A mechanical torque wrench

Abstract

A new type of mechanical torque wrench includes a driving part, a transmission part and a force-applying part. The force of the driving part is transmitted to the force-applying part through the transmission part, and the transmission part includes a first transmission part and a second transmission part which are separately arranged. When the force acts on the first transmission part, the driving part and the first transmission part form a whole, and a lever transmission is performed. When the force acts on the second transmission part, the driving part is separated from the first transmission part and contacts with the gear of the second transmission part, and a gear transmission is performed to increase the torque. The new type of mechanical torque wrench has two structural states through the arrangement of the driving part, the first transmission part, the second transmission part and the force-applying part, which can realize the initial small torque requirement and the subsequent large torque conversion, thereby improving the efficiency of tightening the locking nut.

Description

Technical Field

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

[0002] During the construction of transmission line stringing, large-sized bolts are usually used to fix the towers. Common bolt tightening methods mainly include: torque multiplier tightening and hydraulic torque wrench tightening. These two tightening methods have good tightening effects, but they have disadvantages such as high cost, heavy weight, and cumbersome operation. At present, the main tightening method is still manual tightening operation through a plum wrench. The end of the plum wrench is a fixed structure, and the rotation angle of the human hand is limited. When the wrench is used to tighten the nut, when the wrench is screwed to a certain angle, the wrench needs to be separated from the nut, and then the operation is repeated. Due to the limited force arm of the wrench, it is very laborious to use and the operation efficiency is low.

[0003] The Chinese invention patent "Planetary Gear Variable Torque Wrench" (publication number: CN104924248A) discloses a planetary gear variable torque wrench, which is mainly composed of a handle, an inner gear ring, a planet carrier, a planetary gear, a sun gear, a control gear ring and a joint. Its main features are: the handle and the planet carrier are active elements, the inner gear ring and the joint are driven elements, the sun gear and the planet carrier are connected through the control gear ring, and the control gear ring makes the transmission ratio between the planet carrier and the sun gear greater than 1; the control gear ring is fixed to the handle, eccentrically arranged with the sun gear and meshed internally; the planet carrier has a positioning block, which cooperates with the positioning hole on the handle so that the planet carrier and the handle can rotate as a whole. The sun gear meshes with both the control gear on the handle and the planetary gear on the planet carrier; the inner gear ring meshes with the planetary gear, and has a hole on it, which can be connected to the hole on the connecting plate by bolts, so that it can rotate axially with the joint as a whole.

[0004] The Chinese invention patent "A torque-converting torque wrench" (publication number: CN109514473A) discloses a torque-converting torque wrench, which is mainly composed of a force-applying rod and an output member, and a torque-converting assembly is arranged between the force-applying rod and the output member. The torque-converting assembly is an improved differential assembly, specifically, mainly including a housing, a planetary gear shaft, a planetary gear, an output gear and a torque-converting gear. The housing is a quadrilateral component, and planetary gear shaft holes are opened on two opposite faces of the quadrilateral, an output gear hole is opened on one of the other two faces, and a torque-converting gear hole is opened on the other opposite face. The planetary gear shaft passes through the planetary gear shaft hole and is positioned in the housing so that its degree of freedom is 0. There are two planetary gears, with teeth facing each other, placed in the housing, and mounted on the planetary gear shaft; the planetary gears can rotate on the planetary gear shaft, or can be fixed so that they do not rotate around the planetary gear shaft.

[0005] Although the above two patent documents can realize the torque wrench into a variable torque type, they are not suitable for the tightening of tower bolts during the construction of power transmission line stringing involved in this application.

