Screw clamping device

Abstract

The utility model relates to the technical field of screw clamping, and discloses a screw clamping device which comprises a mounting plate, a driving air cylinder is arranged on the mounting plate, a guide sleeve is arranged outside the driving air cylinder, the output end of the driving air cylinder is connected with a bolt ejector rod, a sliding connecting sleeve is arranged outside the bolt ejector rod, and the sliding connecting sleeve is connected with the guide sleeve. The sliding connecting sleeve extends into the guide sleeve, the end face of the sliding connecting sleeve is connected with a spring, a clamping jaw is installed on the end face of the sliding connecting sleeve, a clamping force adjusting sleeve is arranged outside the clamping jaw, and the diameter of a circle formed by the clamping ends of the clamping jaw is slightly smaller than the diameter of a nut by rotating the clamping force adjusting sleeve and adjusting the opening angle of the clamping jaw. And after the nut makes contact with the inner side of the clamping jaw, friction force is generated through extrusion of the clamping jaw on the nut, then the nut is clamped and fixed by the clamping jaw, the structure is simple, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of screw clamping, in particular to a screw clamping device. Background Art

[0002] With the rapid development of technology and the strong support of the country, all industries are sparing no effort to promote the process of industrial automation. In this process, the design of automated machinery and equipment undoubtedly plays a crucial role. Specifically in the screw assembly link, screws need to be accurately matched with the assembly holes on parts for assembly, which involves accurately placing the screws into the assembly holes or precisely removing them from the parts. Currently, the following three solutions are commonly used in the industry to achieve this goal:

[0003] Solution 1: Adopt the method of manual feeding, that is, manually place the screws into the corresponding assembly holes, and then complete the fastening of the screws through manual or special screw tightening devices. However, this solution has the disadvantages of low efficiency and difficult to guarantee accuracy, which will have an adverse impact on the subsequent automated assembly process.

[0004] Solution 2: Use a feeding tray to convey the screws to the vicinity of the screw suction device, and then the device accurately places the screws into the corresponding assembly holes through magnetic suction, air suction or air blowing, etc., and then completes the fastening through a screw tightening device. Although this solution realizes automated assembly and improves efficiency, it still needs to be improved. For example, in some disclosed technologies such as the screw suction and locking device shown in CN109304603A, although the problem of manual assembly efficiency is solved, it is difficult to ensure the stability of the screw during the movement process when the suction device sucks the screw, which may cause the deviation of the screw from the position of the assembly hole and affect the assembly accuracy.

[0005] Solution 3: Adopt a claw-type screw grasping device for screw clamping and placement. Taking a screw grasping device shown in the publication number CN211030060U as an example, this solution uses two pawls and sets rectangular grooves at their free ends to limit the degrees of freedom of the screw and prevent deviation during the position transfer process. However, due to the existence of the pawls, when facing an assembly hole with a relatively narrow space, it may be difficult to effectively place the screw into the assembly hole.

[0006] Therefore, based on the above technical problems, it is necessary for those skilled in the art to develop a screw clamping device. Content of the Utility Model

[0007] The purpose of the utility model is to provide a screw clamping device to solve the problems put forward in the above background art.

[0008] To achieve the above purpose, the utility model provides the following technical solutions:

[0009] Technical solution of a screw clamping device, including a mounting plate, on which a driving cylinder is provided, a guide sleeve is arranged outside the driving cylinder, the output end of the driving cylinder is connected with a bolt ejecting rod, a sliding connecting sleeve is arranged outside the bolt ejecting rod, the sliding connecting sleeve extends into the guide sleeve, and a spring is connected to the end face, a clamping jaw is installed on the end face of the sliding connecting sleeve, and a clamping force adjusting sleeve is arranged outside the clamping jaw.

[0010] As a preferred technical solution, a loosening prevention block is arranged at the top of the clamping force adjusting sleeve, and a stepped cone section is arranged at the connection between the inner wall of the clamping force adjusting sleeve and the clamping jaw.

[0011] As a preferred technical solution, a sensor bracket is arranged on one adjacent side of the guide sleeve, a position sensor is installed on the sensor bracket, an induction ring is installed outside the guide sleeve opposite to the position sensor, and a photoelectric sensor is installed at the bottom of the sensor bracket.

[0012] As a preferred technical solution, the sliding connecting sleeve is slidably connected with the guide sleeve.

