Mechanism capable of simultaneously executing circumferential rotation and axial movement
阅读说明:本技术 一种可同时执行周向旋转和轴向移动的机构 (Mechanism capable of simultaneously executing circumferential rotation and axial movement ) 是由 郑钦元 陈俊嘉 陈仁贤 于 2019-11-21 设计创作,主要内容包括:本发明提供了一种可同时执行周向旋转和轴向移动的机构,属于机械技术领域。它解决了现有的可同时旋转且轴向移动的机构轴向尺寸较大,安装不便且密封效果差的问题。本机构包括外转轴和通过键配合穿设于中心孔内的内转轴,内转轴的一端开有盲孔,盲孔内滑动连接有活塞,活塞杆的外端连接有液压旋转接头,液压旋转接头包括外筒体和转动连接于外筒体内并与活塞杆固连的芯轴,芯轴的一端具有同轴设置的密封盘,活塞杆的外端具有环形凸沿,密封盘与外转轴一端的端面同轴固连并封闭中心孔,环形凸沿与密封盘同轴设置,且环形凸沿的端面与密封盘的端面相贴合固连。本机构的整体长度更短,安装适应性更好,而且不易磨损和漏油,密封效果更好。(The invention provides a mechanism capable of simultaneously executing circumferential rotation and axial movement, and belongs to the technical field of machinery. The mechanism solves the problems that the existing mechanism capable of rotating and moving axially simultaneously is large in axial size, inconvenient to install and poor in sealing effect. This mechanism includes the outer pivot and wears to locate the downthehole adversion axle of central hole through the key cooperation, the one end of interior pivot is opened has the blind hole, sliding connection has the piston in the blind hole, the outer end of piston rod is connected with hydraulic rotary joint, hydraulic rotary joint includes outer barrel and rotates the dabber of connecting in outer barrel and linking firmly with the piston rod, the one end of dabber has the sealed dish of coaxial setting, the outer end of piston rod has the protruding edge of annular, sealed dish links firmly and seals the central hole with the terminal surface of outer pivot one end is coaxial, the protruding edge of annular sets up with sealed dish is coaxial, and the terminal surface on the protruding edge of annular is laminated mutually. The whole length of this mechanism is shorter, and installation adaptability is better, is difficult for wearing and tearing and oil leak moreover, and sealed effect is better.)
1. A mechanism capable of simultaneously executing circumferential rotation and axial movement comprises an outer rotating shaft (1) which can rotate and is provided with a center hole (11) and an inner rotating shaft (2) which is arranged in the center hole (11) in a penetrating mode in a key fit mode, and is characterized in that a blind hole (21) is formed in one end of the inner rotating shaft (2) in the axial direction, a piston (31) which enables the blind hole (21) to be separated into a first oil cavity (21a) and a second oil cavity (21b) is connected in the blind hole (21) in a sliding mode in the axial direction, a piston rod (32) is connected onto the piston (31), a first flow channel (32a) communicated with the first oil cavity (21a) and a second flow channel (32b) communicated with the second oil cavity (21b) are arranged on the piston rod (32), a hydraulic rotating joint (4) is connected to one end, far away from the piston (31), of the hydraulic rotating joint (4) is provided with a third flow channel (5) communicated with the first flow channel (32a) and a second flow 32b) The fourth runner (6) of intercommunication, hydraulic pressure rotary joint (4) include outer barrel (41) and rotate and connect in outer barrel (41) and with dabber (42) that piston rod (32) linked firmly, the one end of dabber (42) has sealed dish (42c) of coaxial setting, the outer end of piston rod (32) has annular protruding edge (32c), sealed dish (42c) link firmly and seal centre bore (11) with the coaxial laminating of the terminal surface of outward shaft (1) one end, annular protruding edge (32c) and sealed dish (42c) coaxial setting, just the terminal surface of annular protruding edge (32c) is laminated mutually with the terminal surface of sealed dish (42c) and is linked firmly.
