Explosion-proof preset torque wrench

Abstract

The application discloses an explosion-proof preset type torque wrench and relates to the technical field of torque wrenches, which comprises a shaft sleeve and a wrench mechanism arranged on the shaft sleeve; a torque preset mechanism for presetting torque is arranged on the shaft sleeve; and a protection mechanism for unloading force protection when the wrench mechanism is subjected to excessive force is arranged on the wrench mechanism. The preset type torque wrench is provided with the torque preset mechanism, which replaces the existing preset type torque structure, and the first warning mechanism is pushed to give a warning by means of extruding the oil storage tank, thus replacing the existing warning structure which gives a warning by means of collision and vibration sound generation. The preset type torque wrench can reduce metal collision and abrasion, reduce spark generation and be beneficial to use in a flammable and explosive environment. When a user ignores the warning prompt of the first warning mechanism, the wrench mechanism is subjected to greater force, the oil storage tank is extruded by greater force, the protection mechanism is started at this time, the wrench mechanism is unloaded, the preset type torque wrench is protected, and damage caused by excessive force is prevented.

Description

Technical Field

[0001] This invention relates to the field of torque wrench technology, specifically to an explosion-proof preset torque wrench. Background Technology

[0002] In flammable and explosive environments such as gas stations, gas stations, and paint warehouses, spark control is extremely strict. However, the use of mechanical equipment is unavoidable, and regular maintenance and repair are necessary. For some delicate mechanical equipment, preset torque wrenches are often required. Improper use of these wrenches can generate sparks, leading to irreparable damage. Especially in flammable and explosive environments, even slight vibrations can cause explosions. Removing the equipment from the flammable and explosive environment for repair is extremely inconvenient; or strictly following operating procedures to avoid sparks from improper wrench use, but even momentary operator negligence can lead to unpredictable consequences. Therefore, explosion-proof wrenches for flammable environments are particularly important.

[0003] Existing preset torque wrenches produce a sound and vibration when the applied torque reaches the set value, resulting in significant metal-to-metal friction. Frequent use can also cause metal wear and even sparks. Therefore, this application provides an explosion-proof preset torque wrench to meet this requirement. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide an explosion-proof preset torque wrench that replaces the existing sound and vibration warning structure when the applied torque reaches the set value, reduces metal friction, and is convenient for use in flammable and explosive environments.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] An explosion-proof preset torque wrench includes a bushing and a wrench mechanism disposed on the bushing; the bushing is provided with a torque preset mechanism for preset torque, and the wrench mechanism is provided with a protection mechanism for unloading force when the wrench mechanism is subjected to excessive force.

[0007] The torque preset mechanism includes a tensioning mechanism. The output end of the tensioning mechanism is connected to a first connecting shaft. A pair of oil reservoirs are provided inside the bushing. The oil reservoirs are filled with hydraulic oil. The first connecting shaft is inserted into the oil reservoir. A first alarm mechanism is provided on the first connecting shaft corresponding to the oil reservoir. A squeezing mechanism is provided on the wrench mechanism. When the torque reaches the preset value, it is used to squeeze the oil reservoir to push the first alarm mechanism to issue an alarm.

[0008] As a further aspect of the present invention: the wrench mechanism includes a drive rod and a drive block disposed at the end of the drive rod, the bushing is sleeved on the drive rod, a pin is disposed between the bushing and the drive rod, and the drive rod is rotatably connected to the bushing through the pin.

[0009] As a further aspect of the present invention, it also includes a reversing mechanism for changing the driving direction of the torque wrench. The reversing mechanism includes a ratchet disposed on the drive block, a bidirectional pawl rotatably connected inside the drive rod, and a limiting mechanism for keeping one side of the bidirectional pawl engaged with the ratchet inside the drive rod.

[0010] The limiting mechanism includes a first spring disposed in the drive rod, a first top ball disposed at the end of the first spring, a pair of grooves disposed on the bidirectional pawl, the first top ball abutting against one of the grooves, and a reversing push rod disposed on the bidirectional pawl for driving the bidirectional pawl to rotate.

[0011] When one side of the bidirectional pawl engages with the ratchet, the drive rod drives the drive block on the ratchet to rotate clockwise; when the other side of the bidirectional pawl engages with the ratchet, the drive rod drives the drive block on the ratchet to rotate counterclockwise.

[0012] As a further aspect of the present invention: the oil tank includes a corrugated telescopic sleeve and a baffle disposed on one side of the corrugated telescopic sleeve. By squeezing the baffle, the corrugated telescopic sleeve is compressed, thereby increasing the hydraulic oil pressure and squeezing the first alarm mechanism to issue an alarm.

