Locking force detection device of disc screw and use method thereof

Abstract

The invention discloses a disc screw locking force detection device and a use method thereof. The disc screw locking force detection device is compact in structure and convenient and fast to operate. Comprising a body, a connecting rod and a pressing piece, the body is provided with an inner cavity with a side opening, one end of the body is provided with a threaded hole, and the other end of the body is provided with a receding round hole used for containing a nut of a disc screw; the pressing sheet is U-shaped, is inserted into the inner cavity of the main body, and is used for being clamped with the disc nut piece; one end of the connecting rod is a screw rod, the screw rod end of the connecting rod is matched with the threaded hole of the main body, the screw rod end of the connecting rod is used for applying pressure to a nut of the disc screw and axially pressing the disc screw, the other end of the connecting rod is a wrench twisting end, a square counter bore is formed in the wrench twisting end, and the square counter bore is used for being matched with an outer square connector head of the digital display torque wrench.

Description

Technical Field

[0001] The present invention relates to the technical field of locking force detection, and in particular to a locking force detection device for a disc screw and a use method thereof. Background Art

[0002] Threaded connection technology is widely used in the machinery manufacturing industry. The firmness requirements of threaded connections are different. It is common for screws to loosen due to vibration during the use of the machinery. The size of the static locking force after the screw is tightened is an important prerequisite indicator for determining the difficulty of screw loosening. The locking force of conventional screws can be easily detected using a digital torque wrench, but it is difficult to detect the locking force of unconventional threaded connection workpieces such as the two cylindrical workpieces listed in this article after tightening through threaded connections. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a locking force detection device for a disc screw and a method for using the same, which has a compact structure and is convenient and quick to operate.

[0004] The object of the present invention is achieved in that: A locking force detection device for a disc screw, wherein the workpiece to be detected comprises a disc nut and a disc screw, wherein a positioning disc is arranged at the connecting end of the disc nut, the disc screw and the disc nut are threadedly connected, and the nut of the disc screw and the positioning disc of the disc nut are abutted and positioned, and the device comprises a main body, a connecting rod, and a pressing piece. The main body has an inner cavity with a side opening, a threaded hole is provided at one end of the main body, and a clearance hole is provided at the other end, the threaded hole and the clearance hole are coaxial and communicated with the inner cavity of the main body, and the clearance hole is used for installing a nut of a disc screw; The pressing piece is U-shaped and inserted into the inner cavity of the main body from the side opening. The pressing piece is used to clamp with the disc nut through the slot. In the clamping state, the two ends of the pressing piece are respectively in contact with the end surface of the inner cavity of the main body and the back of the positioning disc of the disc nut. One end of the connecting rod is a screw rod, and the screw rod end of the connecting rod cooperates with the threaded hole of the main body. The screw rod end of the connecting rod is used to apply pressure to the nut of the disc screw to axially compress the disc screw. In the compressed state, the clamping force of the connecting rod on the disc screw is greater than the threaded connection locking force of the workpiece to be measured. The other end of the connecting rod is a wrench twisting end, and the wrench twisting end is provided with a square countersunk hole, and the square countersunk hole is used to cooperate with the external square interface head of the digital torque wrench.

[0005] Preferably, the outer contour of the pressing piece is in the shape of a rectangular parallelepiped, the inner cavity of the main body is a square hole, and the pressing piece and the inner cavity of the main body are gap-matched to form a positioning for the pressing piece.

[0006] Preferably, a rubber gasket is provided between the screw rod end of the connecting rod and the nut of the disc screw.

[0007] Preferably, the outer peripheral surface of the twisting end of the wrench is a square, and the outer peripheral surface of the twisting end of the wrench is used to cooperate with the adjustable wrench.

[0008] A method for using a locking force detection device for a disc screw, Install the nut of the disc screw into the inner cavity of the main body through the circular hole; Insert the pressing piece into the inner cavity of the main body from the side opening, and the pressing piece is clamped with the disc nut through the slot, so that the two ends of the pressing piece are respectively in contact with the end surface of the inner cavity of the main body and the back of the positioning disc of the disc nut to be positioned; Use an adjustable wrench to twist the wrench end of the connecting rod, so that the screw end of the connecting rod applies pressure to the nut of the disc screw, axially compressing the disc screw. The pressing force of the connecting rod on the disc screw is greater than the threaded connection locking force of the workpiece being measured. Under the action of the pressing force, the connecting rod and the disc screw can rotate synchronously, while the disc nut, the pressing piece, and the main body remain stationary. During testing, insert the external square interface head of the digital torque wrench into the square countersunk hole of the connecting rod, adjust the force measuring direction of the torque wrench to be consistent with the direction in which the disc screw is screwed out, turn the torque wrench, and the force when the disc screw is screwed out is the locking force of the disc screw.