2. The mechanism that can simultaneously perform circumferential rotation and axial movement according to claim 1, wherein the outer cylinder (41) has a cylindrical shape, the inner wall of the outer cylinder (41) is circumferentially provided with annular first and second oil grooves (41c, 41d), the first and second oil grooves (41c, 41d) are distributed at intervals in the axial direction of the outer cylinder (41), the outer wall of the outer cylinder (41) is provided with a first oil hole (41a) communicating with the first oil groove (41c) and a second oil hole (41b) communicating with the second oil groove (41d), the spindle (42) is provided with a first oil passage (42a) and a second oil passage (42b), one end of each of the first and second oil passages (42a, 42b) is located on the side wall of the spindle (42) and communicates with the first and second oil grooves (41c, 41d), respectively, the other ends of the first oil channel (42a) and the second oil channel (42b) are located on the end face of one end of the mandrel (42), the first oil hole (41a), the first oil groove (41c) and the first oil channel (42a) jointly form a third flow passage (5), and the second oil hole (41b), the second oil groove (41d) and the second oil channel (42b) jointly form a fourth flow passage (6).
3. The mechanism capable of simultaneously performing circumferential rotation and axial movement according to claim 2, wherein the annular flange (32c) is attached to the sealing disk (42c) and fixedly connected by a bolt, two annular grooves surrounding the first oil passage (42a) and the second oil passage (42b) are formed in the end surface of the sealing disk (42c), and the O-rings (7b) are embedded in the annular grooves.
4. The mechanism capable of simultaneously performing circumferential rotation and axial movement according to claim 3, wherein three sealing rings (7a) are arranged between the inner wall of the outer cylinder (41) and the outer wall of the mandrel (42), the sealing rings (7a) are arranged at intervals along the length direction of the mandrel (42), and the first oil groove (41c) and the second oil groove (41d) are respectively located between two adjacent sealing rings (7 a).
5. The mechanism capable of simultaneously performing circumferential rotation and axial movement according to claim 1 or 2, wherein the inner wall of the central hole (11) is fixedly provided with guide blocks (13) at intervals along the circumferential direction, the outer wall of the inner rotating shaft (2) is provided with a plurality of guide grooves (22) which correspond to the guide blocks (13) in a one-to-one and are in sliding fit, and the guide grooves (22) extend along the axial direction of the inner rotating shaft (2).
6. Mechanism capable of performing circumferential rotation and axial movement simultaneously as claimed in claim 5, characterized in that a transmission member (12) is sleeved and fixed on the outer rotating shaft (1), the transmission member (12) is a transmission gear or a belt pulley, and the guide block (13) is located on the inner wall of the outer rotating shaft (1) where the transmission member (12) is located.
7. Mechanism capable of performing both circumferential rotation and axial movement according to claim 2 or 3, characterized in that the end of the inner rotating shaft (2) provided with the blind hole (21) is located in the central hole (11) and spaced from the sealing disc (42c), the outer diameter of the sealing disc (42c) is larger than or equal to the outer diameter of the outer rotating shaft (1), and the outer diameter of the annular convex edge (32c) is smaller than the diameter of the central hole (11).
Technical Field
The invention belongs to the technical field of machinery, and relates to a mechanism capable of simultaneously executing circumferential rotation and axial movement.
Background
In the mechanical field, it is sometimes encountered that some mechanism is required to be able to achieve both circumferential rotation and axial movement. Because two driving sources are usually required to be simultaneously applied to the same rotating shaft in order to realize the two actions, the structure is complex, and the design difficulty is high.
