High-precision fast tightening device and method

Abstract

This invention discloses a high-precision, rapid tightening device, relating to the field of mechanical fastening technology. It solves the problem of cumbersome operation and high labor intensity caused by the current multi-tool combination method for installing and tightening high-torque fasteners. The high-precision, rapid tightening device of this invention includes a vertically arranged tightening rod and a torque sensor mounted on the tightening rod, as well as a primary pre-tightening mechanism and a secondary fine-tightening mechanism for driving the tightening rod to rotate along its axis. The bottom end of the tightening rod is a tightening end for connecting the fastener, and the top end is a transmission end with an edge. The primary pre-tightening mechanism is located at the top of the transmission end, and its output end is connected to the transmission end and rotates synchronously with it. The secondary fine-tightening mechanism includes a fine-tightening drive located around the tightening rod and a fine-tightening transmission assembly mounted on the tightening rod. The fine-tightening transmission assembly is located above the torque sensor, and its periphery has several circumferential teeth that mesh with the output end of the fine-tightening drive.

Description

Technical Field

[0001] This invention relates to the field of mechanical fastening technology, specifically to a high-precision, rapid tightening device and method. Background Technology

[0002] Currently, for tightening high-torque fasteners, large pneumatic torque wrenches or hydraulic wrenches are typically used for auxiliary installation and tightening. Large pneumatic torque wrenches offer the advantage of fast installation, but their installation accuracy is not high, often failing to meet installation standards in applications requiring high precision. Hydraulic wrenches, compared to large pneumatic torque wrenches, offer relatively higher installation accuracy, but due to their hydraulic drive, their installation speed is slower, resulting in a longer overall tightening time and lower installation efficiency.

[0003] To simultaneously improve the installation speed and accuracy of high-torque fasteners, the current practice is to first pre-tighten with a large pneumatic torque wrench and then use a hydraulic wrench for secondary tightening to achieve the preset tightening accuracy. However, this method of using multiple tools requires frequent changes of tightening tools during the tightening process, making it cumbersome, involving multiple installation steps, and increasing labor intensity. In addition, since tightening the same fastener requires at least two tools, the tightening process is divided into at least two parts, making it difficult to continuously monitor torque changes, thus hindering the achievement of high-precision tightening results.

[0004] Based on this, the inventors designed a high-precision and rapid tightening device and method to solve one or more of the above-mentioned problems, and thus, this application is filed. Summary of the Invention

[0005] The purpose of this application is to provide a high-precision and rapid tightening device and method to solve the problem that the current method of installing and tightening high-torque fasteners using a combination of multiple tools results in complicated operation and high labor intensity.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following solution: On the one hand, this application provides a high-precision, rapid tightening device, including a vertically arranged tightening rod, and a primary pre-tightening mechanism and a secondary fine-tightening mechanism for driving the tightening rod to rotate along its axis, wherein: The bottom end of the tightening rod is a tightening end for connecting fasteners, and the top end is a transmission end with a sharp edge; The first-stage pre-tightening mechanism is located at the top of the transmission end, and its output end is connected to the transmission end and rotates synchronously with it; The secondary fine-tightening mechanism includes a fine-tightening drive arranged laterally and located around the tightening rod, and a fine-tightening transmission assembly mounted on the tightening rod; The output end of the precision twisting transmission component is mounted on the transmission end and rotates synchronously with it, while its input end is connected to the power output end of the precision twisting drive.

[0007] The design concept of this application is as follows: by integrating a primary pre-tightening mechanism and a secondary fine-tightening mechanism into the same device, and with the power output ends of both the primary pre-tightening mechanism and the secondary fine-tightening mechanism connected to the transmission end of the tightening rod, this device can quickly pre-tighten high-torque fasteners using the primary pre-tightening mechanism and then tighten them with high precision using the secondary fine-tightening mechanism. This combination of high precision and speed is achieved when tightening high-torque fasteners.

[0008] In the design of the layout of the primary pre-tightening mechanism and the secondary fine-tightening mechanism, both the primary pre-tightening mechanism and the secondary fine-tightening mechanism are arranged around the tightening rod, and are located at the top and periphery of the tightening rod, respectively. This not only conforms to the power output characteristics of the primary pre-tightening mechanism and the secondary fine-tightening mechanism, but also makes the overall spatial layout of the device compact, the center of gravity position reasonable, and convenient for the operator to carry and use.

