Synchronous and automatic double-end stud screwing device and working method

Abstract

The invention discloses a synchronous and automatic double-end stud screwing device and a working method, and belongs to the technical field of synchronous and automatic double-end stud screwing. According to the device, a single rotating part drives other rotating parts to operate synchronously through multiple sets of devices outside and inside the box body. The four groups of screwing mechanisms are used for screwing or anti-loosening; and the pushing mechanism associates the multiple groups of synchronous mechanisms, and performs synchronous pre-driving / reverse loosening and screwing. The problems that according to existing single-shaft pre-tightening or tightening, the number of tightening parts is large, the workload is large, and consumed time is long are solved, efficient synchronous pre-tightening and controllable tightening can be achieved, and the high quality of work is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of synchronous automatic tightening technology for double-ended studs, and more specifically, to a rotary linkage mechanism. Background Technology

[0002] Double-ended studs are cylindrical fasteners with threads at both ends, widely used in power, chemical, railway, and automotive industries. A double-ended stud connection involves screwing one end of the stud into the threaded hole of one of the connected parts, and passing the other end through the through hole of the other connected part. A washer is then placed on top, and the nut is tightened. Assembly of double-ended studs requires specialized tools. A typical double-ended stud tightener relies on external force to rotate the threaded sleeve, and then the tightening force generated by the contact between the push rod inside the threaded sleeve and the end face of the double-ended stud forces the first end into the base. Finally, a reverse rotational force unscrews the threaded sleeve from the double-ended stud.

[0003] For a batch of double-ended studs with uniform distribution on a single slender workpiece that need to be tightened, the traditional method of tightening double-ended studs is to manually use an electric or pneumatic wrench to pre-drive one side of the screw into the designated wrench head and then tighten it. After tightening, the wrench head needs to be separated from the screw and reversed to loosen it. The disadvantages are that the workload is large, the time is long, and the efficiency is low.

[0004] In view of the problems existing in the above-mentioned existing technology, it is necessary to research and design a new type of double-headed stud synchronous automatic tightening device to overcome the problems existing in the existing technology. Summary of the Invention

[0005] The traditional double-ended stud tightening method described above suffers from technical problems such as manual tightening using pneumatic or electric wrenches, repeated pre-tightening, inconsistent tightening degree, large workload, low efficiency, and long time consumption. Based on this, the present invention provides an improved synchronous automatic tightening device for double-ended studs. The device implements synchronous rotation and can be driven by a single shaft, thereby achieving the purpose of improving work efficiency and maintaining consistent tightening degree.

[0006] The technical solution adopted in this invention is: a double-headed stud synchronous automatic tightening device, the device comprising a synchronization mechanism, a pushing mechanism, a tightening mechanism and a housing; The enclosure includes a front cover, a right side panel, a left side panel, and a spline shaft position plate; The pushing mechanism includes a telescopic cylinder, a spring compression balance plate, and a spring. The telescopic cylinder is fixed to the front cover plate of the box. The telescopic rod of the telescopic cylinder is connected to the spring compression balance plate inside the box. The spring compression balance plate compresses and restores the spring by moving back and forth through the telescopic cylinder. One end of the spring is set at the spring compression balance plate, and the other end acts on the synchronous wheel of the synchronization mechanism. The tightening mechanism includes a gun head, a spline shaft assembly, a spline shaft, and a drive shaft connection assembly; the gun head is located at one end of the spline shaft via the spline shaft assembly, and the spline shaft passes through the front cover plate of the housing, the spring compression balance plate, the spring, the synchronous pulley, and the other end of the spline shaft position plate and is connected to the drive shaft connector. The device is equipped with multiple sets of tightening mechanisms. When the drive shaft is connected to the spline shaft, the spline shaft assembly transmits torque, and the gun head rotates clockwise or counterclockwise. The synchronization mechanism is located inside the housing and includes a synchronization pulley, a synchronization belt, a bearing housing, and a tensioning pulley. The synchronization belt is connected to the synchronization pulley, and the synchronization pulley is axially engaged with the splined shaft in the tightening mechanism. A tension adjustment nut is provided on the left side panel. The tension adjustment nut adjusts the distance that the tensioning pulley acts on the synchronization belt, thereby adjusting the tension of the synchronization belt.

