High-precision fine adjustment mechanism of torque wrench

Abstract

The utility model relates to a torque wrench high-precision fine tuning mechanism, which comprises a wrench body and a driving unit, the driving unit comprises a servo motor, a planetary gear carrier, a connecting ring and a retainer, the servo motor is fixedly installed inside the driving unit, the planetary gear carrier is sleeved on a driving shaft of the servo motor, and the connecting ring is connected with the planetary gear carrier. The connecting ring is fixedly connected with the planetary gear carrier through a plurality of connecting rods, the holder and the connecting ring are coaxially installed, anchor rods are arranged at the ends, installed in the connecting ring, of the connecting rods, pressure sensors are arranged at the ends, close to the planetary gear carrier, of the anchor rods, and a voltage controller is arranged on the outer side of the servo motor. In the process that the motor transmits force to the connecting ring through the planetary gear carrier and the connecting rod, the connecting rod further bears pulling force for tensioning the connecting ring, the pulling force is applied to the side, close to the planetary gear carrier, of the anchor rod, in this way, the anchoring area of the connecting rod and the connecting ring is increased, and the pressure between the connecting rod and the connecting ring is accurately recognized; therefore, fine tuning of the working voltage of the motor is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical tools, in particular to a high-precision fine-tuning mechanism for a torque wrench. Background Art

[0002] The utility model patent with announcement number CN216152222U discloses a bidirectional linked torque wrench, including a middle shell, a cover is clamped on the inner side of the upper end of the middle shell, a fixed shell is clamped on the lower side of the cover, a pressure rod is arranged inside the fixed shell, a spring is sleeved on the outer side of the pressure rod, a first bite column is sleeved on the bottom end of the fixed shell, a second bite column is meshingly connected to one side of the first bite column, the bottom end of the pressure rod is fittedly connected to one end of the transmission block, a magnet is arranged inside the transmission block, the magnet is used for magnetically connecting a screwdriver, the screwdriver extends out of the lower cover, the top end of the pressure rod is inserted into the interior of the cover, a mounting hole is opened inside the middle shell, and the fixed shell is placed inside the mounting hole. When the wrench is in use, the upper cover is rotated to drive the first bite column and then the screwdriver to rotate. When the torque of the screwdriver during rotation is greater than the bite force between the first bite column and the second bite column, the first bite column overcomes the elastic tension of the spring and moves upward to allow the first bite column to rotate relative to the second bite column, so as to prevent the surface of the screw from being scratched due to excessive torque and to avoid damage to the screw. This method adjusts the torque in a mechanical way and cannot achieve high-precision stepless adjustment. Utility Model Content

[0003] The utility model aims to provide a high-precision fine-tuning mechanism for a torque wrench to solve the problems existing in the above-mentioned prior art.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A high-precision fine-tuning mechanism for a torque wrench comprises a wrench body and a driving unit arranged inside the wrench body, the driving unit comprising a servo motor, a planetary gear carrier, a connecting ring and a retaining frame, the servo motor is fixedly installed inside the driving unit, the planetary gear carrier is sleeved on the driving shaft of the servo motor, the connecting ring is fixedly connected to the planetary gear carrier through a plurality of axially evenly distributed connecting rods, the retaining frame is coaxially installed with the connecting ring, the connecting rod is plugged and fixed to the connecting ring, an anchor rod is provided at one end of the connecting rod plugged in the connecting ring, the axis of the anchor rod is arranged at an acute angle to the axis of the connecting rod, a pressure sensor is provided at one end of the anchor rod close to the planetary gear carrier, and a voltage controller located inside the wrench body is provided on the outside of the servo motor.

[0006] By adopting the above technical solution, the connecting rod is also subjected to the tensile force of tightening the connecting ring during the process in which the motor transmits the force to the connecting ring through the connecting rod by decelerating and applying torque through the planetary gear carrier, and because the connecting rod is fixed to the connecting ring by the anchor rod, the tensile force is applied to the side of the anchor rod close to the planetary gear carrier. In this way, the anchoring area of ​​the connecting rod and the connecting ring is increased, and the pressure between the connecting rod and the connecting ring can be accurately identified. Accurate pressure identification can ensure that the working voltage of the servo motor is adapted to the torque required to be provided, thereby achieving fine-tuning of the motor working voltage.