[0006] The Chinese utility model patent "A torque wrench head and a ratchet wrench reversing structure" (publication number: CN208358662U) discloses a torque wrench head and a ratchet wrench reversing structure, which relates to the field of ratchet wrench reversing technology. The structure includes a wrench head, a gear, a tooth block and a reversing assembly. The wrench head has a first opening and a second opening. The gear is arranged in the first opening. The reversing assembly includes a reversing button, a reversing block and an elastic reversing member. The reversing button is arranged in the second opening and is connected with the tooth block. One end of the elastic reversing member is arranged on the reversing block, and the other end extends into the tooth block. When the reversing button is rotated, the reversing button can drive the reversing block to rotate, so that the elastic reversing member undergoes elastic deformation, driving the tooth block to rotate, so as to realize multi-directional reversing. The contact surface between the tooth block and the gear of this structure is large, and the torque value is 30% to 50% larger than that of the traditional structure. The torque wrench head has a large impact force due to elastic deformation, which can avoid the influence of processing accuracy and assembly accuracy on the traditional ratchet structure. It focuses on improving the sliding teeth and jamming phenomena, and does not have the functions of the two structural states that can be achieved by this application. Summary of the invention

[0007] The purpose of the present invention is to provide a new mechanical torque wrench with two structural states and capable of being quickly replaced according to the usage occasion, thereby improving the working efficiency of locking nuts.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0009] A novel mechanical torque wrench comprises a driving part, a transmission part and a force applying part, wherein the force of the driving part is transmitted to the force applying part through the transmission part, and the transmission part comprises a first transmission part and a second transmission part which are separately arranged;

[0010] When the force acts on the first transmission part, the driving part and the first transmission part are integrated to perform lever transmission;

[0011] When the force acts on the second transmission part, the driving part is separated from the first transmission part and contacts with the gear of the second transmission part, thereby performing gear transmission to increase the torque.

[0012] The driving part includes a ratchet wrench and a ratchet shaft arranged perpendicular to the ratchet wrench;

[0013] The first transmission part includes a force-adding cantilever and a positioning shaft mechanism, and the positioning shaft mechanism includes a positioning rotating shaft, a rotating hand wheel fixedly arranged on the top of the positioning rotating shaft, and a positioning protrusion fixedly arranged on the end of the positioning rotating shaft, the right end of the force-adding cantilever is provided with a positioning hole corresponding to the positioning rotating shaft and the positioning protrusion, and a limiting groove for limiting the positioning protrusion is provided at its end, and the left end of the force-adding cantilever is rotatably matched with the driving part;

[0014] The lower end of the ratchet shaft passes through the force-adding cantilever, and a driving gear is fixedly arranged at the end thereof;

[0015] A rotating shaft bracket is also connected between the positioning shaft mechanism and the ratchet shaft, and the two ends of the rotating shaft bracket are respectively sleeved on the positioning rotating shaft and the ratchet shaft, and a buffer spring is also sleeved on the ratchet shaft between the rotating shaft bracket and the force-adding cantilever;

[0016] The second transmission part includes a sector tooth and a sector tooth pad, the sector tooth is arranged on the right side of the sector tooth pad and meshes with the driving gear, and the sector tooth is arranged concentrically with the force applying part, and the left end of the sector tooth pad is rotatably matched with the force applying cantilever; the left end of the sector tooth pad is also fixed with an anti-torque arm, and the anti-torque arm is fixedly connected to the surrounding fixed objects;

[0017] When a force is required to act on the first transmission part, the positioning rotating shaft and the positioning protrusion are passed through the positioning hole to the limiting groove at the bottom, and the driving gear is driven downward to disengage from the sector tooth, and then the rotating hand wheel is turned to limit the positioning protrusion in the limiting groove, and the ratchet wrench and the force-adding cantilever are integrated;

[0018] When force is required to act on the second transmission part, the rotating hand wheel is rotated in the reverse direction to make the positioning protrusion correspond to the positioning hole and withdraw from the positioning hole. At the same time, driven by the reset spring, the driving gear rises and engages with the sector teeth for gear transmission, and acts on the force-applying part through the sector tooth pad.

[0019] The force-applying part is a stepped nut sleeve, and the upper end of the nut sleeve is set as a regular polygonal column, and the specifications of the regular polygonal column are fixed, and the lower end is provided with a locking sleeve for facilitating the positioning of the locking nut, and the locking sleeve is provided with various specifications.

[0020] The locking sleeve is a hexalobular socket structure.

[0021] The left end of the force-adding cantilever is set as a connecting sleeve with a plum blossom groove, and the connecting sleeve is clamped on the regular polygonal column at the upper end of the nut sleeve; the lower end of the connecting sleeve is also provided with a boss for positioning the fan-shaped tooth pad.