[0009] Optionally, the fine-tightening drive is a linear hydraulic drive, and the fine-tightening drive includes: The cylinder barrel and the piston rod disposed inside the cylinder barrel, and the drive gear sleeve fixed on the piston rod. The cylinder barrel is disposed inside the drive gear sleeve and is slidably connected to it along the piston rod axis. The drive gear sleeve has several rows of teeth on the side facing the precision turning transmission assembly. The periphery of the precision turning transmission assembly has several circumferential teeth that mesh with the rows of teeth.

[0010] Optionally, the outer peripheral wall of the cylinder barrel is provided with a guide protrusion, which is arranged parallel to the axis of the cylinder barrel; The drive sleeve is provided with a limiting guide groove that matches the shape of the guide protrusion, and the guide protrusion and the limiting guide groove are slidably connected.

[0011] Optionally, the cylinder barrel is provided with a first oil inlet and a second oil inlet that are connected to an external oil circuit, and the first oil inlet and the second oil inlet are respectively located near the two ends inside the cylinder barrel; The cylinder barrel is provided with a cylinder barrel end cover that is detachably and sealingly connected to it, and the second oil inlet is located near the cylinder barrel end cover; The piston rod is provided with a piston head at one end near the cylinder end cover, and an oil inlet step is provided on the end face of the piston head near the cylinder end cover.

[0012] Optionally, the precision screwing drive also includes a guide ring fitted on the piston rod and a retaining ring for limiting the movement of the guide ring, both the guide ring and the retaining ring being located at the end of the piston rod away from the piston head; It also includes a gear sleeve protective shell located on one side of the fine-tightening drive output end and fixedly connected to the fine-tightening drive, and the gear sleeve protective shell is provided with a protective cavity for accommodating the reciprocating movement of the drive gear sleeve. It also includes a proximity switch or displacement sensor for detecting the position of the piston head, with both the displacement sensor and the proximity switch mounted on the gear sleeve protective housing.

[0013] Optionally, the precision tightening transmission assembly includes a reversing ratchet and a transmission ratchet, as well as a bearing for mounting the reversing ratchet, wherein: The reversing ratchet has several circumferential teeth on its periphery that are connected to the power output end of the precision screwing drive, and several lower ratchet teeth on its top. The bottom of the transmission ratchet is provided with several upper ratchet teeth that mesh with the lower ratchet teeth. The transmission ratchet is provided with a ridge head mounting hole for installing the transmission end. The transmission ratchet is installed on the transmission end of the tightening rod and is slidably connected to it along the axial direction of the tightening rod.

[0014] Optionally, the top of the transmission ratchet is provided with a preload spring mounting step, and a preload spring is installed between the preload spring mounting step and the bottom of the first-stage pre-tightening mechanism.

[0015] Optionally, it also includes an operating handle, which is equipped with a start button; The control handle has independent wiring channels and air channels, and the start button is connected to an external cable connector through the wiring channels. The first-stage pre-tightening mechanism is a pneumatic wrench tightening mechanism. The air inlet of the pneumatic wrench tightening mechanism is located at its top and is connected to the external air passage through the air passage of the operating handle. Its output end is located at the bottom and is inserted into the transmission end.

[0016] Optionally, it also includes a reaction force assembly located below the secondary fine tightening mechanism. The reaction force assembly includes a reaction arm mounting seat fitted on the tightening rod and a reaction arm mounted on the reaction arm mounting seat. The reaction arm is slidably connected to the reaction arm mounting seat along the axial direction of the tightening rod. The outer peripheral wall of the reaction arm mounting seat is provided with a rotation limiting structure for limiting the circumferential rotation of the reaction arm. The bottom surface of the reaction arm is horizontally positioned and located below the bottom surface of the tightening rod.

[0017] Optionally, a torque sensor is also included, mounted on the tightening rod, with its signal input located at its bottom and the bottom of the torque sensor fixedly connected to the top of the reaction arm mount.

