Pre-valued torque wrench

Abstract

The utility model relates to a pre-value type torque wrench which comprises a handle body, a square tenon connector, a torque transmission structure, a torque adjusting spring and a tail end adjusting structure, a cavity is formed in the handle body, the square tenon connector is fixedly connected to one end of the handle body, and the torque transmission structure is arranged in the cavity of the handle body; the torsion adjusting spring is arranged in a cavity of the handle body and abuts against the torque transmission structure, the tail end adjusting structure is arranged at one end of the handle body to adjust the tension degree of the torsion adjusting spring, and the torque transmission structure comprises a torsion rod, a positioning pin, a force transmission rod and an abutting structure. On one hand, the torque wrench has a more accurate torque control effect, and on the other hand, the surface of the torque wrench is coated with the insulating layer, so that the torque wrench has a good insulating effect.

Description

Technical Field

[0001] The present application relates to the field of maintenance tools, and in particular to a preset torque wrench. Background Art

[0002] A torque wrench with a preset torque value, also known as a preset torque wrench or a fixed / preset torque wrench, is a hand tool specifically used to control the torque. The characteristic of this wrench is that a torque value can be preset. When the applied torque reaches this preset value, the wrench will make a "click" sound or the wrench connection will bend a little, accompanied by obvious hand vibration, to remind the user that it has been tightened to the preset torque value to avoid over-tightening or loosening. This wrench is widely used in the tightening assembly and maintenance of machinery, automobiles, aerospace, ships and other fields.

[0003] The working principle of the preset torque wrench is based on the mechanical principle of elastic deformation. Before use, the user needs to set the torque value by rotating the adjustment wheel and adjusting the locking handle according to the torque value to be adjusted. After the setting is completed, the user can apply force evenly in the clockwise direction. When a "click" sound is heard or the wrench feels a sense of force release, the set torque value has been reached. At this time, the force can be stopped to complete the tightening work.

[0004] For example, in the invention patent of Taiwan, China with patent number TW1832213B, a torque wrench with lubrication is disclosed, including a handle body, one side of the handle body is connected to a steel pipe, one side of the steel pipe is provided with a driving head, and also includes: a first slider body, a second slider body is provided in the first slider body, the second slider body is connected to a driving block, the driving block is connected to a collision block, the first slider body, the second slider body and the collision block are arranged in the steel pipe; and an oil groove, the oil groove is arranged on the outside of the first slider body, the oil groove is arranged by a plurality of evenly distributed around the first slider body, the oil groove is arranged on the axial surface of the first slider body, the oil groove can be circular, rectangular, polygonal and annular, and the number and distribution of the oil grooves are not limited.

[0005] The torque wrench in the above patent lubricates the internal components of the torque wrench by setting an oil groove structure, thereby reducing wear. Its working principle is to transmit the force of the drive head to the screw, and the drive head is driven by the transmission pin, and the drive head rotates axially around the transmission pin. When the force value reaches the force value set by the torsion spring, the torsion spring is compressed first, and then the drive block is reversed. After unloading, the torsion spring returns to its original position, and after returning to its original position, the drive block also returns to its original position.

[0006] This type of torque wrench uses a driving block to unload force. In actual use, the unloading method of the block reversal is prone to jamming and large delays. Therefore, the problem of over-tightening often occurs, and a torque wrench with more precise torque setting is needed. Utility Model Content

[0007] In order to improve the problem that the torque wrench commonly used currently uses a block to release force and thus the torque control is not precise enough, the present application provides a preset torque wrench.

