Electric torque wrench counterforce arm mounting structure

Abstract

The utility model discloses a kind of electric torque wrench counterforce arm mounting structures, intermediate shell is connected with front end shell by extension section, intermediate shell other end is connected with rear end shell, and extension cylinder is coaxially provided in the front end shell away from one end of intermediate shell, sawtooth is provided in the extension cylinder along the circumferential direction, sawtooth is all set with clamping groove, and one end of counterforce arm is provided with connecting ring, and the inner wall of connecting ring is set with gear slot along the circumferential direction, connecting ring is sleeved with the extension cylinder of front end shell, the gear slot of connecting ring is matched with the sawtooth of extension cylinder, and snap spring is arranged at the clamping groove of the sawtooth of extension cylinder, and snap spring is pressed on the outside surface of connecting ring, the utility model is reasonable in structure, and counterforce arm is positioned and matched with the sawtooth of extension cylinder through the gear slot of connecting ring, to prevent rotation, and then snap spring is matched with the clamping groove of sawtooth, to realize the limiting of counterforce arm, greatly improve stability while being convenient to adjust, and angle is more delicate than the mounting structure of positioning pin.

Description

Technical Field

[0001] This utility model relates to the field of electric torque wrench reaction arm installation technology, specifically an electric torque wrench reaction arm installation structure. Background Technology

[0002] The internal structure of an electric torque wrench is the core of its high-precision torque control. It is essentially a sophisticated "mechatronics" system that combines mechanical transmission, electronic sensing, and intelligent control. The adjustment of the reaction arm angle of an electric torque wrench is to ensure that the fulcrum (foot) of the reaction arm can be firmly pressed against the optimal reaction force plane, which is the key to ensuring that the wrench can apply torque stably, accurately, and safely.

[0003] Traditional reaction arm installation structures mostly use locking rings and locating pins for positioning. However, the locking ring has poor structural stability, while the locating pin, a type of pin structure, has a large angle adjustment range and low precision. Therefore, there is an urgent need for an improved technology to solve this problem in the existing technology. Summary of the Invention

[0004] The purpose of this utility model is to provide a reaction arm mounting structure for an electric torque wrench to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an electric torque wrench reaction arm mounting structure, comprising a front end housing, a middle housing, a rear end housing, and a reaction arm. One end of the middle housing has an extension section, which connects to the front end housing. The other end of the middle housing is connected to the rear end housing. The front end housing is a cylindrical structure. An extension cylinder is coaxially arranged at the end of the front end housing away from the middle housing. The extension cylinder has serrations along its circumference, and each serration has a slot. One end of the reaction arm has a connecting ring, and the inner wall of the connecting ring has serrations along its circumference. The connecting ring is sleeved with the extension cylinder of the front end housing. The serrations of the connecting ring engage with the serrations of the extension cylinder. A retaining spring is provided at the slot of the serration of the extension cylinder, and the retaining spring is pressed against the outer surface of the connecting ring.

[0006] Preferably, the present invention provides an electric torque wrench reaction arm mounting structure, wherein a planetary gear reducer is provided inside the intermediate housing, a motor is provided at one end of the planetary gear reducer, the output shaft of the motor is connected to the input shaft of the planetary gear reducer, a connecting block is connected to the output shaft of the planetary gear reducer, the motor is located inside the rear housing, and the connecting block is located outside the front housing.

[0007] Preferably, the present invention provides an electric torque wrench reaction arm mounting structure, wherein the rear housing is provided with a handle, the bottom of the handle is provided with a battery mounting base, and the handle is also provided with a switch mounting groove.

[0008] Preferably, the present invention provides an electric torque wrench reaction arm mounting structure, wherein the front end housing is fastened to the extension section by bolts.

[0009] Preferably, the electric torque wrench reaction arm mounting structure provided by this utility model includes a rear end housing consisting of two half-housings, which are fastened together by bolts.

