Electric ratchet wheel screwdriver with manual fixed torque

Abstract

The utility model discloses an electric ratchet wheel screwdriver with manual fixed torque, which comprises a screwdriver main body, one end of the screwdriver main body is provided with a screwdriver execution piece for turning a screw, one end of the screwdriver main body far away from the screwdriver execution piece is connected with a grip, and the grip is provided with a fixed torque wrench. According to the electric screwdriver, the grip is arranged on the electric screwdriver, the grip can be held for operation when the electric screwdriver is used, the using posture is comfortable, and the problem of hand ache during screwing can be effectively relieved. The torque wrench is arranged on the grip, so that the torque can be directly measured through the torque wrench on the grip after a screw is screwed, the torque wrench does not need to be found any more, and the torque wrench is not easy to lose.

Description

Technical Field

[0001] The utility model relates to the technical field of electric screwdrivers, in particular to an electric ratchet screwdriver with manual fixed torque. Background Art

[0002] An electric screwdriver, also known as an electric screwdriver, an electric screwdriver, an electric screwdriver, etc., is an electric tool used to tighten and loosen screws. The existing Chinese utility model patent with application publication number CN115533807A discloses an electric screwdriver, including an output shaft, a housing, a power output disc, internal and external gears, a shifting member, a transmission device, and a motor. The outer surfaces of the internal and external gears are provided with first external teeth, the inner surfaces of the internal and external gears are provided with internal teeth, the rear end of the output shaft is provided with second external teeth adapted to the internal teeth, the internal and external gears are located in the housing, the rear end of the output shaft passes through the front end of the housing to connect with the internal and external gears, the outer surfaces of the internal and external gears are also provided with a receiving groove, the shifting member is partially received in the receiving groove, the front end of the power output disc is provided with a third external tooth adapted to the internal teeth, the shifting member can drive the internal and external gears to move up and down axially, and the motor is connected to the rear end of the power output disc through the transmission device.

[0003] The electric screwdriver in the prior art can automatically drive screws, but due to its overall long shape, the gripping posture is uncomfortable, and the hands are prone to soreness after long-term use. In addition, after driving the screws, a torque wrench is needed to measure whether the screws are over- or under-driven. Usually, these two tools are stored separately, and they need to be found when they are needed, which is inconvenient to use and store. Utility Model Content

[0004] In order to overcome the problems of uncomfortable posture in use and inconvenience in measuring torque of the electric screwdriver in the prior art, the utility model provides an electric ratchet screwdriver with manual torque setting.

[0005] The following is the specific technical solution of the utility model:

[0006] An electric ratchet screwdriver with manual fixed torque comprises a screwdriver body, one end of which is provided with a screwdriver actuator for screwing screws, and an end of the screwdriver body away from the screwdriver actuator is connected with a handle, on which a fixed torque wrench is provided.

[0007] Furthermore, the handle and the electric screwdriver body are in a T shape.

[0008] Furthermore, the constant torque wrench includes a constant torque actuator, the constant torque actuator is connected to a torque measuring device, and the torque measuring device includes a torque detection device and a torque prompt device.

[0009] Furthermore, the torque measuring device includes a lower gear plate connected to the fixed torque actuator and an upper gear plate meshing with the lower gear plate, the upper gear plate is connected to a pressure spring, the pressure spring, the upper gear plate and the lower gear plate are all arranged inside a pressure chamber, one end of the interior of the pressure chamber is connected to the pressure spring, and the other end is threadedly connected to a pressure application block.

[0010] Furthermore, the constant torque wrench includes a torque ring for adjusting the torque measurement value, the torque ring is sleeved on the pressure application block, a limiting column is arranged inside the torque ring, a limiting groove is arranged on the pressure application block, and the limiting column is embedded in the limiting groove.

[0011] Furthermore, the torque prompting device includes a spring sheet arranged outside the pressure chamber, the torque ring covers a part of the pressure chamber, and the spring sheet is located between the pressure chamber and the torque ring.

[0012] Furthermore, a connecting piece is provided at one end of the pressure spring connected to the pressure chamber, and the connecting piece includes a first spring connecting column and a pressure chamber connecting plate, a plurality of first connecting protrusions are provided on the pressure connecting plate, and a plurality of connecting grooves are provided inside the pressure chamber, and the first connecting protrusions are embedded in the connecting grooves.