[0008] The present application provides a preset torque wrench adopting the following technical solution:

[0009] A preset torque wrench, comprising a handle body, a square tenon connector, a torque transmission structure, a torque adjustment spring and a tail end adjustment structure, wherein a cavity is provided in the handle body, the square tenon connector is fixedly connected to one end of the handle body, the torque transmission structure is arranged in the cavity of the handle body and is located at an end close to the square tenon connector, the torque adjustment spring is arranged in the cavity of the handle body and is located at an end away from the square tenon connector, the torque adjustment spring is tightly pressed against the torque transmission structure, and the tail end adjustment structure is arranged at the The end of the handle body away from the square tenon connector is used to adjust the tension of the torsion adjustment spring. The torque transmission structure includes a torsion bar, a positioning pin, a force transmission rod and a tightening structure. One end of the torsion bar is fixedly connected to the square tenon connector, the positioning pin passes through the torsion bar and is fixedly connected to the cavity of the handle body, one end of the force transmission rod is rotatably connected to the end of the torsion bar away from the square tenon connector, and the other end of the force transmission rod is rotatably connected to the tightening structure, and the tightening structure is tightly matched with the torsion adjustment spring.

[0010] Optionally, the clamping structure includes a push block, a sliding rod and a sliding block, the push block is rotatably connected to one end of the force transmission rod away from the torsion rod, the push block slides in the cavity of the handle body, the sliding rod is fixedly connected to one end of the push block away from the force transmission rod, a sliding groove is provided in the sliding block, the sliding rod is inserted in the sliding groove and slidably cooperates with the sliding groove, and one end of the sliding block away from the push block is clamped against the torsion adjustment spring and partially inserted into the torsion adjustment spring.

[0011] Optionally, a groove is formed on a side wall of the push block, a roller is provided in the groove, and the roller rolls with an inner wall of the cavity of the handle body.

[0012] Optionally, a limiting bolt is provided on the handle body, and the limiting bolt penetrates the side wall of the handle body and extends into the cavity, and the limiting bolt limits the displacement of the torsion bar.

[0013] Optionally, the tail end adjustment structure includes a clamping member and an adjusting member, the clamping member includes a clamping plate and a clamping rod, the clamping plate is located in the cavity of the handle body and is tightly fitted with the end of the torsion adjustment spring facing away from the square tenon connector, one end of the clamping rod is pressed against the clamping plate, and the other end of the clamping plate is connected to the adjusting member, and the adjusting member is arranged at the end of the handle body facing away from the square tenon connector.

[0014] Optionally, the clamping member further includes a connecting ball, and an end of the clamping plate close to the clamping rod and an end of the clamping rod close to the clamping plate are both provided with a receiving groove, and the connecting ball is arranged in the receiving groove.

[0015] Optionally, the adjusting member includes an adjusting nut, an adjusting screw, and a limiting ring. The adjusting nut is fixedly connected to the cavity of the handle body, the adjusting screw is passed through the adjusting nut and threadedly connected to the adjusting nut, a threaded hole is provided in the adjusting screw, the clamping rod is threadedly connected to the threaded hole, the limiting ring is fixedly connected to the cavity of the handle body, and the adjusting screw is rotatably passed through the limiting ring.

[0016] Optionally, the adjusting member also includes a rotating end cover and a guide ring, the rotating end cover is made of insulating material, the rotating end cover is rotatably sleeved on the end of the handle body away from the square tenon connector, the bottom wall of the rotating end cover is provided with a sleeve, the end of the adjusting screw away from the square tenon connector is slidably inserted into the sleeve and snap-fitted with the sleeve, the guide ring is fixedly sleeved on the end of the handle body away from the square tenon connector and is located in the rotating end cover, a plurality of guide grooves are opened on the peripheral wall of the guide ring, the plurality of guide grooves are arranged at intervals along the circumference of the guide ring and each of the guide grooves extends along the axial direction of the guide ring, the inner side wall of the rotating end cover is provided with a plurality of guide columns, the guide columns are slidably fitted with the guide grooves.

[0017] Optionally, a reset member is further provided in the rotating end cover, and the reset member includes a retaining ring and a reset spring. The retaining ring is slidably sleeved on the end of the handle body away from the square tenon connector and fixedly connected to the inner wall of the rotating end cover. The reset spring is sleeved on the end of the handle body away from the square tenon connector. One end of the reset spring is tightly pressed against the retaining ring, and the other end of the reset spring is tightly pressed against the guide ring.

