Worm and gear transmission structure on automatic tool changing mechanism

Abstract

The utility model is applicable to the technical field of numerical control machine tools, and provides a worm gear and worm transmission structure on an automatic tool changing mechanism, which comprises a casing, a worm driven by a motor is rotatably mounted in the casing, a worm gear is rotatably mounted in the casing through a bearing seat, and the worm gear is in transmission connection with the worm gear. Meanwhile, a threaded rod is in threaded connection with the interior of the worm gear through a threaded hole, the worm gear is driven to rotate through worm transmission, the threaded rod is driven to ascend and descend, a driving shaft is driven to ascend and descend through ascending and descending of the threaded rod, and then tool pulling operation is conducted; the driving motor drives the threaded rod to rotate through the second bevel gear, the threaded rod and the worm gear rotate synchronously, then the threaded rod rotates, the driving shaft is driven to rotate, the cutter is replaced, the transmission efficiency is higher, and use is more convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of numerical control machine tools, and in particular relates to a worm gear transmission structure on an automatic tool changing mechanism. Background Art

[0002] In the current field of CNC machine tool technology, the tool holder is the most common auxiliary device of CNC machine tools. It allows CNC machine tools to complete multiple or even all processing steps in one clamping of the workpiece, thereby shortening the auxiliary processing time and reducing the errors caused by multiple installations of the workpiece during the processing, thereby improving the processing efficiency and processing accuracy of the machine tool. The tool changing mechanism needs to use a drive mechanism to drive the drive shaft to extend and rotate, and then replace the CNC tool.

[0003] The utility model patent with the authorization announcement number CN208322818U discloses a tool-changing shaft transmission device for an automatic tool-changing mechanism, which utilizes two motor devices to respectively drive two axially connected transmission shafts for rotation and up and down reciprocating displacement. It is low-cost and has high transmission accuracy. It includes a housing with a transmission mounting cavity built into the housing; a first transmission shaft, which is specifically a screw structure; a second transmission shaft, the upper end of which is connected to the bottom of the first transmission shaft via a second connecting portion, the second transmission shaft being arranged on the extension line of the working axis of the first transmission shaft, the second connecting portion being specifically an axial sleeve arranged axially along the upper portion of the second transmission shaft, the bottom of the first transmission shaft being connected to the upper portion of the second connecting portion via a connecting bearing, and the upper portion of the second transmission shaft being fixedly connected to the inner cavity of the second connecting portion; a first motor device, which is transmission-connected to the first connecting portion of the first transmission shaft; and a second motor device.

[0004] However, the above patents have the following shortcomings:

[0005] In the above patent, two motor devices are used to drive two axially connected transmission shafts respectively so as to rotate and move back and forth up and down. However, it can be seen from the figure that the first motor and the second motor both transmit the transmission shaft through belts or the like. The belt transmission has elastic sliding and slipping, the transmission efficiency is low, and the accurate transmission ratio cannot be maintained. It is also inconvenient to lubricate it, the frequency of maintenance and replacement is high, the service life is short, and the use cost of the tool changing mechanism is increased. Utility Model Content

[0006] The utility model provides a worm gear transmission structure on an automatic tool changing mechanism, which aims to solve the problems mentioned in the above background, such as elastic sliding and slipping of belt transmission, low transmission efficiency, inconvenience in lubrication, high frequency of maintenance and replacement, short service life, and increased cost of using the tool changing mechanism.

[0007] The utility model is implemented as follows: a worm gear transmission structure on an automatic tool changing mechanism includes a housing;

[0008] a transmission assembly mounted on the housing, the transmission assembly comprising a worm, the worm being rotatably mounted inside the housing;

[0009] A reduction motor is fixedly mounted on the outer wall of the housing, and the output end of the reduction motor is connected to the worm through a coupling;

[0010] A worm gear is rotatably mounted inside the housing via a bearing seat, and the worm gear is transmission-connected to the worm;

[0011] The interior of the worm wheel is threadedly connected with a threaded rod through a threaded hole, and a driving shaft is detachably mounted on the lower end of the threaded rod.

[0012] Preferably, through holes are provided at both upper and lower ends of the housing, and both upper and lower ends of the threaded rod pass through the corresponding through holes;

[0013] The inner walls of the two through holes are both embedded with sealing gaskets; in this solution, the threaded rod is easily passed through, and the sealing gaskets improve the sealing performance of the through holes and reduce the entry of external dust.

