Cam transmission mechanism of machining lathe

Abstract

The utility model relates to the technical field of machining lathes, and discloses a cam transmission mechanism of a machining lathe, which comprises a screw rod, a pillow seat is sleeved on the screw rod in a threaded manner, a ram is mounted on the pillow seat and arranged on the lathe, a spline shaft is coaxially arranged at the end part of the screw rod, and the end part of the spline shaft is provided with a cam shaft. A rotating shaft is coaxially installed at the end, away from the lead screw, of the spline shaft, a motor is installed at the end of the rotating shaft, the rotating shaft is rotationally sleeved with a support through a bearing, and the support is installed on a lathe. The lead screw and the spline shaft are connected through an overload clutch mechanism. A cam transmission mechanism of a machining lathe solves the problems that in the prior art, when a cutter is abraded, the cutting effect of the cutter is poor, when a ram slides according to the running speed of a hydraulic cylinder, the abraded cutter can seriously affect the cutting speed of the cutter, and then the cutter is prone to being clamped when the ram runs. And both the motor and the hydraulic cylinder are damaged.

Description

Technical Field

[0001] This utility model relates to the field of machining lathe technology, specifically to a cam transmission mechanism for a machining lathe. Background Technology

[0002] Machining refers to the process of machining workpieces using CNC machine tools such as machining centers and CNC lathes, and using different cutting tools. Among them, the lathe is one of the most basic machining equipment. It is a machine tool that mainly rotates the workpiece. The workpiece is fixed on the spindle, and the rotation drives the cutting tool to cut it to form the required geometric shape. The transmission mechanism is the foundation of the lathe's operation, ensuring that all parts of the lathe can work in a coordinated and accurate manner.

[0003] In machining, the movement trajectory and cutting depth of the cutting tool are generally controlled by CNC programs to achieve the purpose of machining the workpiece. Therefore, lathes are generally controlled by CNC. In the existing technology, the ram is the main structure of the lathe. During the machining process, it needs to run continuously to drive the tool to process the workpiece. The ram's operation is mostly powered by hydraulic cylinders. When the tool wears, its cutting effect is poor. When the ram slides according to the running speed of the hydraulic cylinder, the worn tool will seriously affect its cutting speed. As a result, tool jamming is likely to occur when the ram is running, which will damage the motor and hydraulic cylinder. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a cam transmission mechanism for a machining lathe, which solves the problems mentioned in the background.

[0005] This utility model provides the following technical solution: a cam transmission mechanism for a machining lathe, comprising: a lead screw, a bolster threaded on the lead screw, a slide ram mounted on the bolster and disposed on the lathe, a splined shaft coaxially disposed at the end of the lead screw, a rotating shaft coaxially disposed at the end of the splined shaft away from the lead screw, a motor mounted at the end of the rotating shaft, and a bracket rotatably disposed on the rotating shaft via a bearing, the bracket being mounted on the lathe;

[0006] The lead screw and the spline shaft are connected by an overload clutch mechanism. A pressing mechanism is slidably sleeved on the spline shaft. A shifting mechanism is provided inside the bracket. The pressing mechanism and the rotating shaft are driven by the shifting mechanism.

[0007] Preferably, the overload clutch mechanism includes a first end face gear installed at the end of the lead screw, a second end face gear overlapping the end of the first end face gear, and the second end face gear being slidably sleeved on the spline shaft.

[0008] Preferably, a slot is provided at the center of the first end face gear, and the spline shaft protrudes outward through the shaft core at one end of the second end face gear to form a plug, which is rotatably inserted into the slot.

[0009] Preferably, a limit ring is integrally provided on the spline shaft, and the end of the pressing mechanism away from the overload clutch mechanism is attached to the limit ring.

[0010] Preferably, the pressing mechanism includes a sliding pressing member slidably sleeved on the spline shaft, a spring is provided between the sliding pressing member and the overload clutch mechanism, a retaining groove is provided on the sliding pressing member, and the structure on the engaging mechanism is sleeved on the retaining groove.

[0011] Preferably, the engagement mechanism includes a worm sleeve integrally sleeved on the rotating shaft, the outer edge of the worm sleeve is engaged with a worm gear mechanism, the worm gear mechanism is rotatably mounted in the bracket, a pressing mechanism is attached to the worm gear mechanism, one end of the pressing mechanism is sleeved on the structure of the engagement mechanism, and the other end of the pressing mechanism is slidably sleeved with a slide rod, the slide rod being installed in the bracket.