[0013] As a preferred technical solution, the middle part of the clamping jaw is hollowed out, and a plurality of U-shaped through grooves are axially opened at the other end of the clamping jaw, and the U-shaped through grooves are circumferentially distributed, and the whole presents a coaxial tuning fork shape.

[0014] As a preferred technical solution, the two ends of the spring are respectively abutted against the mounting plate and the guide sleeve.

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

[0016] (1) The present utility model is a screw clamping device. The middle part of the clamping jaw is hollowed out, and a plurality of U-shaped through grooves are axially opened at the other end of the clamping jaw, and the U-shaped through grooves are circumferentially distributed, and the whole presents a coaxial tuning fork shape, so that the clamping end of the clamping jaw has a certain toughness. By rotating the clamping force adjusting sleeve, the opening angle of the clamping jaw is adjusted, so that the diameter of the circle formed by the clamping ends of the clamping jaw is slightly smaller than the diameter of the nut, indirectly realizing the adjustment of the clamping force of the clamping jaw. After the nut contacts the inner side of the clamping jaw, the friction force is generated by the extrusion of the nut by the clamping jaw, and then it is clamped and fixed by the clamping jaw. The structure is simple, the operation is convenient, the clamping of the screw by the clamping jaw is stable, and it is convenient to send the screw into the assembly hole subsequently. The arranged spring, the clamping jaw acts on the sliding connecting sleeve and squeezes the spring to prevent damage due to impact, playing a role in anti-collision.

[0017] (2) The present utility model is a screw clamping device. The arranged position sensor and induction ring can detect whether the position of the clamping jaw changes, so as to protect the clamping jaw and judge whether the screw is in a clamped state. The arranged photoelectric sensor can detect whether the clamping jaw clamps the screw, so as to facilitate the judgment of the execution of subsequent actions. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the overall structure of a screw clamping device;

[0019] Figure 2 is a schematic diagram of the cross-sectional structure of a screw clamping device;

[0020] Figure 3 is a schematic diagram of the partial structure of a screw clamping device.

[0021] In the attached drawing reference numerals: 1, mounting plate; 2, sensor bracket; 21, position sensor; 22, induction ring; 23, photoelectric sensor; 3, driving cylinder; 301, bolt ejecting rod; 31, guide sleeve; 32, spring; 33, sliding connection sleeve; 34, clamping force adjusting sleeve; 341, stepped taper section; 35, anti-loosening block; 36, jaw. Detailed implementation manners

[0022] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the attached drawings and specific embodiments. For those skilled in the art, the present invention can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention.

[0023] As Figures 1-3 shown, the present invention provides a technical solution for a screw clamping device: including a mounting plate 1, a driving cylinder 3 is arranged on the mounting plate 1, a guide sleeve 31 is arranged outside the driving cylinder 3, the output end of the driving cylinder 3 is connected with a bolt ejecting rod 301, a sliding connection sleeve 33 is arranged outside the bolt ejecting rod 301, the sliding connection sleeve 33 extends into the guide sleeve 31, the sliding connection sleeve 33 is slidably connected with the guide sleeve 31, and the connecting side end face is in contact with the spring 32. The two ends of the spring 32 are respectively abutted against the mounting plate 1 and the guide sleeve 31. A jaw 36 is installed on the end face of the sliding connection sleeve 33, a clamping force adjusting sleeve 34 is arranged outside the jaw 36, the middle part of the jaw 36 is hollowed out, the other end of the jaw 36 is axially provided with a plurality of U-shaped through grooves, and the U-shaped through grooves are circumferentially distributed, and the whole presents a coaxial tuning fork shape. An anti-loosening block 35 is arranged at the top of the clamping force adjusting sleeve 34. A stepped taper section 341 is arranged at the connection between the inner wall of the clamping force adjusting sleeve 34 and the jaw 36. A sensor bracket 2 is arranged on one adjacent side of the guide sleeve 31, a position sensor 21 is installed on the sensor bracket 2, an induction ring 22 is installed outside the position sensor 21 relative to the guide sleeve 31, and a photoelectric sensor 23 is installed at the bottom of the sensor bracket 2.

