferred, the two sides of the positioning block 17 are fixedly connected with guide blocks 18, one side of the guide blocks 18 is slidably connected with the second guide rail 20. Specifically, the second guide rail 20 is in a "concave" shape, and one side of the guide blocks 18 is in a "convex" shape, thereby facilitating the sliding guidance of the positioning block 17.

[0023] As preferred, the inner wall of the protection block 4 is fixedly connected with a first guide rail 19, the first guide rail 19 is slidably connected with the other side of the guide blocks 18 on the positioning block 17. Specifically, the first guide rail 19 is in a "concave" shape, and the other side of the guide blocks 18 is in a "convex" shape, thereby improving the stability of the sliding of the positioning block 17.

[0024] As preferred, the inner wall of the sleeve 6 is provided with a containing groove, the diameter of the containing groove is greater than the diameter of the screwdriver head 13, and in particular, the screwdriver head 13 and the sleeve 6 form a sliding structure, so as to facilitate the screwdriver head 13 to be effectively slid into the inside of the sleeve 6 for storage.

[0025] As preferred, the outer wall of the support frame 7 is in the shape of a cross, and the inner wall of the support frame 7 is provided with a through groove in the same shape as the outer wall, and in particular, the fixing frame 8 and the limiting block 9 are connected with the support frame 7 through the through groove, so as to facilitate the support frame 7 to slide outside the fixing frame 8 and the limiting block 9 under the premise of effectively supporting the fixing frame 8 and effectively limiting the limiting block 9.

[0026] As preferred, the second rack 15 and the cylindrical gear 11 are provided with a spacing, and in particular, the side of the second rack 15 close to the cylindrical gear 11 is provided with a tooth block at equal intervals, and the side of the first rack 14 close to the cylindrical gear 11 is provided with a tooth block at equal intervals, so as to facilitate the second rack 15 to drive the cylindrical gear 11 to rotate after being connected with the cylindrical gear 11, so that the cylindrical gear 11 drives the first rack 14 and the second rack 15 to slide in opposite directions.

[0027] As preferred, the positioning blocks 17 are distributed at equal angles along the axial center line of the protection block 4, and the positioning blocks 17 are in the shape of an L, and in particular, the bottom of the positioning block 17 is higher than the bottom of the screwdriver head 13, so as to ensure that the screwdriver head 13 effectively tightens the screw, and after the positioning block 17 slides down, the positioning block 17 positions the outer wall of the workpiece around the screw.

[0028] In the utility model, the elastic force of the pushing spring 16 is smaller than the pushing force of the electric push rod 5 and greater than the torsion of the driving shaft 3 driven by the driving motor 2, so that the screwdriver head 13 does not drive the workpiece to move when rotating, and the electric push rod 5 continues to apply pressure to the pushing spring 16 after sliding the connecting frame 12.

[0029] In use, first, the screwdriver head 13 is connected with the external screw, then the electric push rod 5 is started, the electric push rod 5 drives the sleeve 6 to slide, the sleeve 6 drives the support frame 7 to slide, the support frame 7 drives the second guide rail 20 to slide, the second guide rail 20 drives the push spring 16 to slide, the push spring 16 drives the positioning block 17 to slide, the positioning block 17 abuts against the workpiece surface, then the driving motor 2 is started, the driving motor 2 drives the driving shaft 3 to rotate, the driving shaft 3 drives the protection block 4 to rotate, the protection block 4 drives the limiting block 9 to rotate, the limiting block 9 drives the screwdriver head 13 to rotate through the connecting frame 12, so that the screwdriver head 13 is tightened, in the process, the positioning block 17 positions the workpiece, so that the workpiece does not shake, thereby improving the stability of the screw tightening work, when the screw tightening is completed, the electric push rod 5 is continuously started, the electric push rod 5 drives the support frame 7 to slide down through the sleeve 6, at this time, since the positioning block 17 abuts against the surface of the workpiece, the bottom of the push spring 16 does not move, so that the support frame 7 exerts pressure on the push spring 16 through the second guide rail 20, the positioning block 17 is reset and slides through the elasticity of the push spring 16, and the cooperation with the screwdriver head 13 is continued, at this time, the support frame 7 slides down and drives the second rack 15 to slide down, when the second rack 15 contacts the cylindrical gear 11, the second rack 15 drives the cylindrical gear 11 to rotate through the gear block, so that the cylindrical gear 11 drives the first rack 14 and the second rack 15 to slide in opposite directions through the gear block, so that the first rack 14 drives the screwdriver head 13 to slide upward and retract, so that the screwdriver head 13 is disassembled, thereby solving the problem that the workpiece deviates due to the screw being lifted, and the precision of the workpiece installation is ensured.

[0030] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore cannot be understood as a limitation on the present application.

[0031] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing examples, or make equivalent substitutions for part of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A screw tightening device for preventing a screw from being lifted, comprising a handle (1), characterized in that: The inner wall of the handle (1) is fixedly connected with a driving motor (2), the output shaft of the driving motor (2) is fixedly connected with a driving shaft (3) through a shaft coupling, the bottom outer wall of the driving shaft (3) is fixedly connected with a protective block (4), the driving shaft (3) is of a hollow structure and the top inner wall thereof is fixedly connected with an electric push rod (5), the movable end bottom of the electric push rod (5) is fixedly connected with a sleeve (6), the bottom of the sleeve (6) is fixedly connected with a support frame (7), the top inner wall of the protective block (4) is fixedly connected with two symmetrical fixed frames (8) and limit blocks (9) respectively, each group of the fixed frame (8) is provided with two, and the bottom of the two fixed frames (8) is fixedly connected with a support shaft (10), the outer wall of the support shaft (10) is movably connected with a cylindrical gear (11), the inner wall of the limit block (9) is movably connected with a connecting frame (12), the bottom of the connecting frame (12) is fixedly connected with a screwdriver head (13), the outer wall of the screwdriver head (13) is fixedly connected with a first rack (14) matched with one side of the cylindrical gear (11), the inner wall of the support frame (7) is fixedly connected with a second rack (15) matched with the other side of the cylindrical gear (11), the outer wall of the support frame (7) is fixedly connected with a second guide rail (20), the bottom of the second guide rail (20) is fixedly connected with a pushing spring (16), and the bottom of the pushing spring (16) is fixedly connected with a positioning block (17).

2. A screw tightening device for preventing a screw from being lifted according to claim 1, characterized in that: The two sides of the positioning block (17) are fixedly connected with guide blocks (18), and one side of the guide block (18) is slidably connected with the second guide rail (20).

3. A screw tightening device for preventing a screw from being lifted according to claim 2, characterized in that: The inner wall of the protective block (4) is fixedly connected with a first guide rail (19), and the first guide rail (19) is slidably connected with the other side guide block (18) of the positioning block (17).

4. A screw tightening device for preventing a screw from being lifted according to claim 1, characterized in that: The inner wall of the sleeve (6) is provided with an accommodating groove, and the diameter of the accommodating groove is greater than that of the screwdriver head (13).

5. A screw tightening device for preventing a screw from being lifted according to claim 1, wherein: The outer wall of the support frame (7) is in a "cross" shape, and the inner wall of the support frame (7) is provided with a through groove in the same shape as the outer wall.

6. A screw tightening device for preventing a screw from being lifted according to claim 1, wherein: A spacing is arranged between the second rack (15) and the cylindrical gear (11).

7. A screw tightening device for preventing a screw from being lifted according to claim 1, wherein: The positioning blocks (17) are arranged at equal angles along the axial center line of the protective block (4), and the positioning blocks (17) are arranged in an "L" shape.

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