Preset torque wrench

Abstract

The invention belongs to the technical field of wrenches, and particularly relates to a preset torque wrench which comprises a wrench body, the wrench body comprises a connecting part, a holding part and a working end part, and the holding part and the working end part are arranged at the two ends of the connecting part respectively. A transmission shaft I for outputting power to the working end part is arranged in the connecting shell I; the second connecting shell is of a hollow shell structure and is arranged on the radial outer side of the first connecting shell in the length direction of the first connecting shell; the preset adjusting mechanism is arranged in the second connecting shell; and the motor is arranged in the second connecting shell, a motor shaft of the motor is in transmission connection with the preset adjusting mechanism, and the motor is used for driving the preset adjusting mechanism to preset torsion or driving the preset adjusting mechanism to output power to the first transmission shaft. The multifunctional wrench has the beneficial effects that automatic adjustment of torque output and preset force of the wrench can be achieved by controlling the motor, and compared with a traditional mode of manually adjusting a force application sleeve rod, the multifunctional wrench is faster and more convenient to use and higher in working efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of wrenches, and in particular to a preset torque wrench. Background Art

[0002] A preset torque wrench is a tool used to apply a preset torque value and is widely used in scenarios where the tightening force of fasteners such as bolts and nuts needs to be controlled.

[0003] In the prior art, after twisting the force sleeve rod, it is necessary to lock the force sleeve rod before use to prevent the force sleeve rod from sliding during use. There are many steps to set the torque, which is inefficient. In addition, the force sleeve rod is easily loosened or adjusted incorrectly due to the negligence of the operator. Therefore, it is urgent to design a wrench that can automatically preset the torque to solve the above problems. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a preset torque wrench to solve the above problems.

[0005] The technical solution of the present invention is implemented as follows: a preset torque wrench includes a wrench body, the wrench body includes a connecting portion and a gripping portion and a working end portion respectively arranged at both ends of the connecting portion, and the connecting portion includes: The connecting shell 1 is a hollow shell structure, and a transmission shaft 1 for outputting power to the working end is arranged inside the connecting shell 1; The second connecting shell is a hollow shell structure and is arranged radially outside the first connecting shell along the length direction of the first connecting shell; A preset adjustment mechanism is arranged in the second connecting housing; A motor is disposed in the second connection housing, the motor shaft of the motor is drivingly connected to the preset adjustment mechanism, and is used to drive the preset adjustment mechanism to preset torque or drive the preset adjustment mechanism to output power to the first transmission shaft; A through opening is provided between the connecting shell 1 and the connecting shell 2, and at least a part of the preset adjustment mechanism extends into the connecting shell 1 through the through opening to be transmission-connected with the transmission shaft 1.

[0006] Furthermore, the preset adjustment mechanism includes: The switching head is fixedly mounted on the end of the motor shaft, and a shaft sleeve is arranged at one end of the switching head away from the motor shaft, and a plurality of ratchet teeth are arranged on the radial outer side of the shaft sleeve along the circumferential direction; The prismatic shaft has a hollow tubular structure inside, one end of the prismatic shaft is sleeved on the outside of the shaft sleeve, and a ratchet pawl 1 that matches with a ratchet tooth 1 is arranged on the radial inner side of the prismatic shaft. When the motor shaft rotates clockwise, the prismatic shaft rotates clockwise synchronously; A torque adjustment disk is sleeved on the outside of the prismatic shaft and is provided in plurality; A rotating disk is located on the side of the prismatic shaft away from the switching head; Adjustment rod, fixedly installed on the side of the rotating disk facing the torque adjustment disk Wherein, an accommodating groove for the adjusting rod to pass through is provided on the outer edge of the torque adjusting disk.

[0007] Furthermore, the preset adjustment mechanism includes: The fixed disk is located on the side of the rotating disk away from the torque adjustment disk. A slide groove 1 along the length direction of the connecting shell 2 is provided on the inner wall of the connecting shell 2. The fixed disk is vertically arranged and radially fixed to one side of the slide groove 1. One end of the rotating disk is rotatably connected to the fixed disk.