[0009] Due to the adoption of the above technical solution, compared with the conventional thread locking force detection technology, the present invention has the following beneficial effects: The present invention is suitable for detecting the locking force of disc screws. During the detection, the disc screw cap end of the workpiece to be detected is inserted into the circular hole at the lower part of the first body of the device, and at the same time, the pressing plate of the third body of the device is inserted into the square hole on the side of the first body and from below the disc screw cap. The square groove of the pressing plate plays a role in giving way to the workpiece. Then, the connecting rod of the second body of the device is rotated and pressed to tighten the detected workpiece with an adjustable wrench (the force of the adjustable wrench when rotating and pressing the workpiece must be greater than the locking force of the threaded connection of the workpiece to be measured). In order to avoid crushing the workpiece, a rubber gasket can be placed above the workpiece disc screw to complete the tight connection between the device and the detected workpiece, and the outer square joint of the torque wrench is inserted into the inner square countersunk hole of the connecting rod of the second body of the device. After the force measuring direction of the torque wrench is adjusted to be consistent with the direction in which the workpiece to be measured is rotated out, the wrench is moved to complete the detection.

[0010] The shapes and sizes of the three main bodies, connecting rods and pressing plates constituting the present invention can be designed accordingly according to the structural shapes and sizes of different disc-type screws. Through the same assembly structure of the device, it can meet the locking force detection of disc-type screws of different sizes, making the present invention universal.

[0011] It has a compact structure, convenient and quick operation, does not damage the workpiece, has a firm and stable connection, and can realize the detection of the locking force of disc-shaped screws. It can quickly and reliably connect the workpiece to be tested with the device, and then use a digital display torque wrench with adjustable direction and torque to realize the fast and accurate detection of the locking force of the cylindrical screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Schematic diagram of the workpiece being measured; Figure 3 for Figure 1 The structural diagram of the main body; Figure 4 for Figure 1 A schematic diagram of the structure of the middle connecting rod; Figure 5 for Figure 1 Schematic diagram of the structure of the medium-pressure tablet.

[0013] Reference numerals In the accompanying drawings, 1 is a main body; 2 is a connecting rod; 3 is a pressure plate; 4 is a workpiece to be measured; 41 is a disc screw; 42 is a disc nut; and 43 is a positioning disc. DETAILED DESCRIPTION

[0014] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0015] In this embodiment, the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "upper end", and "lower end" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed or operate in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0016] like Figures 1 to 5 A locking force detection device for a disc screw is provided. Aiming at detecting the locking force after two cylindrical workpieces are tightened by threaded connection, the present invention provides a locking force detection device for a disc screw. The device has a compact structure and is convenient and quick to operate. The workpiece to be detected can be quickly and reliably connected to the device, and then a digitally displayed torque wrench with adjustable direction and torque can be used to realize rapid and accurate detection of the locking force of the cylindrical screw.

[0017] The two cylindrical workpieces are a disc nut and a disc screw. The connecting end of the disc nut is provided with a positioning disc. The disc screw is threadedly connected with the disc nut. The nut of the disc screw is in contact with the positioning disc of the disc nut for positioning.

[0018] The present invention includes a main body 1, a connecting rod 2, and a pressing plate 3. The main body 1 is a cavity structure with circular holes on the upper and lower parts and square holes on the side. The circular hole on the upper part of the main body 1 is a threaded hole, which is connected to the square hole cavity on the side of the main body 1 and is used to install the connecting rod 2. The circular hole on the lower part of the main body 1 is connected to the square hole cavity on the side of the main body, which is used to load the workpiece to be measured. The size of the circular hole should be larger than the diameter of the disc screw cap of the workpiece to be measured. The connecting rod 2 is a round body structure, the lower end is an external threaded cylindrical screw, the thread matches the threaded hole of the main body 1, and the upper end is a cylinder with an inner square countersunk hole, and the inner square countersunk hole matches the size of the outer square interface head of the digital torque wrench. The pressing plate 3 is a rectangular parallelepiped structure with a slot in the middle. The length and width of its appearance should be smaller than the size of the square hole on the side of the main body 1, the height plus the thickness of the nut of the workpiece to be measured should be smaller than the height of the square hole of the main body 1, and the width of the middle square groove should be slightly larger than the cylindrical diameter of the screw of the workpiece to be measured.

[0019] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, before testing, insert the disc screw end of the workpiece to be tested into the round hole at the bottom of the device body 1, and insert the pressing plate 3 into the square hole on the side of the body 1 and from below the disc screw cap of the workpiece to be tested. The square groove of the pressing plate serves to make way for the workpiece, and then use an adjustable wrench to press the device connecting rod 2 to test the workpiece (a rubber gasket can be placed above the workpiece disc screw to avoid crushing the workpiece), completing the tight connection between the device and the test workpiece. During testing, insert the square interface head of the torque wrench into the square countersunk hole of the device connecting rod 2, adjust the torque wrench force measurement direction to the same direction as the workpiece to be tested, and then pull the wrench to complete the test.

