CN110640448B - Installation type double-shaft automatic tightening device and operation method thereof - Google Patents

Installation type double-shaft automatic tightening device and operation method thereof Download PDF

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Publication number
CN110640448B
CN110640448B CN201910974376.5A CN201910974376A CN110640448B CN 110640448 B CN110640448 B CN 110640448B CN 201910974376 A CN201910974376 A CN 201910974376A CN 110640448 B CN110640448 B CN 110640448B
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Prior art keywords
tightening
shaft
sleeve
supporting seat
support
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CN110640448A (en
Inventor
赵延治
余发国
韩龙光
贺勇
付玉行
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Yanshan University
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Yanshan University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/04Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
    • B23P19/06Screw or nut setting or loosening machines
    • B23P19/069Multi-spindle machines

Abstract

The invention discloses an installation type double-shaft automatic tightening device which comprises a driving support, a front support seat, a rear support seat, a switch support, a servo motor, a speed reducer, a gear unit, tightening shafts, a cylinder and a fixed seat. The invention provides an installation type double-shaft automatic screwing device which is suitable for being applied to small space and small distance between two shafts.

Description

Installation type double-shaft automatic tightening device and operation method thereof
Technical Field
The invention relates to a bolt tightening device, in particular to an installation type double-shaft automatic tightening device and an operation method thereof.
Background
At present, the bolt is screwed up mainly manually, and the screwing up manually has large workload and uncontrollable screwing force. At present, most of the existing screwing products are handheld, and the screwing wrench needs to be held by a worker to work and is not suitable for automation equipment. In addition, when automatic installation operation is carried out, a plurality of bolts are often screwed, the screwing efficiency of a single shaft is low, and the distance between two screwing shafts in part of places is small, so that two screws cannot be screwed simultaneously.
Patent CN200820164166.7 discloses a screw tightening device, which includes a frame of pneumatic element, electric element and programmable controller, a clamp for fixing a workpiece, a magazine for storing screws, an electric control box and a feeding device are arranged on a panel of the frame, a pneumatic screwdriver is arranged on the feeding device, and the pneumatic screwdriver is connected with the pneumatic element and connected with the programmable controller through a wire. But it has certain disadvantages mainly represented by: the torque force of the pneumatic screwdriver generated by air compression is inconsistent, so that the tightening force of the fastener is inconsistent, and the problem of too high or too low is caused.
Patent CN201510403004.9 discloses a screw mounting device with accurate quantitative control, which comprises a workbench, a screw tightening device and a controller, wherein the workbench is provided with a product clamp, the product clamp is connected with a torque sensor, the screw tightening device comprises a servo motor, a speed reducer and a screw sleeve, and handles are mounted on two sides of the speed reducer; the controller comprises a display unit, a control unit, an analog conversion unit, a servo driver and a starting switch. The defects are shown as follows: the structure is complex and the cost is high; the torque control is controlled by a servo motor and a torque sensor, and no part for cutting off input power in an overload way is arranged between the screw sleeve and the screw, so that the reliability is not high.
The invention discloses a tightening device with adjustable torque of a fastener and a tightening force control method, and the tightening device with adjustable torque of the fastener comprises a bottom frame, a cylinder, a sliding guide rail and a PLC, wherein the cylinder, the sliding guide rail and the PLC are arranged on the bottom frame; the movable support is provided with a tightening mechanism, and the tightening mechanism is connected with a tightening tool through a torque limiter; the tightening mechanism is an electric motor or a pneumatic motor, and a pressure regulating valve is arranged on a gas path connected with the pneumatic motor; the lower part of the underframe is provided with an in-place switch and a tightening switch; the torque limiter is a steel ball type torque limiter, a microswitch is arranged on the steel ball type torque limiter, and the microswitch is connected with the PLC. The disadvantages are that: the screwing device has more motors and is relatively complicated to control.
Disclosure of Invention
