Connecting device and screw tightening device

Abstract

The embodiment of the invention discloses a screw tightening device and a connecting device. The connecting device comprises a first sleeve, a transmission assembly and a fixing support. The first sleeve is connected with a bolt head of the bolt, the transmission assembly comprises a plurality of universal joints which are connected in series, the fixing support comprises a first vertical plate, a second vertical plate, an S-shaped connecting plate and a fixing ring, the second vertical plate is connected with the electric screw gun, and a sleeve of at least one universal joint and the first sleeve are rotationally connected with the fixing support through the fixing ring. According to the scheme, the power transmission direction of the electric screw gun is changed through the universal joints which are connected in series, different-position transmission and non-coaxial transmission are achieved, the structure of the transmission assembly is simplified, meanwhile, the shape of the fixing support is designed according to the space above the rotating axis of a bolt, and the fixing effect is improved. The space occupied by the transmission assembly in the direction perpendicular to the rotating axis of the bolt is reduced, the overall size after the connecting device and the electric screw gun are assembled is reduced, and the use convenience of an operator is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric tools, and in particular to a connecting device and a screw tightening device. Background Technology

[0002] The electric screw gun and the bolt head of the bolt are usually connected by a sleeve, but this is not applicable when the space above the bolt rotation axis is small and insufficient to accommodate the electric screw gun.

[0003] In order to solve the above problems, a vertical torque connection device has emerged. The connection device consists of a transmission assembly consisting of two sets of worm gears or belt gears and a sleeve. One end of the transmission assembly is connected to the electric screw gun, and the other end of the transmission assembly is connected to the sleeve. This type of connection device is large in size, making the electric screw gun and the connection device appear bulky and inflexible, and inconvenient for users to operate.

[0004] Therefore, how to reduce the volume of the connection device to facilitate user operation has become a technical problem that needs to be solved urgently by those skilled in the art. SUMMARY OF THE INVENTION

[0005] This application proposes a connection device to reduce the volume of the connection device and facilitate user operation. This application also proposes a screw tightening device.

[0006] In order to achieve the above purpose, the present application provides a connecting device suitable for connecting an electric screw gun and a nut in a narrow space, including:

[0007] The first sleeve is provided with a locking hole matched with the bolt head of the bolt;

[0008] The transmission assembly comprises a plurality of universal joints connected in series, wherein the universal joint at the head end is connected to the second sleeve of the electric screw gun, and the universal joint at the end end is connected to the first sleeve;

[0009] The fixed bracket includes a first vertical plate parallel to the first sleeve, a second vertical plate parallel to the second sleeve, an S-shaped connecting plate for connecting the first vertical plate and the second vertical plate, and a fixing ring. At least one sleeve of the universal joint and the first sleeve are rotatably connected to the fixed bracket through the fixing ring.

[0010] Preferably, in the above connection device, the universal joint at the head end is provided with a connecting rod adapted to the inner hole shape of the second sleeve, and the universal joint at the head end is plug-connected with the second sleeve through the connecting rod.

[0011] Preferably, in the above connection device, the universal joint located at the end is hingedly connected to the first sleeve.

[0012] Preferably, in the above connecting device, the fixing ring is arranged at the lower end of the first vertical plate, the middle part of the S-shaped connecting plate, and the upper end of the second vertical plate.

[0013] Preferably, in the above connecting device, the fixing bracket is a metal bracket or a plastic bracket.

[0014] Preferably, in the above connecting device, the fixing bracket is an integrally formed bracket.

[0015] Preferably, in the above connecting device, the second vertical plate is bolted to the electric screwdriver.

[0016] Preferably, in the above connecting device, the width of the fixing ring near the electric screwdriver is greater than the width of the fixing ring near the first sleeve.

[0017] Preferably, in the above connecting device, a limiting boss for preventing the first sleeve from disengaging from the fixing ring is provided on the first sleeve.