[0007] In a further embodiment, an automatic clutch is provided between the connecting ring and the retaining frame, and a completely closed lubricating oil working chamber is provided inside the planetary gear carrier.

[0008] By adopting the above technical solution, the automatic clutch is used to protect the servo motor and avoid overloading of the servo motor during the stopping phase after the operating voltage is reached.

[0009] In a further embodiment, the retaining frame is fixedly connected to the inner wall of the wrench body, the connecting ring can rotate axially relative to the retaining frame, and the outer wall of the retaining frame is provided with a rubber protective layer.

[0010] In a further embodiment, a plurality of heat dissipation holes are provided on the wrench body.

[0011] In a further embodiment, the anchor rod is plugged and fixed to the connecting rod, a plurality of through holes are evenly arranged axially on the outer wall of the connecting ring, and the anchor rod passes through the through holes and is plugged and fixed to the connecting rod.

[0012] In a further embodiment, a tin foil layer is provided inside the wrench body.

[0013] In summary, the utility model has the following beneficial effects:

[0014] 1. In the process that the motor transmits the force to the connecting ring through the connecting rod by decelerating and adding torque through the planetary gear carrier, the connecting rod also bears the tension of tightening the connecting ring. Because the connecting rod is fixed to the connecting ring by the anchor rod, the tension is applied to the side of the anchor rod close to the planetary gear carrier. In this way, the anchoring area of ​​the connecting rod and the connecting ring is increased, and the pressure between the connecting rod and the connecting ring can be accurately identified. Accurate pressure identification can ensure that the working voltage of the servo motor is adapted to the torque required to be provided, thereby achieving the effect of fine-tuning the working voltage of the motor;

[0015] 2. By arranging an automatic clutch between the connecting ring and the retaining frame, the automatic clutch can be used to protect the servo motor and avoid overload of the servo motor during the stop phase after the working voltage is reached. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a structural diagram used to reflect the connection position relationship between the connecting rod, anchor rod and connecting ring.

[0018] In the figure, 1. wrench body; 2. drive unit; 3. servo motor; 4. planetary gear frame; 5. connecting ring; 6. retaining frame; 7. connecting rod; 8. anchor rod. DETAILED DESCRIPTION

[0019] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0020] The same parts are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the attached Figure 1 In the description of this specification, the words "bottom" and "top", "inside" and "outside" refer to directions toward or away from a particular component geometry, respectively. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this specification, "plurality" means two or more, unless the direction of the center is otherwise clearly and specifically defined.

[0021] Embodiment 1:

[0022] like Figure 1-2 As shown, a high-precision fine-tuning mechanism of a torque wrench comprises a wrench body 1 and a driving unit 2 arranged inside the wrench body 1, the driving unit 2 comprises a servo motor 3, a planetary gear frame 4, a connecting ring 5 and a retaining frame 6, the servo motor 3 is fixedly installed inside the driving unit 2, the planetary gear frame 4 is sleeved on the driving shaft of the servo motor 3, the connecting ring 5 is fixedly connected to the planetary gear frame 4 through a plurality of axially evenly distributed connecting rods 7, the retaining frame 6 is coaxially installed with the connecting ring 5, the connecting rod 7 is plugged and fixed with the connecting ring 5, an anchor rod 8 is arranged at one end of the connecting rod 7 plugged in the connecting ring, the axis of the anchor rod 8 is arranged at an acute angle to the axis of the connecting rod 7, a pressure sensor is arranged at one end of the anchor rod 8 close to the planetary gear frame 4, a voltage controller located inside the wrench body 1 is arranged on the outside of the servo motor, the retaining frame 6 is fixedly connected to the inner wall of the wrench body 1, the connecting ring 5 can rotate axially relative to the retaining frame 6, the outer wall of the retaining frame 6 is provided with a rubber protective layer, and a plurality of heat dissipation holes are provided on the wrench body 1.