[0008] Furthermore, the preset adjustment mechanism includes: Two sliding rods are arranged in a transverse interval, one end of the sliding rod is fixedly installed on the end of the fixed plate away from the rotating plate, and the other end is slidably installed in the first slide groove; The second transmission shaft is located in the prismatic shaft, one end of which is inserted into the inner side of the shaft sleeve, and the other end is rotatably connected to the inner wall of the second connecting shell. A through hole is opened in the middle of the rotating disk and the fixed disk for the second transmission shaft to pass through. A plurality of ratchet teeth are arranged circumferentially on the radial inner side of the sleeve, and a ratchet pawl matched with the ratchet teeth is arranged on the radial outer side of the transmission shaft. When the motor shaft rotates counterclockwise, the transmission shaft rotates counterclockwise synchronously. The transmission plate is located between the two sliding rods and is arranged horizontally; Transmission teeth 1, a plurality of transmission teeth 1 are integrally formed on one side of the two sliding rods facing the transmission disc; Bevel gear 1 is key-connected to the outside of transmission shaft 2 and is located below the transmission plate; Bevel gear 2, a transmission shaft 3 is fixedly mounted on the lower end of the transmission plate, and the end of the transmission shaft 3 is key-connected with a bevel gear 2 meshing with the bevel gear 1; The second transmission tooth is provided with a plurality of teeth, which are integrally formed on the semi-arc surface on the radial outer side of the transmission disc and are used for meshing with the first transmission tooth for transmission; When the transmission tooth 2 is engaged with the transmission tooth 1 on one of the sliding rods, the transmission tooth 1 on the other sliding rod is disengaged from the transmission plate; Among them, a connecting shaft is fixedly installed on the upper end of the transmission disc, and the end of the connecting shaft is rotatably connected to the upper side wall of the connecting shell two.

[0009] Furthermore, a plurality of transmission teeth three are arranged along the circumference of the radial outer side of the rotating disk, and a gear shaft meshing with the transmission teeth three is fixedly mounted at one end of the transmission shaft one.

[0010] Further, the torque adjustment disk comprises: An outer disk body, wherein a through hole is provided in the middle of the outer disk body; The inner disc body is located in the through hole of the outer disc body and is sleeved on the outer side of the prismatic shaft; A slider is slidably mounted on the arc-shaped slot; The arc groove is opened on the radial inner wall of the outer disk body. A spring is arranged in the arc groove. One end of the spring is fixedly installed on the groove wall on one side of the arc groove, and the other end is connected and fixed to the slider.

[0011] Further, the working end comprises: A connector, one end of which is connected to the end of the connecting shell through a thread; The transmission shaft 4 is rotatably connected to the inner side of the connector, and the two ends of the transmission shaft 4 are respectively connected to the upper and lower ends for outputting power to the outside; Among them, the middle part of the transmission shaft four is key-connected with a worm wheel, and one end of the transmission shaft one extends into the connecting head and is key-connected with a worm matched with the worm wheel.

[0012] Furthermore, a displacement sensor for measuring the displacement of the fixed plate is fixedly installed at the bottom of the second slide groove, a touch screen is installed on the outer side of the second connecting shell, and a control circuit board electrically connected to the touch screen, the displacement sensor and the motor is installed on the inner side of the second connecting shell.

[0013] The beneficial effects of the present invention are: The torque output and preset force of the wrench can be automatically adjusted by controlling the motor. Compared with the traditional method of manually adjusting the force sleeve, it is faster, more convenient and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 This is a schematic diagram of the overall structure of a torque wrench according to a specific embodiment of the present invention; Figure 2 A partial cross-sectional view of a torque wrench according to a specific embodiment of the present invention Figure 1 ; Figure 3 This is a schematic diagram of the structure of a torque adjustment disk according to a specific embodiment of the present invention; Figure 4 A partial cross-sectional view of a torque wrench according to a specific embodiment of the present invention Figure 2 Figure 5 A partial cross-sectional view of a torque wrench according to a specific embodiment of the present invention Figure 3 ; Figure 6 A partial cross-sectional view of a torque wrench according to a specific embodiment of the present invention Figure 4 . DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0018] Embodiment 1: like Figures 1 to 6 As shown, the present invention discloses a preset torque wrench, comprising a wrench body 1, the wrench body 1 comprising a connecting portion 2 and a gripping portion 3 and a working end portion 4 respectively arranged at both ends of the connecting portion 2, the connecting portion 2 comprising: The connecting shell 200 is a hollow shell structure, and a transmission shaft 201 for outputting power to the working end 4 is arranged inside the connecting shell 200; The second connecting shell 202 is a hollow shell structure and is arranged radially outside the first connecting shell 200 along the length direction of the first connecting shell 200; The preset adjustment mechanism is arranged in the second connection housing 202; The motor 203 is disposed in the second connection housing 202, and the motor shaft of the motor 203 is drivingly connected with the preset adjustment mechanism, and is used to drive the preset adjustment mechanism to preset torque or drive the preset adjustment mechanism to output power to the transmission shaft 1 201; A through opening is provided between the connection housing 1 200 and the connection housing 2 202 , and at least a part of the preset adjustment mechanism extends into the connection housing 1 200 through the through opening to be transmission-connected with the transmission shaft 1 201 .