[0013] Furthermore, a second spring connecting column and a second connecting protrusion are provided on the upper gear plate, the second spring connecting column is connected to the pressure spring, the connecting groove is an elongated strip, the first connecting protrusion is embedded in one end of the connecting groove, and the second connecting protrusion is embedded in the other end of the connecting groove.

[0014] Furthermore, a screwdriver nozzle chamber is provided at one end of the constant torque wrench, and a plurality of screwdriver nozzle grooves are provided in the screwdriver nozzle chamber, and each screwdriver nozzle groove can accommodate a screwdriver nozzle.

[0015] As a preferred embodiment, the screwdriver body includes a shell, a drive motor is arranged in the shell, the drive motor is transmission-connected to a planetary gear train, the planetary gear train is transmission-connected to a ratchet adjustment device, and the ratchet adjustment device is transmission-connected to a screwdriver actuator.

[0016] Furthermore, the ratchet adjustment device includes a pawl, an ejector pin pressed against the pawl, and an ejector pin spring sleeved on the ejector pin.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] By setting a handle on the electric screwdriver, you can hold the handle to operate it, which is more comfortable to use and can effectively alleviate the problem of hand pain when screwing. By setting a torque wrench on the handle, you can directly measure the torque through the torque wrench on the handle after screwing, without having to look for the torque wrench, and the torque wrench is not easy to lose. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are intended to further illustrate the contents of the present invention and constitute a part of the specification. Together with the following embodiments, they are used to explain the present invention but should not constitute a limitation to the present invention.

[0020] In the attached picture:

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the torque wrench in the utility model;

[0023] Figure 3 It is a further exploded structural diagram of the torque wrench in the utility model;

[0024] Figure 4 It is a schematic diagram of the internal structure of the screwdriver body in the utility model. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0026] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] An electric ratchet screwdriver with manual fixed torque comprises a screwdriver body 1, one end of which is provided with a screwdriver actuator 2 for tightening screws, and the end of the screwdriver body 1 away from the screwdriver actuator 2 is connected to a handle 3, on which a fixed torque wrench 4 is provided.

[0029] Specifically, the constant torque wrench 4 includes a constant torque actuator 5 , and the constant torque actuator 5 is connected to a torque measuring device 6 , and the torque measuring device 6 includes a torque detection device 7 and a torque prompting device 8 .

[0030] The torque measuring device 6 has multiple gears. When in use, the hand can be held on the handle to perform screwing operations, which is more comfortable to use. After the screw is screwed, the torque wrench 4 on the handle 3 can be directly used to measure the torque to ensure that the screw is not under- or over-tightened. When the torque wrench 4 is used, the fixed torque actuator 5 is installed on the screw, and the torque wrench is rotated. If the torque wrench rotates synchronously with the screw, it means that the tightness of the screw is insufficient and needs to be further tightened, and the gear of the electric screwdriver body is adjusted to a higher level to meet the next screw tightening requirements; if the torque wrench and the screw rotate relative to each other, and the torque prompt device 8 emits a prompt sound, it means that the tightness of the screw is sufficient or excessive. At this time, the torque measuring device 6 is adjusted to a higher level. If the torque wrench and the screw rotate relative to each other, and the torque prompt device emits a prompt sound, it means that the torque is excessive and needs to be loosened, and the gear of the screwdriver body is lowered. If the torque wrench can rotate synchronously with the screw and the torque prompt device does not emit a prompt sound, it means that the tightness of the screw is appropriate and will not be excessive or too loose.

[0031] Specifically, the torque measuring device 6 includes a pressure chamber 64, and also includes a lower toothed disc 61 connected to the fixed torque actuator 5 and an upper toothed disc 62 meshing with the lower toothed disc 61, and the upper toothed disc 62 is connected to a pressure spring 63. The pressure spring 63, the upper toothed disc 62 and the lower toothed disc 61 are all arranged inside the pressure chamber 64. One end of the interior of the pressure chamber 64 is connected to the pressure spring 63, and the other end is threadedly connected to a pressure application block 65.

[0032] Furthermore, a retaining spring 68 is disposed on the lower end surface of the pressure applying block 65 , and the retaining spring 68 is sleeved on the constant torque actuator 5 to limit the position of the pressure applying block.