[0018] Another aspect of this application provides a tightening method for a high-precision, rapid tightening device, adaptable to any of the high-precision, rapid tightening devices described above, specifically including the following steps: Step S1: Install the tightening end of the tightening rod onto the fastener to be tightened. Step S2: Start the first-stage pre-tightening mechanism. The first-stage pre-tightening mechanism drives the tightening rod to rotate along its axis, so that the tightening rod performs a rapid tightening action on the fastener. Step S3: The torque sensor monitors the torque of the rapid twisting action and determines whether the torque reaches the torque setting range of the rapid twisting. If not, proceed to S2; if yes, proceed to S4. Step S4: Start the secondary pre-tightening mechanism. The secondary pre-tightening mechanism drives the tightening rod to rotate along its axis through several cycles of pushing action, so that the tightening rod performs a high-precision tightening action on the fastener. Step S5: Based on the data monitoring results of the proximity switch or displacement sensor, and / or the data monitoring results of the torque sensor, determine individually or jointly whether the torque of the high-precision tightening action reaches the torque setting range of the rapid tightening. If not, proceed to S4; if yes, the tightening process of a single fastener ends.

[0019] The beneficial effects of this invention are: I. This application integrates a primary pre-tightening mechanism and a secondary fine-tightening mechanism into the same device, with the power output ends of both mechanisms connected to the transmission end of the tightening rod. This allows the device to perform rapid pre-tightening using the primary pre-tightening mechanism and high-precision tightening using the secondary fine-tightening mechanism when installing and tightening high-torque fasteners. This combination of high precision and speed is advantageous when tightening high-torque fasteners.

[0020] Second, this application designs the position layout by setting both the primary pre-tightening mechanism and the secondary fine-tightening mechanism around the tightening rod, and arranges the primary pre-tightening mechanism and the secondary fine-tightening mechanism on the top and the periphery of the tightening rod, respectively. This not only meets the power output characteristics of the primary pre-tightening mechanism and the secondary fine-tightening mechanism, but also makes the overall spatial layout of the device compact, the center of gravity position reasonable, and convenient for the operator to carry and use.

[0021] Third, by incorporating a reaction force component and a torque sensor, the device can prevent rotation during high-torque tightening by relying on the reaction force component. Simultaneously, the torque sensor, with its sleeve-shaped design and signal input at its bottom, can accurately detect torque while the reaction force component prevents the device from twisting. This provides reliable pre-load data support for the high-precision tightening of the secondary precision tightening mechanism. In particular, the torque sensor can collect continuous torque data throughout the entire tightening process of high-torque fasteners, avoiding the problems of discontinuous torque monitoring caused by using multiple tools or the characteristics of the tightening tools themselves, which could hinder the achievement of high-precision installation requirements. Attached Figure Description

[0022] Figure 1This is a three-dimensional exploded structure diagram of Embodiment 1 of this application.

[0023] Figure 2 This is a three-dimensional structural diagram of Embodiment 1 of this application.

[0024] Figure 3 This is a three-dimensional structural diagram of Embodiment 1 of this application after removing the housing assembly.

[0025] Figure 4 This is a top view of Embodiment 1 of this application.

[0026] Figure 5 This is a schematic diagram of the longitudinal section structure of Embodiment 1 of this application.

[0027] Figure 6 This is a schematic diagram of the cross-sectional structure of Embodiment 1 of this application.

[0028] Figure 7 This is a cross-sectional view of the operating handle in Embodiment 1 of this application.

[0029] Explanation of reference numerals in the attached figures: 1-Pneumatic wrench tightening mechanism, 2-Tightening rod, 201-Transmission ridge head, 202-Tightening end head, 3-Fine tightening drive, 31-Cylinder barrel, 311-Guide protrusion, 312-First oil inlet, 313-Second oil inlet, 32-Piston rod, 321-Piston head, 322-Oil inlet step, 33-Guide ring, 34-Snap ring, 35-Cylinder barrel end cover, 36-Drive gear sleeve, 361-Inline teeth, 362-Limiting guide groove, 4-Fine tightening transmission assembly, 41-Bearing, 42-Reversing ratchet, 421- Circumferential tooth, 422-lower ratchet, 43-transmission ratchet component, 431-edge mounting hole, 432-upper ratchet, 433-preload mounting step, 5-torque sensor, 6-reaction force assembly, 61-reaction force arm, 62-reaction arm mounting seat, 7-housing assembly, 71-lower housing, 72-upper housing, 73-sensor housing, 74-top cover, 75-tooth sleeve protective shell, 751-protective cavity, 8-operating handle, 81-start button, 82-air passage, 83-wire passage, 9-proximity switch. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "longitudinal," "lateral," "horizontal," "inner," "outer," "front," "rear," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "connect" 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.