[0013] As a further aspect of the present invention: the first warning mechanism includes a first sliding sleeve disposed on a first connecting shaft, a first rotating rod rotatably connected to the first sliding sleeve, a first connecting pipe disposed on the oil tank, a first piston slidably connected inside the first connecting pipe, a push plate disposed at the top end of the first piston, a second connecting shaft disposed at the bottom end of the first piston, a connecting plate disposed at the end of the second connecting shaft, the first rotating rod rotatably connected to the connecting plate, and a third spring sleeved on the second connecting shaft.

[0014] As a further aspect of the present invention: the bushing is provided with a second warning mechanism for issuing a warning when the torque reaches a preset value. The second warning mechanism includes a mounting block provided on the bushing, a cavity being provided in the mounting block, a push plate being slidably connected in the cavity, an airflow pipe being provided on the mounting block, and the cavity being connected to the outside through the airflow pipe. A reed is provided in the airflow pipe for vibrating and producing sound when airflow passes through it.

[0015] As a further aspect of the present invention: the mounting block is provided with a third warning mechanism for issuing an alarm when the torque reaches a preset value. The third warning mechanism includes a flip cover rotatably connected to the mounting block for blocking the top of the airflow pipe. The flip cover is provided with a fifth spring for driving the flip cover to rotate and reset. The flip cover is provided with a gear. A rack is slidably connected inside the mounting block, and the gear meshes with the rack. A warning plate is provided on the rack, and the warning plate is slidably connected to the mounting block.

[0016] As a further aspect of the present invention: the extrusion mechanism includes a second connecting rod connected to the drive rod, a second sliding sleeve is slidably connected between a pair of oil storage tanks in the bushing, a slider is provided on the second connecting rod, a sliding groove is provided on the second sliding sleeve, and the slider is slidably connected to the sliding groove.

[0017] As a further embodiment of the present invention: the protection mechanism includes a one-way valve disposed on the first connecting shaft, the one-way valve being disposed on the outside of the oil tank, a second connecting pipe being disposed inside the bushing, the one-way valve being disposed inside the second connecting pipe, a thrust mechanism being disposed on the second connecting pipe for pushing the bidirectional pawl to rotate and separate from the ratchet, the one-way valve including a plug shaft slidably connected to the first connecting shaft, a second top ball being disposed at one end of the plug shaft, a fourth spring being sleeved on the plug shaft, a through hole being opened on one side of the oil tank, a sealing ring being disposed on the through hole, the sealing ring abutting against the second top ball, and the second connecting pipe communicating with the inside of the oil tank through the through hole;

[0018] The thrust mechanism includes a second piston slidably connected to a second connecting pipe. A guide shaft is provided on the second piston and slidably connected to the second connecting pipe. A second rotating rod is rotatably connected to the guide shaft. A push block is provided at the end of the second rotating rod. The push block has a semi-ring structure. A pair of stop bars are provided on the bidirectional pawl. When one side of the bidirectional pawl engages with the ratchet, the stop bar away from its engagement position abuts against the push block, and the other stop bar moves away from the push block.

[0019] As a further aspect of the present invention: the tensioning mechanism is fitted with an adjusting sleeve on the bushing, the adjusting sleeve is provided with a screw, and the bushing is fitted on the screw, the bushing is provided with a threaded sleeve, the threaded sleeve is threaded on the screw, a second spring is fitted on the upper part of the screw, a first connecting rod is provided at the end of the screw, one end of the second spring is connected to the first connecting rod, one end of the second spring is connected to the bushing, and the end of the first connecting rod is connected to the first connecting shaft.

[0020] The beneficial effects of this invention are:

[0021] 1. By setting a torque preset mechanism to replace the existing preset torque structure, the first alarm mechanism is pushed to sound by squeezing the oil tank, which replaces the existing alarm structure that sounds by collision and vibration. This can reduce metal collision and wear, reduce spark generation, and is more suitable for use in flammable and explosive environments.

[0022] When the user ignores the warning prompt of the first warning mechanism, as the force on the wrench mechanism increases, the oil tank is subjected to greater pressure. At this time, the protection mechanism is activated, which releases the force on the wrench mechanism, thereby protecting the preset torque wrench and preventing damage from excessive force.

[0023] 2. By setting up a second warning mechanism, based on the first warning mechanism, the push plate is pushed to squeeze the air in the cavity by squeezing the oil tank, so that the airflow is discharged through the airflow pipe, and the reed in the airflow pipe vibrates to produce sound, thereby improving the warning effect.

