Synchronous servo tailstock structure and tiny modulus gear machine

Abstract

The synchronous servo tailstock structure comprises an auxiliary main shaft, a first driving assembly and a second driving assembly, the first driving assembly comprises a lead screw, a shaft sleeve, a first driving piece, a bearing sleeve and a connecting shaft, and the connecting shaft is connected to the auxiliary main shaft, can be fixed to the bearing sleeve in the radial direction and can rotate relative to the bearing sleeve in the axial direction; the second driving assembly comprises a third belt wheel fixedly arranged on the auxiliary main shaft in a sleeving mode and a second belt used for being connected between the output end of a second driving part and the third belt wheel to achieve rotation transmission of the third belt wheel, and the second driving part is used for driving the main shaft to rotate. Preferably, a connecting assembly is arranged between the lead screw and the bearing and comprises a nut fixed to a bearing sleeve of the bearing and a first screw used for connecting the lead screw and the nut. Axial movement of the auxiliary main shaft is controlled by the lead screw, circumferential movement of the auxiliary main shaft is driven by the driving piece of the main shaft, the structure is simple, and stroke control precision is high.

Description

Technical Field

[0001] The invention belongs to the technical field of micro-module gear machines, and in particular relates to a synchronous servo tailstock structure and a micro-module gear machine. Background Art

[0002] At present, the tailstock drive of micro-modulus gear machines includes variable speed gear drive, cylinder pneumatic drive and servo motor drive. Among them, cylinder pneumatic drive has been widely used due to its simple structure, easy maintenance and relatively low cost; however, this method will produce greater impact during operation and low stroke accuracy. Summary of the invention

[0003] In order to solve the problems of complex tailstock driving structure and low travel accuracy of the existing micro-modulus gear machine, the present invention proposes a synchronous servo tailstock structure and a micro-modulus gear machine.

[0004] The objective of the present invention is achieved through the following technical solutions: The first aspect of the present invention discloses a synchronous servo tailstock structure, comprising a sub-spindle, a first drive assembly for driving the sub-spindle to move axially, and a second drive assembly for driving the sub-spindle to move circumferentially. The first driving assembly includes a screw, a sleeve sleeved outside the screw, a first driving member for driving the sleeve to rotate, a bearing sleeve fixedly connected to one end of the screw, and a connecting shaft connected to the secondary spindle and radially fixed to the bearing sleeve and axially rotatable relative to the bearing sleeve; The second driving assembly includes a third pulley fixedly mounted on the secondary main shaft, and a second belt connected between an output end of a second driving member and the third pulley to realize rotation transmission of the third pulley. The second driving member is a driving member for driving the main shaft to rotate.

[0005] Preferably, a connecting assembly is provided between the screw rod and the bearing, and the connecting assembly comprises a nut fixed on a bearing sleeve of the bearing and a first screw for connecting the screw rod and the nut.

[0006] Preferably, a second screw is fixed to one end of the connecting shaft connected to the bearing sleeve, the diameter of the nut of the second screw is larger than the inner diameter of the bearing shaft placed in the bearing sleeve, and a limiting convex ring is provided on the connecting shaft, and the limiting convex ring and the nut of the second screw are respectively placed at both ends of the bearing shaft.

[0007] Preferably, the first driving member includes a servo motor, a first pulley fixed to the output shaft of the servo motor, a second pulley fixed to the screw rod, and a first belt sleeved between the first pulley and the second pulley.

[0008] Preferably, the driving member is a motor.

[0009] The second aspect of the present invention discloses a micro-modulus gear machine, comprising: Spindle; A driving member for driving the main shaft to rotate, wherein a fourth pulley is fixed on the output shaft of the driving member; In the synchronous servo tailstock structure described in the first aspect and any possible design thereof, the fourth pulley is drivingly connected to the third pulley via a second belt.

[0010] The beneficial effects of the present invention are: The axial movement of the sub-spindle of the synchronous servo tailstock structure of the present invention is controlled by a screw rod, and the circumferential movement is driven by a driving member of the main shaft. It has not only a simple structure but also high stroke control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 It is a structural schematic diagram of the first state of the synchronous servo tailstock structure of the present invention; Figure 2 It is a structural schematic diagram of the second state of the synchronous servo tailstock structure of the present invention.