[0033] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] Example 1: like Figures 1 to 7 As shown, this embodiment provides a high-precision, rapid tightening device, including a vertically arranged tightening rod 2, and a primary pre-tightening mechanism and a secondary fine-tightening mechanism for driving the tightening rod 2 to rotate along its axis, wherein: The bottom end of the tightening rod 2 is a tightening end 202 for connecting fasteners, and the top end is a transmission end with a ridge. The first-stage pre-tightening mechanism is located at the top of the transmission end, and its output end is connected to the transmission end and rotates synchronously with it; The secondary fine tightening mechanism includes a fine tightening drive 3 arranged laterally and located around the tightening rod 2, and a fine tightening transmission assembly 4 mounted on the tightening rod 2; The output end of the fine-tightening transmission assembly 4 is mounted on the transmission end and rotates synchronously with it, while its input end is connected to the power output end of the fine-tightening drive 3.

[0035] The design concept of this embodiment is as follows: by integrating the primary pre-tightening mechanism and the secondary fine-tightening mechanism into the same device, and with the power output ends of both the primary pre-tightening mechanism and the secondary fine-tightening mechanism connected to the transmission end of the tightening rod 2, this device can quickly pre-tighten high-torque fasteners using the primary pre-tightening mechanism and then tighten them with high precision using the secondary fine-tightening mechanism. When tightening high-torque fasteners, it has the advantages of both high precision and speed.

[0036] In the design of the position layout of the primary pre-tightening mechanism and the secondary fine-tightening mechanism, both the primary pre-tightening mechanism and the secondary fine-tightening mechanism are set around the tightening rod 2, and are located at the top and periphery of the tightening rod 2 respectively. This not only meets the power output characteristics of the primary pre-tightening mechanism and the secondary fine-tightening mechanism, but also makes the spatial layout of the device compact, the center of gravity position reasonable, and convenient for the operator to carry and use.

[0037] In this embodiment, as Figure 1 , Figure 3 as well as Figure 6 As shown, the fine-tightening drive 3 is a linear hydraulic drive, and the fine-tightening drive 3 includes: The cylinder 31 and the piston rod 32 disposed inside the cylinder 31, and the drive gear sleeve 36 fixed on the piston rod 32. The cylinder 31 is disposed inside the drive gear sleeve 36 and is slidably connected to the piston rod 32 along the axis of the piston rod 32. The drive gear sleeve 36 is provided with a plurality of straight teeth 361 on the side facing the precision turning transmission assembly 4. The periphery of the precision turning transmission assembly 4 is provided with a plurality of circumferential teeth 421 that mesh with the straight teeth 361.

[0038] By setting a linear hydraulic drive, the size of the mechanism can be minimized while ensuring sufficient thrust, avoiding excessive bulkiness and the problem of excessive center of gravity shift of the tightening rod 2, making it convenient for operators to carry and use. Those skilled in the art can also set other power-driven linear drive structures as needed, such as a high-thrust electric push cylinder, or replace the entire fine-tightening drive 3 with a motor-driven worm gear, and replace the circumferential gear 421 of the fine-tightening transmission assembly 4 with a worm wheel gear that meshes with the worm. Within the conceptual path of this application, those skilled in the art can choose a linear drive structure according to their own needs, which will not be elaborated further here.

[0039] In some embodiments, two or more fine-tightening drives 3 can be provided to simultaneously drive the reversing ratchet 42 of the fine-tightening transmission assembly 4, which can increase the torque of the fine-tightening transmission assembly 4, increase the compatibility range of high-torque fasteners that the equipment can be adapted to, and improve the adaptability of the equipment. When two or more fine-tightening drives 3 are provided, both or more fine-tightening drives 3 are arranged circumferentially along the reversing ratchet 42.

[0040] In this embodiment, as Figure 5 As shown, the outer peripheral wall of the cylinder barrel 31 is provided with a guide protrusion 311, which is parallel to the axis of the cylinder barrel 31. The drive sleeve 36 is provided with a limiting guide groove 362 that matches the shape of the guide protrusion 311, and the guide protrusion 311 is slidably connected to the limiting guide groove 362. In this embodiment, there are two guide protrusions 311 on the outer peripheral arm of the cylinder barrel 31. The guide protrusions 311 are designed to prevent torque from occurring when the piston rod 32 in the cylinder barrel 31 pushes the drive sleeve 36, which could lead to uneven force or even tooth breakage during the meshing of the straight teeth 361 and the circumferential teeth 421 of the drive sleeve 36. In this embodiment, the guide protrusion 311 is elongated. Technicians can design guide protrusions 311 of other shapes as needed, which will not be described in detail here.