[0024] 3. By setting up a third warning mechanism, during the process of airflow causing the reed to vibrate and produce sound, the flip cover partially obstructs the airflow pipe, narrowing the airflow space and increasing the airflow velocity, thereby increasing the frequency of reed vibration and the volume of the vibration, thus improving the warning effect. At the same time, as the flip cover rotates, it pushes the warning plate and the mounting block to be misaligned and exposed, making it easier for users to observe and further improving the warning effect. Attached Figure Description

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 This is a first-view three-dimensional structural diagram of the entire invention;

[0027] Figure 2 This is a schematic diagram of the overall second-view three-dimensional structure of the present invention;

[0028] Figure 3 This is a three-dimensional enlarged schematic diagram of part of the structure of the present invention after the bushing is removed;

[0029] Figure 4 This is a partially cross-sectional, three-dimensional enlarged schematic diagram of a portion of the structure of this invention;

[0030] Figure 5 This is a partially cross-sectional, enlarged three-dimensional structural diagram of the drive rod of the present invention;

[0031] Figure 6 This is a partially cross-sectional, enlarged three-dimensional structural diagram of the first warning mechanism of the present invention;

[0032] Figure 7 This is a partially cross-sectional, enlarged three-dimensional structural diagram of the first, second, and third warning mechanisms of the present invention;

[0033] Figure 8 This is the present invention. Figure 7 Enlarged structural diagram of region A in the middle;

[0034] Figure 9 This is a three-dimensional enlarged schematic diagram of part of the structure of the present invention after removing the bushing and drive rod;

[0035] Figure 10 This is the present invention. Figure 9 Enlarged structural diagram of region B in the middle;

[0036] Figure 11 This is the present invention. Figure 9 Enlarged structural diagram of region C in the middle;

[0037] Figure 12 This is a partially cross-sectional, three-dimensional enlarged structural diagram of the stretching mechanism of the present invention.

[0038] In the diagram: 1. Bushing; 2. Wrench mechanism; 21. Drive rod; 22. Drive block; 23. Pin; 3. Reversing mechanism; 31. Ratchet; 32. Bidirectional pawl; 33. First spring; 34. First ball bearing; 35. Groove; 36. Reversing push rod; 4. Torque preset mechanism; 41. Tensioning mechanism; 411. Adjusting sleeve; 412. Screw; 413. Screw sleeve; 414. Second spring; 415. First connecting rod; 42. First connecting shaft; 43. Oil reservoir; 431. Corrugated telescopic sleeve; 432. Baffle; 44. First warning mechanism; 441. First sliding sleeve; 442. First rotating rod; 443. First connecting pipe; 444. First piston; 445. Push plate; 44 6. Second connecting shaft; 447. Connecting plate; 448. Third spring; 45. Second warning mechanism; 451. Mounting block; 452. Airflow pipe; 453. Spring; 46. Third warning mechanism; 461. Flip cover; 462. Gear; 463. Rack; 464. Warning plate; 47. Pressing mechanism; 471. Second connecting rod; 472. Second sliding sleeve; 473. Sliding block; 474. Slide groove; 5. Protection mechanism; 51. One-way valve; 511. Insert shaft; 512. Second top ball; 513. Fourth spring; 514. Sealing ring; 52. Second connecting pipe; 53. Thrust mechanism; 531. Second piston; 532. Second rotating rod; 533. Stop lever; 534. Push block. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1: As Figure 1-12 As shown, the explosion-proof preset torque wrench includes a bushing 1 and a wrench mechanism 2 disposed on the bushing 1; the bushing 1 is provided with a torque preset mechanism 4 for preset torque, and the wrench mechanism 2 is provided with a protection mechanism 5 for unloading force protection when the wrench mechanism 2 is subjected to excessive force.

[0041] like Figure 3 As shown, the torque preset mechanism 4 (such as...) Figure 1 (As shown) includes a tensioning mechanism 41 (e.g.) Figure 2 As shown), the output end of the tensioning mechanism 41 is connected to a first connecting shaft 42 (as shown). Figure 6 As shown), a pair of oil reservoirs 43 are provided inside the bushing 1. The oil reservoirs 43 are filled with hydraulic oil. The first connecting shaft 42 is inserted into the oil reservoir 43. A first alarm mechanism 44 is provided on the first connecting shaft 42 corresponding to the oil reservoir 43 (as shown). Figure 4 As shown), wrench mechanism 2 (as shown) Figure 2 The oil tank 43 is provided with a squeezing mechanism 47. When the torque reaches the preset value, it is used to squeeze the oil tank 43 to push the first alarm mechanism 44 to issue an alarm.