[0033] The pressure applying block 65 is provided with a through hole 651 , the fixed torque actuator is inserted into the through hole 651 , and the lower end surface of the lower gear plate 61 abuts against the upper end surface of the pressure applying block 65 .

[0034] By meshing the upper toothed disc 62 and the lower toothed disc 61 and applying a certain pressure to the upper toothed disc 62 and the lower toothed disc 61, they can rotate synchronously under a certain torque. If the torque exceeds the set torque range, the upper toothed disc 62 and the lower toothed disc 61 will produce relative rotation. Whether the upper toothed disc and the lower toothed disc can be relatively moved by tightening the screw with the torque wrench 4 can accurately determine whether the torque of the screw meets the requirement.

[0035] By threading the pressure applying block 65 on the pressure chamber, a pressure spring 63 is arranged inside the pressure chamber, and there is an interaction force between the pressure spring 63 and the upper toothed disc 62, between the upper toothed disc 62 and the lower toothed disc 61, and between the lower toothed disc 61 and the pressure applying block 65. By adjusting the tightness of the thread between the pressure chamber 64 and the pressure applying block 65, the expansion and contraction of the pressure spring 63 can be adjusted, and then the magnitude of the interaction force between the upper toothed disc 62 and the lower toothed disc 61 can be adjusted. The greater the interaction force between the upper toothed disc 62 and the lower toothed disc 61, the greater the torque required to make them rotate relative to each other. When in use, if the screw to be measured can make the upper toothed disc and the lower toothed disc move relative to each other, it means that the torque of the screw is sufficient. If not, it means that the torque is insufficient. Since the torque required for screws in different projects is different, the torque range that can be measured by the torque wrench can be adjusted by the pressure applying block.

[0036] Specifically, the constant torque wrench 4 includes a torque ring 41 for adjusting the torque measurement value. The torque ring 41 is sleeved on the pressure application block 65. A limiting column 42 is arranged inside the torque ring 41. A limiting groove 66 is arranged on the pressure application block 65. The limiting column 42 is embedded in the limiting groove 66.

[0037] Through the cooperation between the limiting column 42 and the limiting groove 66 , the torque ring 41 and the pressure applying block can be rotated synchronously, which is convenient for adjusting the torque value.

[0038] Furthermore, the torque ring 41 is provided with an adjustment scale for the user to clearly measure the torque value.

[0039] Furthermore, the pressure chamber 64 is provided with a wrench housing 9 on its outer shell.

[0040] Specifically, the torque prompt device 8 includes a spring piece 81 disposed outside the pressure chamber 64, the torque ring 41 covers a portion of the pressure chamber 64, and the spring piece 81 is located between the pressure chamber 64 and the torque ring 41. When the torque of the screw exceeds a specified range, the spring piece 81 outside the pressure chamber 64 will rotate with the pressure chamber 64 and collide with the inner wall of the torque ring 41 to produce a "click" prompt sound.

[0041] It is worth noting that the torque warning device 8 also includes an upper toothed disc 62 and a lower toothed disc 61. When the upper toothed disc 62 and the lower toothed disc 61 rotate relative to each other, they collide with each other and release a sound. The function of the spring piece 81 is to add a warning sound to make it more obvious.

[0042] Specifically, a connecting piece 67 is provided at one end of the pressure spring 63 connected to the pressure chamber 64. The connecting piece 67 includes a first spring connecting column 671 and a pressure chamber connecting plate. A plurality of first connecting protrusions 673 are provided on the pressure connecting plate. A plurality of connecting grooves are provided inside the pressure chamber 64. The first connecting protrusions 673 are embedded in the connecting grooves.

[0043] Specifically, a second spring connecting column 622 and a second connecting protrusion 623 are provided on the upper gear plate 62, the second spring connecting column 622 is connected to the pressure spring 6, the connecting groove is an elongated strip, the first connecting protrusion 673 is embedded in one end of the connecting groove, and the second connecting protrusion 623 is embedded in the other end of the connecting groove.

[0044] Specifically, a screwdriver nozzle chamber 44 is disposed at one end of the constant torque wrench 4 , and a plurality of screwdriver nozzle grooves are disposed in the screwdriver nozzle chamber 44 , and each screwdriver nozzle groove can accommodate a screwdriver nozzle 46 .

[0045] By arranging the nozzle compartment 44 on the fixed torque wrench, it is convenient for the user to take out the nozzle compartment 46.