[0012] Preferably, the worm gear mechanism includes a wheel, and a cam is coaxially arranged on the side of the wheel, with a limiting groove formed on the outer edge of the cam.

[0013] Preferably, the pressing mechanism includes a pressing frame, one end of which is provided with a fastener sleeved on the pressing mechanism structure, the other end of which is integrally provided with a sliding sleeve, a wheel frame is provided in the middle of the pressing frame, and a roller is rotatably provided on the wheel frame, the roller being rolledly engaged with the worm gear mechanism.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The cam transmission mechanism of this machining lathe, by coaxially arranging the rotating shaft, spline shaft, and lead screw, and then setting an overload clutch mechanism as the connecting component between the spline shaft and the lead screw, allows the motor to drive the lead screw to rotate during operation, thereby causing the slide block mounted on the bolster to move with the motor, achieving the effect of replacing the hydraulic cylinder. When the cutting speed decreases due to tool wear, the lead screw speed is affected by the cutting speed and slows down, resulting in a difference between the motor speed and the lead screw speed, causing a speed overload phenomenon. At this time, the overload clutch mechanism slips due to the speed effect, thereby reducing the lead screw speed and preventing tool jamming, achieving the effect of protecting the motor and improving the service life of the lathe transmission mechanism.

[0016] 2. The cam transmission mechanism of this machining lathe, by setting up a engagement mechanism, has a rotating shaft that rotates with the motor. When the overload clutch mechanism slips due to the speed, the engagement mechanism continuously applies a downward pressure to the engagement mechanism as the shaft rotates, thereby indirectly providing a closing thrust to the overload clutch mechanism. This allows the lathe tool to still indirectly generate a downward impact thrust even when worn, thus improving the cutting effect of the tool. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the bracket of this utility model;

[0019] Figure 3 This is a schematic diagram of the disassembly structure of the overload clutch mechanism of this utility model;

[0020] Figure 4 This is a schematic cross-sectional view of the overload clutch mechanism of this utility model;

[0021] Figure 5 This is a schematic diagram of the pressing mechanism of this utility model;

[0022] Figure 6 This is a schematic diagram of the engagement mechanism of this utility model;

[0023] Figure 7 This is a schematic diagram showing the disassembled structure of the pressing mechanism of this utility model.

[0024] In the diagram: 1. Lead screw; 2. Pillow seat; 3. Overload clutch mechanism; 31. First end face gear; 32. Second end face gear; 33. Insert rod; 34. Slot; 4. Splined shaft; 5. Pressing mechanism; 51. Sliding part; 52. Spring; 53. Buckle groove; 6. Bracket; 7. Rotating shaft; 8. Motor; 9. Engaging mechanism; 91. Worm sleeve; 92. Worm joint mechanism; 921. Wheel; 922. Cam; 923. Limiting groove; 93. Pressing mechanism; 931. Press frame; 932. Fastener; 933. Sliding sleeve; 934. Wheel frame; 935. Roller; 94. Sliding rod; 10. Limiting ring. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-7 A cam transmission mechanism for a machining lathe includes: a lead screw 1, a pillow seat 2 threaded onto the lead screw 1, a slide ram mounted on the pillow seat 2 and mounted on the lathe, a splined shaft 4 coaxially mounted at the end of the lead screw 1, a rotating shaft 7 coaxially mounted at the end of the splined shaft 4 away from the lead screw 1, a motor 8 mounted at the end of the rotating shaft 7, and a bracket 6 rotatably mounted on the rotating shaft 7 via a bearing, the bracket 6 being mounted on the lathe.

[0027] The lead screw 1 and the spline shaft 4 are connected by an overload clutch mechanism 3. A pressing mechanism 5 is slidably sleeved on the spline shaft 4. A shifting mechanism 9 is provided inside the bracket 6. The pressing mechanism 5 and the rotating shaft 7 are connected by the shifting mechanism 9.