Aiming at the technical problems, the invention provides an installation type double-shaft linkage tightening device with simple structure, high reliability, high efficiency and low cost, and in order to realize the purpose, the invention adopts the following technical scheme:
in particular to an installation type double-shaft automatic tightening device which comprises a driving bracket, a front supporting seat, a rear supporting seat, a switch bracket, a servo motor, a speed reducer, a gear unit, a tightening shaft, a cylinder and a fixed seat,
the driving support is installed by means of a fixing frame, a first end of the driving support is fixedly connected with a front supporting seat, a second end of the driving support is fixedly connected with a rear supporting seat, the rear supporting seat is located below the driving support, a switch support is located in front of the front supporting seat, the switch support is used for installing a proximity switch, the driving support, the front supporting seat, the rear supporting seat and the switch support are all arranged below two tightening shafts, a torque detector is arranged outside the tightening shafts, when the torque of the tightening shafts reaches a preset value, the torque detector deforms, and the proximity switch is configured to detect the deformation signal and send the deformation signal to a control unit,
the cylinder is installed by means of a cylinder block, the cylinder block is fixed at the bottom of the front supporting seat, one end of a piston of the cylinder is rotatably connected with the cylinder block, one end of a cylinder body of the cylinder is fixed on a fixing frame, an output shaft of the servo motor is connected with the speed reducer, the speed reducer is fixedly installed on the driving support,
the gear unit comprises a driving gear and two driven gears, the driving gear and the two driven gears are fixedly arranged on the driving bracket, the driving gear is connected with an output shaft of the speed reducer, the two driven gears are respectively meshed with the driving gear, the two driven gears are symmetrically arranged relative to the central plane of the driving gear,
each tightening shaft comprises a support shaft, a shaft end flange, a sleeve, a rectangular key, a bearing, a fastening nut, a through joint, an adapter, a piston, a disc spring, a pressing sleeve, a tightening sleeve and a transmission shaft, the bearing passes through two holes of a front support seat, a bearing cover of the bearing is fixed on the front support seat, the support shaft is connected with a driven gear through the rectangular key, one end of the sleeve is in contact with the gear, the other end of the sleeve is in contact with the bearing, one end of the through joint is in threaded connection with one end of the adapter, the other end of the adapter is in threaded connection with the tightening sleeve, the through joint and a center hole of the adapter are concentrically arranged,
the shaft end flange is fixedly connected with the pressing sleeve, a plurality of disc springs are arranged between the pressing sleeve and the fastening nut, the fastening nut is connected with the tightening sleeve,
the spring sleeve is arranged outside the piston, the inner end part of the transmission shaft penetrates through the tightening sleeve and is connected with the piston, the piston and the spring are integrally positioned inside the tightening sleeve, the piston can slide in a cavity channel of a center hole of the tightening sleeve, a center hole of the support shaft, a center hole of the through joint and the center of the adapter form an air source channel, and the center hole of the tightening sleeve is a sealed cavity channel.
Preferably, the outer side of the pressing sleeve is provided with a plurality of semicircular pits, the outer side of the screwing sleeve is provided with a plurality of tapered holes, a plurality of torque detectors are arranged between the semicircular pits and the tapered holes, the number of the semicircular pits, the number of the tapered holes and the number of the torque detectors are in one-to-one correspondence, each torque detector is a steel ball, the steel balls can rotate in the semicircular pits, and when a certain torque is achieved, the steel balls are separated from the semicircular pits.
Preferably, be provided with two guiding axles between preceding supporting seat and the back supporting seat, the both ends of two guiding axles are fixed respectively in the hole that preceding supporting seat and back supporting seat correspond to two guiding axles pass the fixing base respectively, the fixing base passes through bolted connection external mounting spare.
Preferably, the shaft end flange is connected with the pressing sleeve through a bolt, and the fastening nut is in threaded connection with the tightening sleeve.
Preferably, the outer end of the drive shaft is an internal hexagon wrench.
Preferably, a magnet is fixed to the outer end of the transmission shaft.