[0018] A screw tightening device includes an electric screwdriver and a connecting device, and the connecting device is the connecting device described in any one of the above.

[0019] The connecting device provided by the embodiment of the present application includes a first sleeve, a transmission component, and a fixing bracket. A locking hole for cooperating with the bolt head of the bolt is provided on the first sleeve. The transmission component includes a plurality of universal joints connected in series. The fixing bracket includes a first vertical plate, a second vertical plate, an S-shaped connecting plate, and a fixing ring. The second vertical plate is connected to the electric screwdriver. The sleeves of at least one universal joint and the first sleeve are both rotatably connected to the fixing bracket through the fixing ring. In this solution, a transmission component is constituted by a plurality of universal joints connected in series to change the power transmission direction of the electric screwdriver, realizing off-site transmission and non-coaxial transmission. Compared with the transmission components composed of two sets of worm gears or belt gears in the prior art, the structure of the transmission component is simplified. At the same time, the shape of the fixing bracket can be designed according to the size of the space above the rotation axis of the bolt, and the shape of the transmission component is the same as that of the fixing bracket, so as to reduce the space occupied by the transmission component in the direction perpendicular to the rotation axis of the bolt, reduce the volume of the transmission component, and further reduce the overall volume of the connecting device disclosed in the present application after being assembled with the electric screwdriver, improving the convenience of use for the operator.

[0020] The present application also discloses a screw tightening device, including an electric screwdriver and a connecting device, wherein the connecting device is connected to the second sleeve of the electric screwdriver, and the connecting device is the connecting device disclosed in any one of the above solutions. Since the connecting device has the above technical effects, the screw tightening device having this connecting device also has the same technical effects, which will not be elaborated here. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained according to the provided drawings, and the present application can also be applied to other similar scenarios according to the provided drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the figures represent the same structure or operation.

[0022] Figure 1 It is a schematic structural diagram of the connecting device of the present application.

[0023] Wherein:

[0024] 1 - First sleeve; 11 - Limit boss; 2 - Transmission assembly; 21 - Universal joint; 211 - Connecting rod; 3 - Fixed bracket; 31 - First vertical plate; 32 - Second vertical plate; 33 - S-shaped connecting plate; 34 - Fixed ring. Detailed implementation manners

[0025] The following will further elaborate on the present application in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant application and do not limit the application. The described embodiments are only a part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0026] It should be noted that for the convenience of description, only the parts related to the relevant application are shown in the accompanying drawings. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0027] It should be understood that the "system", "device", "unit" and / or "module" used in the present application is a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, that word can be replaced by other expressions.

[0028] As shown in this application and the claims, unless the context clearly indicates otherwise, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. A method or device may also include other steps or elements. An element defined by the statement "comprising one..." does not exclude the existence of other identical elements in the process, method, product, or device that includes the element.

[0029] Among them, in the description of the embodiments of this application, unless otherwise specified, " / " means "or". For example, A / B may mean A or B; "and / or" herein is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "a plurality of" means two or more than two.

[0030] Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0031] Please refer to Figure 1 。

[0032] Some embodiments of this application disclose a connecting device, including a first sleeve 1, a transmission assembly 2, and a fixing bracket 3.

[0033] Among them, a locking hole for cooperating with the bolt head of the bolt is provided on the first sleeve 1. The first sleeve 1 is sleeved on the bolt head of the bolt through the locking hole, and is used to transmit the torque of the electric screwdriver to the bolt to realize the tightening of the bolt.

[0034] The transmission assembly 2 is used to transmit the power of the electric screwdriver and includes a plurality of universal joints 21 connected in series. The universal joint 21 at the head end is connected to the second sleeve of the electric screwdriver, and the universal joint 21 at the tail end is connected to the first sleeve 1. Specifically, when the electric screwdriver operates, it drives the plurality of universal joints 21 connected in series to rotate, and then the universal joints 21 drive the sleeve to rotate to tighten or loosen the bolt.