[0024] In this embodiment, during use, first place the screw vertically at the designated position. Since the middle part of the jaw 36 is hollowed out, and multiple U-shaped through slots are axially formed at the other end and are circumferentially distributed, and the overall shape presents a coaxial tuning fork shape, the clamping end of the jaw has a certain toughness. By rotating the clamping force adjusting sleeve 34, the opening angle of the jaw is adjusted so that the diameter of the circle formed by the clamping ends of the jaw is slightly smaller than the diameter of the nut, indirectly realizing the adjustment of the clamping force of the jaw. The screw clamping device moves to directly above the screw and then moves downward. After the nut contacts the inner side of the jaw, frictional force is generated by the extrusion of the nut by the jaw. At this time, the jaw 36 clamps and fixes the screw, the spring 32 is compressed due to the force, the induction ring 22 moves upward along with the sliding connecting sleeve 33, and the signal of the position sensor 21 changes, causing the screw clamping device to stop moving downward. Then, it is lifted upward and moves to the assembly position. Then, the driving cylinder 3 extends, and the screw is pushed out of the jaw 36 through the bolt ejecting rod 301 and falls into the assembly hole. During the process of feeding the screw into the assembly hole, the photoelectric sensor 23 detects whether there is a screw clamped by the jaw 36. If, under the action of the bolt ejecting rod 301, the screw is pushed out of the jaw and falls into the assembly hole, and after the photoelectric sensor 23 detects that there is no screw on the jaw, the next screw clamping operation is performed. Thus, one screw assembly process is completed.

[0025] By arranging the coaxial tuning fork-shaped jaw 36, this device facilitates the clamping and placement of the screw, simplifies the complexity of the jaw, enables it to have better stability during work, and is easy to manufacture and maintain. At the same time, by arranging the spring 32, it can play a buffering role when the screw contacts the jaw 36 and prevent the jaw from being damaged due to impact. In addition, the arrangements of the position sensor 21 and the photoelectric sensor 23 can detect in real time whether there is a screw clamped by the jaw 36, improving the assembly efficiency.

[0026] The working principle and usage process of the present utility model: After the present utility model is installed, work according to the above embodiment until all work steps are completed.

[0027] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

[0028] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. are based on the orientation or positional relationships shown in the drawings, and are 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, and thus should not be construed as a limitation to the present utility model.

[0029] In the present utility model, unless otherwise clearly defined and limited, the terms "install", "set", "connect", "fix", "swivel connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] According to the embodiments of the present utility model as described above, these embodiments do not describe all the details in detail, nor do they limit the present utility model to only the specific embodiments. Obviously, many modifications and variations can be made according to the above description. The purpose of selecting and specifically describing these embodiments in this specification is to better explain the principle and practical application of the present utility model, so that those skilled in the art can make good use of the present utility model and its modified use based on the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A screw clamping device, characterized in that, It includes a mounting plate (1), on which a driving cylinder (3) is provided. A guide sleeve (31) is arranged outside the driving cylinder (3). The output end of the driving cylinder (3) is connected to a bolt ejector rod (301). A sliding connection sleeve (33) is arranged outside the bolt ejector rod (301). The sliding connection sleeve (33) extends into the guide sleeve (31), and a spring (32) is connected to the end face. A clamping jaw (36) is installed on the end face of the sliding connection sleeve (33), and a clamping force adjusting sleeve (34) is arranged outside the clamping jaw (36).

2. The screw clamping device according to claim 1, characterized in that: A loosening prevention block (35) is arranged at the top of the clamping force adjusting sleeve (34), and a stepped taper section (341) is arranged at the connection between the inner wall of the clamping force adjusting sleeve (34) and the clamping jaw (36).

3. The screw clamping device according to claim 1, characterized in that: A sensor bracket (2) is arranged on one adjacent side of the guide sleeve (31). A position sensor (21) is installed on the sensor bracket (2). An induction ring (22) is installed outside the position sensor (21) relative to the guide sleeve (31). A photoelectric sensor (23) is installed at the bottom of the sensor bracket (2).

4. A screw clamping device according to claim 1, characterized in that: The sliding connection sleeve (33) is slidably connected to the guide sleeve (31).

5. The screw clamping device according to claim 1, characterized in that: The middle part of the clamping jaw (36) is hollowed out. Multiple U-shaped through grooves are axially formed at the other end of the clamping jaw (36), and the U-shaped through grooves are circumferentially distributed, presenting an overall shape of a coaxial tuning fork.

6. The screw clamping device according to claim 1, wherein: Both ends of the spring (32) are respectively abutted against the mounting plate (1) and the guide sleeve (31).

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