[0020] The patent of the present invention is used to realize reliable detection of the locking force of the threaded connection. The force when the connecting rod is rotated and pressed against the workpiece by the adjustable wrench must be greater than the locking force of the threaded connection of the workpiece being tested.

[0021] Key Points: The device is an assembly assembly, which includes three bodies. The first body is the main body. The main body is a cavity structure with circular holes on the upper and lower parts and square holes on the side. The circular hole on the upper part of the main body is a threaded hole, which is connected to the square hole cavity on the side of the main body and is used to install the connecting rod. The circular hole on the lower part of the main body is connected to the square hole cavity on the side of the main body, which is used to load the workpiece to be measured. The size of the circular hole should be larger than the diameter of the disc screw cap of the workpiece to be measured. The second body is a connecting rod. The connecting rod is a cylindrical structure, the lower end is an external threaded cylindrical screw, the thread matches the threaded hole of the main body, and the upper end is a cylinder with an inner square countersunk hole, which matches the size of the outer square interface head of the digital torque wrench. The third body is a pressing plate, which is a rectangular parallelepiped structure with a slot in the middle. Its outer length and width should be smaller than the size of the square hole on the side of the main body 1, the height plus the thickness of the nut of the workpiece to be measured should be smaller than the height of the square hole of the main body 1, and the width of the middle square groove should be slightly larger than the cylindrical diameter of the screw of the workpiece to be measured. The assembly method of the device is to screw the external threaded end of the second body connecting rod into the threaded hole of the first body, and the third body pressing piece is inserted into the side square hole of the first body to play a connecting role when the device is connected to the workpiece to be measured.

[0022] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A locking force detection device for a disc screw, wherein the workpiece to be detected comprises a disc nut and a disc screw, a positioning disc is provided at the connecting end of the disc nut, the disc screw is threadedly connected to the disc nut, and the nut of the disc screw is in contact with the positioning disc of the disc nut for positioning, wherein: Including main body, connecting rod, pressing piece, The main body has an inner cavity with a side opening, a threaded hole is provided at one end of the main body, and a clearance hole is provided at the other end, the threaded hole and the clearance hole are coaxial and communicated with the inner cavity of the main body, and the clearance hole is used for installing a nut of a disc screw; The pressing piece is U-shaped and inserted into the inner cavity of the main body from the side opening. The pressing piece is used to clamp with the disc nut through the slot. In the clamping state, the two ends of the pressing piece are respectively in contact with the end surface of the inner cavity of the main body and the back of the positioning disc of the disc nut. One end of the connecting rod is a screw rod, and the screw rod end of the connecting rod cooperates with the threaded hole of the main body. The screw rod end of the connecting rod is used to apply pressure to the nut of the disc screw to axially compress the disc screw. In the compressed state, the clamping force of the connecting rod on the disc screw is greater than the threaded connection locking force of the workpiece to be measured. The other end of the connecting rod is a wrench twisting end, and the wrench twisting end is provided with a square countersunk hole, and the square countersunk hole is used to cooperate with the external square interface head of the digital torque wrench.

2. The locking force detection device for a disc screw according to claim 1, characterized in that: The outer contour of the pressing piece is in the shape of a rectangular parallelepiped, the inner cavity of the main body is a square hole, and the pressing piece and the inner cavity of the main body are gap-matched to form a positioning for the pressing piece.

3. The locking force detection device for a disc screw according to claim 1, characterized in that: A rubber gasket is arranged between the screw rod end of the connecting rod and the nut of the disc screw.

4. The locking force detection device for a disc screw according to claim 1, characterized in that: The outer peripheral surface of the twisting end of the wrench is a square, and the outer peripheral surface of the twisting end of the wrench is used to cooperate with the adjustable wrench.

5. A method for using the locking force detection device for a disc screw according to claim 1, characterized in that: Install the nut of the disc screw into the inner cavity of the main body through the circular hole; Insert the pressing piece into the inner cavity of the main body from the side opening, and the pressing piece is clamped with the disc nut through the slot, so that the two ends of the pressing piece are respectively in contact with the end surface of the inner cavity of the main body and the back of the positioning disc of the disc nut to be positioned; Use an adjustable wrench to twist the wrench end of the connecting rod, so that the screw end of the connecting rod applies pressure to the nut of the disc screw, axially compressing the disc screw. The pressing force of the connecting rod on the disc screw is greater than the threaded connection locking force of the workpiece being measured. Under the action of the pressing force, the connecting rod and the disc screw can rotate synchronously, while the disc nut, the pressing piece, and the main body remain stationary. During testing, insert the external square interface head of the digital torque wrench into the square countersunk hole of the connecting rod, adjust the force measuring direction of the torque wrench to be consistent with the direction in which the disc screw is screwed out, turn the torque wrench, and the force when the disc screw is screwed out is the locking force of the disc screw.

Images