[0022] The regular polygonal prism is an outer hexagonal prism.

[0023] The beneficial effects of the present invention are:

[0024] (1) The novel mechanical torque wrench has two structural states through the arrangement of the driving part, the first transmission part, the second transmission part and the force-applying part, so that the mechanical wrench can realize the initial small torque requirement and the subsequent conversion to large torque, thereby improving the tightening efficiency of the locking nut.

[0025] (2) The outer hexagonal shape at the upper end of the nut sleeve is rotatably arranged in cooperation with the connecting sleeve at the left end of the force-adding cantilever, while the hexagonal groove at the lower end is arranged in different specifications. When tightening nuts of different sizes, it is only necessary to replace the connecting sleeve, thereby improving the versatility of the mechanical torque wrench.

[0026] (3) The new mechanical torque wrench connects various parts together by means of a sleeve ring, and realizes the replacement of the two structural states of the first transmission part and the second transmission part by means of a positioning shaft mechanism, making the conversion between lever transmission and gear transmission convenient and quick, thereby improving the locking effect of the nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the structural state diagram of the torque wrench in state one.

[0028] Figure 2 This is the structural state diagram of the torque wrench in state one.

[0029] Figure 3 It is a partial three-dimensional schematic diagram of the present invention.

[0030] Figure 4 It is a three-dimensional schematic diagram of the afterburner cantilever.

[0031] Figure 5 It is a bottom schematic diagram of the afterburner boom.

[0032] Figure 6 It is the structural state diagram of the nut sleeve. DETAILED DESCRIPTION

[0033] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0034] The present invention provides a novel mechanical torque wrench, such as Figures 1 to 6 shown.

[0035] The novel mechanical torque wrench comprises a driving part, a transmission part and a force-applying part. The force of the driving part is transmitted to the force-applying part through the transmission part, and the transmission part comprises a first transmission part and a second transmission part which are separately arranged.

[0036] When the force acts on the first transmission part, the driving part and the first transmission part form an integral whole to perform lever transmission; when the force acts on the second transmission part, the driving part is separated from the first transmission part and contacts with the gear of the second transmission part to perform gear transmission to increase the torque.

[0037] The driving part comprises a ratchet wrench 1 and a ratchet shaft 2 arranged perpendicular to the ratchet wrench 1;

[0038] The first transmission part includes a force-adding cantilever 3 and a positioning shaft mechanism 4, and the positioning shaft mechanism 4 includes a positioning rotating shaft 41, a rotating hand wheel 42 fixedly arranged at the top of the positioning rotating shaft, and a positioning protrusion 43 fixedly arranged at the end of the positioning rotating shaft. The right end of the force-adding cantilever 3 is provided with a positioning hole 31 corresponding to the positioning rotating shaft 41 and the positioning protrusion 43, and a limiting groove 32 for limiting the positioning protrusion is provided at its end, and the left end of the force-adding cantilever 3 is rotatably matched with the transmission part;

[0039] The lower end of the ratchet shaft 2 passes through the force-adding cantilever 3, and a driving gear 5 is fixedly disposed at the end thereof;

[0040] A rotating shaft bracket 44 is connected between the positioning shaft mechanism 4 and the ratchet shaft 2. Both ends of the rotating shaft bracket 44 are respectively sleeved on the positioning rotating shaft 41 and the ratchet shaft 2. A buffer spring 21 is sleeved on the ratchet shaft 2 between the rotating shaft bracket 44 and the force cantilever 3.

[0041] The second transmission part includes a sector tooth 6 and a sector tooth pad 7. The sector tooth 6 is arranged on the right side of the sector tooth pad 7 and is meshed with the driving gear 5. The sector tooth 6 is concentrically arranged with the force applying part 8, and the left end of the sector tooth pad 7 is rotatably matched with the force applying cantilever 3; the left end of the sector tooth pad 7 is also fixedly provided with an anti-torque arm 9, which is fixedly connected to the surrounding fixed objects to improve stability, ensure that the sector tooth 6 is partially in a fixed state, and achieve the effect of increasing torque by gear transmission.