[0041] In this embodiment, as Figure 6 As shown, the cylinder barrel 31 is provided with a first oil inlet 312 and a second oil inlet 313 that are connected to the external oil circuit. The first oil inlet 312 and the second oil inlet 313 are respectively located near the two ends inside the cylinder barrel 31. The cylinder barrel 31 is provided with a cylinder barrel end cover 35 that is detachably and sealingly connected to it, and the second oil inlet 313 is located near the cylinder barrel end cover 35. A piston head 321 is provided at the end of the piston rod 32 near the cylinder end cover 35. An oil inlet step 322 is provided on the end face of the piston head 321 near the cylinder end cover 35. When an external hydraulic system supplies oil to the second oil inlet 313, the hydraulic oil enters the oil inlet step 322 and continuously pushes the piston head 321 towards the first oil inlet 312. Conversely, when the external hydraulic system supplies oil to the first oil inlet 312, the hydraulic oil pushes the piston head 321 back to its original position until it is close to the cylinder end cover 35. In this embodiment, the cylinder end cover 35 is threadedly connected to the cylinder barrel 31.

[0042] In this embodiment, as Figure 6 As shown, the precision screwing drive 3 also includes a guide ring 33 fitted on the piston rod 32, and a retaining ring 34 for limiting the movement of the guide ring 33. Both the guide ring 33 and the retaining ring 34 are located at the end of the piston rod 32 away from the piston head 321. It also includes a gear sleeve protective shell 75 located on one side of the output end of the fine screwing drive 3 and fixedly connected to the fine screwing drive 3. The gear sleeve protective shell 75 is provided with a protective cavity 751 for accommodating the reciprocating movement of the drive gear sleeve 36. It also includes a proximity switch 9 or a displacement sensor for detecting the position of the piston head 321. Both the displacement sensor and the proximity switch 9 are mounted on the gear sleeve protective housing 75. In this embodiment, the guide ring 33 can accurately guide the piston rod 32 to minimize wear between the piston rod 32 and the cylinder 31, thereby reducing the sealing performance. In this embodiment, the guide ring 33 is made of copper, which is readily available and has good wear resistance. Those skilled in the art can replace it with other wear-resistant alloy or ceramic materials as needed, which will not be described in detail here.

[0043] In this embodiment, the protective shell 75 for the gear sleeve prevents the moving parts of the device from being exposed during use, thus avoiding safety hazards. Furthermore, the proximity switch 9 detects the position of the piston head 321, and combined with the hydraulic oil pressure detection of the hydraulic system, the torque driving the tightening rod 2 of the secondary precision tightening mechanism can be calculated. In some embodiments that do not use the torque sensor 5, the proximity switch 9, in conjunction with the hydraulic oil pressure detection of the hydraulic system, can achieve torque accuracy control with a higher precision than existing technologies.

[0044] In some embodiments, those skilled in the art can replace the proximity switch 9 with a displacement sensor as needed. Based on the real-time position monitoring results of the piston head 321 by the displacement sensor, the moving position of the drive sleeve 36 can be obtained. Then, based on the size data of the reversing ratchet 42, the rotation angle data of the reversing ratchet 42 can be obtained in real time. Torque data can be obtained based on the rotation angle data and the hydraulic oil data monitored by the external hydraulic pump station. Compared to the proximity switch 9, using a displacement sensor provides more real-time and accurate torque data.

[0045] In this embodiment, the precision tightening transmission assembly 4 includes a reversing ratchet 42 and a transmission ratchet 43, as well as a bearing 41 for mounting the reversing ratchet 42, wherein: The circumference of the reversing ratchet 42 is provided with several circumferential teeth 421 that are connected to the power output end of the precision screwing drive 3, and the top of the reversing ratchet 42 is provided with several lower ratchet teeth 422. The bottom of the transmission ratchet 43 is provided with several upper ratchet teeth 432 that mesh with the lower ratchet teeth 422. The transmission ratchet 43 is provided with a ridge head mounting hole 431 for mounting the transmission end. The transmission ratchet 43 is mounted on the transmission end of the tightening rod 2 and is slidably connected to it along the axial direction of the tightening rod 2.

