Transmission mechanism and driving device and thermoforming machine using the same

Abstract

The utility model relates to a kind of transmission mechanism and the driving device and thermoforming machine of application of the transmission mechanism capable of eliminating gap.This transmission mechanism includes fixed seat, rack and gear, it is characterized by: first aligning flange and second aligning flange are installed on fixed seat, first aligning flange has first rotating circular platform, first rotating hole is equipped on fixed seat, the first rotating circular platform of first aligning flange is matched and arranged in first rotating hole, eccentric first eccentric hole is equipped on first rotating circular platform, gear has gear shaft, second aligning flange has second rotating circular platform, second rotating hole is equipped on fixed seat, the second rotating circular platform of second aligning flange is matched and arranged in second rotating hole, eccentric second eccentric hole is equipped on second rotating circular platform, gear shaft is respectively installed in first eccentric hole and second eccentric hole in two ends.This transmission mechanism eliminates the gap between transmission teeth by rotating aligning flange, thereby greatly prolongs the service life of transmission mechanism.

Description

Technical Field

[0001] This utility model relates to a transmission mechanism and a driving device and thermoforming machine using the transmission mechanism. Background Technology

[0002] Gear and rack transmission, as one of the most fundamental transmission methods in the field of mechanical transmission, is widely used in precision equipment such as industrial automation, robots, and CNC machine tools. Its working principle is as follows: a motor drives the gear to rotate, and the meshing motion of the gear and rack converts the rotational motion into linear motion, thereby driving the actuator to complete a specific action. This transmission method has advantages such as simple structure, high transmission efficiency, and strong load-bearing capacity. However, it has the following significant drawbacks in long-term operation: During the meshing process, there is relative sliding and rolling friction between the gear and rack tooth surfaces. Long-term, high-frequency operation will cause the tooth surface material to gradually peel off, forming pitting, scuffing, or plastic deformation. When the tooth surface wear exceeds the allowable range of tooth thickness, it will cause problems such as decreased transmission accuracy, increased noise, and even jamming, seriously affecting the stability and service life of the equipment. Existing methods improve the wear resistance of the tooth surface by using high-hardness alloy steel and surface carburizing and quenching, but these are costly and cannot completely eliminate wear. Current technologies use regular application of grease to reduce the coefficient of friction, but this requires frequent downtime for maintenance, and the lubricant easily pollutes the environment, limiting its effectiveness in special working conditions such as dust-free environments and high temperatures. In terms of structure, designing redundant dual-gear transmissions and adding rack and pinion guide devices can improve reliability, but they also increase system complexity and size. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, this utility model innovatively provides a transmission mechanism that can eliminate gaps, a drive device using the transmission mechanism, and a thermoforming machine.

[0004] This transmission mechanism includes a fixed base, a rack, and a gear. The rack is retractably mounted on the fixed base, and the gear is rotatably mounted within the fixed base. The gear meshes with the rack. The fixed base is characterized by having a first self-aligning flange and a second self-aligning flange. The first self-aligning flange has a first rotating frustum. The fixed base has a first rotating hole, and the first rotating frustum of the first self-aligning flange is fitted into the first rotating hole. The first rotating frustum has a first eccentric hole, the center of which is offset from the center of the first rotating frustum. The gear has a gear shaft, one end of which is mounted in the first eccentric hole via a bearing. The second self-aligning flange... The first self-aligning flange has a second rotating frustum. The fixed base has a second rotating hole. The second rotating frustum of the second self-aligning flange is matched and disposed in the second rotating hole. The second rotating frustum has a second eccentric hole corresponding to the first eccentric hole. The center of the second eccentric hole is offset from the center of the second rotating frustum. The other end of the gear shaft is mounted in the second eccentric hole through a bearing. The first self-aligning flange has a first arc-shaped elongated hole. The first adjusting bolt is disposed in the first arc-shaped elongated hole and is threadedly connected to the fixed base. The second self-aligning flange has a second arc-shaped elongated hole. The second adjusting bolt is disposed in the second arc-shaped elongated hole and is threadedly connected to the fixed base.

[0005] This drive device includes a geared motor and the transmission mechanism described above. The geared motor has an output shaft. The characteristic is that the geared motor is connected to the first self-aligning flange of the transmission mechanism. The output shaft of the geared motor is provided with a transmission spline. The gear shaft of the gear is provided with a connecting through hole along the axis. The inner wall of the connecting through hole is provided with a transmission groove for the transmission spline to enter. The output shaft is coaxial with the first eccentric hole.