[0018] Optionally, the handle body is covered with an insulating layer.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] In the present application, the torsion bar and the torsion adjustment spring are connected by a connecting rod structure and a tightening structure. After the tension of the torsion adjustment spring is adjusted by the tail end adjustment structure, the torsion adjustment spring applies a fixed driving force to the torsion bar through the tightening structure and the connecting rod structure. Once the force of the torsion bar exceeds the driving force provided by the torsion adjustment spring during use, the torsion bar can directly push the torsion adjustment spring through the force transmission rod. Compared with the current conventional unloading method of unloading the force by driving the block to flip, the present application transmits and unloads the force through the connecting rod structure, and the torque control is more precise.

[0021] The special clamping structure ensures that the clamping structure pushes the torque adjustment spring to deform more stably when subjected to force through the cooperation of the sliding rod and the sliding block, thereby further improving the accuracy of torque control;

[0022] By arranging a roller structure on the push block and arranging a limit bolt on the handle body that can limit the maximum displacement of the torsion bar, on the one hand, the high movement stability of the push block can be ensured, and on the other hand, the accuracy of the torsion bar pushing the force transmission rod can be improved, thereby further improving the accuracy of torque control;

[0023] The tail end adjustment structure is coordinated by the adjustment part and the clamping part. The clamping part connects the clamping stem and the clamping plate through a special connecting ball, which greatly reduces the possibility of jamming between the two during the adjustment process, thereby further improving the accuracy of torque control.

[0024] The adjusting member engages with the guide column in the rotating end cover and the guide groove on the guide ring to limit the rotation of the rotating end cover. Correspondingly, the adjusting screw connected to the rotating end cover is also limited, and the states of the natural adjusting screw and the torque adjusting spring are also fixed, so that the set torque of the torque wrench is fixed; and when the torque value of the torque wrench needs to be adjusted, it is only necessary to push the rotating end cover to overcome the elastic force of the reset spring so that the guide column can be disengaged from the guide groove. At this time, the rotating end cover connected to the adjusting screw can be freely used, and the adjusting screw adjusts the tensioning state of the torque adjusting spring through the fastening member to set and adjust the torque of the torque wrench. After the adjustment is completed, the force on the rotating end cover is removed, and the guide ring and the guide groove of the rotating end cover re-engage with each other under the elastic force of the reset spring, thereby fixing the set torque.

[0025] Both the insulating layer covering the handle body and the exposed rotating end cover in the adjusting member are made of insulating material, so that the entire exposed part of the torque wrench is insulated, thereby enabling the torque wrench of the present application to have good insulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the torque wrench according to the embodiment of the present application.

[0027] Figure 2 It is a cross-sectional view of the overall structure of the torque wrench according to the embodiment of the present application.

[0028] Figure 3 It is a cross-sectional view of the structure inside the torque wrench handle body of the embodiment of the present application.

[0029] Figure 4 It is a schematic diagram of the overall structure of the torque wrench handle body of the embodiment of the present application.

[0030] Figure 5 It is a structural schematic diagram of one end of the torque wrench handle body of the embodiment of the present application.

[0031] Figure 6 It is a cross-sectional view of a rotating end cover in a torque wrench according to an embodiment of the present application.

[0032] Explanation of reference numerals: 1. handle body; 11. cavity; 12. insulation layer; 13. limit bolt; 2. square tenon connector; 3. torque transmission structure; 31. torque bar; 32. positioning pin; 33. force transmission rod; 34. tightening structure; 341. push block; 342. slide rod; 343. slide block; 344. groove; 345. roller; 346. slide groove; 4. torque adjustment spring; 5. tail end adjustment Structure; 51, fastening member; 511, fastening plate; 512, fastening rod; 513, accommodating groove; 514, connecting ball; 52, adjusting member; 521, adjusting nut; 522, adjusting screw; 523, threaded hole; 524, limiting ring; 525, rotating end cover; 526, guide column; 527, guide ring; 528, guide groove; 529, sleeve; 6, reset member; 61, retaining ring; 62, reset spring. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-6 This application is described in further detail.