[0019] In this solution, the motor can be powered by an external power cord or a battery pre-installed in the grip portion.

[0020] By adopting the above technical solution, the torque output and preset force of the wrench can be automatically adjusted by controlling the motor. Compared with the traditional method of manually adjusting the force sleeve, it is faster, more convenient and more efficient.

[0021] Embodiment 2: This embodiment provides a preset torque wrench, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0022] Furthermore, the preset adjustment mechanism includes: The switching head 300 is fixedly mounted on the end of the motor shaft. A shaft sleeve is arranged at one end of the switching head 300 away from the motor shaft, and a plurality of ratchet teeth are arranged on the radial outer side of the shaft sleeve along the circumferential direction. The prismatic shaft 301 has a hollow tubular structure inside, one end of which is sleeved on the outside of the shaft sleeve, and a ratchet pawl 1 that matches with ratchet tooth 1 is provided on the radial inner side of the prismatic shaft 301. When the motor shaft rotates clockwise, the prismatic shaft 301 rotates clockwise synchronously; The torque adjustment disk 302 is sleeved on the outside of the prismatic shaft 301 and is provided in plurality; The rotating disk 303 is located on the side of the prismatic shaft 301 away from the switching head 300; The adjusting rod 304 is fixedly mounted on the side of the rotating disk 303 facing the torque adjusting disk 302 The outer edge of the torque adjustment disk 302 is provided with a receiving groove for the adjustment rod 304 to pass through.

[0023] By adopting the above technical solution, through the action of the switching head, when the motor rotates clockwise, the prismatic shaft can be driven to rotate clockwise synchronously through the shaft sleeve of the switching head, and the prismatic shaft outputs power to the rotating disk through the torque adjustment disk and the adjustment rod, so that the rotating disk rotates synchronously to output power to the transmission shaft.

[0024] Embodiment 3: This embodiment provides a preset torque wrench, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0025] Furthermore, the preset adjustment mechanism includes: The fixed disk 400 is located on the side of the rotating disk 303 away from the torque adjustment disk 302. The inner wall of the connecting shell 202 is provided with a slide groove 1 along the length direction of the connecting shell 202. The fixed disk 400 is vertically arranged and radially fixed to one side of the slide groove 1. One end of the rotating disk 303 is rotatably connected to the fixed disk 400 .

[0026] By adopting the above technical solution, the arrangement of the circular disk can play a role in auxiliary support of the rotating disk, so that the power output of the rotating disk can be more stable.