[0007] Furthermore, the tension adjusting nut acts on one end of the tension wheel guide rod, and the other end of the tension wheel guide rod is connected to the tension wheel through the tension wheel shaft; a tension wheel balance groove is provided on the tension wheel guide rod, and the tension wheel balance rod passes through the tension wheel balance groove, with both ends of the tension wheel balance rod fixed to the housing.

[0008] Furthermore, bearing seats are respectively provided on the front cover plate of the housing and the spline shaft position plate, and the spline shaft cooperates with the bearing seats.

[0009] Furthermore, a shaft step and a friction plate are sequentially arranged in front of the spline shaft position plate, and the friction plate cooperates with the synchronous pulley.

[0010] Furthermore, the gun head is provided with threads that mate with a double-ended stud.

[0011] Furthermore, the gun head is sleeved on the end of the spline shaft via a gun head connector. The gun head connector is provided with a connector opening groove, and the two sides of the connector opening groove are a traveling stop and a reversing stop, respectively. A limiting stop pin is provided at the end of the spline shaft. When the spline shaft rotates in the forward direction, the limiting stop pin interacts with the traveling stop; when the spline shaft rotates in the reverse direction, the limiting stop pin interacts with the reversing stop.

[0012] The working method of the double-ended stud synchronous automatic tightening device includes the following steps: S1. After the double-ended stud enters the pre-twist nozzle, the telescopic cylinder pushes the spring to compress the balance plate, and the spring compresses the balance plate to compress the spring; after the spring is compressed to the synchronous pulley, the synchronous pulley moves forward. S2. The synchronous pulley and the friction plate generate frictional force. The synchronous pulley is connected to the synchronous belt. One set of splined shafts inputs driving force. The synchronous belt drives multiple sets of tightening mechanisms to pre-tighten simultaneously. S3. When the spline shaft rotates in the forward direction, the limit stop pin interacts with the travel stop edge of the connecting part's opening groove, causing the gun head to rotate in the forward direction and tighten the double-ended stud. S4. After the pre-stud is in place, the spline shaft rotates in the reverse direction, and the end of the spline shaft disengages from the end of the double-ended stud. When the limit stop pin interacts with the reverse flange and bottom bevel of the connecting part slot (tightening the front end of the gun head without moving it, and the rear end slightly retracts by about 0.3-0.5mm), it drives the gun head to rotate in the reverse direction, and unscrews the gun head off the double-ended stud. S5. The telescopic cylinder retracts, causing the synchronous wheel to disengage from the friction plate, and the spring compresses the balance plate back to its original position. This reciprocating motion completes the tightening of multiple double-headed studs.

[0013] Furthermore, the tension adjusting nut moves back and forth to adjust the tension force. Under the action of the tension wheel balance bar, it moves forward or backward in a balanced manner. When the tension adjusting nut moves the tension wheel forward, the tension wheel moves forward and presses down the synchronous belt, so that the synchronous belt is in a tensioned state. When the tension adjusting nut moves the tension wheel backward, the tension wheel moves backward and loosens the synchronous belt, so that the synchronous belt is in a slack state.

[0014] Furthermore, when the timing belt is in a slack state, multiple sets of splined shafts input driving force to tighten a single double-ended stud.

[0015] Furthermore, the synchronization mechanism is located inside the housing and includes a synchronization pulley, a synchronization belt, a bearing seat, and a tensioning pulley. The synchronization belt is connected to the synchronization pulley, and the tensioning pulley acts on the synchronization belt. A tension adjustment nut is provided on the left side panel. The synchronization pulley is axially connected to the tightening mechanism. The propulsion device includes a telescopic cylinder, a spring-compressed balance plate, and a spring. The telescopic cylinder is fixed to the front cover plate of the box. The telescopic rod of the telescopic cylinder is connected to the spring compression balance plate inside the box. The spring compression balance plate compresses and restores the spring by moving back and forth through the telescopic cylinder. One end of the spring is set at the spring compression balance plate, and the other end acts on the synchronous pulley. The tightening mechanism includes a gun head, a spline shaft assembly, a spline shaft, and a drive shaft connection assembly. The gun head is located at one end of the spline shaft via the spline shaft assembly. The spline shaft passes through a spring compression balance plate, a spring, and a synchronous pulley in sequence. The other end of the spline shaft is connected to the drive shaft connector via a bearing seat. When the drive shaft is connected to the spline shaft for driving, the spline shaft assembly transmits torque, and the gun head rotates clockwise or counterclockwise.