[0042] In this embodiment, the force-applying part 8 is a stepped nut sleeve, and the upper end of the nut sleeve is set as a regular polygonal prism 81. Preferably, the regular polygonal prism is an outer hexagonal prism, and its lower end is provided with a locking sleeve 82 for facilitating the positioning of the locking nut, and the locking sleeve 82 is a plum blossom groove structure. The left end of the force-applying cantilever 3 is set as a connecting sleeve 33 with a plum blossom groove structure, and the connecting sleeve 33 is rotatably sleeved on the outer hexagonal prism of the nut sleeve; the lower end of the connecting sleeve 33 is also provided with a boss 311 for positioning the fan-shaped tooth pad 7.

[0043] The specifications of the outer hexagonal prism are matched with the connecting sleeve 33, and the hexagonal groove structure of the locking sleeve 82 is set to different specifications, which is convenient and fast to align the locking nut and can realize the locking of nuts of different sizes. When locking nuts of different specifications, only the nut sleeve needs to be replaced.

[0044] When force is required to act on the first transmission part, that is, initially, the locking nut does not need too much force, and there is no need to use gear transmission to increase the tightening torque. Therefore, the structural state of the torque wrench state one is used, that is; only the positioning rotating shaft 41 and the positioning protrusion 43 need to be passed through the positioning hole 31 to the bottom limit groove 32, and the angle is rotated so that the positioning protrusion 43 is stuck in the limit groove, and the driving gear 5 is driven downward to disengage from the sector tooth 6, and then the rotating hand wheel 42 is rotated to limit the positioning protrusion 43 in the limit groove 32. The ratchet wrench 1 and the force cantilever 3 are integrated to achieve the effect of increasing the force arm, and then the locking nut is tightened.

[0045] When a greater tightening force is required when rotating to the bottom, and a force is required to be applied to the second transmission part, the torque wrench is used in the second structural state, that is: the rotating hand wheel 42 is rotated in the reverse direction to make the positioning protrusion 43 correspond to the positioning hole 31 and withdraw from the positioning hole 31, and at the same time, driven by the reset spring 21, the driving gear 5 rises and engages with the sector tooth 6 for gear transmission, and acts on the connecting sleeve 33 of the force cantilever 3 through the sector tooth pad 7, and then acts on the force applying part 8, i.e., the nut sleeve, which is concentrically arranged with the sector tooth 6, to achieve torque amplification and achieve a higher locking effect for the locking nut.

[0046] When used specifically, the operating steps of the mechanical torque wrench are as follows:

[0047] 1) First, select a nut sleeve of appropriate specifications according to the size of the nut to be locked;

[0048] 2) The first transmission part and the second transmission part are matched with the nut sleeve to form a mechanical torque wrench, and then the mechanical torque wrench is sleeved on the nut to be locked through the hexagram groove at the lower end of the nut sleeve, and then the anti-torque arm 9 is fixedly connected to the surrounding fixed objects;

[0049] That is, first, the connecting sleeve 33 of the force cantilever 3 is sleeved on the outer hexagonal prism at the upper end of the nut sleeve, and then the left end of the fan-shaped tooth pad 7 is rotated and arranged on the boss 311 at the lower end of the force cantilever connecting sleeve 33, and the fan-shaped tooth 6 is concentrically arranged with the nut sleeve, and finally, it is sleeved on the nut to be locked through the plum blossom groove structure opened at the lower end of the nut sleeve.

[0050] 3) After the position is correct, the positioning rotating shaft 41 and the positioning protrusion 43 of the first transmission part are passed through the positioning hole 31 until they reach the limiting groove 32 at the bottom, and then the rotating hand wheel 42 is turned to limit the positioning protrusion 43 in the limiting groove 32, the driving gear 5 is disengaged from the sector tooth 6, and the ratchet wrench 1 and the force cantilever 3 are integrated to form a torque wrench state 1 structure, and then the ratchet wrench 1 can be turned to lock the locking nut to be locked;

[0051] 4) When it is difficult to rotate the handle of the ratchet wrench 1, the rotating hand wheel 42 is rotated in the reverse direction so that the positioning protrusion 43 corresponds to the positioning hole 31 and exits the positioning hole 31, and the driving gear 5 rises and meshes with the sector teeth 6 for gear transmission, forming the structural state of the torque wrench state 2, realizing the amplification of the torque, and achieving a higher locking effect on the nut.

