CN112975813A - Three-spring elastic shaft automatic feeding screw tightening device - Google Patents
Three-spring elastic shaft automatic feeding screw tightening device Download PDFInfo
- Publication number
- CN112975813A CN112975813A CN202110216261.7A CN202110216261A CN112975813A CN 112975813 A CN112975813 A CN 112975813A CN 202110216261 A CN202110216261 A CN 202110216261A CN 112975813 A CN112975813 A CN 112975813A
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- tightening
- shaft
- elastic shaft
- joint
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
The invention relates to a three-spring elastic shaft automatic feeding screw tightening device, which is used for quickly and automatically replacing a new energy electric automobile battery pack and also can be used for automatically tightening screws of an automobile power assembly line; the device comprises an elastic tightening shaft, a shell and a mounting substrate, wherein the elastic tightening shaft is positioned in a cylindrical shell and is coaxial with the cylindrical shell; the elastic tightening shaft is composed of a screw sleeve, an elastic shaft and a tightening joint, the tightening joint is of a stepped shaft structure, the upper section of the tightening joint is a guide surface and is in sliding fit with the sliding bush, the middle section and the lower section of the tightening joint penetrate out of the round hole of the mounting substrate, and the middle section of the tightening joint is sequentially provided with an upper sliding ring, a return spring, a lower sliding ring and a locking nut. A spline groove is formed in the screw sleeve; the elastic shaft consists of three completely consistent spiral springs which are coaxial; the invention realizes automatic feeding in the screw tightening process, reduces the manufacturing cost and realizes the light weight of equipment.
Description
Technical Field
The invention relates to a three-spring elastic shaft automatic feeding screw tightening device, which is used for quickly and automatically replacing a new energy electric automobile battery pack and also can be used for automatically tightening screws of an automobile power assembly line, and has the characteristics of light and compact structure and low cost.
Background
With the gradual implementation of new policies in the automobile industry in our country, the proportion of electric automobiles in the production and sale of finished automobiles is higher and higher. The problem of long time consumption for charging of the electric automobile is always the central importance of the development of new energy automobiles and is also one of important factors restricting the use of the electric automobile. The quick automatic replacement of the battery pack of the electric automobile also becomes a quick battery replacement technology, and the battery pack consuming power on the electric automobile is replaced by the fully charged battery pack, so that the situation that an electric automobile owner waits for the battery to be charged for a long time can be avoided. The method has a mature technical foundation, so that the method becomes one of the important research fields in the electric automobile industry. In the quick battery replacement technology, the most reliable connection mode for installing the battery pack is screw connection. In the battery replacing process, the battery replacing equipment firstly needs to loosen a plurality of connecting bolts between a primary battery pack and a vehicle body on the automobile so as to take down the battery pack, then screws the fully charged battery pack and the vehicle body through screws, and the series of processes are all automatically completed. In the process of screwing or loosening the screw, the screw rotates and simultaneously needs to do axial feeding movement, the electric wrench only can provide power for rotating the screw, and the axial feeding of the screw needs to be realized by an automatic feeding device. Before, the automatic feeding of the screw mostly adopts a telescopic spline, and the telescopic spline ensures the joint of a screw nut and a sleeve under the assistance of a spring. However, the manufacturing of the telescopic spline has high precision requirement, so that the manufacturing cost of the device is high, and the whole device has high mass and also causes extra burden to equipment. The invention provides an automatic feeding screw tightening device with a three-spring elastic shaft, which replaces a telescopic spline mechanism with the elastic shaft, has low manufacturing cost and contributes to light weight of equipment.
Disclosure of Invention
The invention aims to provide an automatic screw feeding and tightening device with a three-spring elastic shaft.
The technical scheme of the invention is realized as follows:
a three-spring elastic shaft automatic feed screw tightening device mainly comprises an elastic tightening shaft 1-1, a shell 1-2 and a mounting substrate 1-4, wherein the elastic tightening shaft 1-1 is positioned in the cylindrical shell 1-2 and is coaxial with the cylindrical shell 1-2, a sliding bush 1-3 is embedded at the lower part of the shell 1-2, and the bottom of the shell 1-2 is connected with the mounting substrate 1-4.
Further, the elastic tightening shaft 1-1 is composed of a screw sleeve 2-1, an elastic shaft 2-2 and a tightening joint 2-3, wherein the elastic shaft 2-2 is located in the middle, and two ends of the elastic shaft are fixedly connected with the screw sleeve 2-1 and the tightening joint 2-3 respectively.
Furthermore, the tightening joint 2-3 is of a stepped shaft structure, the upper section of the tightening joint is a guide surface and is in sliding fit with the sliding bush 1-3, and the middle section and the lower section of the tightening joint 2-3 penetrate out of the round hole of the mounting base plate 1-4.