[0016] Furthermore, the tension adjusting nut moves back and forth to adjust the tension force. Under the action of the tension wheel balance bar, it moves forward in a balanced manner. The tension adjusting nut moves the tension wheel forward, and the forward movement of the tension wheel presses the synchronous belt lower than the rotary linkage mechanism, so that the synchronous belt is in a tensioned state.

[0017] Furthermore, the gun head is provided with threads that mate with a double-ended stud.

[0018] Working method of the double-ended stud synchronous automatic tightening device: After the double-ended stud enters the pre-tightening nozzle, the telescopic cylinder pushes the spring to compress the balance plate, and the spring compresses the balance plate to compress the spring; after the spring is compressed to the synchronous pulley, the synchronous pulley moves forward. The synchronous pulley generates frictional force with the friction plate. The synchronous pulley is connected to the synchronous belt, and the synchronous belt drives multiple sets of tightening mechanisms to pre-tighten simultaneously. After the pre-tensioning is in place, the telescopic cylinder retracts to tighten the multi-axis screws. After the multi-axis screws are tightened, the telescopic cylinder moves forward to achieve synchronous loosening of the multi-axis screws. Then it returns to its original position. This reciprocating motion completes the tightening of multiple double-headed studs.

[0019] Compared with the prior art, the present invention has the following advantages: The double-ended stud synchronous tightening linkage device provided by this invention can realize the simultaneous pre-tensioning and reverse tightening of multiple sets of synchronous mechanisms, and has a wide range of applications. The double-ended stud synchronous tightening linkage device provided by this invention is characterized by low manufacturing cost, simple assembly and maintenance, labor saving, improved work efficiency, and reliable performance. In summary, the technical solution of this invention solves the problems of low work efficiency caused by traditional manual electric and pneumatic wrench tightening, such as large workload and inconsistent tightening degrees. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the examples or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an overall diagram of the double-ended stud synchronous automatic tightening device.

[0022] Figure 2 This is an exploded schematic diagram of a double-headed stud synchronous automatic tightening device; Figure 3 This is an axial view of the double-headed stud synchronous automatic tightening device of the present invention.

[0023] Figure 4 yes Figure 3 Sectional view of AA.

[0024] Figure 5 This is a partial sectional view of a double-ended stud synchronous automatic tightening device.

[0025] Figure 6 This is a magnified view of the gun head.

[0026] Figure 7 This is a schematic diagram of the tightening mechanism.

[0027] Figure 8This is a schematic diagram of the synchronization mechanism.

[0028] Figure 9 This is a schematic diagram of the driving and synchronizing mechanisms.

[0029] Figure 10 This is a sectional view of the spline shaft.

[0030] In the diagram: 101, housing; 102, front cover plate of housing; 201, right side panel; 202, left side panel; 203, splined shaft position plate; 301, synchronous pulley; 302, synchronous belt; 303, bearing housing; 304, tensioning pulley; 305, tensioning pulley balance bar; 306, tension adjusting nut; 307, tensioning pulley guide rod; 308, tensioning pulley balance groove; 401, telescopic cylinder; 402, spring compression balance plate; 403, spring; 501, gun head; 502, splined shaft assembly; 503, splined shaft; 504, drive shaft connector; 505, shaft step; 506, friction plate; 507, gun head connector; 508, connector opening slot; 509, traveling stop; 510, reversing stop; 511, limit stop pin. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0036] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly. Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0037] Figures 1 to 10A synchronous automatic tightening device for double-ended studs is shown. The device includes a synchronizing mechanism, a pushing mechanism, a tightening mechanism, and a housing 101. The housing 101 includes a front cover plate 102, a right side panel 201, a left side panel 202, and a splined shaft position plate 203.

