An assembly fixture for use with a torque wrench in a confined space

Abstract

The utility model relates to the technical field of assembly fixture, more specifically relates to a kind of assembly fixture for the use of assembly torque wrench in the case of limited structure, including screw, wrench head, dowel and open sleeve, the open sleeve is wrapped on part, the dowel interference fit connection is in the open sleeve side surface through hole, then make dowel insert part outer diameter small hole, the inner hole of wrench head lower end is set in open sleeve, the screw is rotated into by the threaded hole of wrench head side surface setting, and the recess of open sleeve side surface is tightly clamped.Said wrench head upper end is equipped with four square structure.The utility model realizes the tightening assembly of the torque value according to design requirement in the case that one kind needs to be limited in structure and general torque wrench cannot directly tighten.

Description

Technical Field

[0001] This utility model relates to the field of assembly tooling technology, and more specifically to an assembly fixture used in conjunction with a torque wrench under structural constraints. Background Technology

[0002] When assembling a certain annular fuel manifold, a small nozzle component needs to be screwed into the manifold body in a free state using a threaded connection. To ensure a rigid seal, the nozzle component needs to be tightened with a certain torque so that it can completely fit against the end face of the manifold body. However, due to the complex structure of the component itself, there is a swirl groove structure on the outer diameter, and a stepped structure below the swirl groove on the outer diameter. The diameter is smaller than the outer diameter of the swirl groove, and the height is only 4.5mm. There is also a small round hole with a depth of 1mm. Using a general torque wrench, the front end of the torque wrench is a jaw structure or an internal hexagonal structure. In order to avoid affecting the performance, the swirl groove on the outer diameter must not be damaged in any way. The height of the stepped step is small. Therefore, a general torque wrench cannot achieve torque assembly of this part.

[0003] In order to meet the assembly requirements of the product, an assembly fixture was designed to be used with a torque wrench under the constraints of the structure. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides an assembly fixture that works in conjunction with a torque wrench under structural constraints, enabling tightening assembly to be performed according to the designed torque value when the structure is limited and a general torque wrench cannot be used for direct tightening.

[0005] The technical solution adopted by this utility model to solve the above problems is as follows: An assembly fixture for use with a torque wrench under structural constraints includes a screw, a wrench head, a pin, and an open sleeve. The open sleeve is fitted onto a part, and the pin is interference-fitted into a through hole on the side of the open sleeve, thereby allowing the pin to be inserted into a small hole on the outer diameter of the part. The inner hole at the lower end of the wrench head is fitted into the open sleeve, and the screw is screwed in through a threaded hole on the side of the wrench head and presses against a groove on the side of the open sleeve.

[0006] The upper end of the wrench head has a square structure.

[0007] The opening sleeve has a symmetrical two-body structure.

[0008] The two-part structure of the opening sleeve has grooves on its outer sides, and there are two screws.

[0009] A recessed hole is provided at the center of the inner end of the inner hole at the lower end of the wrench head.

[0010] This invention has the advantages of being able to be used with a torque wrench under structural constraints, having a simple overall structure, and low maintenance costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the present invention after assembly on the parts; Figure 2 This is a schematic diagram of the structure of the opening sleeve of this utility model; Figure 3 This is a schematic diagram of the structure of the pin of this utility model; Figure 4 This is a schematic diagram of the structure of the wrench head of this utility model; Figure 5 This is a schematic diagram of the screw structure of this utility model; Figure 6 This is a cross-sectional structural diagram of the part of this utility model.

[0012] In the picture: 1. Screw; 2. Wrench head; 3. Pin; 4. Opening sleeve. Detailed Implementation

[0013] like Figure 1-6 The embodiments of this utility model are described in detail below: An assembly fixture for use with a torque wrench under structural constraints includes a screw 1, a wrench head 2, a pin 3, and an open sleeve 4.

[0014] The pin 3 is connected to the open sleeve 4 by an interference fit. The screw 1 is connected by screwing into the threaded hole on the body of the wrench head 2. The open sleeve 4 with the pin 3 connected is used to clamp the outer diameter of the part, and the pin 3 is inserted into the small hole on the outer diameter of the part to connect the part and the open sleeve 4. Then, the screw 1 screwed into the wrench head 2 is used to tighten the long groove reserved on the outer diameter of the open sleeve 4. Before tightening the screw 1, the wrench head 2 can slide up and down on the groove on the outer diameter of the open sleeve 4. The part is clamped and fixed by clamping the open sleeve 4. At this time, after the torque wrench is adjusted to the specified torque, the four-sided structure on the wrench head 2 is tightened by the jaws of the torque wrench, and the preset torque is transmitted to the part through the layer-by-layer connection and rotation, so that the part is installed with the specified torque requirement.