[0028] The overload clutch mechanism 3 includes a first end face gear 31 installed at the end of the lead screw 1. A second end face gear 32 is connected to the end of the first end face gear 31. The second end face gear 32 is slidably sleeved on the spline shaft 4. When the speed difference between the spline shaft 4 and the lead screw 1 is generated as the rotating shaft 7 rotates, the second end face gear 32 will slide along the spline shaft 4 and disengage from the first end face gear 31, thereby causing the overload clutch mechanism 3 to slip and achieve the effect of overload protection.

[0029] The first end face gear 31 has a slot 34 at its center. The spline shaft 4 passes through the shaft core of one end of the second end face gear 32 and protrudes outward to form a plug 33. The plug 33 is rotatably inserted into the slot 34. By connecting the plug 33 with the slot 34, the spline shaft 4 and the lead screw 1 are coaxially connected, thereby ensuring the stability of the overload clutch mechanism 3 during operation and avoiding wobbling or tilting.

[0030] Among them, a limit ring 10 is integrally set on the spline shaft 4, and the end of the pressing mechanism 5 away from the overload clutch mechanism 3 is connected to the limit ring 10. By setting the limit ring 10, the pressing mechanism 5 is restricted on the spline shaft 4, and the overload clutch mechanism 3 is guaranteed to have sufficient locking force under the action of the spring 52, so that the spline shaft 4 can smoothly drive the lead screw 1 to rotate through the overload clutch mechanism 3.

[0031] The pressing mechanism 5 includes a sliding pressing part 51 that is slidably sleeved on the spline shaft 4. A spring 52 is provided between the sliding pressing part 51 and the overload clutch mechanism 3. A retaining groove 53 is provided on the sliding pressing part 51. The structure on the engagement mechanism 9 is sleeved on the retaining groove 53. By setting the spring 52, the overload clutch mechanism 3 is given a downward thrust. At the same time, the retaining groove 53 is connected to the engagement mechanism 9, so that the engagement mechanism 9 indirectly gives the pressing mechanism 5 a downward elastic force as the rotating shaft 7 rotates, thus preventing the overload clutch mechanism 3 from slipping for a long time.

[0032] The engagement mechanism 9 includes a worm sleeve 91 integrally sleeved on the rotating shaft 7. The outer edge of the worm sleeve 91 is engaged with a worm gear mechanism 92. The worm gear mechanism 92 is rotatably mounted in the bracket 6. A pressing mechanism 93 is attached to the worm gear mechanism 92. One end of the pressing mechanism 93 is sleeved on the structure of the engagement mechanism 5, and the other end of the pressing mechanism 93 is slidably sleeved with a slide rod 94. The slide rod 94 is installed in the bracket 6. When the overload clutch mechanism 3 slips due to the speed, the engagement mechanism 9 continuously applies a downward pressing force to the pressing mechanism 5 as the rotating shaft 7 rotates, thereby indirectly applying a closing thrust to the overload clutch mechanism 3, so that the lathe tool can still indirectly generate a downward impact thrust under wear conditions.

[0033] The worm gear mechanism 92 includes a wheel 921. A cam 922 is coaxially arranged on the side of the wheel 921. A limit groove 923 is opened on the outer edge of the cam 922. The worm sleeve 91 drives the wheel 921 to rotate by meshing with the rotating shaft 7. Then, the cam 922 will roll and connect with the pressing mechanism 93 as the wheel 921 rotates, so that the pressing mechanism 93 follows the change of the outer edge of the cam 922 to spring and press the pressing mechanism 5, thereby indirectly giving the overload clutch mechanism 3 a strong thrust through the pressing mechanism 5.

[0034] The pressing mechanism 93 includes a pressing frame 931. One end of the pressing frame 931 is provided with a fastener 932 that is sleeved on the pressing mechanism 5. The other end of the pressing frame 931 is integrally provided with a sliding sleeve 933. A wheel frame 934 is provided in the middle of the pressing frame 931. A roller 935 is rotatably provided on the wheel frame 934. The roller 935 rolls and overlaps with the worm gear mechanism 92. A sliding rod 94 is provided to provide a fulcrum for the sliding sleeve 933. The sliding rod 94 is parallel to the spline shaft 4, so that the pressing mechanism 93 is in a parallel movement state when it presses the pressing mechanism 5, thus avoiding the situation where one end of the pressing frame 931 is skewed due to the large pressing force of the pressing mechanism 5.

