A force limiting tightening device for soft material parts

Abstract

This utility model provides a force-limiting tightening device for soft material parts, including: a base (1), a pressure plate (2), a guide pin (3), an adjusting screw (4), and a set screw (5); the base (1) is U-shaped, and a guide pin hole and a screw hole are provided on one side wall; the pressure plate (2) is connected to the guide pin (3), and the pressure plate (2) can be moved linearly by rotating the adjusting screw (4), thereby adjusting the size of the U-shaped opening of the base (1). By rotating the adjusting screw to drive the pressure plate to move linearly, the size of the wrench opening can be adjusted. When changing the tightening torque of the part, the adjusting screw adjusts the position of the movable pressure plate to fit the workpiece, and finally tightens the adjusting screw to eliminate the gap between the wrench head and the workpiece, which can satisfy clamping and tightening with large torque without damaging the appearance of the part. Disassembly and use are extremely convenient.

Description

Technical Field

[0001] This utility model belongs to the field of auxiliary devices for deep hole machining tools in mechanical processing, and relates to a force-limiting tightening device for soft material parts. Background Technology

[0002] For existing nut fixing installations, an adjustable wrench is usually used.

[0003] However, in the aerospace field, some parts have anodized surfaces, and existing adjustable wrenches cannot simultaneously protect the appearance of anodized parts and meet special requirements such as not allowing indentations or scratches. Moreover, existing adjustable wrenches cannot determine the torque. Utility Model Content

[0004] Purpose of the utility model: To provide a force-limiting tightening device for soft material parts, which can achieve multiple functions such as clamping, tightening and protecting the coating of parts of different sizes by reasonably setting the radial stroke adjustment of the wrench head.

[0005] This utility model provides a force-limiting tightening device for soft material parts, including: a base 1, a pressure plate 2, a guide pin 3, an adjusting screw 4, and a set screw 5; The base 1 is U-shaped, and a guide pin hole and a screw hole are provided on one side wall; A guide pin 3 is connected to the pressure plate 2, and the guide pin 3 is inserted into the guide pin hole from the inner surface of the side wall; The pressure plate 2 is provided with through holes corresponding to the screw holes and set screws. The adjusting screw 4 is inserted into the screw holes and through holes from the outer surface of the side wall. The tail end of the adjusting screw 4 is provided with an annular groove, and the set screw is locked in the annular groove. By rotating the adjusting screw 4, the pressure plate 2 can be moved linearly, thereby adjusting the size of the U-shaped opening of the base 1. The U-shaped bottom of the base 1 is provided with a torque wrench connection hole 6 for connecting a torque wrench.

[0006] Optionally, the thickness of the base 1 is less than the thickness of the soft material part.

[0007] Optionally, a protective U-shaped flange is provided on one side of the base 1 to prevent the base 1 from contacting the workpiece that holds the soft material parts.

[0008] Optionally, the U-shaped bottom of the base 1 has a circular groove for connecting a torque wrench; The side wall of the groove is provided with fixing holes for fixing torque wrenches.

[0009] Optionally, the U-shaped profile can be matched to the profile of parts made of soft materials.

[0010] Optionally, the number of guide pins 3 is two.

[0011] This invention relates to an axial clamping force-limiting device for soft material parts, particularly useful in assembly and adjustment processes when aluminum nuts require a large torque for tightening, while simultaneously protecting the anodized coating on the part's surface from indentations, scratches, or other defects. This invention achieves multiple functions—clamping, tightening, and protecting the coating—by rationally adjusting the radial travel of the wrench head. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of the force-limiting tightening device for soft material parts according to this utility model; Figure 2 This is a side view of the force-limiting tightening device for soft material parts according to this utility model; Explanation of reference numerals in the attached figures: 1-Guide sleeve, 2-Guide sleeve base, 3-Shock-absorbing guide strip, 4-Locking nut, 5-BTA cutter head, 6-BTA cutter bar. Detailed Implementation

[0013] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings: The present invention will be described in further detail with reference to specific embodiments, but this is not intended to limit the present invention.

[0014] This utility model provides a force-limiting tightening device for soft material parts, which consists of a base, a pressure plate, a guide pin, an adjusting screw, and a set screw.

[0015] like Figure 1 As shown, the base 1 has a "U" shaped structure, and the upper and lower mounting holes are guide pin holes, which are formed in one process.

[0016] The U-shaped structure has guide pin holes and screw holes on one side wall; A guide pin 3 is connected to the pressure plate 2, and the guide pin 3 is inserted into the guide pin hole from the inner surface of the side wall; The pressure plate 2 is provided with through holes corresponding to the screw holes and set screws. The adjusting screw 4 is inserted into the screw holes and through holes from the outer surface of the side wall. The tail end of the adjusting screw 4 is provided with an annular groove, and the set screw is locked in the annular groove. By rotating the adjusting screw 4, the pressure plate 2 can be moved linearly, thereby adjusting the size of the U-shaped opening of the base 1.

[0017] like Figure 2 As shown, the bottom mounting hole is a torque wrench connection hole.

[0018] Optionally, the thickness of the base 1 is less than the thickness of the soft material part.

[0019] Optionally, a protective U-shaped flange is provided on one side of the base 1 to prevent the base 1 from contacting the workpiece that holds the soft material parts.

[0020] Specific implementation methods: (1) Turn the adjusting screw counterclockwise to move the pressure plate outward, thereby increasing the opening of the wrench head.