The above-mentioned actions are achieved by a speed-reducing and stretching mechanism of a sizing mill with a rotary joint as disclosed in the chinese patent application (application No. 201520870169.2), which comprises a driving shaft sleeved with a transmission gear, a spline shaft extending into the driving shaft, a coupling connected to an output end of the spline shaft, and a piston rod for driving the spline shaft to stretch and stretch in the main shaft, wherein the piston rod is connected with the spline shaft through the rotary joint and the slender shaft. Therefore, the driving shaft is driven to rotate by the matching of an external power source and a transmission gear on the main shaft, the driving shaft drives the spline shaft to synchronously rotate through spline matching, and the piston rod can drive the spline shaft to move along the axial direction, so that the spline shaft can simultaneously realize circumferential rotation and axial movement. However, the piston cylinder of the structure needs to be arranged at the outer end parts of the driving shaft and the spline shaft, and the length of the piston cylinder is long, so that the sizing mill speed reduction telescopic mechanism occupies a large space, is easy to interfere in occasions with tight installation sizes, and brings great difficulty to design and installation.
The Chinese patent application (application number: 201820486320.6) discloses a rotary telescopic combined oil cylinder, which adopts a structure that a telescopic cylinder and a rotary cylinder are connected in series, a blind hole is arranged in a telescopic piston rod, the periphery of the wall of the blind hole is in transmission connection with a rotary transmission rod of the rotary cylinder through a spline, so that the rotary transmission rod can drive the telescopic piston rod to rotate, and the telescopic piston rod can move along the axial direction of the telescopic piston rod relative to the rotary transmission rod. Although this structure compares compactlyr with sizing mill speed reduction telescopic machanism, however, because the rotary cylinder can only provide limited rotary motion in rotary piston's stroke, it can't provide continuous unidirectional rotation like the motor, and application scope is less, and telescopic piston rod both will rotate relative telescopic cylinder body among this structure, and relative telescopic cylinder body is along axial displacement again, and the relative slip volume that leads to between telescopic piston rod and the telescopic cylinder body is great, and the frictional quantity between the two is great promptly, and the sealed degree of difficulty is great, the easy emergence is revealed of fluid.
Disclosure of Invention
The invention aims to solve the problems of the prior art and provides a mechanism capable of simultaneously executing circumferential rotation and axial movement, and the technical problems to be solved by the invention are as follows: how to make the mechanism that can carry out circumference rotation and axial displacement simultaneously more compact structure and sealed effect better.
The purpose of the invention can be realized by the following technical scheme: a mechanism capable of simultaneously executing circumferential rotation and axial movement comprises a rotatable outer rotating shaft with a center hole and an inner rotating shaft which is arranged in the center hole in a penetrating mode through key matching, and is characterized in that a blind hole is formed in one end of the inner rotating shaft in the axial direction, a piston which enables the blind hole to be separated into a first oil cavity and a second oil cavity is connected in the blind hole in a sliding mode in the axial direction, a piston rod is connected onto the piston, a first flow channel communicated with the first oil cavity and a second flow channel communicated with the second oil cavity are arranged on the piston rod, a hydraulic rotating joint is connected to one end, far away from the piston, of the piston rod, a third flow channel communicated with the first flow channel and a fourth flow channel communicated with the second flow channel are arranged on the hydraulic rotating joint, the hydraulic rotating joint comprises an outer cylinder body and a mandrel which is rotatably connected in the outer cylinder body and fixedly connected with the piston rod, the outer end of the piston rod is provided with an annular convex edge, the sealing disc is coaxially fixedly connected with the end face of one end of the outer rotating shaft and seals the center hole, the annular convex edge is coaxially arranged with the sealing disc, and the end face of the annular convex edge is fixedly connected with the end face of the sealing disc in a fit mode.
The outer rotating shaft of the invention can be connected with the driving piece in a transmission way to rotate, and the inner rotating shaft is connected with the outer rotating shaft in a matching way through a key, so that the inner rotating shaft can synchronously rotate along with the outer rotating shaft and simultaneously move along the axial direction relative to the outer rotating shaft. The blind hole is formed in the inner rotating shaft, the inner rotating shaft is matched with the piston and the piston rod to form a hydraulic cylinder, the piston rod is provided with a first flow channel and a second flow channel, the first flow channel and the second flow channel are used for driving the piston to move, the piston rod is connected with a hydraulic rotating joint arranged outside the outer rotating shaft, and the first flow channel and the second flow channel are communicated through the hydraulic rotating joint. Moreover, because the hydraulic cylinder structure is basically positioned in the outer rotating shaft, the axial length of the whole hydraulic cylinder structure can be designed to be shorter, and the hydraulic cylinder structure is convenient to be integrally applied to various positions with tight assembly space.