[0046] In this embodiment, as Figure 5As shown, the top of the transmission ratchet 43 is provided with a preload spring mounting step, and a preload spring (not shown in the figure) is installed between the preload spring mounting step and the bottom of the first-stage pre-tightening mechanism. By setting the preload spring, after the second-stage fine-tightening mechanism is reset, the preload spring can be used to quickly press the transmission ratchet 43 against the top of the reversing ratchet 42 to complete the engagement, thus avoiding the problem of tooth breakage.

[0047] In this embodiment, as Figure 1 and Figure 7 As shown, it also includes an operating handle 8, on which a start button 81 is provided; The operating handle 8 has independent wiring channels 83 and air channels 82. The start button 81 is connected to an external cable connector through the wiring channel 83. The primary pre-tightening mechanism is a pneumatic wrench tightening mechanism 1. The air inlet of the pneumatic wrench tightening mechanism 1 is located at its top and is connected to the external air passage through the air passage 82 of the operating handle 8. Its output end is located at the bottom and is inserted into the transmission end. The wiring channel 83 and air passage 82 inside the operating handle 8 can avoid the problem of messy wiring, make full use of the space of the device, reduce the size of the device, and at the same time, the structure of the operating handle 8 itself can provide a certain degree of protection for the wiring channel 83 and air passage 82.

[0048] Those skilled in the art can replace the air wrench tightening mechanism 1 with other types of rotary drive mechanisms as needed, such as an inverted drive motor, which can be coaxially and fixedly connected to the end of the tightening rod 2. Those skilled in the art can also replace the air wrench tightening mechanism 1 with other types of rotary drive mechanisms, which will not be elaborated here.

[0049] Specifically, such as Figures 1 to 3 As shown, in this embodiment, a reaction force assembly 6 located below the secondary fine tightening mechanism is also included. The reaction force assembly 6 includes a reaction arm mounting seat 62 fitted on the tightening rod 2 and a reaction arm 61 mounted on the reaction arm mounting seat 62. The reaction arm 61 is slidably connected to the reaction arm mounting seat 62 along the axial direction of the tightening rod 2. A rotation limiting structure for limiting the circumferential rotation of the reaction arm 61 is provided on the outer peripheral wall of the reaction arm mounting seat 62. The bottom surface of the reaction arm 61 is horizontally positioned and located below the bottom surface of the tightening rod 2. In this embodiment, the rotation-limiting structure consists of several strip-shaped protrusions parallel to the axis of the reaction arm mounting base 62. The reaction arm 61 and the reaction arm mounting base 62 are slidably connected axially, allowing the reaction arm 61 to be replaced as needed. For example, when installing high-torque fasteners of different sizes and models, a conversion sleeve is first installed on the tightening end 202 of the tightening rod 2, and then the appropriate reaction arm 61 is installed as needed.

[0050] In this embodiment, as Figure 1 As shown, the reaction arm 61 is Z-shaped, and its top is fitted onto the reaction arm mounting base 62. By setting the reaction arm 61, a certain reaction force can be provided to the operator when tightening high-torque fasteners, so as to prevent the device from reversing when tightening the fasteners.

[0051] In this embodiment, as Figure 1 and Figure 3 As shown, it also includes a torque sensor 5 mounted on the tightening rod 2. The signal input end of the torque sensor 5 is located at its bottom, and the bottom of the torque sensor 5 is fixedly connected to the top of the reaction arm mounting base 62. In this embodiment, the torque sensor 5 is cylindrical in shape, mounted on the tightening rod 2 without contacting it. Its signal output end is fixedly connected to the top of the reaction arm mounting base 62, and the signal input end of the torque sensor 5 is located at its top and connected to an external controller via a cable connected to the operating handle 8.

[0052] The torque sensor 5 is fitted with a sensor housing 73, which is shaped like an inverted frustum. The wiring between the signal input terminal of the torque sensor 5 and the cable connected to the operating handle 8 can pass through the lower housing 71 and the gear sleeve protective housing 75 to avoid messy wiring. Under the concept of this embodiment, those skilled in the art can also choose other types of torque sensors 5 as needed, which will not be described in detail here.