[0042] It is worth noting that during use, the torque is first preset by the tensioning mechanism 41, and the bolt is tightened by the wrench mechanism 2. When the force applied to the wrench mechanism 2 reaches the preset torque, the reverse force on the wrench mechanism 2 is transmitted to the pressing mechanism 47. The pressing mechanism 47 presses the oil tank 43, causing the hydraulic oil pressure inside the oil tank 43 to rise. The hydraulic oil pushes the first alarm mechanism 44 to activate the alarm. The structure that activates the first alarm mechanism 44 by pressing the oil tank 43 when the preset torque is reached during use replaces the existing alarm structure that generates sound through collision vibration. This can reduce metal collision wear, reduce spark generation, and is beneficial for use in flammable and explosive environments.

[0043] As the user continues to tighten the bolt, even if the user does not observe the warning prompt from the first warning mechanism 44, the force on the wrench mechanism 2 increases, causing the oil tank 43 to be subjected to greater pressure. At this time, the protection mechanism 5 is activated, and the wrench mechanism 2 releases the force, thus protecting the preset torque wrench and preventing damage from excessive force.

[0044] like Figure 3 As shown, the wrench mechanism 2 (as shown) Figure 2 As shown, the device includes a drive rod 21 and a drive block 22 disposed at the end of the drive rod 21. The drive block 22 is used to install a hexagonal sleeve that drives the hexagonal bolt to rotate. Both the hexagonal bolt and the hexagonal sleeve are existing technologies and are not shown in the figure. The bushing 1 is sleeved on the drive rod 21. A pin 23 is disposed between the bushing 1 and the drive rod 21. The drive rod 21 is rotatably connected to the bushing 1 through the pin 23.

[0045] like Figure 4-5 As shown, it also includes a reversing mechanism 3 (such as...) for changing the driving direction of the torque wrench. Figure 2 As shown), the reversing mechanism 3 includes components disposed on the drive block 22 (as shown). Figure 3 The ratchet 31 on the drive lever 21 (as shown) Figure 3 The drive rod 21 is provided with a limiting mechanism inside the drive rod 21 to keep one side of the double-sided ratchet 32 ​​engaged with the ratchet 31.

[0046] The limiting mechanism includes a first spring 33 disposed within the drive rod 21, a first top ball 34 disposed at the end of the first spring 33, a pair of grooves 35 disposed on the bidirectional pawl 32, the first top ball 34 abutting against one of the grooves 35, and a reversing push rod 36 disposed on the bidirectional pawl 32 for driving the bidirectional pawl 32 to rotate; when one side of the bidirectional pawl 32 is engaged with the ratchet 31, the drive rod 21 drives the drive block 22 on the ratchet 31 to rotate clockwise; when the other side of the bidirectional pawl 32 is engaged with the ratchet 31, the drive rod 21 drives the drive block 22 on the ratchet 31 to rotate counterclockwise.

[0047] It is worth noting that during the reversing process, the reversing push rod 36 is pushed to drive the bidirectional pawl 32 to rotate, so that one side of the bidirectional pawl 32 separates from the ratchet 31, and the other side of the bidirectional pawl 32 engages with the ratchet 31. During this process, the first top ball 34 moves from one groove 35 to another groove 35. The first spring 33 pushes the first top ball 34, so that the bidirectional pawl 32 remains engaged with the ratchet 31, thereby realizing the reversing and facilitating the drive block 22 to rotate in the opposite direction.

[0048] like Figure 12 As shown, the tensioning mechanism 41 (as shown) Figure 2 As shown) sleeved on bushing 1 (as shown) Figure 2 The adjusting sleeve 411 (shown) has a screw 412 inside, and a bushing 1 is sleeved on the screw 412. A threaded sleeve 413 is provided inside the bushing 1 and threaded on the screw 412. A second spring 414 is sleeved on the upper part of the screw 412. A first connecting rod 415 is provided at the end of the screw 412. One end of the second spring 414 is connected to the first connecting rod 415 and the bushing 1. The end of the first connecting rod 415 is connected to the first connecting shaft 42.

[0049] It is worth noting that when setting the preset torque, rotating the adjusting sleeve 411 drives the screw 412 to rotate. With the cooperation of the screw sleeve 413, this drives the first connecting rod 415 to move, causing the second spring 414 to be compressed. The movement of the first connecting rod 415 drives the first connecting shaft 42 to move, causing the first warning mechanism 44 (such as...) Figure 4 (as shown) and protection mechanism 5 (such as Figure 9 (As shown) When started, the preset torque is achieved. At the same time, when the preset torque is set, the second spring 414 is compressed, making the connection between the screw 412 and the screw sleeve 413 tighter, which has the effect of preventing loosening, improving the stability when the preset torque is set, and preventing the preset torque from changing during use. By rotating the screw 412, the adjusting sleeve 411 on the screw 412 moves away from the bushing 1, so the handle of the entire wrench will become longer, making it easier to use.