[0027] Embodiment 4: This embodiment provides a preset torque wrench, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0028] Furthermore, the preset adjustment mechanism includes: Two sliding rods 500 are arranged in a transverse interval, one end of the sliding rod 500 is fixedly installed on the end of the fixed disk 400 away from the rotating disk 303, and the other end is slidably installed in the first slide groove, that is, the fixed disk 400 is radially limited by the cooperation between the sliding rod and the first slide groove; The second transmission shaft 501 is located in the prismatic shaft 301, one end of which is inserted into the inner side of the sleeve, and the other end is rotatably connected to the inner wall of the second connecting shell 202. A through hole for the second transmission shaft 501 to pass through is opened in the middle of the rotating disk 303 and the fixed disk 400. A plurality of ratchet teeth 2 are arranged on the radial inner side of the sleeve along the circumferential direction, and a ratchet pawl 2 cooperating with the ratchet teeth 2 is arranged on the radial outer side of the second transmission shaft 501. When the motor shaft rotates counterclockwise, the second transmission shaft 501 rotates counterclockwise synchronously. The transmission plate 502 is located between the two sliding rods 500 and is arranged horizontally; Transmission teeth 1 503: a plurality of transmission teeth 1 503 are integrally formed on one side of the two sliding rods 500 facing the transmission plate 502; Bevel gear 1 5031 is key-connected to the outside of transmission shaft 2 501 and is located below transmission disc 502; Bevel gear 2 5032, a transmission shaft 3 is fixedly mounted on the lower end of the transmission plate 502, and a bevel gear 2 5032 meshing with bevel gear 1 5031 is keyed to the end of the transmission shaft 3; The second transmission teeth 504 are provided in plurality and are integrally formed on the semi-arc surface on the radial outer side of the transmission disc 502, and are used for meshing and transmitting with the first transmission teeth 503; When the transmission tooth 2 504 is engaged with the transmission tooth 1 503 on one of the sliding rods 500, the transmission tooth 1 503 on the other sliding rod 500 is disengaged from the transmission plate 502; A connecting shaft is fixedly installed on the upper end of the transmission disc 502 , and the end of the connecting shaft is rotatably connected to the upper side wall of the second connecting shell 202 .

[0029] By adopting the above technical solution, when the motor rotates counterclockwise, the switching head drives the transmission shaft 2 to rotate synchronously. At this time, the prismatic shaft does not rotate, and the transmission shaft 2 drives the bevel gear 1 5031 to rotate counterclockwise. Since the bevel gear 1 5031 is meshed with the bevel gear 2 5032, the transmission disk can continue to rotate counterclockwise. When the teeth on the transmission disk are meshed with the transmission teeth 1 on the rear side of the transmission disk, the sliding rod can be driven to be pulled out to the left, so that the adjustment rod is separated from the partial torque adjustment disk to reduce the torque. When the teeth on the transmission disk are meshed with the transmission teeth 1 on the rear side of the transmission disk, the sliding rod can be driven to be pushed out to the right, so that the adjustment rod cooperates with the partial torque adjustment disk to increase the torque. When adjusting the torque, the motor only needs to be reversed, and there is no need to frequently adjust the forward and reverse directions.

[0030] Embodiment 5: This embodiment provides a preset torque wrench, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0031] Furthermore, a plurality of transmission teeth 3 are arranged along the circumference of the radial outer side of the rotating disk 303, and a gear shaft meshing with the transmission teeth 3 is fixedly mounted on one end of the transmission shaft 1 201.

[0032] By adopting the above technical solution, the transmission tooth three is meshed with the gear shaft through the opening, and the arrangement of the gear shaft ensures that the rotating disk will not be disengaged from the transmission tooth three when it moves left and right.

[0033] Embodiment 6: This embodiment provides a preset torque wrench, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0034] Further, the torque adjustment disk 302 includes: The outer disk body 3021 has a through hole in the middle thereof; The inner plate 3022 is located in the through hole of the outer plate 3021 and sleeved on the outer side of the prismatic shaft 301; A slider is slidably mounted on the arc-shaped slot; The arc groove is formed on the radial inner wall of the outer disk body 3021. A spring is arranged in the arc groove. One end of the spring is fixedly mounted on the groove wall on one side of the arc groove, and the other end is connected and fixed to the slider.

[0035] In the above technical solution, a circuit board for transmitting a stop signal to the motor is embedded in the outer disk body adjacent to the rotating disk, and static contacts 1 are arranged on both sides of the edge of the arc-shaped slot, and the static contacts 1 are electrically connected to the circuit board. Two interconnected static contacts 2 are embedded on both sides of the slider, and when the two static contacts 1 are in contact with the static contacts 2, the signal transmitting unit on the circuit board sends a stop signal to the motor control circuit board; In the above technical solution, the above circuit board can be powered by a battery embedded in the outer disk body, and the battery can be replenished by wireless charging; In the above technical solution, the motor is an electromagnetic brake type motor with an electromagnetic brake, and the electromagnetic brake can lock its rotating shaft after the motor is powered off. The wrench is reset by the elastic force of the spring after the bolt and nut are separated after use. The specific structure of the electromagnetic brake belongs to the prior art and will not be discussed in this embodiment. By adopting the above technical solution, when the prismatic shaft rotates, it drives the inner disk body to drive the slider to rotate, and then drives the outer disk body to rotate through the action of the spring to drive the rotating disk to rotate. When a certain torque is reached, the spring is compressed and the slider moves along the arc groove. When the slider moves to a stationary contact, the circuit board is energized to transmit a stop signal to stop the motor and avoid damage to the bolts.