Meanwhile, the mandrel of the hydraulic rotary joint is fixedly connected with the piston rod and is fixedly connected with the end face of the outer rotating shaft at the same time, so that the mandrel, the piston rod and the outer rotating shaft form a whole, the mandrel, the piston rod and the outer rotating shaft can keep synchronous rotation, the rotation speed difference between the piston and the outer rotating shaft and the rotation speed difference between the piston and the piston rod are avoided, the friction of the piston and the piston rod caused by the rotation speed difference is avoided, the sealing effect of the hydraulic cylinder structure is better. Because the piston rod and the mandrel are fixedly connected with the sealing disc through the annular convex edge in a fit manner, the contact area between the mandrel and the piston rod is larger, the connection is more stable, the coaxiality is higher, the moving fit precision between the outer rotating shaft and the inner rotating shaft, between the piston and the inner rotating shaft and between the piston rod and the sealing cover is higher, the abrasion generated by relative sliding is less, and the sealing effect is better. In addition, the sealing disc of the mandrel seals the hydraulic cylinder structure in the central hole of the outer rotating shaft, and the hydraulic cylinder structure also plays a role in protection and dust prevention.
In the above mechanism capable of simultaneously performing circumferential rotation and axial movement, the outer cylinder is in a cylindrical shape, the inner wall of the outer cylinder is circumferentially provided with a first annular oil groove and a second annular oil groove, the first oil groove and the second oil groove are distributed along the axial direction of the outer cylinder at intervals, the outer wall of the outer cylinder is provided with a first oil hole communicated with the first oil groove and a second oil hole communicated with the second oil groove, the mandrel is provided with a first oil passage and a second oil passage, one ends of the first oil passage and the second oil passage are both located on the side wall of the mandrel and are respectively communicated with the first oil groove and the second oil groove, the other ends of the first oil passage and the second oil passage are both located on the end face of one end of the mandrel, the first oil hole, the first oil groove and the first oil passage form a third flow passage together, and the second oil hole, the second oil groove and the second oil passage form a fourth flow passage together. The outer cylinder of the hydraulic rotary joint is connected with an external oil circuit system, the outer cylinder is kept still when the outer rotating shaft rotates, the mandrel is connected with the piston rod and rotates synchronously along with the piston rod, the oil circuit between the mandrel and the outer cylinder is always communicated, and the external oil circuit realizes the control of axial expansion and contraction of the inner rotating shaft through the hydraulic rotary joint.
In foretell but simultaneous execution axial rotation and axial displacement's mechanism, the annular is protruding along laminating with sealed dish and link firmly through the bolt, it has two annular grooves that encircle first oil duct and second oil duct respectively to open on the terminal surface of sealed dish, all inlay in the annular groove and be equipped with O type circle to guarantee the sealed of oil circuit.
In foretell but simultaneous execution axial rotation and axial displacement's mechanism, be provided with three sealing washer between the inner wall of outer barrel and the outer wall of dabber, the sealing washer sets up along the length direction interval of dabber, first oil groove and second oil groove are located respectively between two adjacent sealing washers. Can guarantee the sealed effect of first oil groove and second oil groove like this, guarantee interior pivot along axial displacement's precision.