[0010] Compared with the prior art, the beneficial effects of this utility model are: One end of the reaction arm is equipped with a connecting ring, the inner wall of which is provided with a toothed groove. The front end housing is provided with an extension cylinder, the outer periphery of which is provided with serrations, each of which has a slot. The reaction arm is positioned and engaged with the serrations of the extension cylinder through the toothed groove of the connecting ring to prevent rotation. The reaction arm is then limited by the engagement of a retaining spring with the slots of the serrations. This reaction arm installation structure is convenient for adjustment, greatly improves stability, and the angle is more precise than that of the positioning pin installation structure. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 This is a schematic diagram of the front shell structure; Figure 4 This is a schematic diagram of the reaction arm structure.

[0012] In the diagram: front housing 1, middle housing 2, rear housing 3, reaction arm 4, extension cylinder 5, sawtooth 6, slot 7, connecting ring 8, tooth groove 9, snap ring 10, extension section 11, planetary gear reducer 12, motor 13, connecting block 14, handle 15, battery mounting base 16, switch mounting slot 17. Detailed Implementation

[0013] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. It should be noted that in the description of this utility model, the terms "inner", "outer", "upper", "lower", "both sides", "one end", "the other end", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0014] Please see Figure 1 This utility model provides a technical solution: an electric torque wrench reaction arm installation structure, including a front housing 1, a middle housing 2, a rear housing 3 and a reaction arm 4. One end of the middle housing 2 is provided with an extension section 11, and the middle housing 2 is connected to the front housing 1 through the extension section 11. The front housing 1 is fastened to the extension section 11 by bolts to realize the installation and disassembly of the front housing 1. The other end of the middle housing 2 is connected to the rear housing 3. The front housing 1 is a cylindrical structure. An extension cylinder 5 is coaxially provided at the end of the front housing 1 away from the middle housing 2. The extension cylinder 5 is provided with serrations 6 along the circumferential direction. Each serration 6 is provided with a slot 7. One end of the reaction arm 4 is provided with a connecting ring 8. The inner wall of the connecting ring 8 is provided with a toothed groove 9 along the circumferential direction. The connecting ring 8 is sleeved with the extension cylinder 5 of the front housing 1. The toothed groove 9 of the connecting ring 8 cooperates with the serrations 6 of the extension cylinder 5. A retaining spring 10 is provided at the slot 7 of the serrations 6 of the extension cylinder 5. The retaining spring 10 is pressed against the outer surface of the connecting ring 8. The intermediate housing 2 houses a planetary gear reducer 12. A motor 13 is installed at one end of the planetary gear reducer 12. The output shaft of the motor 13 is connected to the input shaft of the planetary gear reducer 12. A connecting block 14 is connected to the output shaft of the planetary gear reducer 12. The motor 13 is located inside the rear housing 3, and the connecting block 14 is located outside the front housing 1. The motor 13 drives the planetary gear reducer 12 to rotate, and the output shaft of the planetary gear reducer 12 drives the connecting block 14 to rotate. In use, the connecting block 14 is used to install tools such as sleeves and cutting heads with bolts. The rear housing 3 is provided with a handle 15 for easy gripping. The bottom of the handle 15 is provided with a battery mounting base 16 for installing a lithium battery. The handle 15 is also provided with a switch mounting slot 17 for installing a switch. The rear housing 3 is composed of two half-housings, which are fastened together by bolts to facilitate the opening and removal of the electric torque wrench located at the motor 13. The circuit board is also installed inside the rear housing 3.