[0038] The driving mechanism includes a telescopic cylinder 401, a spring compression balance plate 402, and a spring 403. The telescopic cylinder 401 is fixed on the front cover plate 102 of the housing. The telescopic rod of the telescopic cylinder 401 is connected to the spring compression balance plate 402 inside the housing. The spring compression balance plate 402 compresses and restores the spring 403 by moving the telescopic cylinder 401 back and forth. One end of the spring 403 is set at the spring compression balance plate 402, and the other end acts on the synchronous wheel 301 of the synchronization mechanism. The tightening mechanism includes a gun head 501, a spline shaft assembly 502, a spline shaft 503, and a drive shaft connection assembly 504. The gun head 501 is located at one end of the spline shaft 503 via the spline shaft assembly 502. The spline shaft 503 passes through the front cover plate 102 of the housing, the spring compression balance plate 402, the spring 403, the synchronous pulley 301, and the other end of the spline shaft position plate 203 and is connected to the drive shaft connection assembly 504. The device is equipped with multiple sets of tightening mechanisms. When the drive shaft is connected to the spline shaft 503, the spline shaft assembly 502 transmits torque, and the gun head 501 rotates clockwise or counterclockwise. The synchronization mechanism is located inside the housing and includes a synchronization pulley 301, a synchronization belt 302, a bearing seat 303, and a tensioning pulley 304. The synchronization belt 302 is connected to the synchronization pulley 301, and the synchronization pulley 301 is axially engaged with the splined shaft 503 in the tightening mechanism. A tension adjusting nut 306 is provided on the left side panel 202. The tension adjusting nut 306 adjusts the distance that the tensioning pulley 304 acts on the synchronization belt 302, thereby adjusting the tension of the synchronization belt 302.

[0039] Furthermore, the tension adjusting nut 306 acts on one end of the tension wheel guide rod 307, and the other end of the tension wheel guide rod 307 is connected to the tension wheel 304 through the tension wheel shaft; a tension wheel balance groove 308 is provided on the tension wheel guide rod 307, and a tension wheel balance rod 305 passes through the tension wheel balance groove 308, with both ends of the tension wheel balance rod 305 fixed to the housing.

[0040] Furthermore, bearing seats 303 are respectively provided on the front cover plate 102 of the housing and the spline shaft position plate 203, and the spline shaft 503 cooperates with the bearing seats 303.

[0041] Furthermore, a shaft step 505 and a friction plate 506 are sequentially arranged in front of the spline shaft position plate 203 on the spline shaft 503, and the friction plate 506 cooperates with the synchronous pulley 301.

[0042] Furthermore, the gun head 501 is provided with threads that mate with the double-ended stud.

[0043] Furthermore, the gun head 501 is sleeved on the end of the spline shaft 503 via the gun head connector 507. The gun head connector 507 is provided with a connector opening groove 508. The two sides of the connector opening groove 508 are a traveling stop 509 and a reversing stop 510, respectively. The end of the spline shaft 503 is provided with a limiting stop pin 511. When the spline shaft 503 rotates in the forward direction, the limiting stop pin 511 interacts with the traveling stop 509; when the spline shaft 503 rotates in the reverse direction, the limiting stop pin 511 interacts with the reversing stop 510.