[0050] like Figure 6 As shown, oil tank 43 (e.g.) Figure 3 (As shown) includes a corrugated telescopic sleeve 431 and a baffle 432 disposed on one side of the corrugated telescopic sleeve 431. By pressing the baffle 432, the corrugated telescopic sleeve 431 is compressed, thereby increasing the hydraulic oil pressure and pressing the first warning mechanism 44 (as shown). Figure 4 (As shown) Warning.

[0051] It is worth noting that the corrugated telescopic sleeve 431 enables the oil tank 43 to form a telescopic structure. With the cooperation of the baffle 432, when the baffle 432 is under force, the corrugated telescopic sleeve 431 contracts evenly, squeezing the hydraulic oil inside the oil tank 43. This causes the hydraulic oil pressure to rise and squeeze the first warning mechanism 44, thus achieving the purpose of the first warning mechanism 44 to issue a warning. When the oil tank 43 is no longer squeezed, the first warning mechanism 44 drives the corrugated telescopic sleeve 431 to reset, replacing the existing metal friction collision warning structure. This reduces metal wear, does not affect the accuracy of the preset torque, improves safety, and is convenient for use in flammable and explosive environments.

[0052] like Figure 6 As shown, the first warning mechanism 44 (such as...) Figure 4 (As shown) includes a first sliding sleeve 441 disposed on a first connecting shaft 42, a first rotating rod 442 rotatably connected to the first sliding sleeve 441, and an oil reservoir 43 (as shown) Figure 3 As shown, a first connecting pipe 443 is provided on the first connecting pipe 443, a first piston 444 is slidably connected inside the first connecting pipe 443, a push plate 445 is provided at the top of the first piston 444, a second connecting shaft 446 is provided at the bottom of the first piston 444, a connecting plate 447 is provided at the end of the second connecting shaft 446, a first rotating rod 442 is rotatably connected to the connecting plate 447, and a third spring 448 is sleeved on the second connecting shaft 446.

[0053] It is worth noting that when the preset torque is applied, the tensioning mechanism 41 (such as...) Figure 2 (As shown) Drives the first connecting shaft 42 to move, which in turn drives the first sliding sleeve 441 to move, which in turn drives the first rotating rod 442 to lift the connecting plate 447, which in turn drives the third spring 448 to compress a certain distance, thereby achieving the preset torque. In use, as the wrench mechanism 2 (as shown) moves, it will move. Figure 2The rotation of (as shown) drives the extrusion mechanism 47 (as shown) to rotate. Figure 3 (As shown) Squeeze oil storage tank 43 (e.g.) Figure 3 As shown, the hydraulic oil pressure in the oil reservoir 43 increases until it exceeds the force of the third spring 448. At this point, the first piston 444 slides upward under force, causing the third spring 448 to be further compressed. As the first piston 444 slides upward, it causes the push plate 445 to move upward. The movement of the push plate 445 serves as a warning to the user, facilitating use in noisy environments. After use, the first connecting shaft 42 is reset by the squeezing mechanism 47. At this time, the third spring 448 is reset, causing the first piston 444 to move downward, thus automatically resetting the oil reservoir 43.

[0054] like Figure 5 As shown, the extrusion mechanism 47 (e.g.) Figure 3 (As shown) includes a drive rod 21 (as shown) Figure 3 The second connecting rod 471 (as shown) is connected to the bushing 1 (as shown). Figure 2 As shown) there is a corresponding pair of oil storage tanks 43 (e.g. Figure 3 A second sliding sleeve 472 is slidably connected between the two (as shown). A slider 473 is provided on the second connecting rod 471. A groove 474 is provided on the second sliding sleeve 472, and the slider 473 is slidably connected to the groove 474.

[0055] It is worth noting that when using this preset torque wrench, by pushing the bushing 1 to rotate, the drive rod 21 is driven to rotate, thereby tightening the bolt. As the user applies force, the drive rod 21 rotates around the pin 23, thereby driving the second connecting rod 471 to move. The second connecting rod 471 drives the slider 473 to slide in the slide groove 474, thereby driving the second sliding sleeve 472 to move. The second sliding sleeve 472 presses against the baffle 432 (e.g., ...). Figure 6 As shown), so that the corrugated expansion sleeve 431 (as shown) Figure 6 As shown, the oil tank 43 is compressed under force, thereby squeezing the oil tank (as shown). Figure 3 The purpose is as shown.