[0014] Preferably, a limit block is fixedly installed on the upper end of the threaded rod, and a bevel gear is fixedly installed on the outer wall of the threaded rod; in this solution, the limit block is detachably connected to the threaded rod, and the diameter of the limit block is larger than the diameter of the through hole to prevent the threaded rod from falling off.

[0015] Preferably, a driving motor is fixedly mounted on the upper surface of the casing, and a bevel gear 2 is mounted on the output end of the driving motor, which cooperates with the bevel gear 1; in this solution, the bevel gear 2 is engaged with the bevel gear 1 that falls to the predetermined position, and the driving motor drives the bevel gear 2 to rotate, and the gear transmission is used to drive the threaded rod to rotate.

[0016] Preferably, an annular baffle is fixedly mounted on the outer wall of the threaded rod;

[0017] A support ring is fixedly mounted on the upper surface of the housing, the support ring is sleeved on the outer wall of the threaded rod, a plurality of support springs are fixedly mounted on the outer wall of the support ring, and a shock-absorbing ring is fixedly mounted on the upper surfaces of the plurality of support springs;

[0018] The shock-absorbing ring is arranged below the baffle. In this solution, when the threaded rod descends, the baffle is driven to descend, and the baffle squeezes the shock-absorbing ring, thereby squeezing multiple support springs. The elasticity of the multiple support springs is used to slow down the vibration of the threaded rod when it descends, thereby facilitating the engagement of bevel gear one and bevel gear two.

[0019] Preferably, an oil storage tank is embedded in the housing, and an elastic oil storage bag is provided at the lower end of the oil storage tank, and the oil storage bag is arranged inside the housing;

[0020] An oil drain pipe is installed at the lower end of the oil storage bag, and the oil drain pipe is arranged above the worm. An extrusion block is fixedly installed on the worm wheel. In this solution, the lubricating oil is stored in the oil tank. When the extrusion block rotates, the oil storage bag is squeezed, and the lubricating oil is discharged from the oil drain pipe and drips onto the worm to lubricate the worm and the turbine.

[0021] Compared with the prior art, the beneficial effects of the present invention are: the worm gear transmission structure on the automatic tool changing mechanism of the present invention is

[0022] 1. A worm driven by a motor is installed for rotation inside the casing. A worm wheel is installed for rotation inside the casing using a bearing seat. The worm wheel is connected to the worm wheel through a transmission. At the same time, a threaded rod is threadedly connected to the worm wheel through a threaded hole. The worm wheel is driven by the worm gear to rotate, which drives the threaded rod to rise and fall. The lifting of the threaded rod drives the drive shaft to rise and fall, thereby performing a knife-pulling operation. A bevel gear 1 is installed on the threaded rod. When the threaded rod moves to the bottom, the drive motor drives the threaded rod to rotate using the bevel gear 2, so that the threaded rod and the worm wheel rotate synchronously, thereby rotating the threaded rod and driving the drive shaft to rotate, thereby replacing the tool. The transmission efficiency is higher and the use is more convenient.

[0023] 2. An oil storage tank is installed on the casing, and an elastic oil storage bag is set at the bottom of the oil storage tank. When the worm gear rotates, it drives the extrusion block to rotate. When the extrusion block rotates, it squeezes the oil storage bag, so that the lubricating oil inside is discharged from the oil drain pipe and squeezed onto the worm, lubricating the worm and worm gear, thereby extending the service life of this structure;

[0024] 3. An annular support ring is fixedly installed on the casing, and multiple support springs are installed on the support ring. A shock-absorbing ring is fixedly installed on the multiple support springs. When the threaded rod descends, the baffle is used to squeeze the shock-absorbing ring to reduce the vibration of the threaded rod, making it easier for bevel gear one to contact bevel gear two. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the overall structure of this utility

[0026] Figure 2 A top view of the worm gear in this application

[0027] Figure 3 Practical Figure 1 Enlarged view of point A in the middle

[0028] In the picture:

[0029] 1. Casing; 11. Through hole; 12. Sealing gasket;

[0030] 2. Transmission assembly; 21. Worm; 22. Reducer motor; 23. Worm gear; 231. Extrusion block; 232. Bearing seat; 24. Threaded rod; 241. Bevel gear 1; 242. Baffle; 243. Stop block; 25. Drive shaft; 26. Drive motor; 261. Bevel gear 2; 27. Support ring; 271. Support spring; 272. Shock absorber ring;

[0031] 3. Oil storage tank; 31. Oil storage bag; 32. Oil drain pipe. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0033] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention.