Preferably, the first end of the driving bracket is fixedly connected with the front supporting seat through a bolt, and the second end of the driving bracket is connected with the rear supporting seat through a bolt.
Preferably, the present invention also provides an operating method of the mounted type double-shaft automatic tightening device, which includes the steps of:
s1, the servo motor drives the main gear to mesh with the two driven gears;
s2, when the bolt needs to be screwed down, the magnet at the end of the transmission shaft attracts the bolt to be screwed down and enables the bolt to be screwed down to be horizontal, and in the screwing process, the air cylinder pushes the screwing device to move forwards;
s3, when the torque of a tightening shaft reaches a preset value, the torque detector generates a tiny deformation, the change signal is detected by the proximity switch, then the change signal is transmitted to the control center, the control center controls the servo motor to stop, the tightening section of the transmission shaft is bounced off by the spring action in the channel, and the tightening shaft is separated from the bolt;
and S4, the servo motor is continuously started, another bolt to be screwed is screwed until the proximity switch detects a change signal again, the two bolts finish the screwing work, and the air cylinder reversely acts to reset the screwing device.
Compared with the prior art, the invention has the following beneficial effects:
the invention can be applied to automatic equipment, can improve the working efficiency when the two tightening shafts are linked, and can provide larger tightening force for the servo motor.
The invention also has a device for setting the torque, and the preset torque can be adjusted by controlling the number of the disc springs, so that the bolts can achieve equal torque, and the strength of the whole equipment can be ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of a mounted dual spindle automatic tightening apparatus;
FIG. 2 is an exploded schematic view of a mounted dual spindle automatic tightening device;
FIG. 3 is an exploded view of a tightening shaft of a mounted dual shaft automatic tightening device; and
fig. 4 is a sectional view of a mounted-type biaxial automatic tightening device.
Wherein some of the reference numbers are as follows:
1-a servo motor, 2-a speed reducer, 3-a driving gear, 4-a driven gear, 5-a bearing, 6-a pressing sleeve, 7-a transmission shaft, 8-a magnet, 9-a hexagon socket screw, 10-a bearing cover, 11-a proximity switch, 12-a switch bracket, 13-a front support seat, 14-a driving bracket, 15-a fixed seat and 16-a cylinder seat, 17-pin shaft, 18-cylinder, 19-guide shaft, 20-rear support seat, 21-rectangular key, 22-support shaft, 23-sleeve, 24-shaft end flange, 25-piston, 26-adapter, 27-fastening nut, 28-disc spring, 29-steel ball, 30-spring, 31-tightening sleeve and 32-straight joint.
Detailed Description
Exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
Aiming at the technical problems, the invention provides the conveniently-installed double-shaft automatic tightening device which is simple in structure, high in reliability, high in efficiency and low in manufacturing cost
The specific embodiments of the present invention are as follows:
the invention provides an installation type double-shaft automatic tightening device, which comprises a support group, a servo motor 1, a speed reducer 2, a gear unit, tightening shafts, a guide shaft 19, a cylinder 18 and a fixed seat 15, wherein the support group comprises a driving support 14, a front support seat 13, a rear support seat 20 and a switch support 12, the front end of the driving support 14 is fixedly connected with the front support seat 13 through a bolt, the tail end of the driving support 14 is connected with the rear support seat 20 through a bolt, the rear support seat 20 is positioned below the driving support 14, the switch support 12 is positioned in front of the front support seat 13, the driving support 14, the front support seat 13, the rear support seat 20 and the switch support 12 are all arranged below the two tightening shafts, and the speed reducer 2 and the gear unit are all arranged on the driving support 14, as shown in figures 1 to 4.
Preferably, two guide shafts 19 are arranged between the front support base 13 and the rear support base 20, two ends of each guide shaft 19 are respectively fixed in corresponding holes of the front support base 13 and the rear support base 20, the two guide shafts 19 both penetrate through the fixed base 15, and the fixed base 15 is connected with other external installation components through bolts, so that the whole device is installed.
Preferably, the cylinder block 16 is fixed at the bottom of the front support base 13 by bolts, one end of the cylinder piston 25 is connected with the cylinder block 16 by a pin 17, the other end of the cylinder block is fixed on a fixed frame by bolts, the servo motor 1 and the speed reducer 2 are connected by bolts, and the speed reducer 2 is fixedly installed on the driving support 14 by bolts.