[0034] The embodiment of the present application discloses a pre-valued torque wrench, including a handle body 1, a square tenon connector 2, a torque transmission structure 3, a torque adjustment spring 4 and a tail end adjustment structure 5, a cavity 11 is provided in the handle body 1, and an insulating layer 12 is covered on the handle body 1.

[0035] The square tenon connector 2 is fixedly connected to one end of the handle body 1. The torque transmission structure 3 is arranged in the cavity 11 of the handle body 1 and is located at one end close to the square tenon connector 2. The torsion adjustment spring 4 is arranged in the cavity 11 of the handle body 1 and is located at one end away from the square tenon connector 2. The torsion adjustment spring 4 is tightly pressed against the torque transmission structure 3. The tail end adjustment structure 5 is arranged at one end of the handle body 1 away from the square tenon connector 2 to adjust the tension of the torsion adjustment spring 4.

[0036] The torque transmission structure 3 includes a torsion rod 31, a positioning pin 32, a force transmission rod 33 and a tightening structure 34. One end of the torsion rod 31 is fixedly connected to the square tenon connector 2, the positioning pin 32 passes through the torsion rod 31 and is fixedly connected to the cavity 11 of the handle body 1, one end of the force transmission rod 33 is rotatably connected to the end of the torsion rod 31 away from the square tenon connector 2, and the other end of the force transmission rod 33 is rotatably connected to the tightening structure 34, and the tightening structure 34 is tightly matched with the torque adjustment spring 4.

[0037] The pressing structure 34 includes a push block 341, a slide rod 342 and a slider 343. The push block 341 is rotatably connected to the end of the force transmission rod 33 away from the torsion rod 31. The push block 341 slides in the cavity 11 of the handle body 1. A groove 344 is provided on the side wall of the push block 341. A roller 345 is provided in the groove 344. The roller 345 rolls with the inner wall of the cavity 11 of the handle body 1. The slide rod 342 is fixedly connected to the end of the push block 341 away from the force transmission rod 33. A slide groove 346 is provided in the slider 343. The slide rod 342 is inserted in the slide groove 346 and slides with the slide groove 346. The end of the slider 343 away from the push block 341 is pressed against the torsion adjustment spring 4 and partially inserted into the torsion adjustment spring 4.

[0038] A limiting bolt 13 is provided on the handle body 1 . The limiting bolt 13 penetrates the side wall of the handle body 1 and extends into the cavity 11 . The limiting bolt 13 limits the displacement of the torsion bar 31 .

[0039] The tail end adjustment structure 5 includes a clamping member 51 and an adjusting member 52. The clamping member 51 includes a clamping plate 511, a clamping rod 512 and a connecting ball 514. The clamping plate 511 is located in the cavity 11 of the handle body 1 and is tightly matched with the end of the torsion adjustment spring 4 that is away from the square tenon connector 2. One end of the clamping rod 512 is clamped against the clamping plate 511, and the other end of the clamping plate 511 is connected to the adjusting member 52. An end of the clamping plate 511 close to the clamping rod 512 and an end of the clamping rod 512 close to the clamping plate 511 are both provided with a receiving groove 513, and the connecting ball 514 is arranged in the receiving groove 513.

[0040] The adjusting member 52 is arranged at the end of the handle body 1 away from the square tenon connector 2, and the adjusting member 52 includes an adjusting nut 521, an adjusting screw 522, a limiting ring 524, a rotating end cover 525 and a guide ring 527. The adjusting nut 521 is fixedly connected to the cavity 11 of the handle body 1, the adjusting screw 522 is penetrated in the adjusting nut 521 and is threadedly connected with the adjusting nut 521, a threaded hole 523 is provided in the adjusting screw 522, and the abutting rod 512 is threadedly connected in the threaded hole 523. By twisting the abutting rod 512, the preset torque value can be fine-tuned. The limiting ring 524 is fixedly connected to the cavity 11 of the handle body 1, and the adjusting screw 522 is rotatably penetrated in the limiting ring 524.