In the above mechanism capable of simultaneously performing axial rotation and axial movement, the inner wall of the central hole is fixedly provided with the guide blocks at intervals along the circumferential direction, the outer wall of the inner rotating shaft is provided with a plurality of guide grooves which correspond to the guide blocks one to one and are in sliding fit with the guide blocks, and the guide grooves extend along the axial direction of the inner rotating shaft. The guide block and the guide groove form the key fit, so that the outer rotating shaft can drive the inner rotating shaft to rotate, and meanwhile, the inner rotating shaft can move axially relative to the outer rotating shaft.
In the above mechanism capable of simultaneously performing axial rotation and axial movement, the outer rotating shaft is sleeved and fixed with a transmission member, the transmission member is a transmission gear or a belt pulley, and the guide block is located on the inner wall of the outer rotating shaft where the transmission member is located. The transmission part and the guide block are arranged on the outer rotating shaft at the same axial position basically, so that the torque of the transmission part driving the outer rotating shaft to rotate and the torque of the guide block driving the inner rotating shaft are basically the same at the axial position, the eccentric load generated between the outer rotating shaft and the inner rotating shaft is avoided, the coaxiality between the outer rotating shaft and the inner rotating shaft is higher, and the relative sliding is smoother.
In the above mechanism capable of simultaneously performing axial rotation and axial movement, the end of the inner rotating shaft, at which the blind hole is formed, is located in the central hole and has a distance from the sealing disc, the outer diameter of the sealing disc is greater than or equal to the outer diameter of the outer rotating shaft, and the outer diameter of the annular convex edge is smaller than the aperture of the central hole.
Compared with the prior art, the invention has the following advantages:
1. the structure of the invention is compact, the outer rotating shaft is connected with the inner rotating shaft through a key, a hydraulic cylinder structure is arranged between the inner rotating shaft and the outer rotating shaft and is positioned in the outer rotating shaft, so that the hydraulic cylinder structure can drive the inner rotating shaft to move along the axial direction, and simultaneously, the axial length of the structure is shortened as much as possible, and the structure has wider applicability.
2. The mandrel of the hydraulic rotary joint is provided with a sealing disc, the sealing disc is attached and fixed to the end face of the outer rotating shaft and seals the inner rotating shaft and the hydraulic cylinder structure in a center hole, and meanwhile, the piston rod is fixedly connected with the sealing disc through the annular convex edge, so that the piston rod, the piston, the inner rotating shaft, the outer rotating shaft and the mandrel can keep synchronous rotation, abrasion of all parts due to rotation speed difference is avoided, and sealing performance is guaranteed.
3. The present case structure is ingenious, sets up first runner and second runner on the piston rod to through hydraulic pressure rotary joint and outside hydraulic system intercommunication, make the piston rod can guarantee hydraulic system to the stable control of internal rotating shaft axial displacement when following outer pivot and internal rotating shaft pivoted.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic of a hydraulic cylinder configuration;
FIG. 3 is a schematic view of a hydraulic swivel;
fig. 4 is a cross-sectional view taken at a-a in fig. 1.
In the figure, 1, an outer rotating shaft; 11. a central bore; 12. a transmission member; 13. a guide block; 2. an inner rotating shaft; 21. blind holes; 21a, a first oil chamber; 21b, a second oil chamber; 22. a guide groove; 31. a piston; 32. a piston rod; 32a, a first flow passage; 32b, a second flow channel; 32c, an annular convex edge; 33. a sealing cover; 4. a hydraulic swivel joint; 41. an outer cylinder; 41a, a first oil hole; 41b, a second oil hole; 41c, a first oil groove; 41d, a second oil groove; 42. a mandrel; 42a, a first oil passage; 42b, a second oil passage; 42c, sealing disc; 5. a third flow path; 6. a fourth flow path; 7a, a sealing ring; 7b and an O-shaped ring.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 and 2, a mechanism capable of simultaneously performing circumferential rotation and axial movement comprises an outer
Specifically, as shown in fig. 1 to 3, a bearing and a
As shown in fig. 1 to 3, a
Furthermore, the end face of the
Further, three sealing
As shown in fig. 4, the inner wall of the
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although the terms
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