[0044] The working method of the double-ended stud synchronous automatic tightening device includes the following steps: S1. After the double-ended stud enters the pre-twist nozzle 501, the telescopic cylinder 401 pushes the spring to compress the balance plate 402, and the spring to compress the balance plate 402 compresses the spring 403; after the spring 403 is compressed to the synchronous pulley 301, the synchronous pulley 301 moves forward. S2. The synchronous pulley 301 and the friction plate 506 generate frictional force. The synchronous pulley 301 is connected to the synchronous belt 302. One set of splined shafts 503 inputs driving force, and the synchronous belt 302 drives multiple sets of tightening mechanisms to pre-tighten simultaneously. S3, the spline shaft 503 rotates in the forward direction, the limit stop pin 511 interacts with the travel stop edge 509 of the connecting part opening groove 508, driving the gun head 501 to rotate in the forward direction and tightening the double-ended stud. S4. After the pre-load is in place, the spline shaft 503 rotates in the opposite direction, and the end of the spline shaft 503 disengages from the end of the double-ended stud. When the limit stop pin 511 interacts with the reverse flange 510 of the connector opening groove 508, it drives the gun head 501 to rotate in the opposite direction, and unscrews the gun head 501 off the double-ended stud. S5. The telescopic cylinder 401 retracts, causing the synchronous wheel 301 to disengage from the friction plate 506, and the spring compresses the balance plate 402 to return to its original position. This reciprocating motion completes the tightening of multiple double-headed studs.

[0045] Furthermore, the tension adjusting nut 306 moves back and forth to adjust the tension force. Under the action of the tension wheel balance bar 305, it moves forward or backward in a balanced manner. When the tension adjusting nut 306 moves the tension wheel 304 forward, the tension wheel 304 moves forward and presses down the synchronous belt 302, so that the synchronous belt 302 is in a tensioned state. When the tension adjusting nut 306 moves the tension wheel 304 backward, the tension wheel 304 moves backward and loosens the synchronous belt 302, so that the synchronous belt 302 is in a slack state.

[0046] Furthermore, when the timing belt 302 is in a slack state, multiple sets of splined shafts 503 respectively input driving force to tighten a single double-ended stud.

[0047] Furthermore, the housing of the double-ended stud synchronous device is installed at the working position. Furthermore, the double-ended stud tightening mechanism is connected to the bearing housing through the housing position hole. Furthermore, the double-ended stud synchronizing mechanism is installed inside the synchronizing device housing and is coaxially connected to the double-ended stud tightening mechanism; Furthermore, the pushing mechanism is mounted on the front exterior and front interior of the housing, and is coaxial with the double-headed stud tightening mechanism.

[0048] Furthermore, the synchronization mechanism includes a synchronization pulley 301, a splined shaft 503, a synchronization belt 302, a tensioning device, and a tensioning pulley balance bar 305.

[0049] Furthermore, the synchronous pulley 301 is coaxially connected to the spline shaft 503, and multiple sets of linkage devices are synchronously connected through the synchronous belt 302 and the tensioning device. Under the action of the pushing mechanism, the synchronous linkage devices rotate synchronously.

[0050] Furthermore, the actuating mechanism includes a telescopic cylinder 401, a spring compression balance support plate 402, and a spring 403. The telescopic cylinder 401 is fixed to the front side of the synchronization device housing, and the spring compression balance support plate 402 and the spring 403 are coaxial with the tightening mechanism on the front side of the synchronization housing.

[0051] Furthermore, the telescopic cylinder push rod is connected to the spring compression balance plate 402, and the spring compression balance plate 402 compresses the spring 403.

[0052] Furthermore, the forward / reverse movement of the telescopic cylinder pushes the spring to compress the support plate 402, causing friction between the synchronous wheel 301 and the friction plate 506. The double-ended stud tightening device drives multiple tightening mechanisms to simultaneously tighten clockwise / counterclockwise until the parts are fully tightened.

[0053] Furthermore, the cylinder pushes the mechanism back to its original position, and the double-headed synchronous tightening mechanism drives the tightening shaft, tightening the double-headed studs onto the workpiece.

[0054] Furthermore, the cylinder pushes the linkage device forward, the rotary linkage device rotates synchronously, and the tightening shaft of the tightening mechanism loosens the double-ended stud and the tightening point of the gun head. This set of actions is repeated.

[0055] The present invention provides a double-headed stud synchronous automatic tightening device, comprising: a housing, an internal mechanism diagram, a synchronization mechanism, and a propulsion mechanism; the propulsion mechanism is installed at the front end of the synchronization device and is used to push the compression spring to cause friction between the synchronization wheel 301 and the friction plate 506 in the synchronization mechanism, so that the spline shaft 503 can be synchronously pre-tightened and quickly untied, and the tightening device automatically tightens after untiing.