[0034] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] See also Figure 1-3The utility model provides a technical solution: a worm gear transmission structure on an automatic tool changing mechanism, including a casing 1, a transmission assembly 2, which is installed on the casing 1, the transmission assembly 2 includes a worm 21, the worm 21 is rotatably installed inside the casing 1, a reduction motor 22 is fixedly installed on the outer wall of the casing 1, the output end of the reduction motor 22 is connected to the worm 21 through a coupling, a worm wheel 23 is rotatably installed inside the casing 1 through a bearing seat 232, the worm wheel 23 is connected to the worm 21, the inside of the worm wheel 23 is threadedly connected to a threaded rod 24 through a threaded hole, and the lower end of the threaded rod 24 is detachably mounted with a drive shaft 25.

[0038] Among them, the reduction motor 22 drives the worm 21 to rotate through the coupling, thereby driving the worm wheel 23 to rotate. The worm wheel 23 uses its own threaded hole to drive the threaded rod 24 to move longitudinally, thereby adjusting the longitudinal position of the drive shaft 25, and clamping and pulling out the knife handle through the knife arm on the drive shaft 25.

[0039] Through holes 11 are formed at both upper and lower ends of the housing 1 . The upper and lower ends of the threaded rod 24 pass through the corresponding through holes 11 . Sealing gaskets 12 are embedded in the inner walls of the two through holes 11 .

[0040] The threaded rod 24 moves longitudinally in the two through holes 11 , and the sealing gasket 12 improves the sealing performance of the two through holes 11 , thereby reducing the entry of external dust into the housing 1 .

[0041] A limit block 243 is fixedly installed on the upper end of the threaded rod 24, a bevel gear 1 241 is fixedly installed on the outer wall of the threaded rod 24, a drive motor 26 is fixedly installed on the upper surface of the casing 1, and a bevel gear 2 261 that matches the bevel gear 1 241 is installed on the output end of the drive motor 26.

[0042] Furthermore, when the threaded rod 24 descends to the bottom, bevel gear 1 241 and bevel gear 2 261 engage with each other, and the drive motor 26 uses gear transmission to drive bevel gear 1 241 to rotate, thereby driving the threaded rod 24 to rotate. The drive motor 26 and the reduction motor 22 are controlled by a synchronous controller so that the rotation speed of the threaded rod 24 is consistent with that of the worm gear 23. The threaded rod 24 and the worm gear 23 rotate simultaneously as a whole, thereby driving the drive shaft 25 to rotate, driving the tool arm to rotate, and replacing the tool. The drive motor 26 and the reduction motor 22 rotate in opposite directions to reset the drive shaft 25 and lift the threaded rod 24, so that the bevel gear 1 241 and the bevel gear 2 261 are separated.

[0043] An annular baffle 242 is fixedly installed on the outer wall of the threaded rod 24, and a support ring 27 is fixedly installed on the upper surface of the casing 1. The support ring 27 is sleeved on the outer wall of the threaded rod 24. A plurality of support springs 271 are fixedly installed on the outer wall of the support ring 27. A shock-absorbing ring 272 is fixedly installed on the upper surface of the plurality of support springs 271. The shock-absorbing ring 272 is arranged below the baffle 242.

[0044] Specifically, when the threaded rod 24 descends, the annular baffle 242 descends, squeezing the shock-absorbing ring 272, and then squeezing the multiple support springs 271. The elasticity of the multiple support springs 271 themselves is used to slow down the vibration of the baffle 242 when it descends, thereby facilitating the engagement of bevel gear 1 241 and bevel gear 2 261, and preventing damage to bevel gear 1 241 and bevel gear 2 261.

[0045] An oil storage tank 3 is embedded in the casing 1, and an elastic oil storage bag 31 is provided at the lower end of the oil storage tank 3. The oil storage bag 31 is arranged inside the casing 1. An oil drain pipe 32 is installed at the lower end of the oil storage bag 31. The oil drain pipe 32 is arranged above the worm 21, and an extrusion block 231 is fixedly installed on the worm gear 23.