[0041] The rotating end cover 525 is rotatably sleeved on the end of the handle body 1 away from the square tenon connector 2. The end of the rotating end cover 525 is threadedly connected with a blocking nut. By simply unscrewing the blocking nut, the tightening rod 512 located inside can be screwed for fine adjustment. The bottom wall of the rotating end cover 525 is provided with a sleeve 529. The end of the adjusting screw 522 away from the square tenon connector 2 is slidably inserted into the sleeve 529 and engaged with the sleeve 529. The guide ring 527 is fixedly sleeved on the end of the handle body 1 away from the square tenon connector 2 and located in the rotating end cover 525. A plurality of guide grooves 528 are provided on the peripheral wall of the guide ring 527. The plurality of guide grooves 528 are arranged at intervals along the circumference of the guide ring 527 and each guide groove 528 extends along the axial direction of the guide ring 527. The inner side wall of the rotating end cover 525 is provided with a plurality of guide posts 526. The guide posts 526 are slidably engaged with the guide grooves 528.

[0042] A reset member 6 is also provided in the rotating end cover 525, and the reset member 6 includes a retaining ring 61 and a reset spring 62. The retaining ring 61 is slidably sleeved on the end of the handle body 1 away from the square tenon connector 2 and is fixedly connected to the inner wall of the rotating end cover 525. The reset spring 62 is sleeved on the end of the handle body 1 away from the square tenon connector 2. One end of the reset spring 62 is tightly pressed against the retaining ring 61, and the other end of the reset spring 62 is tightly pressed against the guide ring 527.

[0043] 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. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A preset torque wrench, characterized in that: The handle comprises a handle body (1), a square tenon connector (2), a torque transmission structure (3), a torsion adjustment spring (4) and a tail end adjustment structure (5), wherein a cavity (11) is provided in the handle body (1), the square tenon connector (2) is fixedly connected to one end of the handle body (1), the torque transmission structure (3) is arranged in the cavity (11) of the handle body (1) and is located at an end close to the square tenon connector (2), the torsion adjustment spring (4) is arranged in the cavity (11) of the handle body (1) and is located at an end away from the square tenon connector (2), the torsion adjustment spring (4) is tightly pressed against the torque transmission structure (3), and the tail end adjustment structure (5) is arranged at an end of the handle body (1) away from the square tenon connector. One end of the connecting head (2) is used to adjust the tension of the torsion adjustment spring (4). The torque transmission structure (3) comprises a torsion rod (31), a positioning pin (32), a force transmission rod (33) and a tightening structure (34). One end of the torsion rod (31) is fixedly connected to the square tenon connecting head (2). The positioning pin (32) passes through the torsion rod (31) and is fixedly connected to the cavity (11) of the handle body (1). One end of the force transmission rod (33) is rotatably connected to an end of the torsion rod (31) that is away from the square tenon connecting head (2). The other end of the force transmission rod (33) is rotatably connected to the tightening structure (34). The tightening structure (34) is tightly matched with the torsion adjustment spring (4).

2. A preset torque wrench according to claim 1, characterized in that: The pressing structure (34) comprises a push block (341), a slide rod (342) and a slider (343); the push block (341) is rotatably connected to one end of the force transmission rod (33) away from the torsion rod (31); the push block (341) slides in the cavity (11) of the handle body (1); the slide rod (342) is fixedly connected to one end of the push block (341) away from the force transmission rod (33); a slide groove (346) is provided in the slider (343); the slide rod (342) is inserted into the slide groove (346) and slidably cooperates with the slide groove (346); one end of the slider (343) away from the push block (341) is pressed against the torsion adjustment spring (4) and partially inserted into the torsion adjustment spring (4).