[0056] The double-ended stud synchronization mechanism includes: a synchronization pulley 301, a synchronization belt 302, a tension pulley 304, a tension balance bar 305, a tension adjusting nut 306, and a friction plate 506 located behind the synchronization pulley 301 for generating friction with the synchronization pulley 301 to rotate synchronously. The synchronization belt is used to connect multiple sets of tightening mechanisms. The tension balance bar 305 is used to ensure that the tension pulley moves forward / backward in a straight line. The tension adjusting nut 306 is located on the left side of the housing and is used to adjust the tension of the tension pulley, so that the synchronization mechanism is in a synchronized state of tension and relaxation.

[0057] The propulsion mechanism includes: a telescopic cylinder 401, a spring-compressed balance plate 402, and a spring 403. The telescopic cylinder 401 is located on the side of the shaft hole of the housing and is fixed thereto. The spring-compressed balance plate 402 is connected to the push rod of the telescopic cylinder. When the telescopic cylinder 401 moves forward, the spring-compressed balance plate 402 moves axially forward, and the spring-compressed balance plate 402 compresses the spring 403, causing the synchronous wheel 301 to move forward and come into contact with the friction plate to generate friction.

[0058] The working process of this invention is as follows: After the double-headed stud enters the pre-tightening gun head 501 position, the telescopic cylinder 401 pushes the spring to compress the balance plate 402, the spring to compress the balance plate 402 to compress the spring 403, the spring compression force synchronous wheel 301 moves forward, the synchronous wheel 301 generates friction force with the friction plate, the synchronous wheel 301 is connected to the synchronous belt 302, the synchronous belt 302 is connected to the synchronous wheel 301 due to the tensioning mechanism to transmit rotational force, at this time multiple sets of double-headed tightening devices are pre-tightened at the same time, after the pre-tightening is in place, the telescopic cylinder 401 retracts, after multi-axis tightening the cylinder moves forward to realize multi-axis synchronous uncoiling, and then returns to the original position, and thus reciprocates to complete the tightening work of multiple double-headed studs.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-headed stud synchronous automatic tightening device, characterized in that, The device includes a synchronization mechanism, a pushing mechanism, a tightening mechanism, and a housing (101). The housing (101) includes a front cover plate (102), a right side panel (201), a left side panel (202), and a spline shaft position plate (203). The pushing mechanism includes a telescopic cylinder (401), a spring compression balance plate (402), and a spring (403). The telescopic cylinder (401) is fixed on the front cover plate (102) of the box. The telescopic rod of the telescopic cylinder (401) is connected to the spring compression balance plate (402) inside the box. The spring compression balance plate (402) compresses and restores the spring (403) by moving back and forth through the telescopic cylinder (401). One end of the spring (403) is set at the spring compression balance plate (402), and the other end acts on the synchronous wheel (301) of the synchronization mechanism. The tightening mechanism includes a gun head (501), a spline shaft assembly (502), a spline shaft (503), and a drive shaft connection assembly (504); the gun head (501) is set at one end of the spline shaft (503) through the spline shaft assembly (502), and the spline shaft (503) passes through the front cover plate (102) of the housing, the spring compression balance plate (402), the spring (403), the synchronous pulley (301), and the other end of the spline shaft position plate (203) and is connected to the drive shaft connector (504); The device is equipped with multiple sets of tightening mechanisms. When the drive shaft is connected to the spline shaft (503) and driven, the spline shaft assembly (502) transmits torque, and the gun head (501) rotates clockwise or counterclockwise. The synchronization mechanism is located inside the housing and includes a synchronization pulley (301), a synchronization belt (302), a bearing seat (303), and a tensioning pulley (304). The synchronization belt (302) is connected to the synchronization pulley (301), and the synchronization pulley (301) is axially engaged with the spline shaft (503) in the tightening mechanism. A tension adjusting nut (306) is provided on the left side panel (202). The tension adjusting nut (306) adjusts the distance that the tensioning pulley (304) acts on the synchronization belt (302), thereby adjusting the tension of the synchronization belt (302).