[0035] The fixed bracket 3 includes a first vertical plate 31 parallel to the first sleeve 1, a second vertical plate 32 parallel to the second sleeve, an S-shaped connecting plate 33 for connecting the first vertical plate 31 and the second vertical plate 32, and a fixing ring 34. The second vertical plate 32 is connected to the electric screwdriver. The sleeves of at least one universal joint 21 and the first sleeve 1 are both rotatably connected to the fixed bracket 3 through the fixing ring 34. The fixing ring 34 provides a fixed point for the universal joint 21 and the first sleeve 1 to ensure the stable operation of the transmission assembly 2 and the first sleeve 1.

[0036] The shape of the fixed bracket 3 determines the shape of the multiple universal joints 21 of the transmission assembly 2.

[0037] In this solution, the transmission assembly 2 includes multiple universal joints 21 connected in series to change the power transmission direction of the electric screwdriver and achieve off-site transmission and non-coaxial transmission. Compared with the transmission assembly 2 composed of two sets of worm gears or belt gears in the prior art, the structure of the transmission assembly 2 is simplified. At the same time, the shape of the fixed bracket 3 can be designed according to the size of the space above the rotation axis of the bolt. The shape of the transmission assembly 2 is the same as that of the fixed bracket 3 to reduce the space occupied by the transmission assembly 2 in the direction perpendicular to the rotation axis of the bolt, reduce the volume of the transmission assembly 2, and further reduce the overall volume of the connection device disclosed in this application and the electric screwdriver after assembly, improving the convenience of use for the operator.

[0038] In addition, the transmission assembly 2 disclosed in this application uses universal joints 21, which simplifies the structure of the transmission assembly 2 and also reduces the weight of the transmission assembly 2 to a certain extent. Furthermore, it reduces the overall weight of the transmission assembly 2 and the electric screwdriver, facilitating the operation of the user.

[0039] The transmission assembly 2 composed of multiple universal joints 21 connected in series has the advantages of a compact structure and high transmission efficiency.

[0040] In some embodiments of the present application, the universal joint 21 at the head end is provided with a connecting rod 211. The cross-sectional shape of the connecting rod 211 is the same as the cross-sectional shape of the inner hole of the second sleeve. The universal joint 21 at the head end is inserted and connected to the second sleeve through the connecting rod 211. This connection method can facilitate the installation and disassembly of the universal joint 21 on the electric screwdriver and reduce the connection difficulty between the transmission assembly 2 and the electric screwdriver.

[0041] The cross-sectional shape of the inner hole of the second sleeve is the same as the cross-sectional shape of the bolt head, generally a hexagonal hole. Correspondingly, the connecting plate is a hexagonal rod. The second sleeve is matched with the hexagonal connecting rod 211 through the hexagonal hole, which not only realizes the connection between the second sleeve and the universal joint 21 at the head end but also improves the reliability of the electric screwdriver driving the transmission assembly 2 to move through the second sleeve.

[0042] In this solution, both the first sleeve 1 and the second sleeve are standard parts with matching bolt heads to reduce costs. The second sleeve can not only be connected to the universal joint 21 at the first end of the transmission component 2, but also be directly connected to the bolt head when the space above the bolt head is large enough.

[0043] The universal joint 21 at the end is hingedly connected to the first sleeve 1.

[0044] Specifically, an articulated block is provided on the universal joint 21 at the end. The articulated block is located inside the first sleeve 1. A first articulated hole is provided on the first articulated block, and a second articulated hole corresponding to the position of the first articulated hole is provided on the first sleeve 1. The first articulated block and the first sleeve 1 are connected by an articulated shaft that cooperates with the first articulated hole and the second articulated hole.

[0045] Fixing rings 34 are provided at at least three positions of the fixing bracket 3.