[0013] Among them, in the figure, 1- Sub-spindle; 21-screw rod, 22-shaft sleeve, 23-connecting shaft, 231-second screw; 232-limiting convex ring; 24-bearing sleeve; 241-nut; 242-first screw; 251-servo motor; 252-first pulley; 253-second pulley; 254-first belt; 31- the third pulley, 32- the second belt. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0017] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] A first aspect of the present invention discloses a synchronous servo tailstock structure, comprising a sub-spindle 1, a first drive assembly for driving the sub-spindle 1 to move axially, and a second drive assembly for driving the sub-spindle 1 to move circumferentially.

[0021] like Figure 1 , 2As shown, the first driving assembly includes a screw 21, a sleeve 22, a first driving member, a bearing, and a connecting shaft 23, wherein the secondary main shaft 1, the connecting shaft 23, the bearing sleeve, and the screw 21 are connected in sequence. The sleeve 22 is fixedly mounted outside the screw 21, and the first driving member is used to drive the sleeve 22 to rotate. The bearing sleeve 24 is fixedly connected to one end of the screw 21; the connecting shaft 23 is connected between the secondary main shaft 1 and the bearing sleeve, wherein one end of the connecting shaft 23 is fixedly connected to the secondary main shaft 1, and the other end is connected to the bearing sleeve 24, and is radially fixed with the bearing sleeve and can rotate relative to the bearing sleeve in the axial direction, that is, the connecting shaft 23 can achieve axial synchronous movement with the screw 21 under the action of the bearing sleeve, and can also rotate relative to the screw 21 in the circumferential direction.

[0022] With this structure, the sleeve 22 can be driven to rotate by driving the screw 21 to rotate, thereby driving the screw to rotate and realize axial movement relative to the sleeve 22, and then realizing axial movement of the secondary spindle 1 under the transmission action of the bearing sleeve 24 and the connecting shaft 23 in sequence.

[0023] The second driving assembly includes a third pulley 31 fixedly mounted on the secondary spindle 1, and a second belt 32 connected between the output end of the second driving member and the third pulley 31 to realize the rotation transmission of the third pulley 31. The second driving member is a driving member for driving the main shaft to rotate. The circumferential motion of the secondary spindle 1 directly adopts the driving member for the rotation of the main shaft, and the intermediate transmission is realized through the third pulley 31 and the second belt 32.

[0024] The synchronous servo tailstock structure adopts the above structure, and is controlled by a screw rod and a belt drive in the axial and radial directions respectively. Its manufacturing cost is relatively low, and it can control the stroke of the tailstock more accurately. The radial transmission is directly realized by the existing spindle drive structure, which further reduces the cost.

[0025] There are many ways to connect the screw rod 21 and the bearing sleeve 24. In order to further facilitate maintenance and installation, a connecting assembly is provided between the screw rod 21 and the bearing, and the connecting assembly includes a nut 241 fixed on the bearing sleeve of the bearing, and a first screw 242 for connecting the screw rod 21 and the nut 241. The screw rod 21 is a hollow structure, and a limiting ring is provided in one end connected to the nut 241 to abut against the nut of the first screw 242 for limiting position.

[0026] There are many ways to connect the connecting shaft 23 to the bearing sleeve. For example, the connecting shaft can be directly fixedly connected to the bearing shaft in the bearing sleeve. In order to further facilitate maintenance and installation, a second screw 231 can be fixed at one end of the connecting shaft 23 connected to the bearing sleeve. The diameter of the nut of the second screw 231 is larger than the inner diameter of the bearing shaft placed in the bearing sleeve, and a limiting convex ring 232 is provided on the connecting shaft 23. The limiting convex ring 232 and the nut of the second screw 231 are respectively placed at both ends of the bearing shaft.

[0027] The first driving member drives the screw to rotate, thereby realizing the axial movement control of the sub-spindle. There are many ways to achieve this. In order to reduce vibration and noise, such as Figure 1 As shown, the first driving member includes a servo motor 251 , a first pulley 252 fixed on the output shaft of the servo motor 251 , a second pulley 253 fixed on the screw rod 21 , and a first belt 254 sleeved between the first pulley 252 and the second pulley 253 .