[0052] If the words "first", "second" and the like are used in this patent to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of describing the present invention and simplifying the description, and the above words have no special meaning.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the invention claimed for protection. The scope of protection claimed for the present invention is defined by the attached claims and their equivalents.

[0054] In the description of the present invention, it is necessary to understand that the terms "front", "rear", "left", "right", "center", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the protection content of the present invention.

Claims

1. A mechanical torque wrench, characterized in that: It includes a driving part, a transmission part and a force-applying part, wherein the force of the driving part is transmitted to the force-applying part through the transmission part, and the transmission part includes a first transmission part and a second transmission part which are separately arranged; When the force acts on the first transmission part, the driving part and the first transmission part are integrated to perform lever transmission; When the force acts on the second transmission part, the driving part is separated from the first transmission part and contacts the gear of the second transmission part, thereby performing gear transmission with increased torque; The driving part includes a ratchet wrench and a ratchet shaft arranged perpendicular to the ratchet wrench; The first transmission part includes a force-adding cantilever and a positioning shaft mechanism, and the positioning shaft mechanism includes a positioning rotating shaft, a rotating hand wheel fixedly arranged on the top of the positioning rotating shaft, and a positioning protrusion fixedly arranged on the end of the positioning rotating shaft, the right end of the force-adding cantilever is provided with a positioning hole corresponding to the positioning rotating shaft and the positioning protrusion, and a limiting groove for limiting the positioning protrusion is provided at its end, and the left end of the force-adding cantilever is rotatably matched with the driving part; The lower end of the ratchet shaft passes through the force-adding cantilever, and a driving gear is fixedly arranged at the end thereof; A rotating shaft bracket is also connected between the positioning shaft mechanism and the ratchet shaft, and the two ends of the rotating shaft bracket are respectively sleeved on the positioning rotating shaft and the ratchet shaft, and a buffer spring is also sleeved on the ratchet shaft between the rotating shaft bracket and the force-adding cantilever; The second transmission part includes a sector tooth and a sector tooth pad, the sector tooth is arranged on the right side of the sector tooth pad and meshes with the driving gear, and the sector tooth is arranged concentrically with the force applying part, and the left end of the sector tooth pad is rotatably matched with the force applying cantilever; the left end of the sector tooth pad is also fixed with an anti-torque arm, and the anti-torque arm is fixedly connected to the surrounding fixed objects; When a force is required to act on the first transmission part, the positioning rotating shaft and the positioning protrusion are passed through the positioning hole to the limiting groove at the bottom, and the driving gear is driven downward to disengage from the sector tooth, and then the rotating hand wheel is turned to limit the positioning protrusion in the limiting groove, and the ratchet wrench and the force-adding cantilever are integrated; When force is required to act on the second transmission part, the rotating hand wheel is rotated in the reverse direction to make the positioning protrusion correspond to the positioning hole and withdraw from the positioning hole. At the same time, driven by the reset spring, the driving gear rises and engages with the sector teeth for gear transmission, and acts on the force-applying part through the sector tooth pad.

2. A mechanical torque wrench according to claim 1, characterized in that: The force-applying part is a stepped nut sleeve, and the upper end of the nut sleeve is set as a regular polygonal column, and the specifications of the regular polygonal column are fixed, and the lower end is provided with a locking sleeve for facilitating the positioning of the locking nut, and the locking sleeve is provided with various specifications.

3. A mechanical torque wrench according to claim 2, characterized in that: The locking sleeve is a hexalobular socket structure.

4. A mechanical torque wrench according to claim 2, characterized in that: The left end of the force-adding cantilever is set as a connecting sleeve with a plum blossom groove, and the connecting sleeve is clamped on the regular polygonal column at the upper end of the nut sleeve; the lower end of the connecting sleeve is also provided with a boss for positioning the fan-shaped tooth pad.

5. A mechanical torque wrench according to claim 2, characterized in that: The regular polygonal prism is an outer hexagonal prism.

Images