[0056] like Figure 9-11 As shown, the protection mechanism 5 includes a component disposed on the first connecting shaft 42 (e.g., Figure 6 The one-way valve 51 on (as shown) Figure 4 As shown), the one-way valve 51 is located in the oil reservoir 43 (as shown). Figure 4 On the outside of (as shown), bushing 1 (as shown) Figure 2 A second connecting pipe 52 is provided inside the second connecting pipe 52, a one-way valve 51 is provided inside the second connecting pipe 52, and a thrust mechanism 53 (as shown) is provided on the second connecting pipe 52. Figure 4 As shown), used to actuate the bidirectional pawl 32 (as shown). Figure 4 (As shown) rotates with ratchet 31 (as shown) Figure 4As shown, the one-way valve 51 includes a plug shaft 511 slidably connected to the first connecting shaft 42. One end of the plug shaft 511 is provided with a second top ball 512. A fourth spring 513 is sleeved on the plug shaft 511. A through hole is opened on one side of the oil tank 43. A sealing ring 514 is provided on the through hole. The sealing ring 514 abuts against the second top ball 512. The second connecting pipe 52 communicates with the inside of the oil tank 43 through the through hole.

[0057] It is worth noting that when the torque wrench is used, as the hydraulic oil pressure in the reservoir 43 increases, it pushes the first piston 444 (e.g., Figure 6 As shown, it rises, thereby driving the push plate 445 (as shown) to rise. Figure 6 As shown, the pressure of the hydraulic oil in the reservoir 43 continues to rise as the torque wrench is applied, without the user noticing the warning of the push plate 445 rising. At this time, the check valve 51 opens under pressure, and the spring force of the fourth spring 513 on the check valve 51 is greater than that of the third spring 448 (as shown). Figure 6 As shown, the spring force is such that when the preset torque is applied, the first connecting shaft 42 moves, pulling the fourth spring 513 to compress, increasing the initial spring force, and adapting to different preset torques. Only when the third spring 448 is compressed to a certain value and the hydraulic oil pressure in the oil tank 43 is too high, will the fourth spring 513 be compressed. At this time, the hydraulic oil pressure in the oil tank 43 pushes the second top ball 512 away from the sealing ring 514, so that the second connecting pipe 52 is connected to the inside of the oil tank 43. As the hydraulic oil is introduced into the second connecting pipe 52, it pushes the thrust mechanism 53 to start. Through the thrust mechanism 53, the bidirectional pawl 32 is separated from the ratchet 31, realizing the unloading of force, so that the user cannot continue to tighten the bolt. At the same time, it protects the internal structure of the torque wrench and prevents the user from using it violently and causing damage.

[0058] like Figure 9 and Figure 11 As shown, the thrust mechanism 53 (such as...) Figure 4 (As shown) includes a sliding connection to the second connecting pipe 52 (e.g.) Figure 10 The second piston 531 (as shown) is equipped with a guide shaft, which is slidably connected to the second connecting pipe 52. A second rotating rod 532 is rotatably connected to the guide shaft. A push block 534 is provided at the end of the second rotating rod 532. The push block 534 has a semi-ring structure and a bidirectional pawl 32 (as shown). Figure 4 A pair of stop levers 533 are provided on the (as shown), and the ends of the stop levers 533 are adapted to the semi-ring structure of the push block 534. When one side of the bidirectional pawl 32 is engaged with the ratchet 31 (as shown), Figure 4 When the two levers (shown) are engaged, the lever 533, which is far from its engagement position, abuts against the push block 534, while the other lever 533 moves away from the push block 534.

[0059] It is worth noting that when the hydraulic oil in the oil reservoir 43 flows into the second connecting pipe 52, it pushes the second piston 531 to move. The second piston 531 drives the second rotating rod 532 on the guide shaft to move, which causes the push block 534 to push the stop lever 533 to move. When the thrust reaches a certain value, the bidirectional pawl 32 is rotated under force, causing the bidirectional pawl 32 to separate from the ratchet 31, thereby releasing the force. This prevents the user from tightening the bolt when applying force, thus preventing damage from violent use and achieving the purpose of protecting the torque wrench.

[0060] Example 2: Reference Figure 8 As shown, according to the first warning mechanism 44 proposed in Embodiment 1, this embodiment provides a further technical solution for the first warning mechanism 44, wherein a second warning mechanism 45 is provided on the bushing 1 for issuing a warning when the torque reaches a preset value (e.g., ...). Figure 4 As shown), the second warning mechanism 45 includes a bushing 1 (as shown). Figure 2 The mounting block 451 (shown) has a cavity inside, and the push plate 445 is slidably connected to the cavity. An airflow pipe 452 is provided on the mounting block 451, and the cavity is connected to the outside through the airflow pipe 452. A reed 453 is provided inside the airflow pipe 452 for vibrating and producing sound when airflow passes through.