[0036] Embodiment 7: This embodiment provides a preset torque wrench, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0037] Further, the working end 4 comprises: A connector, one end of which is connected to the end of the connecting housing 200 through a thread; The transmission shaft 4 is rotatably connected to the inner side of the connector, and the two ends of the transmission shaft 4 are respectively connected to the upper and lower ends for outputting power to the outside; Among them, the middle part of the transmission shaft 4 is keyed to a worm wheel, and one end of the transmission shaft 1 201 extends into the connecting head and is keyed to a worm matched with the worm wheel.

[0038] In the above technical solution, the two ends of the transmission shaft 4 are connected with prisms for connecting bolt sleeves of different specifications; By adopting the above technical solution, when the transmission shaft 1 rotates, power is output to the worm wheel through the worm, so as to drive the transmission shaft 4 to rotate and output power.

[0039] Embodiment 8: This embodiment provides a preset torque wrench, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0040] Furthermore, a displacement sensor 600 for measuring the displacement of the fixed plate is fixedly installed at the bottom of the second slide groove, a touch screen 601 is installed on the outer side of the second connecting shell 202, and a control circuit board electrically connected to the touch screen 601, the displacement sensor 600 and the motor is installed on the inner side of the second connecting shell 202.

[0041] By adopting the above technical solution, through the coordinated setting of the touch display screen and the control circuit board, intelligent control of the torque wrench can be achieved, so that the work efficiency is greatly improved.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A preset torque wrench, comprising a wrench body (1), the wrench body (1) comprising a connecting portion (2) and a gripping portion (3) and a working end portion (4) respectively arranged at both ends of the connecting portion (2), characterized in that: The connecting part (2) comprises: The connecting shell (200) is a hollow shell structure, and a transmission shaft (201) for outputting power to the working end (4) is arranged inside the connecting shell (200); The second connecting shell (202) is a hollow shell structure and is arranged radially outside the first connecting shell (200) along the length direction of the first connecting shell (200); A preset adjustment mechanism is arranged in the second connecting shell (202); The motor (203) is disposed in the second connecting housing (202), and the motor shaft of the motor (203) is drivingly connected to the preset adjustment mechanism, and is used to drive the preset adjustment mechanism to preset torque or drive the preset adjustment mechanism to output power to the first transmission shaft (201); A through opening is provided between the connection housing 1 (200) and the connection housing 2 (202), and at least part of the preset adjustment mechanism extends into the connection housing 1 (200) through the through opening to be transmission-connected with the transmission shaft 1 (201).

2. A preset torque wrench according to claim 1, characterized in that: The preset adjustment mechanism includes: A switching head (300) is fixedly mounted on the end of the motor shaft, an end of the switching head (300) away from the motor shaft is provided with a shaft sleeve, and a plurality of ratchet teeth are provided on the radial outer side of the shaft sleeve along the circumferential direction; The prismatic shaft (301) has a hollow tubular structure inside, one end of the prismatic shaft (301) is sleeved on the outside of the shaft sleeve, and a ratchet pawl (1) that matches with a ratchet tooth (1) is provided on the radial inner side of the prismatic shaft (301). When the motor shaft rotates clockwise, the prismatic shaft (301) rotates clockwise synchronously; A plurality of torque adjustment disks (302) are sleeved on the outside of the prismatic shaft (301); A rotating disk (303) is located on a side of the prismatic shaft (301) away from the switching head (300); The adjusting rod (304) is fixedly mounted on the side of the rotating disk (303) facing the torque adjusting disk (302). The outer edge of the torque adjustment disk (302) is provided with a receiving groove for the adjustment rod (304) to pass through.