3. A preset torque wrench according to claim 2, characterized in that: A groove (344) is formed on the side wall of the push block (341), a roller (345) is arranged in the groove (344), and the roller (345) rolls with the inner wall of the cavity (11) of the handle body (1).

4. A preset torque wrench according to claim 2, characterized in that: A limiting bolt (13) is provided on the handle body (1), and the limiting bolt (13) penetrates the side wall of the handle body (1) and extends into the cavity (11), and the limiting bolt (13) limits the displacement of the torsion bar (31).

5. The preset torque wrench according to claim 1, characterized in that: The tail end adjustment structure (5) comprises a clamping member (51) and an adjustment member (52), wherein the clamping member (51) comprises a clamping plate (511) and a clamping rod (512), wherein the clamping plate (511) is located in the cavity (11) of the handle body (1) and is tightly matched with an end of the torsion adjustment spring (4) facing away from the square tenon connector (2), one end of the clamping rod (512) is tightly pressed against the clamping plate (511), and the other end of the clamping plate (511) is connected to the adjustment member (52), and the adjustment member (52) is arranged at an end of the handle body (1) facing away from the square tenon connector (2).

6. A preset torque wrench according to claim 5, characterized in that: The retaining member (51) further comprises a connecting ball (514); an end of the retaining plate (511) close to the retaining rod (512) and an end of the retaining rod (512) close to the retaining plate (511) are both provided with a receiving groove (513); and the connecting ball (514) is arranged in the receiving groove (513).

7. The preset torque wrench according to claim 5, characterized in that: The adjusting member (52) comprises an adjusting nut (521), an adjusting screw (522), and a limiting ring (524); the adjusting nut (521) is fixedly connected to the cavity (11) of the handle body (1); the adjusting screw (522) is passed through the adjusting nut (521) and is threadedly connected to the adjusting nut (521); a threaded hole (523) is provided in the adjusting screw (522); the clamping rod (512) is threadedly connected to the threaded hole (523); the limiting ring (524) is fixedly connected to the cavity (11) of the handle body (1); and the adjusting screw (522) is rotatably passed through the limiting ring (524).

8. The preset torque wrench according to claim 7, characterized in that: The adjusting member (52) further comprises a rotating end cover (525) and a guide ring (527), wherein the rotating end cover (525) is made of an insulating material and is rotatably sleeved on an end of the handle body (1) away from the square tenon connector (2), a sleeve (529) is provided on the bottom wall of the rotating end cover (525), an end of the adjusting screw rod (522) away from the square tenon connector (2) is slidably inserted into the sleeve (529) and is engaged with the sleeve (529), and the guide ring (527) is provided with a plurality of sleeves (529) and a plurality of sleeves (529) are provided on the bottom wall of the rotating end cover (525). 7) A fixed sleeve is arranged on one end of the handle body (1) away from the square tenon connector (2) and is located in the rotating end cover (525), and a plurality of guide grooves (528) are provided on the peripheral wall of the guide ring (527), and the plurality of guide grooves (528) are arranged at intervals along the circumference of the guide ring (527) and each guide groove (528) extends along the axial direction of the guide ring (527), and a plurality of guide columns (526) are provided on the inner side wall of the rotating end cover (525), and the guide columns (526) are slidably matched with the guide grooves (528).

9. A preset torque wrench according to claim 8, characterized in that: A reset member (6) is further provided in the rotating end cover (525), and the reset member (6) comprises a retaining ring (61) and a reset spring (62). The retaining ring (61) is slidably sleeved on an end of the handle body (1) away from the square tenon connector (2) and fixedly connected to the inner wall of the rotating end cover (525). The reset spring (62) is sleeved on an end of the handle body (1) away from the square tenon connector (2). One end of the reset spring (62) is tightly pressed against the retaining ring (61), and the other end of the reset spring (62) is tightly pressed against the guide ring (527).

10. The preset torque wrench according to claim 1, characterized in that: The handle body (1) is covered with an insulating layer (12).

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