[0061] It is worth noting that in the oil storage tank 43 (such as...) Figure 3 When the hydraulic oil pressure inside the cavity increases, pushing the push plate 445 upward, the rising push plate 445 compresses the air in the cavity, causing the airflow pipe 452 to be discharged. When the airflow passes through the airflow pipe 452, it drives the reed 453 to vibrate and produce sound, reminding the user that the torque has reached the preset value. This makes it convenient to use in quiet environments. Moreover, the reed 453 is a conventional plastic structure, and its vibration and sound generation will not cause metal friction, thus improving the safety of use.

[0062] Example 3: Reference Figure 7-8 As shown, according to Embodiment 2, the second warning mechanism 45 (such as...) Figure 4 As shown), this embodiment provides a further technical solution for the second warning mechanism 45, wherein the mounting block 451 is provided with a third warning mechanism 46 for issuing a warning when the torque reaches a preset value (as shown). Figure 4 As shown), the third warning mechanism 46 includes a flip cover 461 rotatably connected to the mounting block 451 for blocking the top of the airflow pipe 452. The flip cover 461 is provided with a fifth spring for driving the flip cover 461 to rotate and reset. The flip cover 461 is provided with a gear 462. A rack 463 is slidably connected inside the mounting block 451, and the gear 462 meshes with the rack 463. A warning plate 464 is provided on the rack 463, and the warning plate 464 is slidably connected to the mounting block 451.

[0063] It is worth noting that when the oil tank is 43 (e.g., Figure 3 When the hydraulic oil pressure inside the device increases, pushing the push plate 445 upward, airflow passes through the airflow pipe 452. During this process, the reed 453 vibrates and produces sound, pushing the flip cover 461 to rotate and open. This causes the fifth spring to be compressed, and the flip cover 461 opens a smaller opening, narrowing the airflow in the airflow pipe 452 and increasing the airflow velocity. This, in turn, increases the vibration frequency of the reed 453, increases the volume of the vibration, and improves the warning effect. After the warning is completed, when the user releases the lever, the fifth spring drives the flip cover 461 to rotate and reset, covering and protecting the airflow pipe 452. At the same time, as the flip cover 461 rotates and opens, it drives the gear 462 to rotate. The gear 462 drives the rack 463, which in turn drives the warning plate 464 to move. This causes the warning plate 464 to be misaligned with the mounting block 451 and exposed, making it easier for the user to observe and thus improving the warning effect.

[0064] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0065] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0066] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. An explosion-proof preset torque wrench, comprising a bushing (1) and a wrench mechanism (2) disposed on the bushing (1); characterized in that, The bushing (1) is provided with a torque preset mechanism (4) for preset torque, and the wrench mechanism (2) is provided with a protection mechanism (5) for unloading force when the wrench mechanism (2) is subjected to excessive force. The torque preset mechanism (4) includes a tensioning mechanism (41), the output end of which is connected to a first connecting shaft (42). A pair of oil tanks (43) are provided inside the bushing (1), and the oil tanks (43) are filled with hydraulic oil. The first connecting shaft (42) is inserted into the oil tank (43). A first alarm mechanism (44) is provided on the first connecting shaft (42) corresponding to the oil tank (43). A squeezing mechanism (47) is provided on the wrench mechanism (2). When the torque reaches the preset value, it is used to squeeze the oil tank (43) to push the first alarm mechanism (44) to issue an alarm. The first warning mechanism (44) includes a first sliding sleeve (441) disposed on a first connecting shaft (42), a first rotating rod (442) rotatably connected to the first sliding sleeve (441), a first connecting pipe (443) disposed on the oil tank (43), a first piston (444) slidably connected inside the first connecting pipe (443), a push plate (445) disposed at the top of the first piston (444), a second connecting shaft (446) disposed at the bottom of the first piston (444), a connecting plate (447) disposed at the end of the second connecting shaft (446), the first rotating rod (442) rotatably connected to the connecting plate (447), and a third spring (448) sleeved on the second connecting shaft (446). The bushing (1) is provided with a second warning mechanism (45) for warning when the torque reaches a preset value. The second warning mechanism (45) includes a mounting block (451) provided on the bushing (1). A cavity is provided in the mounting block (451). The push plate (445) is slidably connected in the cavity. An airflow pipe (452) is provided on the mounting block (451), and the cavity is connected to the outside through the airflow pipe (452). A reed (453) is provided in the airflow pipe (452) for vibrating and making a sound when the airflow passes through. The mounting block (451) is provided with a third warning mechanism (46) for issuing a warning when the torque reaches a preset value. The third warning mechanism (46) includes a flip cover (461) rotatably connected to the mounting block (451) for blocking the top of the airflow pipe (452). The flip cover (461) is provided with a fifth spring for driving the flip cover (461) to rotate and reset. The flip cover (461) is provided with a gear (462). A rack (463) is slidably connected inside the mounting block (451), and the gear (462) meshes with the rack (463). A warning plate (464) is provided on the rack (463), and the warning plate (464) is slidably connected to the mounting block (451).