[0046] It should be noted that the lubricating oil is stored in the oil storage tank 3, and a tank cover is installed on the oil storage tank 3 to facilitate the injection of lubricating oil into the oil storage tank 3. The lubricating oil flows into the oil storage bag 31. When the worm gear 23 rotates, it drives the squeezing block 231 to rotate. The squeezing block 231 contacts the oil storage bag 31, squeezing the lubricating oil inside, so that the lubricating oil is discharged through the oil drain pipe 32 and sprinkled on the worm 21 to lubricate the worm 21 and the worm gear 23.

[0047] The working principle and use process of this utility model: please refer to Figure 1-3 The reduction motor 22 drives the worm 21 to rotate through the coupling, thereby driving the worm wheel 23 to rotate. The worm wheel 23 uses its own threaded hole to drive the threaded rod 24 to move longitudinally, thereby adjusting the longitudinal position of the drive shaft 25. The knife handle is clamped and pulled out by the knife arm on the drive shaft 25. When the threaded rod 24 drops to the bottom, the bevel gear 1 241 is meshed with the bevel gear 2 261. The drive motor 26 uses the gear transmission to drive the bevel gear 1 241 to rotate, driving the threaded rod 24 to rotate. The drive motor 26 and the reduction motor 22 are controlled by a synchronous controller. The rotation speed of the threaded rod 24 is consistent with that of the worm gear 23, thereby driving the drive shaft 25 to rotate, driving the knife arm to rotate, and replacing the knife. The drive motor 26 and the reduction motor 22 rotate in opposite directions to reset the drive shaft 25 and raise the threaded rod 24 to separate the bevel gear 1 241 from the bevel gear 2 261. When the worm gear 23 rotates, it drives the extrusion block 231 to rotate. The extrusion block 231 contacts the oil storage bag 31, squeezing the lubricating oil inside, so that the lubricating oil is discharged through the oil drain pipe 32 and falls on the worm 21, lubricating the worm 21 and the worm gear 23.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A worm gear transmission structure on an automatic tool changing mechanism, characterized in that: comprising a housing (1); A transmission assembly (2) is mounted on the housing (1), the transmission assembly (2) comprising a worm (21), the worm (21) being rotatably mounted inside the housing (1); A reduction motor (22) is fixedly mounted on the outer wall of the housing (1), and the output end of the reduction motor (22) is connected to the worm (21) via a coupling. A worm wheel (23) is rotatably mounted inside the housing (1) via a bearing seat (232), and the worm wheel (23) is transmission-connected to the worm (21); The interior of the worm wheel (23) is threadedly connected to a threaded rod (24) through a threaded hole, and a driving shaft (25) is detachably mounted on the lower end of the threaded rod (24).

2. The worm gear transmission structure of the automatic tool changing mechanism according to claim 1, characterized in that: The upper and lower ends of the housing (1) are both provided with through holes (11), and the upper and lower ends of the threaded rod (24) both pass through the corresponding through holes (11); The inner walls of the two through holes (11) are both embedded with sealing gaskets (12).

3. The worm gear transmission structure of the automatic tool changing mechanism according to claim 1, characterized in that: A limit block (243) is fixedly mounted on the upper end of the threaded rod (24), and a bevel gear 1 (241) is fixedly mounted on the outer wall of the threaded rod (24).

4. The worm gear transmission structure of the automatic tool changing mechanism according to claim 3, characterized in that: A driving motor (26) is fixedly mounted on the upper surface of the housing (1), and a second bevel gear (261) matching the first bevel gear (241) is mounted on the output end of the driving motor (26).

5. The worm gear transmission structure of the automatic tool changing mechanism according to claim 1, characterized in that: An annular baffle (242) is fixedly mounted on the outer wall of the threaded rod (24); A support ring (27) is fixedly mounted on the upper surface of the housing (1), the support ring (27) being sleeved on the outer wall of the threaded rod (24), a plurality of support springs (271) being fixedly mounted on the outer wall of the support ring (27), and a shock-absorbing ring (272) being fixedly mounted on the upper surfaces of the plurality of support springs (271); The shock-absorbing ring (272) is arranged below the baffle (242).

6. The worm gear transmission structure of the automatic tool changing mechanism according to claim 1, characterized in that: An oil storage tank (3) is embedded in the housing (1), an elastic oil storage bag (31) is provided at the lower end of the oil storage tank (3), and the oil storage bag (31) is provided inside the housing (1); An oil drain pipe (32) is installed at the lower end of the oil storage bag (31), and the oil drain pipe (32) is arranged above the worm (21). An extrusion block (231) is fixedly installed on the worm wheel (23).

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