[0015] Installation method and operating principle: Install the planetary gear reducer 12 connected to the motor 13 inside the intermediate housing 2 and its extension section 11. The motor 13 is located inside the rear housing 3. Then, fit the front housing 1 onto the extension section 11, inserting the groove of the front housing 1 into the protrusion of the extension section 11, and secure the front housing 1 and extension section 11 together with bolts. Finally, depending on the application scenario, fit the connecting ring 8 of the reaction arm 4 onto the extension cylinder 5 of the front housing 1, and make the tooth groove 9 of the connecting ring 8 engage with the serration 6 of the extension cylinder 5. Place the retaining ring 10 into the retaining groove 7 of the serration 6. At this time, the connecting ring 8 is limited by the retaining ring 10, completing the installation. Of course, before use, the switch must be installed in the switch mounting slot 17 of the rear housing 3, and the lithium battery must be installed in the battery mounting base 16. The lithium battery, switch, and motor 13 are all connected to the internal circuit board through wires. When the angle needs to be adjusted, use a tool to pry out the retaining ring 10 and disengage it from the slot 7, pull out the connecting ring 8 of the reaction arm 4, adjust the angle, and reconnect it to the extension cylinder 5. The engagement of the toothed groove 9 and the sawtooth 6 prevents the reaction arm 4 from rotating. Then, reposition the retaining ring 10 into the slot 7 of the sawtooth 6 to complete the angle adjustment of the reaction arm 4. This utility model has a reasonable structure. One end of the reaction arm 4 is provided with a connecting ring 8, and the inner wall of the connecting ring 8 is provided with a toothed groove 9. The front housing 1 is provided with an extension cylinder 5, and the outer periphery of the extension cylinder 5 is provided with sawtooth 6, each of which has a slot 7. The reaction arm 4 is positioned and engaged with the sawtooth 6 of the extension cylinder 5 through the toothed groove 9 of the connecting ring 8 to prevent rotation. The retaining ring 10 engages with the slot 7 of the sawtooth 6 to limit the movement of the reaction arm 4. This reaction arm 4 installation structure is convenient for adjustment, greatly improves stability, and provides a more precise angle adjustment than the positioning pin installation structure.

[0016] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0017] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications and equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A reaction arm mounting structure for an electric torque wrench, characterized in that: It includes a front shell (1), a middle shell (2), a rear shell (3), and a reaction arm (4). One end of the middle shell (2) is provided with an extension section (11), and the middle shell (2) is connected to the front shell (1) through the extension section (11). The other end of the middle shell (2) is connected to the rear shell (3). The front shell (1) is a cylindrical structure. An extension cylinder (5) is coaxially provided at the end of the front shell (1) away from the middle shell (2). The extension cylinder (5) is provided with serrations (6) along the circumferential direction. The saw teeth (6) are all provided with slots (7), and a connecting ring (8) is provided at one end of the reaction arm (4). The inner wall of the connecting ring (8) is provided with a toothed groove (9) along the circumferential direction. The connecting ring (8) is sleeved with the extension cylinder (5) of the front end housing (1). The toothed groove (9) of the connecting ring (8) cooperates with the saw teeth (6) of the extension cylinder (5). A retaining spring (10) is provided at the slot (7) of the saw teeth (6) of the extension cylinder (5). The retaining spring (10) is pressed against the outer surface of the connecting ring (8).

2. The electric torque wrench reaction arm mounting structure according to claim 1, characterized in that: The intermediate housing (2) is equipped with a planetary gear reducer (12). A motor (13) is provided at one end of the planetary gear reducer (12). The output shaft of the motor (13) is connected to the input shaft of the planetary gear reducer (12). A connecting block (14) is connected to the output shaft of the planetary gear reducer (12). The motor (13) is located inside the rear housing (3), and the connecting block (14) is located outside the front housing (1).

3. The electric torque wrench reaction arm mounting structure according to claim 1, characterized in that: The rear housing (3) is provided with a handle (15), the bottom of the handle (15) is provided with a battery mounting base (16), and the handle (15) is also provided with a switch mounting slot (17).

4. The electric torque wrench reaction arm mounting structure according to claim 1, characterized in that: The front housing (1) is fastened to the extension section (11) by bolts.

5. The electric torque wrench reaction arm mounting structure according to claim 1, characterized in that: The rear housing (3) is composed of two half-housing units, which are fastened together by bolts.

Images