2. The explosion-proof preset torque wrench according to claim 1, characterized in that, The wrench mechanism (2) includes a drive rod (21) and a drive block (22) disposed at the end of the drive rod (21). The bushing (1) is sleeved on the drive rod (21). A pin (23) is disposed between the bushing (1) and the drive rod (21). The drive rod (21) is rotatably connected to the bushing (1) through the pin (23).

3. The explosion-proof preset torque wrench according to claim 2, characterized in that, It also includes a reversing mechanism (3) for changing the driving direction of the torque wrench. The reversing mechanism (3) includes a ratchet (31) disposed on the drive block (22). A bidirectional pawl (32) is rotatably connected inside the drive rod (21). A limiting mechanism is provided inside the drive rod (21) for keeping one side of the bidirectional pawl (32) engaged with the ratchet (31). The limiting mechanism includes a first spring (33) disposed in the drive rod (21), the end of the first spring (33) is provided with a first top ball (34), the bidirectional pawl (32) is provided with a pair of grooves (35), the first top ball (34) abuts against one of the grooves (35), and the bidirectional pawl (32) is provided with a reversing push rod (36) for driving the bidirectional pawl (32) to rotate; When one side of the bidirectional pawl (32) engages with the ratchet (31), the drive rod (21) drives the drive block (22) on the ratchet (31) to rotate clockwise; when the other side of the bidirectional pawl (32) engages with the ratchet (31), the drive rod (21) drives the drive block (22) on the ratchet (31) to rotate counterclockwise.

4. The explosion-proof preset torque wrench according to claim 1, characterized in that, The oil tank (43) includes a corrugated telescopic sleeve (431) and a baffle (432) disposed on one side of the corrugated telescopic sleeve (431). By squeezing the baffle (432), the corrugated telescopic sleeve (431) is compressed, thereby increasing the hydraulic oil pressure and squeezing the first warning mechanism (44) to issue a warning.

5. The explosion-proof preset torque wrench according to claim 2, characterized in that, The extrusion mechanism (47) includes a second connecting rod (471) connected to the drive rod (21). A second sliding sleeve (472) is slidably connected between a pair of oil storage tanks (43) inside the bushing (1). A slider (473) is provided on the second connecting rod (471). A sliding groove (474) is provided on the second sliding sleeve (472), and the slider (473) is slidably connected to the sliding groove (474).

6. The explosion-proof preset torque wrench according to claim 3, characterized in that, The protection mechanism (5) includes a one-way valve (51) disposed on the first connecting shaft (42). The one-way valve (51) is disposed on the outside of the oil reservoir (43). A second connecting pipe (52) is disposed inside the bushing (1). The one-way valve (51) is disposed inside the second connecting pipe (52). A thrust mechanism (53) is disposed on the second connecting pipe (52) for pushing the bidirectional pawl (32) to rotate and separate from the ratchet (31). Includes a slidable insert shaft (511) connected to the first connecting shaft (42), one end of the insert shaft (511) is provided with a second top ball (512), a fourth spring (513) is sleeved on the insert shaft (511), a through hole is opened on one side of the oil tank (43), a sealing ring (514) is provided on the through hole, the sealing ring (514) abuts against the second top ball (512), and the second connecting pipe (52) communicates with the inside of the oil tank (43) through the through hole; The thrust mechanism (53) includes a second piston (531) slidably connected to the second connecting pipe (52). The second piston (531) is provided with a guide shaft, which is slidably connected to the second connecting pipe (52). A second rotating rod (532) is rotatably connected to the guide shaft. A push block (534) is provided at the end of the second rotating rod (532). The push block (534) is a semi-ring structure. A pair of stop bars (533) are provided on the bidirectional pawl (32). When one side of the bidirectional pawl (32) is engaged with the ratchet (31), the stop bar (533) away from its engagement position abuts against the push block (534), and the other stop bar (533) is away from the push block (534).

7. The explosion-proof preset torque wrench according to claim 1, characterized in that, The tensioning mechanism (41) is fitted with an adjusting sleeve (411) on the bushing (1). A screw (412) is provided inside the adjusting sleeve (411), and the bushing (1) is fitted on the screw (412). A threaded sleeve (413) is provided inside the bushing (1). The threaded sleeve (413) is threaded on the screw (412). A second spring (414) is fitted on the upper part of the screw (412). A first connecting rod (415) is provided at the end of the screw (412). One end of the second spring (414) is connected to the first connecting rod (415). One end of the second spring (414) is connected to the bushing (1). The end of the first connecting rod (415) is connected to the first connecting shaft (42).

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