[0046] As Figure 1 shown, the fixing rings 34 are provided at the lower end of the first vertical plate 31, the middle of the S-shaped connecting plate 33, and the upper end of the second vertical plate 32, and are respectively rotatably connected to the first sleeve 1, the sleeve of the universal joint 21 in the middle of the S-shaped connecting plate 33, and the sleeve of the universal joint 21 at the first end to fix the universal joint 21 at the first end, the universal joint 21 in the middle, and the first sleeve 1.

[0047] The fixing rings 34 are not limited to being provided at the above positions, and the number of fixing rings 34 can be increased or decreased according to the transmission requirements of the transmission component 2.

[0048] Preferably, the number of fixing rings 34 is equal to the number of universal joints 21 to ensure that each universal joint 21 has a fixed point on the fixing bracket 3 and improve the reliability of the operation of the transmission component 2.

[0049] In some embodiments of the present application, the first vertical plate 31, the second vertical plate 32, the S-shaped connecting plate 33, and the fixing rings 34 are integrally formed to reduce the processing difficulty of the fixing bracket 3 and improve the overall strength of the fixing bracket 3 at the same time.

[0050] In some other embodiments of the present application, the first vertical plate 31, the second vertical plate 32, and the S-shaped connecting plate 33 are integrally formed. The fixing rings 34 are connected to the first vertical plate 31, the second vertical plate 32, and the S-shaped connecting plate 33 by bolts, or welded connections, or riveted connections.

[0051] The first sleeve 1 is cylindrical. The cylindrical sleeve is installed inside the fixing ring 34 and is coaxial with the fixing ring 34. In order to ensure that the first sleeve 1 can rotate inside the fixing ring 34, the first sleeve 1 and the fixing ring 34 are in clearance fit. During use, there is a risk that the first sleeve 1 slides out upward from the fixing ring 34, reducing the working stability of the connecting device.

[0052] To improve the stability of the connecting device, a limiting boss 11 is provided on the first sleeve 1. The limiting boss 11 is located below the lower end surface of the fixing ring 34 and is used to prevent the first sleeve 1 from disengaging from the fixing ring 34.

[0053] Preferably, the limiting boss 11 is an annular boss, and the annular boss is coaxially arranged with the first sleeve 1.

[0054] Since the first sleeve 1 and the fixing ring 34 are in clearance fit, the first sleeve 1 will move along its own axis direction within the fixing ring 34. The limiting boss 11 can limit the upward movement of the first sleeve 1 along its own axis direction, but cannot limit the downward movement of the first sleeve 1 along its own axis direction. To solve the above problems, an anti-slip pad is provided on the sleeve of the universal joint 21 on the first sleeve 1 to prevent the sleeve above the first sleeve 1 from sliding into the fixing ring 34.

[0055] In some embodiments of the present application, the anti-slip pad is adhesively connected to the sleeve.

[0056] The fixing bracket 3 needs to have a certain strength.

[0057] The fixing bracket 3 can be a metal bracket or a plastic bracket.

[0058] In the embodiment where the fixing bracket 3 is a metal bracket, on the premise of ensuring the cost, the fixing bracket 3 preferably selects a metal with light weight for production to reduce the overall weight of the connecting device. In some embodiments of the present application, the fixing bracket 3 is an aluminum alloy bracket.

[0059] In the embodiment where the fixing bracket 3 is a plastic bracket, on the premise of ensuring the cost, the fixing bracket 3 is preferably made of a material with light weight and high strength.

[0060] Since the transmission assembly 2 is installed on the electric screwdriver through the fixing bracket 3, the universal joint 21 at the first end is only inserted and connected to the second sleeve of the electric screwdriver, and it can ensure the transmission connection between the universal joint 21 at the first end and the second sleeve.

[0061] The connection between the fixing bracket 3 and the electric screwdriver is preferably made in a detachable manner.

[0062] In some embodiments of the present application, the second vertical plate 32 of the fixing bracket 3 is bolted to the electric screwdriver.