[0015] The wrench head 2 is provided with a threaded hole, and the screw 1 can be screwed into and out of the wrench head 2 through the thread; the wrench head 2 has an inner diameter stepped structure, which makes it easy to restrict the position of the opening sleeve 2; the lower end of the wrench head 2 has a stepped hole, and the inner hole at the very center is a dotted hole, which avoids the nozzle part on the upper end face of the part being deformed or damaged by force.

[0016] The outer diameter of the open sleeve 4 is provided with a straight groove that runs through the upper and lower surfaces. The clamping position can be adjusted when the screw 1 is tightened or loosened according to the assembly needs, which is convenient for clamping and disassembly. Compared with the traditional structure with a pre-reserved clamping hole on the outer diameter, it is more convenient for the disassembly and installation of the open sleeve 4, and increases the clamping adaptability of the open sleeve 4 when it moves up and down.

[0017] The two-part open sleeve 4 structure allows for direct visual insertion of the pin 3 on one half of the open sleeve 4 into the small hole on the part during installation, followed by clamping the other half of the open sleeve 4 together to secure the part. This significantly reduces the difficulty of accurately inserting the pin 3 into the small hole due to the randomness of the hole position when the part is screwed into the assembly.

[0018] Due to structural limitations during component assembly and the small diameter of the small holes on the components, the diameter of the matching pins 3 is also small. If a traditional one-piece structure is used, the pins 3 need to protrude a long portion to avoid interference. When tightening with a torque wrench, the long protruding length of the pins 3 and the poor structural rigidity can cause bending deformation or breakage, which cannot meet the assembly requirements. However, by adopting a two-piece open sleeve 4 structure, the pins are interference-fitted into one open sleeve 4, allowing the pins 3 to be inserted into the small holes on the outer diameter of the component while being close to the outer diameter of the component. This minimizes the protruding length of the pins 3, improves the rigidity of the structure, and minimizes the deformation and loss of the pins.

[0019] Because the torque of the parts is large during assembly, and the structure is limited, the torque transmission pin 3 is easily damaged. This structure can continue to be used by simply replacing the open sleeve 4 and the pin 3. The maintenance cost is low and there is no need to scrap the whole set and redo it.

[0020] The operating steps for using this application are as follows: S1. Connect pin 3 to the open sleeve 4 via an interference fit. S2. Using the open sleeve 4 with pin 3 on one side, visually align it with the small hole on the outer diameter of the part and attach it tightly.

[0021] S3. Fit the other side opening sleeve 4 tightly against the outer diameter of the part.

[0022] S4. Screw the screw 1 through the threaded hole of the wrench head 2 to the predetermined position.

[0023] S5 inserts the inner diameter of the assembled wrench head 2 onto the outer diameter of the open sleeve 4, and rotates the wrench head 2 circumferentially to adjust it so that the screw 1 corresponds to the groove on the outer diameter of the open sleeve 4. Continue to screw in the screw 1 until the open sleeve 4 is tightened. S6. Use a universal torque wrench with jaws to clamp the square structure on the wrench head 2 and tighten it to the specified torque until the specified torque value is reached, then continue to apply tightening force.

[0024] S7. Remove the torque wrench and unscrew screw 1 until it disengages from the outer diameter groove on the open sleeve 4.

[0025] S8. Remove wrench 2.

[0026] S9 removes the opening sleeve 4, completing the parts assembly and ending the process.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. The present invention is not limited to the examples described above. Any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. An assembly fixture for use with a torque wrench under structural constraints, characterized in that: The device includes a screw (1), a wrench (2), a pin (3), and a sleeve (4). The sleeve (4) is fitted onto the part. The pin (3) is interference-fitted into the through hole on the side of the sleeve (4), allowing the pin (3) to be inserted into the small hole on the outer diameter of the part. The inner hole at the lower end of the wrench (2) is fitted into the sleeve (4). The screw (1) is screwed in through the threaded hole on the side of the wrench (2) and presses against the groove on the side of the sleeve (4).

2. The assembly fixture for use with a torque wrench under structural constraints according to claim 1, characterized in that: The upper end of the wrench (2) is provided with a square structure.

3. The assembly fixture for use with a torque wrench under structural constraints according to claim 1, characterized in that: The opening sleeve (4) is a symmetrical two-body structure.

4. The assembly fixture for use with a torque wrench under structural constraints according to claim 3, characterized in that: The two sides of the opening sleeve (4) are provided with grooves, and there are two screws (1).

5. An assembly fixture for use with a torque wrench under structural constraints, as described in claim 1, characterized in that: The lower end of the wrench (2) has a recessed hole at the center of the inner end of the inner hole.

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