Further, the diameter of the guide surface of the screw joint 2-3 is larger than the diameter of the round hole of the mounting base plate 1-4, and the guide surface of the screw joint 2-3 is limited on the side of the sliding bush 1-3.
Furthermore, the middle section of the tightening joint 2-3 is sequentially provided with an upper sliding ring 1-5, a reset spring 1-6, a lower sliding ring 1-7 and a locking nut 1-8, the locking nut 1-8 is fixed by threads at the bottom of the middle section, the upper sliding ring 1-5 is attached to the bottom of the mounting substrate 1-4 under the action of the reset spring 1-6, and the lower sliding ring 1-7 is attached to the upper end of the locking nut 1-8.
Furthermore, gaps are reserved between the upper sliding ring, the lower sliding ring, the return springs 1-6 and the tightening joints 2-3.
Furthermore, a spline groove is formed in the screw sleeve 2-1 and is in spline fit with a screw nut, and a magnet is embedded at the bottom of the screw sleeve 2-1.
Furthermore, the elastic shaft 2-2 is composed of three completely identical spiral springs which are coaxial, end points of the three springs are uniformly distributed on the same circumference, and two ends of each of the three springs are welded with the screw sleeve 2-1 and the tightening joint 2-3.
Further, the lower section of the tightening joint 2-3 is a hexagonal prism and is matched with a sleeve of an electric wrench.
Further, the three springs form a compressible elastic shaft, and automatic axial feeding in the screw tightening process is achieved.
The screw tightening device has the beneficial effects that the automatic feeding in the screw tightening process is realized, the manufacturing cost is reduced, and the light weight of equipment is realized.
Drawings
FIG. 1 is a sectional view showing the structure of an automatic screw feeding and tightening apparatus for a three-spring elastic shaft according to the present invention;
FIG. 2 is a schematic structural view of an automatic screw feeding and tightening device with a three-spring elastic shaft according to the present invention;
FIG. 3 is an exploded view of the three spring shaft auto-feed screw tightening device of the present invention;
FIG. 4 is a schematic view of the structure of the resilient tightening shaft;
FIG. 5 is a structural view of the elastic shaft;
FIG. 6 is a schematic cross-sectional view of the elastic shaft;
FIG. 7 is an initial state view of the automatic screw feeding and tightening apparatus for a three-spring elastic shaft according to the present invention;
FIG. 8 is a view showing a state where the three-spring elastic shaft automatic feed screw tightening apparatus according to the present invention starts to be tightened;
FIG. 9 is a view showing a state in which the three-spring elastic shaft automatic feed screw tightening apparatus according to the present invention completes tightening;
in the figure: 1-1 of an elastic tightening shaft, 1-2 of a shell, 1-3 of a sliding bush, 1-4 of a mounting substrate, 1-5 of an upper sliding ring, 1-6 of a return spring, 1-7 of a lower sliding ring and 1-8 of a locking nut;
2-1, screwing a sleeve, 2-2, screwing an elastic shaft, and 2-3, screwing a joint;
3-1, 3-2, B, 3-3 and C.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings as follows:
referring to fig. 1, 2 and 3, the invention is composed of a flexible tightening shaft 1-1, a housing, and a mounting substrate, wherein the flexible tightening shaft 1-1 is coaxially located in a cylindrical housing 1-2, a sliding bush 1-3 is embedded in the lower portion of the housing, the bottom of the housing is screwed with the mounting substrate 1-4, and the mounting substrate is used for fixing the device.
Referring to fig. 4, the elastic tightening shaft 1-1 is composed of a screw sleeve 2-1, an elastic shaft 2-2 and a tightening joint 2-3, the elastic shaft 2-2 is located in the middle, two ends of the elastic shaft 2-2 are respectively fixedly connected with the screw sleeve 2-1 and the tightening joint 2-3, the tightening joint 2-3 is of a stepped shaft structure, the upper section of the tightening joint is a guide surface and is in sliding fit with the sliding bush 1-3, the middle section and the lower section of the tightening joint 2-3 penetrate through a round hole of the mounting base plate 1-4, the diameter of the guide surface of the tightening joint 2-3 is larger than that of the round hole of the mounting base plate 1-4, so that the guide surface of the tightening joint 2-3 is limited at one side of the sliding bush 1-3, and the middle section of the tightening joint 2-3 is sequentially provided with an upper sliding ring 1-5, a, The lower sliding ring 1-7 and the locking nut 1-8 are fixed by middle section bottom threads, the upper sliding ring 1-5 is always attached to the bottom of the mounting substrate 1-4 under the action of the reset spring 1-6, the lower sliding ring 1-7 is always attached to the upper end of the locking nut 1-8, a large gap is reserved between the upper sliding ring, the lower sliding ring, the reset spring 1-6 and the tightening joint 2-3, and the reset spring 1-6 is separated from the mounting substrate 1-4 by the sliding ring when the tightening joint 2-3 rotates, so that the abrasion of the reset spring 1-6 is avoided.