2. The double-headed stud synchronous automatic tightening device according to claim 1, characterized in that: The tension adjusting nut (306) acts on one end of the tension wheel guide rod (307), and the other end of the tension wheel guide rod (307) is connected to the tension wheel (304) through the tension wheel shaft; a tension wheel balance groove (308) is provided on the tension wheel guide rod (307), and a tension wheel balance rod (305) passes through the tension wheel balance groove (308), with both ends of the tension wheel balance rod (305) fixed to the housing.

3. The double-ended stud synchronous automatic tightening device according to claim 1, characterized in that: The front cover plate (102) of the housing and the spline shaft position plate (203) are respectively provided with bearing seats (303), and the spline shaft (503) cooperates with the bearing seats (303).

4. The double-ended stud synchronous automatic tightening device according to claim 1, characterized in that: The spline shaft (503) has a shaft step (505) and a friction plate (506) arranged in sequence in front of the spline shaft position plate (203), and the friction plate (506) cooperates with the synchronous pulley (301).

5. The double-ended stud synchronous automatic tightening device according to claim 1, characterized in that: The gun head (501) is provided with threads that mate with the double-ended stud.

6. The double-ended stud synchronous automatic tightening device according to claim 1, characterized in that: The gun head (501) is sleeved on the end of the spline shaft (503) through the gun head connector (507). The gun head connector (507) is provided with a connector opening groove (508). The two sides of the connector opening groove (508) are a traveling stop (509) and a reversing stop (510) respectively. The end of the spline shaft (503) is provided with a limiting stop pin (511). When the spline shaft (503) rotates in the forward direction, the limiting stop pin (511) interacts with the traveling stop (509); when the spline shaft (503) rotates in the reverse direction, the limiting stop pin (511) interacts with the reversing stop (510).

7. The working method of the double-ended stud synchronous automatic tightening device according to any one of claims 1-6, characterized in that, Includes the following steps: S1. After the double-ended stud enters the pre-twist nozzle (501), the telescopic cylinder (401) pushes the spring to compress the balance plate (402), and the spring to compress the balance plate (402) compresses the spring (403); after the spring (403) is compressed to the synchronous pulley (301), the synchronous pulley (301) moves forward; S2, the synchronous pulley (301) and the friction plate (506) generate frictional force. The synchronous pulley (301) is connected to the synchronous belt (302). One set of splined shafts (503) inputs driving force. The synchronous belt (302) drives multiple sets of tightening mechanisms to pre-tighten simultaneously. S3. When the spline shaft (503) rotates in the forward direction, the limit stop pin (511) interacts with the travel stop edge (509) of the connecting slot (508), causing the gun head (501) to rotate in the forward direction and tighten the double-ended stud. S4. After the pre-load is in place, the spline shaft (503) rotates in the opposite direction, and the end of the spline shaft (503) disengages from the end of the double-ended stud. When the limit stop pin (511) interacts with the reverse stop (510) of the connector opening slot (508), it drives the gun head (501) to rotate in the opposite direction, and unscrews the gun head (501) off the double-ended stud. S5. The telescopic cylinder (401) moves backward, causing the synchronous wheel (301) to disengage from the friction plate (506), and the spring compresses the balance plate (402) to return to its original position. This reciprocating motion completes the tightening of multiple double-headed studs.

8. The working method according to claim 7, characterized in that: The tension adjusting nut (306) moves back and forth to adjust the tension force. Under the action of the tension wheel balance bar (305), it moves forward or backward in balance. When the tension adjusting nut (306) moves the tension wheel (304) forward, the tension wheel (304) moves forward and presses down the synchronous belt (302), so that the synchronous belt (302) is in a tensioned state. When the tension adjusting nut (306) moves the tension wheel (304) backward, the tension wheel (304) moves backward and loosens the synchronous belt (302), so that the synchronous belt (302) is in a slack state.

9. The working method according to claim 8, characterized in that: When the timing belt (302) is in a slack state, multiple sets of splined shafts (503) input driving force to tighten a single double-ended stud.

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