[0028] Using any of the above structures of synchronous servo tailstock structure, refer to Figure 1 , 2 The servo motor works, and under the transmission of the first pulley, the first belt, and the second pulley, the sleeve is driven to rotate, thereby controlling the axial movement of the screw. While the screw is moving axially, it drives the nut, the connecting shaft, and the sub-spindle to move axially in turn. The schematic diagrams of the sub-spindle in the left limit position and the right limit position are shown in Figure 1. Figure 1 , 2 shown.

[0029] Based on the synchronous servo tailstock structure of any of the above-mentioned structures, the second aspect of the present invention discloses a micro-modulus gear machine, comprising a main shaft, a driving member and the synchronous servo tailstock structure of the first aspect, wherein the driving member is used to drive the main shaft to rotate, and a fourth pulley is fixed on the output shaft of the driving member; the fourth pulley is connected to the third pulley 31 through a second belt 32.

[0030] It should be noted that the structure of the main shaft and the driving member in this solution is the prior art, and therefore is not shown in the diagram of this solution.

[0031] The above-mentioned micro-modulus gear machine can be used for processing small-modulus cylindrical gears, bevel gears, worm gears and other types of workpieces in industries such as small medical equipment, small / micro reducers, clocks, drones, instruments and meters, micro motors, micro engraving machines, model airplanes, office machinery, toys and power tools.

[0032] Under the premise of adopting reasonable cutting specifications, using high-precision hobs, fixtures and gear blanks, and implementing GB / T10095-2008 standards, the following accuracy indicators can be achieved: ① When precision cutting, the spur / helical cylindrical gears with GB6 precision can be produced, where m≤0.5mm for steel parts, m≤0.8mm for copper parts, and the tooth surface roughness is Ra 1.6μm; ② When processing in batches with high efficiency, spur / helical cylindrical gears with GB7 level precision can be produced, where m≤0.5mm for steel parts, m≤0.8mm for copper parts, and tooth surface roughness is Ra 1.6~3.2μm; ③ Under the same conditions, the radial method can be used to machine worm gears with the same accuracy as cylindrical gears.

[0033] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A synchronous servo tailstock structure, comprising a sub-spindle (1), a first drive assembly for driving the sub-spindle (1) to move axially, and a second drive assembly for driving the sub-spindle (1) to move circumferentially, characterized in that: The first driving assembly comprises a screw (21), a sleeve (22) sleeved outside the screw (21), a first driving member for driving the sleeve (22) to rotate, a bearing sleeve (24) fixedly connected to one end of the screw (21), and a connecting shaft (23) connected to the secondary main shaft (1) and capable of being radially fixed to the bearing sleeve and axially rotatable relative to the bearing sleeve; The second driving component comprises a third pulley (31) fixedly mounted on the secondary main shaft (1), and a second belt (32) used for connecting between an output end of a second driving member and the third pulley (31) to realize rotational transmission of the third pulley (31); the second driving member is a driving member used for driving the main shaft to rotate.

2. A synchronous servo tailstock structure according to claim 1, characterized in that: A connecting assembly is provided between the screw rod (21) and the bearing, the connecting assembly comprising a nut (241) fixed on a bearing sleeve of the bearing, and a first screw (242) used to connect the screw rod (21) and the nut (241).

3. A synchronous servo tailstock structure according to claim 1, characterized in that: A second screw (231) is fixed to one end of the connecting shaft (23) connected to the bearing sleeve, the diameter of the nut of the second screw (231) is larger than the inner diameter of the bearing shaft placed in the bearing sleeve, and a limiting convex ring (232) is provided on the connecting shaft (23), and the limiting convex ring (232) and the nut of the second screw (231) are respectively placed at two ends of the bearing shaft.

4. A synchronous servo tailstock structure according to claim 1, characterized in that: The first driving member comprises a servo motor (251), a first pulley (252) fixed on an output shaft of the servo motor (251), a second pulley (253) fixed on the screw rod (21), and a first belt (254) sleeved between the first pulley (252) and the second pulley (253).

5. The synchronous servo tailstock structure according to claim 1, characterized in that: The driving member is a motor.

6. A micro-modulus gear machine, characterized in that: include: Spindle; A driving member for driving the main shaft to rotate, wherein a fourth pulley is fixed on the output shaft of the driving member; The synchronous servo tailstock structure according to any one of claims 1 to 5, wherein the fourth pulley is transmission-connected to the third pulley (31) via a second belt (32).

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