[0035] The working principle involves replacing the hydraulic cylinder that drives the lathe ram with a transmission mechanism. When the lathe is working, the motor 8 drives the lead screw 1 to rotate through the overload clutch mechanism 3 between the spline shaft 4 and the lead screw 1, causing the ram to move. When the cutting tool is worn and cutting is slow, the lead screw 1 rotates slower due to the cutting speed of the tool. Due to the influence of the motor 8, a difference in speed is created between the spline shaft 4 and the lead screw 1. Then, the overload clutch mechanism 3 is overloaded due to this difference, resulting in slippage. This causes the lathe ram to reduce its downward speed due to the wear of the tool, thus preventing the tool from jamming and damaging the motor 8.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cam transmission mechanism for a machining lathe, characterized in that, include: A lead screw (1) is threaded with a pillow seat (2), a ram is mounted on the pillow seat (2) and placed on a lathe, a splined shaft (4) is coaxially mounted at the end of the lead screw (1), a rotating shaft (7) is coaxially mounted at the end of the splined shaft (4) away from the lead screw (1), a motor (8) is mounted at the end of the rotating shaft (7), and a bracket (6) is rotatably mounted on the rotating shaft (7) through a bearing, and the bracket (6) is mounted on a lathe; The lead screw (1) is connected to the spline shaft (4) by an overload clutch mechanism (3). A pressing mechanism (5) is slidably sleeved on the spline shaft (4). A shifting mechanism (9) is provided inside the bracket (6). The pressing mechanism (5) and the rotating shaft (7) are connected by a shifting mechanism (9).

2. The cam transmission mechanism of a machining lathe according to claim 1, characterized in that, The overload clutch mechanism (3) includes a first end face gear (31) installed at the end of the lead screw (1), and a second end face gear (32) is attached to the end of the first end face gear (31). The second end face gear (32) is slidably sleeved on the spline shaft (4).

3. The cam transmission mechanism of a machining lathe according to claim 2, characterized in that, A slot (34) is provided at the center of the first end face gear (31). The spline shaft (4) passes through the shaft core of one end of the second end face gear (32) to form a plug (33). The plug (33) is rotatably inserted into the slot (34).

4. The cam transmission mechanism of a machining lathe according to claim 1, characterized in that, A limit ring (10) is integrally provided on the spline shaft (4), and the end of the pressing mechanism (5) away from the overload clutch mechanism (3) is attached to the limit ring (10).

5. The cam transmission mechanism of a machining lathe according to claim 1, characterized in that, The pressing mechanism (5) includes a sliding pressing part (51) that is slidably sleeved on the spline shaft (4). A spring (52) is provided between the sliding pressing part (51) and the overload clutch mechanism (3). A retaining groove (53) is provided on the sliding pressing part (51). The structure on the engaging mechanism (9) is sleeved on the retaining groove (53).

6. The cam transmission mechanism of a machining lathe according to claim 1, characterized in that, The engagement mechanism (9) includes a worm sleeve (91) integrally sleeved on the rotating shaft (7). The outer edge of the worm sleeve (91) is engaged with a worm gear mechanism (92). The worm gear mechanism (92) is rotatably mounted in the bracket (6). A pressing mechanism (93) is attached to the worm gear mechanism (92). One end of the pressing mechanism (93) is sleeved on the structure of the engagement mechanism (5). The other end of the pressing mechanism (93) is slidably sleeved with a slide rod (94). The slide rod (94) is installed in the bracket (6).

7. The cam transmission mechanism of a machining lathe according to claim 6, characterized in that, The worm gear mechanism (92) includes a wheel (921), and a cam (922) is coaxially provided on the side of the wheel (921). A limiting groove (923) is provided on the outer edge of the cam (922).

8. The cam transmission mechanism of a machining lathe according to claim 6, characterized in that, The pressing mechanism (93) includes a pressing frame (931), one end of which is provided with a fastener (932) sleeved on the pressing mechanism (5) structure, and the other end of which is integrally provided with a sliding sleeve (933). A wheel frame (934) is provided in the middle of the pressing frame (931), and a roller (935) is rotatably provided on the wheel frame (934). The roller (935) is rolled and overlapped with the worm gear mechanism (92).

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