Preferably, the gear unit includes a driving gear 3 and two driven gears 4, the driving gear 3 is connected to the output shaft of the speed reducer 2, the two driven gears 4 are respectively engaged with the driving gear 3, and the two driven gears 4 are symmetrically arranged with respect to the central plane of the driving gear 3.
The bearings on the two tightening shafts pass through two holes of the front support base 13, the bearing cap 10 is fixed on the front support base 13 by bolts, and the bearing base positions the bearings on the tightening shafts.
Preferably, the tightening shaft includes a support shaft 22, a shaft end flange 24, a sleeve 23, a rectangular key 21, a bearing 5, a fastening nut 27, a through joint 32, an adapter 26, a piston 25, a disc spring 28, a spring 30, a pressing sleeve 6, a tightening sleeve 31, and a transmission shaft 7.
The supporting shaft 22 is connected with the driven gear 4 through a key, one end of the sleeve 23 is in contact with the driven gear 4, the other end of the sleeve 23 is in contact with the bearing 5, one end of the through joint 32 is in threaded connection with one end of the adapter 26, the other end of the adapter 26 is in threaded connection with the tightening sleeve 31, and the through joint 32 and a center hole of the adapter 26 are concentrically arranged.
Preferably, the shaft end flange 24 is connected with the pressing sleeve 6 through bolts, a plurality of disc springs 28 are placed between the pressing sleeve 6 and the nuts, and the fastening nuts 27 are connected with the tightening sleeve 31 through threads. When the torque of the tightening shaft needs to be adjusted, the adjustment can be performed by adjusting the number of the disc springs 28.
Preferably, the pressing sleeve 6 is provided with a plurality of semicircular pits on the outer side, the tightening sleeve 31 is provided with a plurality of conical holes on the outer side, steel balls 29 with the same number are placed between the semicircular pits and the conical holes, the steel balls 29 can rotate in the pits, when a certain torque is reached, the steel balls can be separated from the pits, and the proximity switch 11 can detect a change signal of the torque.
Preferably, the transmission shaft 7 is connected to the piston 25 through the tightening sleeve 31 and the spring 30, the piston 25 and the spring 30 being integrally located inside the tightening sleeve 31, and the piston 25 being slidable inside a channel in the central hole of the tightening sleeve. The central hole of the support shaft 22, the central hole of the through joint 32 and the central hole of the adapter 26 form an air supply channel, and the central hole of the tightening sleeve 31 is a sealed cavity channel.
Preferably, the end of the transmission shaft 7 is provided with an internal hexagon wrench, a magnet 8 is fixed on the end of the transmission shaft, and an internal hexagon bolt 9 is connected with the end of the transmission shaft.
Preferably, the switch bracket 12 is fixed to a front end surface of the front support base 13, and the proximity switch 11 is fixed to the switch bracket 12.
The specific implementation process of the invention is as follows:
the servo motor is connected with the speed reducer as a driving device, and the driving device is meshed with the two driven gears through the transmission force of the main gear. When the bolt needs to be screwed down, the magnet at the end part of the transmission shaft attracts the bolt to be screwed down, so that the bolt to be screwed down is kept horizontal.
During the tightening process, the whole device is pushed to move forwards by the air cylinder, when the torque of a certain tightening shaft reaches a preset value, a torque detector generates a slight deformation, the change can be detected by a proximity switch, a signal is transmitted to a control center, the control center controls a servo motor to stop, the transmission shaft of a tightening section is bounced off by the spring action in a channel, and the tightening shaft is separated from a bolt. The preset value can be set as required.
The servomotor then continues to be activated to tighten another bolt until the proximity switch again receives a signal indicating that both bolts have been tightened. The reverse action of the cylinder restores the tightening device.
Compared with the prior art, the invention has the following beneficial effects:
the invention can be applied to automatic equipment, can improve the working efficiency when the two tightening shafts are linked, and can provide larger tightening force for the servo motor.
The invention also has a device for setting the torque, and the preset torque can be adjusted by controlling the number of the disc springs, so that the bolts can achieve equal torque, and the strength of the whole equipment can be ensured.
Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (6)