[0023] like Figure 1-2As shown, an automatic clutch is arranged between the connecting ring 5 and the retaining frame 6, a completely closed lubricating oil working chamber is arranged inside the planetary gear frame 4, the anchor rod 8 is plugged and fixed with the connecting rod 7, a plurality of through holes are evenly arranged axially on the outer wall of the connecting ring 5, the anchor rod 8 passes through the through holes and is plugged and fixed with the connecting rod 7, and a tin foil layer is arranged inside the wrench body 1.

[0024] Specific implementation process: In the process of the motor decelerating and adding torque to transfer the force to the connecting ring through the connecting rod through the planetary gear carrier, the connecting rod is also subjected to the tensile force of tightening the connecting ring, and because the connecting rod is fixed to the connecting ring through the anchor rod, the tensile force is applied to the side of the anchor rod close to the planetary gear carrier. In this way, the anchoring area of ​​the connecting rod and the connecting ring is increased, and the pressure between the connecting rod and the connecting ring can be accurately identified. Accurate pressure identification can ensure that the working voltage of the servo motor is adapted to the torque required to be provided, thereby achieving the effect of fine-tuning the working voltage of the motor. The automatic clutch detects that the rotating shaft of the servo motor has reached the working limit voltage. After being pressed and no longer rotating, the connection between the output shaft of the servo motor and the input shaft of the planetary gear carrier is disconnected, thereby protecting the servo motor and avoiding the problem of overload caused by the servo motor's internal temperature rising sharply due to the servo motor's shaft being unable to rotate under high voltage for a long time. Because the anchor rod is inserted obliquely into the connecting ring and is used to plug and lock the position relationship between the connecting rod and the connecting ring, the anchor rod evenly bears the tension of the connecting rod. When damage occurs, the anchor rod deforms first. Because the anchor rod is located inside the connecting ring, it will not bounce off after deformation, reducing the destructiveness to the inside of the equipment, so it is necessary to anchor the connecting rod through the anchor rod.

[0025] In the embodiments disclosed in the present invention, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connect" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments disclosed in the present invention can be understood according to specific circumstances.

[0026] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A torque wrench high-precision fine-tuning mechanism, comprising a wrench body (1) and a drive unit (2) arranged inside the wrench body (1), characterized in that: The drive unit (2) comprises a servo motor (3), a planetary gear carrier (4), a connecting ring (5) and a retaining frame (6); the servo motor (3) is fixedly mounted inside the drive unit (2); the planetary gear carrier (4) is sleeved on the drive shaft of the servo motor (3); the connecting ring (5) is fixedly connected to the planetary gear carrier (4) via a plurality of connecting rods (7) evenly distributed in the axial direction; the retaining frame (6) is coaxially mounted with the connecting ring (5); the connecting rod (7) is plugged and fixed to the connecting ring (5); an anchor rod (8) is arranged at one end of the connecting rod (7) plugged into the connecting ring (5); the axis of the anchor rod (8) is arranged at an acute angle to the axis of the connecting rod (7); a pressure sensor is arranged at one end of the anchor rod (8) close to the planetary gear carrier (4); and a voltage controller located inside the wrench body (1) is arranged on the outside of the servo motor.

2. A torque wrench high-precision fine-tuning mechanism according to claim 1, characterized in that: An automatic clutch is arranged between the connecting ring (5) and the retaining frame (6), and a completely closed lubricating oil working chamber is arranged inside the planetary gear frame (4).

3. The high-precision fine-tuning mechanism for a torque wrench according to claim 1, characterized in that: The retaining frame (6) is fixedly connected to the inner wall of the wrench body (1); the connecting ring (5) can rotate axially relative to the retaining frame (6); and the outer wall of the retaining frame (6) is provided with a rubber protective layer.

4. A torque wrench high-precision fine-tuning mechanism according to claim 1, characterized in that: The wrench body (1) is provided with a plurality of heat dissipation holes.

5. The high-precision fine-tuning mechanism for a torque wrench according to claim 1, characterized in that: The anchor rod (8) is plugged and fixed to the connecting rod (7); a plurality of through holes are evenly arranged axially on the outer wall of the connecting ring (5); the anchor rod (8) passes through the through holes and is plugged and fixed to the connecting rod (7).

6. A torque wrench high-precision fine-tuning mechanism according to claim 1, characterized in that: A tin foil layer is provided inside the wrench body (1).

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