3. A preset torque wrench according to claim 2, characterized in that: The preset adjustment mechanism includes: The fixed disk (400) is located on a side of the rotating disk (303) away from the torque adjustment disk (302); a slide groove 1 is provided on the inner wall of the second connecting shell (202) along the length direction of the second connecting shell (202); the fixed disk (400) is vertically arranged and radially fixed to one side of the slide groove 1; One end of the rotating disk (303) is rotatably connected to the fixed disk (400).

4. A preset torque wrench according to claim 3, characterized in that: The preset adjustment mechanism includes: Two sliding rods (500) are arranged in a transverse manner and spaced apart from each other. One end of the sliding rod (500) is fixedly mounted on an end of the fixed disk (400) away from the rotating disk (303), and the other end is slidably mounted in a sliding groove; The second transmission shaft (501) is located inside the prismatic shaft (301), one end of which is inserted into the inner side of the shaft sleeve, and the other end is rotatably connected to the inner wall of the second connecting shell (202). A through hole for the second transmission shaft (501) to pass through is opened in the middle of the rotating disk (303) and the fixed disk (400). A plurality of ratchet teeth are arranged circumferentially on the radial inner side of the sleeve, and a ratchet pawl matched with the ratchet teeth is arranged on the radial outer side of the second transmission shaft (501). When the motor shaft rotates counterclockwise, the second transmission shaft (501) rotates counterclockwise synchronously. A transmission plate (502) is located between the two sliding rods (500) and is arranged in a transverse direction; Transmission teeth one (503), a plurality of transmission teeth one (503) are integrally formed on one side of the two sliding rods (500) facing the transmission disc (502); Bevel gear 1 (5031), key-connected to the outside of transmission shaft 2 (501) and located below the transmission disc (502); Bevel gear 2 (5032), a transmission shaft 3 is fixedly mounted on the lower end of the transmission plate (502), and the end of the transmission shaft 3 is key-connected with a bevel gear 2 (5032) meshing with the bevel gear 1 (5031); The second transmission teeth (504) are provided in plurality and are integrally formed on the semi-arc surface on the radial outer side of the transmission disc (502) and are used for meshing with the first transmission teeth (503) for transmission; When the second transmission tooth (504) is meshed with the first transmission tooth (503) on one of the sliding rods (500), the first transmission tooth (503) on the other sliding rod (500) is disengaged from the transmission disk (502); A connecting shaft is fixedly mounted on the upper end of the transmission disc (502), and the end of the connecting shaft is rotatably connected to the upper side wall of the second connecting shell (202).

5. A preset torque wrench according to claim 2, characterized in that: A plurality of transmission teeth three are arranged along the circumference of the radial outer side of the rotating disk (303), and a gear shaft meshing with the transmission teeth three is fixedly mounted on one end of the transmission shaft one (201).

6. A preset torque wrench according to claim 1, characterized in that: The torque adjustment disk (302) comprises: An outer disk body (3021), wherein a through hole is formed in the middle of the outer disk body (3021); The inner disk body (3022) is located in the through hole of the outer disk body (3021) and is sleeved on the outside of the prismatic shaft (301); A slider is slidably mounted on the arc-shaped slot; The arc groove is formed on the radial inner wall of the outer disk body (3021), and a spring is arranged in the arc groove. One end of the spring is fixedly mounted on a groove wall on one side of the arc groove, and the other end is connected and fixed to the slider.

7. A preset torque wrench according to claim 1, characterized in that: The working end (4) comprises: A connector, one end of which is connected to the end of the connecting shell 1 (200) through a thread; The transmission shaft 4 is rotatably connected to the inner side of the connector, and the two ends of the transmission shaft 4 are respectively connected to the upper and lower ends for outputting power to the outside; Among them, the middle part of the transmission shaft four is key-connected with a worm wheel, and one end of the transmission shaft one (201) extends into the connecting head and is key-connected with a worm matched with the worm wheel.

8. A preset torque wrench according to claim 3, characterized in that: A displacement sensor (600) for measuring the displacement of the fixed plate is fixedly installed at the bottom of the second slide groove, a touch screen (601) is installed on the outer side of the second connecting shell (202), and a control circuit board electrically connected to the touch screen (601), the displacement sensor (600) and the motor is installed on the inner side of the second connecting shell (202).

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