1. The utility model provides an automatic device of screwing up of installation formula biax which characterized in that: which comprises a driving bracket, a front supporting seat, a rear supporting seat, a switch bracket, a servo motor, a speed reducer, a gear unit, a tightening shaft, a cylinder and a fixed seat,
the driving support is installed by means of a fixing frame, a first end of the driving support is fixedly connected with a front supporting seat, a second end of the driving support is fixedly connected with a rear supporting seat, the rear supporting seat is located below the driving support, a switch support is located in front of the front supporting seat, the switch support is used for installing a proximity switch, the driving support, the front supporting seat, the rear supporting seat and the switch support are all arranged below two tightening shafts, a torque detector is arranged outside the tightening shafts, when the torque of the tightening shafts reaches a preset value, the torque detector deforms, and the proximity switch is configured to detect a signal of the deformation and send the signal of the deformation to a control unit,
the cylinder is installed by means of a cylinder block, the cylinder block is fixed at the bottom of the front supporting seat, one end of a piston of the cylinder is rotatably connected with the cylinder block, one end of a cylinder body of the cylinder is fixed on a fixing frame, an output shaft of the servo motor is connected with the speed reducer, the speed reducer is fixedly installed on the driving support,
the gear unit comprises a driving gear and two driven gears, the driving gear and the two driven gears are fixedly arranged on the driving bracket, the driving gear is connected with an output shaft of the speed reducer, the two driven gears are respectively meshed with the driving gear, the two driven gears are symmetrically arranged relative to the central plane of the driving gear,
each tightening shaft comprises a support shaft, a shaft end flange, a sleeve, a rectangular key, a bearing, a fastening nut, a through joint, an adapter, a piston, a disc spring, a pressing sleeve, a tightening sleeve and a transmission shaft, the bearing passes through two holes of a front support seat, a bearing cover of the bearing is fixed on the front support seat, the support shaft is connected with a driven gear through the rectangular key, one end of the sleeve is in contact with the gear, the other end of the sleeve is in contact with the bearing, one end of the through joint is in threaded connection with one end of the adapter, the other end of the adapter is in threaded connection with the tightening sleeve, the through joint and a center hole of the adapter are concentrically arranged,
the shaft end flange is fixedly connected with the pressing sleeve, a plurality of disc springs are arranged between the pressing sleeve and the fastening nut, the fastening nut is connected with the tightening sleeve,
the spring sleeve is arranged outside the piston, the inner end part of the transmission shaft penetrates through the tightening sleeve and is connected with the piston, the piston and the spring are integrally positioned inside the tightening sleeve, the piston can slide in a cavity channel of a central hole of the tightening sleeve, a central hole of the support shaft, a central hole of the through joint and the center of the adapter form an air source channel, and the central hole of the tightening sleeve is a sealed cavity channel;
two guide shafts are arranged between the front supporting seat and the rear supporting seat, two ends of each guide shaft are respectively fixed in corresponding holes of the front supporting seat and the rear supporting seat, the two guide shafts respectively penetrate through the fixed seat, and the fixed seat is connected with an external installation piece through a bolt;
the shaft end flange is connected with the pressing sleeve through a bolt, and the fastening nut is in threaded connection with the tightening sleeve.
2. The mounted twin-shaft automatic tightening device according to claim 1, characterized in that: the outer side of the pressing sleeve is provided with a plurality of semicircular pits, the outer side of the screwing sleeve is provided with a plurality of tapered holes, a plurality of torque detectors are arranged between the semicircular pits and the tapered holes, the number of the semicircular pits, the number of the tapered holes and the number of the torque detectors are in one-to-one correspondence, the torque detectors are steel balls, the steel balls can rotate in the semicircular pits, and when a certain torque is achieved, the steel balls are separated from the semicircular pits.
3. The mounted twin-shaft automatic tightening device according to claim 1, characterized in that: the outer end part of the transmission shaft is provided with an inner hexagonal wrench.
4. The mounted twin-shaft automatic tightening device according to claim 3, characterized in that: and a magnet is fixed at the outer end part of the transmission shaft.
5. The mounted twin-shaft automatic tightening device according to claim 1, characterized in that: the first end of the driving support is fixedly connected with the front supporting seat through a bolt, and the second end of the driving support is connected with the rear supporting seat through a bolt.
6. An operation method of the mounted double-shaft automatic tightening device according to claim 1, characterized in that: which comprises the following steps:
s1, the servo motor drives the main gear to mesh with the two driven gears;
s2, when the bolt needs to be screwed down, the magnet at the end of the transmission shaft attracts the bolt to be screwed down and enables the bolt to be screwed down to be horizontal, and in the screwing process, the air cylinder pushes the screwing device to move forwards;
s3, when the torque of a tightening shaft reaches a preset value, the torque detector generates a tiny deformation, the change signal is detected by the proximity switch, then the change signal is transmitted to the control center, the control center controls the servo motor to stop, the tightening section of the transmission shaft is bounced off by the spring action in the channel, and the tightening shaft is separated from the bolt;
and S4, the servo motor is continuously started, another bolt to be screwed is screwed until the proximity switch detects a change signal again, the two bolts finish the screwing work, and the air cylinder reversely acts to reset the screwing device.
CN201910974376.5A 2019-10-14 2019-10-14 Installation type double-shaft automatic tightening device and operation method thereof Active CN110640448B (en)