[0006] This thermoforming machine includes a stand, a first mold base, and a second mold base. The first mold base and the second mold base are both mounted on the stand and arranged vertically. The first mold base is slidably mounted on the stand. A first molding power source is mounted on the stand. The first molding power source is connected to the first mold base through a first transmission mechanism. The machine is characterized in that: the first mold base is connected to the aforementioned driving device, and the rack of the driving device passes through the first mold base and is connected to the pull-up head.

[0007] The first transmission mechanism includes a first transmission shaft and two first transmission components, each of which includes a first connecting rod, a first transmission arm, and a first connecting seat. The first transmission shaft is rotatably mounted on the upright frame. The upper end of the first connecting rod is fixedly connected to the first transmission shaft. The lower end of the first connecting rod is hinged to the upper end of the first transmission arm. The lower end of the first transmission arm is hinged to the first connecting seat. The first connecting seat is connected to the first mold base. The first molding power source is connected to the first transmission shaft.

[0008] According to the transmission mechanism provided by this utility model, the gap between the transmission teeth is eliminated by rotating the self-aligning flange, thereby greatly extending the service life of the transmission mechanism. Attached Figure Description

[0009] Figure 1 Schematic diagram of the drive device Figure 1 ;

[0010] Figure 2 Schematic diagram of the drive device Figure 2 (The mounting base is hidden);

[0011] Figure 3 This is a sectional view of the drive unit;

[0012] Figure 4 This is a schematic diagram of the mounting bracket;

[0013] Figure 5 For the three-dimensional arrangement of the first self-aligning flange and the second self-aligning flange Figure 1 ;

[0014] Figure 6 For the three-dimensional arrangement of the first self-aligning flange and the second self-aligning flange Figure 2 ;

[0015] Figure 7 This is the front view of the first self-aligning flange;

[0016] Figure 8 This is a 3D view of a geared motor;

[0017] Figure 9 This is a 3D view of a thermoforming machine;

[0018] Figure 10 This is a structural diagram of the upper mold, lower mold, and first pull-up head. Detailed Implementation

[0019] like Figure 1As shown, this transmission mechanism includes a fixed base 2, a rack 3, and a gear 4. The rack 3 is telescopically mounted on the fixed base 2 via a linear bearing (moving axially), and the gear 4 is rotatably mounted inside the fixed base 2. The gear 4 meshes with the rack 3. When the power source drives the gear 4 to rotate, the gear 4 can drive the rack 3 to move.

[0020] Over time, wear will occur between gear 4 and rack 3, leading to increased clearance and affecting transmission. To solve this problem, such as... Figure 1 and Figure 2 As shown, a first self-aligning flange 5 and a second self-aligning flange 6 are installed on the fixed base 2, as follows: Figure 2 and Figure 5 As shown, the first self-aligning flange 5 has a first rotating frustum 50, as... Figure 4 As shown, the fixed base 2 is provided with a first rotating hole 20, such as Figure 3 As shown, the first rotating frustum 50 of the first self-aligning flange 5 is matched and disposed within the first rotating hole 20 (the first self-aligning flange 5 rotates within the first rotating hole 20 on the fixed base 2 through the first rotating frustum 50), as... Figure 2 and Figure 3 As shown, the first rotating frustum 50 is provided with a first eccentric hole 51, the center of which is offset from the center of the first rotating frustum 50 (e.g., Figure 7 As shown, the radius line B of the first eccentric hole 51 and the radius line A of the first rotating frustum 50 are spaced apart, and the gear 4 has a gear shaft 40, one end of which is mounted in the first eccentric hole 51 via a bearing (the bearing is not shown for ease of viewing). Figure 6 As shown, the second self-aligning flange 6 has a second rotating frustum 60, as... Figure 4 As shown, the fixed base 2 is provided with a second rotating hole 21, such as Figure 3 As shown, the second rotating frustum 60 of the second self-aligning flange 6 is matched and disposed within the second rotating hole 21 (the second self-aligning flange 6 rotates within the second rotating hole 21 on the fixed base 2 through the second rotating frustum 60), as... Figure 2 and Figure 6 As shown, the second rotating frustum 60 is provided with a second eccentric hole 61 corresponding to the first eccentric hole 51 (here, "corresponding" means that the two eccentric holes are symmetrical to ensure that the two ends of the gear shaft 40 are eccentrically aligned). The center of the second eccentric hole 61 is offset from the center of the second rotating frustum 60, and the other end of the gear shaft 40 is mounted in the second eccentric hole 61 through a bearing; Figure 1 As shown, a first arc-shaped elongated hole 52 is provided on the first self-aligning flange 5, and a first adjusting bolt (not shown) is provided in the first arc-shaped elongated hole 52. The first adjusting bolt is threadedly connected to the fixed seat 2, as shown. Figure 3As shown, the second self-aligning flange 6 is provided with a second arc-shaped elongated hole 62, and a second adjusting bolt is provided in the second arc-shaped elongated hole 62. The second adjusting bolt is threadedly connected to the fixed seat 2.