The screw sleeve 2-1 is internally provided with a spline groove which is matched with a screw nut through splines and used for transmitting the screwing torque of the screw, and the bottom of the screw sleeve is inlaid with a magnet to play a role in adsorbing the screw.
The elastic shaft 2-2 is composed of three completely identical spiral springs, referring to fig. 5 and 6, the three spiral springs are respectively a spiral spring A3-1, a spiral spring B3-2 and a spiral spring C3-3, the three spiral springs are coaxial, end points of the three spiral springs are uniformly distributed on the same circumference, two ends of the three spiral springs are respectively welded with the screw sleeve 2-1 and the tightening joint 2-3 together to play a role in transmitting torque, and meanwhile, the three spiral springs are uniformly distributed, so that the spiral springs can be prevented from excessively inclining.
The lower section of the tightening joint is a hexagonal prism which can be matched with a sleeve of an electric wrench for transmitting the torque of the electric wrench.
As shown in an initial state of fig. 7, the device is fixed on equipment through a mounting substrate 1-4, screws are arranged in screw sleeves 2-1, the distance between a screw flange surface and a mounting surface in a mounting hole is H, the elastic shaft 2-2 is in a natural state at the moment, the return spring 1-6 is in a small-amount compression state at the moment, and a shaft shoulder at the bottom of the upper section of the joint 2-3 is screwed down to be attached to the mounting substrate under the action of spring force.
When the screw needs to be screwed, referring to fig. 8, the electric wrench socket is matched with the hexagonal prism at the lower section of the screwing joint 2-3 and continuously rises for a distance H, at this time, the return spring 1-6 continuously compresses the length H, the guide surface of the screwing joint slides upwards under the guide effect of the sliding bush 1-3, the screw moves upwards under the drive of the elastic screwing shaft 1-1, the conical guide surface at the top of the screw enters the mounting hole, the external thread of the screw is axially attached to the internal thread of the threaded hole, the screw cannot continuously rise due to the blocking of the threaded hole, at this time, the elastic shaft 2-2 is compressed by H1, and the compression amount is just equal to the distance between the flange surface of the screw and the mounting surface, namely the feeding amount required by screwing the screw. And then, the electric wrench rotates, the elastic tightening shaft is driven by the electric wrench to rotate, axial feeding force is provided for the screw due to the fact that the elastic shaft is in a compressed state, the screw is screwed into the screw hole, and meanwhile, the compression amount of the elastic tightening shaft is gradually released until the flange face of the screw is attached to the mounting face. When the elastic tightening shaft rotates, the locking nut 1-8 screwed with the elastic tightening shaft also rotates along with the elastic tightening shaft, the reset spring is respectively isolated from the mounting base plate 1-4 and the locking nut by the upper sliding ring 1-5 at the upper part and the sliding ring 1-7 at the lower part, the abrasion of the spring is avoided, and meanwhile, the friction resistance of the device is also reduced due to the lower friction coefficient between the sliding ring and the mounting base plate as well as between the sliding ring and the locking nut.
When the screwing torque of the screw reaches a specified value, the electric wrench is disengaged, the elastic shaft 1-1 is restored to the initial position under the action of the return spring 1-6, the screwing process is completed, and the state of the device is shown in figure 9.
When the device is required to loosen an installed screw, the electric wrench is matched with the elastic tightening shaft, the lifting distance is H, the screw sleeve at the upper end of the elastic tightening shaft is matched with the screw nut, so that torque is conveniently transmitted, the electric wrench rotates reversely, the screw is loosened, and the screw moves downwards under the action of the contact force of the threads until the screw is unscrewed due to the compression of the elastic tightening shaft; the electric wrench is separated, the elastic tightening shaft is reset, the screw is separated from the mounting hole along with the tightening sleeve under the adsorption effect of the magnet in the screw sleeve 2-1, and the screw disassembling process is completed. In order to ensure that the screw is smoothly separated from the threaded hole, the upper distance H of the tightening wrench can be set to be smaller than the distance between the flange surface of the screw and the mounting surface (the distance between the screw and the screw sleeve completely), the spline fit between the screw and the screw sleeve can meet the requirement of torque transmission, and after the electric wrench stops rotating, the screw has enough descending space, so that the condition that the screw is not screwed out completely is avoided.