[0063] Specifically, bolt holes are provided on the second vertical plate 32, bolt holes are provided on the electric screwdriver, and the second vertical plate 32 and the electric screwdriver are connected by screws that cooperate with the bolt holes.

[0064] To ensure the stability of the fit, in this application, the width of the fixing ring 34 near the electric screwdriver is greater than the width of the fixing ring 34 near the first sleeve 1.

[0065] The fixing ring 34 near the electric screwdriver can not only fix the universal joint at the first end on the second vertical plate, but also play a role in limiting and guiding the rotation of the universal joint at the first end, ensuring the efficient transmission of torque.

[0066] The width of the fixing ring 34 connected to the first sleeve 1 is the narrowest. The fixing ring 34 connected to the first sleeve 1 not only fixes the first sleeve 1, but also plays a role in limiting and guiding the rotation of the first sleeve 1, improving the transmission efficiency of torque.

[0067] It should be noted here that the width of the fixing ring 34 is the dimension of the fixing ring 34 along its own axis direction.

[0068] This application also discloses a screw tightening device, including an electric screwdriver and a connecting device. Among them, the connecting device is connected to the second sleeve of the electric screwdriver, and the connecting device is the connecting device disclosed in any of the above solutions.

[0069] Since the connecting device has the above technical effects, the screw tightening device with this connecting device also has the same technical effects, which will not be elaborated here.

[0070] The above description is only for the preferred embodiments of this application and the description of the applied technical principles, and is not used to limit this application. For those skilled in the art, this application can have various changes and modifications. The scope of the application involved in this application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above application concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in this application that have similar functions.

Claims

1. A connection device, characterized in that: Suitable for connecting electric screw guns and nuts in narrow spaces, including: A first sleeve (1) is provided with a locking hole that matches with the bolt head of the bolt; The transmission assembly (2) comprises a plurality of universal joints (21) connected in series, wherein the universal joint (21) at the head end is connected to the second sleeve of the electric screw gun, and the universal joint (21) at the tail end is connected to the first sleeve (1); A fixed bracket (3) comprises a first vertical plate (31) parallel to the first sleeve (1), a second vertical plate (32) parallel to the second sleeve, an S-shaped connecting plate (33) for connecting the first vertical plate (31) and the second vertical plate (32), and a fixing ring (34), wherein at least one sleeve of the universal joint (21) and the first sleeve (1) are rotatably connected to the fixed bracket (3) via the fixing ring (34).

2. The connection device according to claim 1, characterized in that: The universal joint (21) at the head end is provided with a connecting rod (211) adapted to the inner hole shape of the second sleeve, and the universal joint (21) at the head end is plug-connected to the second sleeve via the connecting rod (211).

3. The connection device according to claim 1, characterized in that: The universal joint (21) located at the end is hingedly connected to the first sleeve (1).

4. The connection device according to claim 1, characterized in that: The fixing ring (34) is arranged at the lower end of the first vertical plate (31), the middle part of the S-shaped connecting plate (33) and the upper end of the second vertical plate (32).

5. The connection device according to claim 1, characterized in that: The fixing bracket (3) is a metal bracket or a plastic bracket.

6. The connection device according to claim 4, characterized in that: The fixing bracket (3) is an integrally formed bracket.

7. The connection device according to claim 1, characterized in that: The second vertical plate (32) is connected to the electric screw gun via bolts.

8. The connection device according to claim 1, characterized in that: The width of the fixing ring (34) close to the electric screw gun is greater than the width of the fixing ring (34) close to the first sleeve (1).

9. The connection device according to claim 1, characterized in that: The first sleeve (1) is provided with a limiting boss (11) for preventing the first sleeve (1) from escaping from the fixing ring (34).

10. A screw tightening device, characterized in that: The invention comprises an electric screw gun and a connecting device, wherein the connecting device is the connecting device according to any one of claims 1 to 9.

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