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Application Number Priority Date Filing Date Title
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CN110640448B true CN110640448B (en) 2021-04-09

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CN111250946A (en) * 2020-01-20 2020-06-09 西安理工大学 Portable flange joint dismouting device
CN112372283A (en) * 2020-11-09 2021-02-19 李爱华 Engine wire harness buckle tightening device
CN112296645A (en) * 2020-11-17 2021-02-02 苏州英叶达智能设备科技有限公司 Multi-station screw locking machine
CN113043007B (en) * 2021-04-01 2022-09-27 东风本田汽车有限公司 Bolt tightening shaft, automatic bolt tightening device and control method thereof
CN113635253A (en) * 2021-08-17 2021-11-12 合肥工业大学 Multi-head impact fastening device suitable for small-spacing use

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CN201906974U (en) * 2010-12-03 2011-07-27 上海亿盟电气自动化技术有限公司 Automatic calibrating and locking device for thermal tripping screw nail
US20130047790A1 (en) * 2011-08-29 2013-02-28 Verizon Patent And Licensing Inc. Variable-span multi-blade screwdriver
CN205002903U (en) * 2015-10-14 2016-01-27 上海哈特工业设备有限公司 Moment of torsion overload protective device
CN206780272U (en) * 2017-06-19 2017-12-22 中铁电气化局集团有限公司 Novel biaxial tightening device
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CN110227927A (en) * 2019-05-22 2019-09-13 郭毅义 A kind of large sealing lid synchronization bolt fastener

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