In addition, because the elastic tightening shaft has a certain degree of radial deformation capacity, when the alignment of the screw and the mounting hole is inaccurate, the smooth matching of the screw sleeve and the screw nut can be ensured through the elastic deformation of the elastic shaft, so that the device has a certain degree of hole position deviation adaptability.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims. And those not described in detail in this specification are well within the skill of those in the art.
Claims (10)
1. The utility model provides a three spring elastic shaft auto-feed screw tightening device which characterized in that: the device mainly comprises an elastic tightening shaft (1-1), a shell (1-2) and a mounting substrate (1-4), wherein the elastic tightening shaft (1-1) is positioned in the cylindrical shell (1-2) and coaxial with the cylindrical shell (1-2), a sliding bush (1-3) is embedded in the lower portion of the shell (1-2), and the bottom of the shell (1-2) is connected with the mounting substrate (1-4).
2. The three-spring elastic shaft automatic feed screw tightening device according to claim 1, characterized in that: the elastic tightening shaft (1-1) is composed of a screw sleeve (2-1), an elastic shaft (2-2) and a tightening joint (2-3), the elastic shaft (2-2) is located in the middle, and two ends of the elastic shaft are fixedly connected with the screw sleeve (2-1) and the tightening joint (2-3) respectively.
3. The three-spring elastic shaft automatic feed screw tightening device according to claim 2, characterized in that: the tightening joint (2-3) is of a stepped shaft structure, the upper section of the tightening joint is a guide surface and is in sliding fit with the sliding bush (1-3), and the middle section and the lower section of the tightening joint (2-3) penetrate out of the round hole of the mounting base plate (1-4).
4. The three-spring elastic shaft automatic feed screw tightening device according to claim 3, characterized in that: the diameter of the guide surface of the tightening joint (2-3) is larger than the diameter of the round hole of the mounting base plate (1-4), and the guide surface of the tightening joint (2-3) is limited on one side of the sliding bush (1-3).
5. The three-spring elastic shaft automatic feed screw tightening device according to any one of claims 1 to 4, characterized in that: the middle section of the tightening joint (2-3) is sequentially provided with an upper sliding ring (1-5), a reset spring (1-6), a lower sliding ring (1-7) and a locking nut (1-8), the locking nut (1-8) is fixed by threads at the bottom of the middle section, the upper sliding ring (1-5) is attached to the bottom of the mounting substrate (1-4) under the action of the reset spring (1-6), and the lower sliding ring (1-7) is attached to the upper end of the locking nut (1-8).
6. The three-spring elastic shaft automatic feed screw tightening device according to claim 5, characterized in that: gaps are reserved between the upper sliding ring, the lower sliding ring, the return spring (1-6) and the tightening joint (2-3).
7. The three-spring elastic shaft automatic feed screw tightening device according to claim 2, characterized in that: the screw sleeve (2-1) is internally provided with a spline groove which is matched with a screw nut by a spline, and the bottom of the screw sleeve (2-1) is inlaid with a magnet.
8. The three-spring elastic shaft automatic feed screw tightening device according to claim 2, characterized in that: the elastic shaft (2-2) is composed of three completely consistent spiral springs, the three springs are coaxial, end points of the three springs are uniformly distributed on the same circumference, and two ends of each of the three springs are welded with the screw sleeve (2-1) and the tightening joint (2-3).
9. The three-spring elastic shaft automatic feed screw tightening device according to claim 2, characterized in that: the lower section of the tightening joint (2-3) is a hexagonal prism and is matched with a sleeve of the electric wrench.
10. The three-spring elastic shaft automatic feed screw tightening device according to claim 8, characterized in that: the three springs form a compressible elastic shaft, and automatic axial feeding in the screw tightening process is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110216261.7A CN112975813B (en) | 2021-02-26 | 2021-02-26 | Three-spring elastic shaft automatic feeding screw tightening device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110216261.7A CN112975813B (en) | 2021-02-26 | 2021-02-26 | Three-spring elastic shaft automatic feeding screw tightening device |
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| Publication Number | Publication Date |
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| CN112975813A true CN112975813A (en) | 2021-06-18 |
| CN112975813B CN112975813B (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110216261.7A Active CN112975813B (en) | 2021-02-26 | 2021-02-26 | Three-spring elastic shaft automatic feeding screw tightening device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113681289A (en) * | 2021-09-10 | 2021-11-23 | 浙江贝力得机电股份有限公司 | Assembling device for hand-tightened drill chuck |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112975813B (en) | 2022-12-27 |
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