[0053] Example 2: This embodiment provides a tightening method for a high-precision, rapid tightening device, adapted to the high-precision, rapid tightening device for lithium i1 described above, and specifically includes the following steps: Step S1: Install the tightening end 202 of the tightening rod 2 onto the fastener to be tightened. Step S2: Start the first-stage pre-tightening mechanism. The first-stage pre-tightening mechanism drives the tightening rod 2 to rotate along its axis, so that the tightening rod 2 performs a rapid tightening action on the fastener. Step S3: The torque sensor 5 monitors the torque of the rapid twisting action and determines whether the torque reaches the torque setting range of the rapid twisting. If not, proceed to S2; if yes, proceed to S4. Step S4: Start the secondary pre-tightening mechanism. The secondary pre-tightening mechanism drives the tightening rod 2 to rotate along its axis through several cycles of pushing action, so that the tightening rod 2 performs a high-precision tightening action on the fastener. Step S5: Based on the data monitoring results of proximity switch 9 or displacement sensor, and / or torque sensor 5, determine individually or jointly whether the torque of the high-precision tightening action reaches the torque setting range of rapid tightening. If not, proceed to S4; if yes, the tightening process of a single fastener ends.

[0054] In this embodiment, the torque can be jointly determined based on the data collected by the torque sensor 5 and the proximity switch 9. Under the joint determination, the position of the piston rod 32 is monitored by the proximity switch 9. When the piston rod 32 reaches the farthest position, the external hydraulic pump station can determine whether the torque meets the requirements based on the hydraulic oil pressure. If the requirements are not met, the next cycle of pushing action is performed. If the torque requirements are met, the data monitored by the torque sensor 5 can be used for verification, forming a double mutual verification to avoid misjudgment of torque accuracy.

[0055] In some embodiments, the torque can be jointly determined based on the data collected by the torque sensor 5 and the displacement sensor. In this joint determination, the position of the piston rod 32 is monitored in real time by the displacement sensor, and the rotation angle data of the reversing ratchet 42 is obtained in real time based on the size data of the reversing ratchet 42. The torque data can then be obtained based on the rotation angle data and the hydraulic oil data monitored by the external hydraulic pump station. When the piston rod 32 reaches its farthest position, it is determined whether the torque meets the requirements. If not, the next cycle of pushing action is performed. If the torque requirement is met, the data monitored by the torque sensor 5 can be used for verification, forming a double mutual verification to avoid misjudgment of torque accuracy.

[0056] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A high-precision, high-speed tightening device, characterized in that, It includes a vertically arranged tightening rod (2), and a primary pre-tightening mechanism and a secondary fine-tightening mechanism for driving the tightening rod (2) to rotate along its axis, wherein: The bottom end of the tightening rod (2) is a tightening end (202) for connecting fasteners, and the top end is a transmission end with a ridge. The first-stage pre-tightening mechanism is located at the top of the transmission end, and its output end is connected to the transmission end and rotates synchronously with it; The secondary fine-tightening mechanism includes a fine-tightening drive (3) arranged laterally and located around the tightening rod (2), and a fine-tightening transmission assembly (4) mounted on the tightening rod (2). The output end of the fine-tightening transmission assembly (4) is mounted on the transmission end and rotates synchronously with it, while its input end is connected to the power output end of the fine-tightening drive (3). The precision screwing drive (3) is a linear hydraulic drive, and the precision screwing drive (3) includes: The cylinder (31) and the piston rod (32) are disposed in the cylinder (31), and the drive sleeve (36) is fixed on the piston rod (32). The cylinder (31) is disposed in the drive sleeve (36) and is slidably connected to the piston rod (32) along the axis of the piston rod (32). The drive sleeve (36) has a number of straight teeth (361) on the side facing the fine-tightening transmission assembly (4). The circumference of the fine-tightening transmission assembly (4) has a number of circumferential teeth (421) that mesh with the straight teeth (361). The precision screwing drive (3) also includes a guide ring (33) fitted on the piston rod (32) and a snap ring (34) for limiting the movement of the guide ring (33). The guide ring (33) and the snap ring (34) are both located at the end of the piston rod (32) away from the piston head (321). It also includes a gear sleeve protective shell (75) located on one side of the output end of the fine screwing drive (3) and fixedly connected to the fine screwing drive (3), and a protective cavity (751) for accommodating the reciprocating movement of the drive gear sleeve (36) is provided inside the gear sleeve protective shell (75). It also includes a proximity switch (9) or displacement sensor for detecting the position of the piston head (321), and the displacement sensor and proximity switch (9) are both mounted on the gear sleeve protective housing (75); The precision-tuning transmission assembly (4) includes a reversing ratchet (42) and a transmission ratchet (43), and a bearing (41) for mounting the reversing ratchet (42), wherein: The circumference of the reversing ratchet (42) is provided with several circumferential teeth (421) that are connected to the power output end of the precision screwing drive (3), and the top of the reversing ratchet (42) is provided with several lower ratchet teeth (422). The bottom of the transmission ratchet (43) is provided with several upper ratchet teeth (432) that mesh with the lower ratchet teeth (422). The transmission ratchet (43) is provided with a ridge head mounting hole (431) for installing the transmission end. The transmission ratchet (43) is installed on the transmission end of the tightening rod (2) and is slidably connected to it along the axial direction of the tightening rod (2). The top of the transmission ratchet (43) is provided with a preload spring mounting step, and a preload spring is installed between the preload spring mounting step and the bottom of the first-stage pre-tightening mechanism; It also includes a torque sensor (5) mounted on the tightening rod (2), with the signal input end of the torque sensor (5) located at its bottom, and the bottom of the torque sensor (5) being fixedly connected to the top of the reaction arm mounting base (62).