[0021] (2) By using a reasonably set limiting platform (protective U-shaped flange), the wrench head is restricted and fixed in a suitable position on the nut to avoid friction between the wrench head and the workpiece during tightening, which could damage the parts.

[0022] (3) Align the wrench head with the nut and turn the adjusting screw clockwise to move the pressure plate inward, so that the opening of the wrench head is reduced until the pressure plate is in contact with the nut, and then tighten the adjusting nut.

[0023] (4) Tighten the nut to a torque of 25-30 N·m using a torque wrench.

[0024] (5) Tighten the adjusting screw in the opposite direction to move the pressure plate outward, thereby increasing the opening of the wrench head and removing the wrench head.

[0025] This invention enables product assembly to have high reliability and ensures the integrity of product tightening and appearance protection. This project is widely used in fighter jets, transport aircraft, and civil aircraft.

[0026] When assembling a certain series of rudder return mechanisms, the clevis sleeve needs to be slowly screwed into the housing to ensure no axial movement at either end of the mechanism. Finally, the nut is tightened on the clevis sleeve with a torque of 25-30 N·m. Due to the gap between the wrench head and the nut, and the fact that the part is made of relatively soft aluminum alloy, the wrench head makes point contact with the workpiece when tightening. With a little force, indentation marks will appear at the two contact points. Furthermore, when the wrench head gets stuck on the workpiece, friction will occur, and scratches will appear on the workpiece surface, making it impossible to guarantee the installation requirements. This process takes at least 20 minutes and requires two people to operate the entire process.

[0027] This tightening force-limiting device, through the reasonable setting of the limiting platform, restricts and fixes the wrench head in the appropriate position of the nut, avoiding friction between the wrench head and the workpiece during tightening and preventing damage to the parts, thus achieving rapid positioning. The adjusting screw is used to adjust the opening position to fit the workpiece, eliminating the gap between the wrench head and the workpiece, ensuring surface-to-surface contact. During installation, the opening can be enlarged, and then gradually pressed to fit the workpiece, strictly controlling the possibility of scratches caused by friction between the tool and the workpiece. Finally, a torque wrench is used for tightening, with a tightening torque of 25-30 N·m. The entire process takes only 2-3 minutes, requires only one person, and increases efficiency by 70%.

[0028] This invention borrows the principle of an open-end adjustable wrench head, and rationally sets up two guide pins to connect the pressure plate and the wrench base as one unit. By rotating the adjusting screw, the pressure plate moves linearly, thus adjusting the wrench opening size. When changing parts and tightening torque, the adjusting screw adjusts the position of the movable pressure plate to fit the workpiece, and finally tightening the adjusting screw eliminates the gap between the wrench head and the workpiece. This satisfies the requirements for clamping and tightening with large torque without damaging the appearance of the parts, and is extremely convenient to disassemble and use.

[0029] 1) By reasonably setting two guide pins, the pressure plate and the wrench base are connected as one unit, and the pressure plate is driven to make linear movement by rotating the adjusting screw to adjust the size of the wrench opening to adapt to parts with different tolerances; 2) The wrench opening size can be adjusted by adjusting the screw to make it fit tightly with the workpiece. Tightening the adjusting screw eliminates the gap between the wrench head and the workpiece. When applying torque, the two form a surface-to-surface contact. There is no relative slippage between the clamping surface of the wrench head and the two clamped surfaces of the nut, thereby protecting the coating on the surface of the nut parts. 3) By reasonably setting the limit plate, the wrench head is restricted to the appropriate position of the nut to avoid friction and scratching between the wrench head and the workpiece during tightening, which would damage the coating on the surface of the parts. 4) It can tighten with a large torque without damaging the appearance of the parts; 5) This device is simple and convenient to use, highly applicable, and has good potential for widespread adoption.

[0030] The present invention has been described in detail with reference to the above embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, and such modifications or equivalent substitutions should be covered within the scope of the claims.

Claims

1. A force-limiting tightening device for soft material parts, characterized in that, include: Base (1), pressure plate (2), guide pin (3), adjusting screw (4) and set screw (5); The base (1) is U-shaped, and a guide pin hole and a screw hole are provided on one side wall; A guide pin (3) is connected to the pressure plate (2), and the guide pin (3) is inserted into the guide pin hole from the inner surface of the side wall; The pressure plate (2) is provided with through holes corresponding to the screw holes and set screws. The adjusting screw (4) is inserted into the screw holes and through holes from the outer surface of the side wall. The tail end of the adjusting screw (4) is provided with an annular groove, and the set screw is locked in the annular groove. By rotating the adjusting screw (4), the pressure plate (2) can be moved linearly, thereby adjusting the size of the U-shaped opening of the base (1). The base (1) has a torque wrench connection hole (6) at its U-shaped bottom for connecting a torque wrench.

2. The force-limiting tightening device for soft material parts according to claim 1, characterized in that, The thickness of the base (1) is less than the thickness of the soft material parts.

3. The force-limiting tightening device for soft material parts according to claim 2, characterized in that, A protective U-shaped flange is provided on one side of the base (1) to prevent the base (1) from contacting the workpiece that fixes the soft material parts.

4. The force-limiting tightening device for soft material parts according to claim 1, characterized in that, The base (1) has a circular groove at its U-shaped bottom for connecting a torque wrench; The side wall of the groove is provided with fixing holes for fixing torque wrenches.

5. The force-limiting tightening device for soft material parts according to claim 1, characterized in that, The U-shaped shape matches the shape of parts made of soft materials.

6. The force-limiting tightening device for soft material parts according to claim 1, characterized in that, The number of guide pins (3) is two.

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