[0021] The adjustment method of this transmission mechanism is as follows: When the gap between gear 4 and rack 3 is too large and adjustment is required (usually fine adjustment), first loosen the first adjusting bolt on the first self-aligning flange 5 and the second adjusting bolt on the second self-aligning flange 6. Then rotate the first self-aligning flange 5, and the first self-aligning flange 5 will rotate through the first rotating platform 50 in the first rotating hole 20 on the fixed seat 2. Since the first eccentric hole 51 on the first self-aligning flange 5 is eccentric relative to the first rotating platform 50, the first eccentric hole 51 drives the gear shaft 40 to deflect (because the gear...). One end of the gear shaft 40 is mounted in the first eccentric hole 51 via a bearing. As one end of the gear shaft 40 deflects, the other end also deflects. Since the other end of the gear shaft 40 is mounted in the second eccentric hole 61 of the second self-aligning flange 6 via a bearing, the second self-aligning flange 6 also rotates automatically. This brings the gear 4 closer to the rack 3. After adjustment, both the first and second adjusting bolts are tightened to fix both the first and second self-aligning flanges 5 and 6 onto the fixed seat 2, thereby eliminating the gap between the gear 4 and the rack 3. This backlash-eliminating structure of the transmission mechanism is simple, inexpensive, and easy to adjust.

[0022] The transmission mechanism described above is generally connected to the geared motor 1 to form a drive device. For example... Figure 1 As shown, the geared motor 1 is connected to the first self-aligning flange 5 of the transmission mechanism, as follows: Figure 8 As shown, the geared motor 1 has an output shaft 10, and a transmission spline 11 is provided on the output shaft 10 of the geared motor 1, such as... Figure 3 As shown, the gear shaft 40 of gear 4 has a connecting through hole 41 along its axis. The inner wall of the connecting through hole 41 has a transmission groove for the transmission spline 11 to enter (the output shaft 10 drives the gear shaft 40 to rotate through the transmission spline 11). The output shaft 10 is coaxial with the first eccentric hole 51. During adjustment, the first self-aligning flange 5 rotates. Since the geared motor 1 is mounted on the first self-aligning flange 5, the geared motor 1 rotates synchronously. Because the output shaft 10 of the geared motor 1 is coaxial with the first eccentric hole 51, the output shaft 10 and gear 4 deflect together. After adjustment, tighten both the first adjusting bolt and the second adjusting bolt.

[0023] The drive device described above can be used in a thermoforming machine to heat-press plastic sheets into plastic products. For example... Figure 9As shown, this thermoforming machine includes a frame 71, an upper mold A, a first mold base 72, a lower mold B, and a second mold base 73. The upper mold A is mounted on the first mold base 72, and the lower mold B is mounted on the second mold base 73. The first mold base 72 and the second mold base 73 are both mounted on the frame 71 and are arranged vertically. The first mold base 72 is slidably mounted on the frame 71. A first molding power source 76 is mounted on the frame 71. The first molding power source 76 is connected to the first mold base 72 via a first transmission mechanism. The aforementioned drive device is connected to the first mold base 72. The rack 3 of the drive device passes through the first mold base 72 and is connected to the pull head 794. Figure 10 As shown, when the upper mold A and the lower mold B are closed, the reduction motor 1 drives the gear 4 to rotate. The gear 4 drives the rack 3 to move downward, and the rack 3 drives the pull head 794 to press down, so that the pull head 794 is pressed into the lower mold B to form the blank of the plastic product. Due to the contact of the pull head 794, and because the pull head 794 is cold, the hot blank of the plastic product can be locally shaped. This ensures that the bottom of the plastic product maintains a uniform thickness during the subsequent air pressure molding process, resulting in better quality of the finished plastic product.