[0046] Specifically, the screwdriver body can be a common electric screwdriver on the market, such as the screwdriver in Chinese utility model patent CN115533807A, which can be used as an implementation of the electric screwdriver body in the utility model. This implementation is only an example, and other types of electric screwdrivers are also within the protection scope of the utility model.

[0047] Furthermore, the screwdriver body 1 includes a housing 11 , a drive motor 12 is disposed in the housing 11 , the drive motor 12 is transmission-connected to a planetary gear train 13 , the planetary gear train 13 is transmission-connected to a ratchet adjustment device 14 , and the ratchet adjustment device 14 is transmission-connected to the screwdriver actuator 2 .

[0048] Specifically, the ratchet adjustment device 14 includes a pawl 15 , an ejector pin pressed against the pawl 15 , and an ejector spring 17 sleeved on the ejector pin.

[0049] Through the cooperation of the ratchet 15, the ejector pin and the ejector pin spring 17, the electric screwdriver can maintain rotation in one direction to prevent reversal.

[0050] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An electric ratchet screwdriver with manual fixed torque, comprising a screwdriver body, one end of which is provided with a screwdriver actuator for screwing screws, characterized in that: A handle is connected to one end of the screwdriver body away from the screwdriver actuator, and a fixed torque wrench is arranged on the handle.

2. The electric ratchet screwdriver with manual torque setting according to claim 1, characterized in that: The constant torque wrench comprises a constant torque actuator, the constant torque actuator is connected to a torque measuring device, and the torque measuring device comprises a torque detection device and a torque prompting device.

3. The electric ratchet screwdriver with manual torque setting according to claim 2, characterized in that: The torque measuring device includes a lower toothed disc connected to the fixed torque actuator and an upper toothed disc meshing with the lower toothed disc, the upper toothed disc is connected to a pressure spring, the pressure spring, the upper toothed disc and the lower toothed disc are all arranged inside a pressure chamber, one end of the interior of the pressure chamber is connected to the pressure spring, and the other end is threadedly connected to a pressure applying block.

4. The electric ratchet screwdriver with manual torque setting according to claim 2, characterized in that: The constant torque wrench comprises a torque ring for adjusting the torque measurement value, the torque ring is sleeved on the pressure applying block, a limiting column is arranged inside the torque ring, a limiting groove is arranged on the pressure applying block, and the limiting column is embedded in the limiting groove.

5. The electric ratchet screwdriver with manual torque setting according to claim 4, characterized in that: The torque prompting device comprises a spring sheet arranged outside the pressure chamber, the torque ring covers a part of the pressure chamber, and the spring sheet is located between the pressure chamber and the torque ring.

6. The electric ratchet screwdriver with manual torque setting according to claim 3, characterized in that: A connecting piece is provided at one end of the pressure spring connected to the pressure chamber, and the connecting piece includes a first spring connecting column and a pressure chamber connecting plate. A plurality of first connecting protrusions are provided on the pressure connecting plate, and a plurality of connecting grooves are provided inside the pressure chamber. The first connecting protrusions are embedded in the connecting grooves, and the connecting grooves are long strips.

7. The electric ratchet screwdriver with manual torque setting according to claim 6, characterized in that: The upper toothed disc is provided with a second spring connecting column and a second connecting protrusion, the second spring connecting column is connected to the pressure spring, the first connecting protrusion is embedded in one end of the connecting groove, and the second connecting protrusion is embedded in the other end of the connecting groove.

8. The electric ratchet screwdriver with manual torque setting according to claim 1, characterized in that: A screwdriver nozzle chamber is arranged at one end of the constant torque wrench. A plurality of screwdriver nozzle grooves are arranged in the screwdriver nozzle chamber. Each screwdriver nozzle groove can accommodate a screwdriver nozzle.

9. The electric ratchet screwdriver with manual torque setting according to claim 1, characterized in that: The screwdriver body comprises a shell, a driving motor is arranged in the shell, the driving motor is drivingly connected to a planetary gear train, the planetary gear train is drivingly connected to a ratchet adjustment device, and the ratchet adjustment device is drivingly connected to a screwdriver actuator.

10. The electric ratchet screwdriver with manual torque setting according to claim 9, characterized in that: The ratchet adjustment device comprises a ratchet pawl, an ejector pin pushed against the ratchet pawl, and an ejector pin spring sleeved on the ejector pin.

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