2. The high-precision, rapid tightening device according to claim 1, characterized in that, The outer peripheral wall of the cylinder barrel (31) is provided with a guide protrusion (311), which is parallel to the axis of the cylinder barrel (31). The drive sleeve (36) is provided with a limiting guide groove (362) that matches the shape of the guide protrusion (311), and the guide protrusion (311) and the limiting guide groove (362) are slidably connected.

3. The high-precision, rapid tightening device according to claim 1, characterized in that, The cylinder barrel (31) is provided with a first oil inlet (312) and a second oil inlet (313) that are connected to the external oil circuit. The first oil inlet (312) and the second oil inlet (313) are respectively located near the two ends inside the cylinder barrel (31). The cylinder barrel (31) is provided with a cylinder barrel end cap (35) which is detachably and sealingly connected to it, and the second oil inlet (313) is provided near the cylinder barrel end cap (35); The piston rod (32) is provided with a piston head (321) at one end near the cylinder end cover (35), and an oil inlet step (322) is provided on the end face of the piston head (321) near the cylinder end cover (35).

4. The high-precision, rapid tightening device according to claim 1, characterized in that, It also includes an operating handle (8), on which a start button (81) is provided; The operating handle (8) is provided with independent wiring channels (83) and air channels (82), and the start button (81) is connected to an external cable connector through the wiring channel (83); The first-level pre-tightening mechanism is a pneumatic wrench tightening mechanism (1). The air inlet of the pneumatic wrench tightening mechanism (1) is located at its top and is connected to the external air passage through the air passage (82) of the operating handle (8). Its output end is located at the bottom and is inserted into the transmission end.

5. The high-precision, rapid tightening device according to claim 1, characterized in that, It also includes a reaction force assembly (6) located below the secondary fine tightening mechanism. The reaction force assembly (6) includes a reaction arm mounting seat (62) fitted on the tightening rod (2) and a reaction arm (61) mounted on the reaction arm mounting seat (62). The reaction arm (61) is slidably connected to the reaction arm mounting seat (62) along the axial direction of the tightening rod (2). The outer peripheral wall of the reaction arm mounting seat (62) is provided with a rotation limiting structure for limiting the circumferential rotation of the reaction arm (61). The bottom surface of the reaction arm (61) is horizontally positioned and located below the bottom surface of the tightening rod (2).

6. A tightening method for a high-precision, rapid tightening device, adaptable to the high-precision, rapid tightening device according to any one of claims 1-5, characterized in that, Specifically, the following steps are included: Step S1: Install the tightening end (202) of the tightening rod (2) onto the fastener to be tightened. Step S2: Start the first-stage pre-tightening mechanism. The first-stage pre-tightening mechanism drives the tightening rod (2) to rotate along its axis, so that the tightening rod (2) performs a rapid tightening action on the fastener. Step S3: The torque sensor (5) monitors the torque of the rapid twisting action and determines whether the torque reaches the torque setting range of the rapid twisting. If not, it proceeds to S2; if so, it proceeds to S4. Step S4: Start the secondary pre-tightening mechanism. The secondary pre-tightening mechanism drives the tightening rod (2) to rotate along its axis through several cycles of pushing action, so that the tightening rod (2) performs high-precision tightening action on the fastener. Step S5: Based on the data monitoring results of the proximity switch (9) or displacement sensor, or / and the data monitoring results of the torque sensor (5), determine individually or jointly whether the torque of the high-precision tightening action reaches the torque setting range of the rapid tightening. If not, proceed to S4; if yes, the tightening process of a single fastener ends.

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