[0024] like Figure 9 As shown, the first transmission mechanism includes a first transmission shaft 74 and two first transmission components 75 on the left and right. Each first transmission component 75 includes a first connecting rod 751, a first transmission arm 752, and a first connecting seat 753. The first transmission shaft 74 is rotatably mounted laterally on the upright frame 71. The upper end of the first connecting rod 751 is fixedly connected to the first transmission shaft 74, and the lower end of the first connecting rod 751 is hinged to the upper end of the first transmission arm 752. The lower end of the first transmission arm 752 is hinged to the first connecting seat 753. The first connecting seat 753 is connected to the first mold base 72. The first molding power source 76 is connected to the first transmission shaft 74 for transmission. During operation, the first molding power source 76 drives the first transmission shaft 74 to rotate. The first transmission shaft 74 drives the first connecting rod 751 to swing (swing back and forth at a certain angle). The first connecting rod 751 then pulls the first transmission arm 752 to move up and down. The first transmission arm 752 drives the first mold base 72 to move up and down through the first connecting seat 753. In this way, the upper mold A can move up and down. Since the first drive shaft 74 is directly mounted laterally on the stand 71, the radial force on the first drive shaft 74 will act on the stand, which is a main structure, thus making the structure more stable. Moreover, after the first drive shaft 74 is mounted laterally on the stand 71, the first molding power source 76 can be installed on the side of the stand 71. This not only frees up space above the stand but also makes it easier to install the first molding power source 76. In addition, this method can free up a larger space between the two first transmission components 75, so that there is enough space on the first mold base 72 for installing the pull-assisted drive device.

Claims

1. A transmission mechanism comprising a fixed base (2), a rack (3), and a gear (4), wherein the rack (3) is retractably mounted on the fixed base (2), and the gear (4) is rotatably mounted within the fixed base (2), wherein the gear (4) meshes with the rack (3), characterized in that: The fixed base (2) is equipped with a first self-aligning flange (5) and a second self-aligning flange (6). The first self-aligning flange (5) has a first rotating frustum (50). The fixed base (2) is provided with a first rotating hole (20). The first rotating frustum (50) of the first self-aligning flange (5) is matched and disposed in the first rotating hole (20). The first rotating frustum (50) is provided with a first eccentric hole (51). The center of the first eccentric hole (51) is offset from the center of the first rotating frustum (50). The gear (4) has a gear shaft (40). One end of the gear shaft (40) is mounted in the first eccentric hole (51) through a bearing. The second self-aligning flange (6) has a second rotating frustum (60). The fixed base (2) is provided with a second rotating hole (21). The second rotating frustum (60) of the self-aligning flange (6) is matched and disposed in the second rotating hole (21). The second rotating frustum (60) is provided with a second eccentric hole (61) corresponding to the first eccentric hole (51). The center of the second eccentric hole (61) is offset from the center of the second rotating frustum (60). The other end of the gear shaft (40) is installed in the second eccentric hole (61) through a bearing. The first self-aligning flange (5) is provided with a first arc-shaped long hole (52). The first arc-shaped long hole (52) is provided with a first adjusting bolt. The first adjusting bolt is threadedly connected to the fixed seat (2). The second self-aligning flange (6) is provided with a second arc-shaped long hole (62). The second arc-shaped long hole (62) is provided with a second adjusting bolt. The second adjusting bolt is threadedly connected to the fixed seat (2).

2. A driving device comprising a geared motor (1) and the transmission mechanism of claim 1, wherein the geared motor (1) has an output shaft (10), characterized in that: The geared motor (1) is connected to the first self-aligning flange (5) of the transmission mechanism. The output shaft (10) of the geared motor (1) is provided with a transmission spline (11). The gear shaft (40) of the gear (4) is provided with a connecting through hole (41) along the axis. The inner wall of the connecting through hole (41) is provided with a transmission groove for the transmission spline (11) to enter. The output shaft (10) is coaxial with the first eccentric hole (51).

3. A thermoforming machine, comprising a stand (71), a first mold base (72), and a second mold base (73), wherein the first mold base (72) and the second mold base (73) are both mounted on the stand (71) and arranged vertically, the first mold base (72) is slidably mounted on the stand (71), and a first molding power source (76) is mounted on the stand (71), the first molding power source (76) being connected to the first mold base (72) via a first transmission mechanism, characterized in that: The first mold base (72) is connected to the driving device as described in claim 2, and the rack of the driving device passes through the first mold base (72) and is connected to the pull head (794).

4. A thermoforming machine according to claim 3, characterized in that: The first transmission mechanism includes a first transmission shaft (74) and two first transmission components (75) on the left and right. Each first transmission component (75) includes a first connecting rod (751), a first transmission arm (752) and a first connecting seat (753). The first transmission shaft (74) is rotatably mounted on the stand (71) laterally. The upper end of the first connecting rod (751) is fixedly connected to the first transmission shaft (74). The lower end of the first connecting rod (751) is hinged to the upper end of the first transmission arm (752). The lower end of the first transmission arm (752) is hinged to the first connecting seat (753). The first connecting seat (753) is connected to the first mold base (72). The first molding power source (76) is connected to the first transmission shaft (74) in a transmission connection.

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