A motor-driven rotary table sealing device and a machine tool equipped with the sealing device.

Abstract

This invention discloses a rotary table sealing device and machine tool driven by a motor. The rotary table sealing device includes a rotary table connector with a first protrusion, a second protrusion, and an air outlet; a rotary table with a fifth protrusion and a sixth protrusion connected to the motor; a first channel formed between the side of the fifth protrusion near the axis and the side of the first protrusion away from the axis; a second channel formed between the fifth and sixth protrusions and the first protrusion; and a third channel formed between the side of the first protrusion near the axis and the side of the sixth protrusion away from the axis. The width of the first and third channels is smaller than the width of the second channel. A sealing connector connected to the rotary table connector, having an air chamber and an exhaust channel communicating with the air outlet, and located between the first and second protrusions. Compared with the prior art, this invention has the advantages of effectively preventing damage to the bearings inside the motor and burning out the motor coils, thus avoiding significant economic losses, and reducing rotary table maintenance.

Description

Technical Field

[0001] This invention relates to the field of machine tool technology, and more specifically, to a motor-driven rotary table sealing device and a machine tool equipped with the sealing device. Background Technology

[0002] A five-axis CNC machining center is a CNC machine tool used for subtractive processing of large materials. During the machining process, the cutting tool cuts the large material into sharp chips and powder particles. These chips and particles can easily cut or wear the sealing lips of the plastic sealing rings, allowing cutting fluid to enter the interior of the five-axis rotary table through the gaps. This can potentially damage the bearings inside the motor below the rotary table and burn out the motor coils, resulting in significant economic losses. Furthermore, the five-axis rotary table is a component assembled onto the five-axis machine tool. If water ingress occurs and the rotary table requires repair, replacing the sealing rings, bearings, and coils is extremely inconvenient. It requires using a crane to lift and disassemble the entire rotary table at the customer's site to replace the sealing rings, bearings, and coils. After replacement, the rotary table must be reassembled, and the entire machine must be recalibrated, resulting in a huge workload. Summary of the Invention

[0003] The purpose of this invention is to provide a motor-driven turntable sealing device to solve the above-mentioned technical problems.

[0004] This invention discloses a motor-driven turntable sealing device, comprising: a turntable connector fixed above the motor and having a first protrusion and a second protrusion arranged radially, with an air outlet communicating with an air supply pipe between the first and second protrusions; and a turntable disposed above the turntable connector, connected to the motor and driven to rotate by the motor, the turntable having a fifth protrusion and a sixth protrusion arranged sequentially in the radial direction, the side of the fifth protrusion near the axis of rotation cooperating with the side of the first protrusion away from the axis of rotation to form a first channel, and the fifth and sixth protrusions being connected to the first protrusion. The first protrusion, near the axis, and the sixth protrusion, away from the axis, cooperate to form a third channel. The first, second, and third channels are sequentially interconnected. The width of the first and third channels is smaller than that of the second channel. A sealing connector is connected to the turntable connector and is disposed between the first and second protrusions of the turntable connector. The sealing connector has an air chamber with a uniform air distribution function that communicates with the air outlet and an exhaust channel. One end of the exhaust channel is connected to the air chamber, and the other end is connected to the third channel.

[0005] In some preferred embodiments, a seal is provided between the turntable connector and the sealing connector.

[0006] In some preferred embodiments, the turntable is provided with a plurality of serrated first grooves in the second channel.

[0007] In some preferred embodiments, the side of the sixth protrusion near the axis cooperates with the sealing connector to form a fourth channel. The turntable is provided with a plurality of second grooves, and correspondingly, the turntable connector is provided with a plurality of third protrusions extending into the second grooves to form the sixth channel. A fifth channel is provided between the fourth channel and the sixth channel to connect the fourth channel and the sixth channel.

[0008] In some preferred embodiments, the sealing connector is provided with a third groove.

[0009] In some preferred embodiments, the side of the first protrusion away from the second protrusion is provided with a slope.

[0010] In some preferred embodiments, the first channel, the third channel, and the fourth channel are all arranged vertically.

[0011] In some preferred embodiments, both the second and fifth channels are arranged horizontally.

[0012] The present invention also provides a machine tool having the aforementioned motor-driven rotary table sealing device.

[0013] In some preferred embodiments, the machine tool further includes a cradle and two swing arms, which are respectively fixed on both sides of the cradle. The motor is installed inside the cradle. The turntable connector is provided with a first screw hole and a third screw. After the first screw is inserted into the first screw hole, it is threaded onto the cradle. The two swing arms are provided with a second screw hole and a fourth screw. After the second screw is inserted into the second screw hole, it is threaded onto the cradle. The upper end of the second screw hole is provided with a plug to seal the second screw hole. A sealing ring is provided between the turntable connector and the two swing arms.

[0014] Compared with the prior art, the present invention provides a motor-driven turntable sealing device. Gas released from the vent enters the gas chamber with a uniform gas distribution function and then overflows through the third channel, the second channel, and the first channel. Since the width of the first channel and the width of the third channel are both smaller than the width of the second channel, the gas flow rate will increase when passing through the third channel and the first channel. An air curtain is formed at the edge of the turntable to effectively prevent sharp debris and powder particles from entering the turntable. It has the advantages of eliminating the need for plastic seals, effectively preventing cutting fluid from entering the motor, preventing damage to the bearings inside the motor and burning out the motor coils, thus avoiding significant economic losses, and reducing turntable maintenance. Attached Figure Description

[0015] Figure 1 This is a partial cross-sectional view of a motor-driven turntable sealing device according to the present invention.

[0016] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0017] Figure 3A 3D view of the turntable connector;

[0018] Figure 4 A 3D view of the turntable connector;

[0019] Figure 5 This is a perspective view of the turntable connector from another direction.

[0020] Figure 6 This is a perspective view of a machine tool according to the present invention;

[0021] Figure 7 for Figure 6 A partial sectional front view;

[0022] Figure 8 for Figure 7 A magnified view of a section at point B in the middle;

[0023] Figure 9 for Figure 6 The exploded diagram.

[0024] The implementation and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] To further illustrate the technical means and effects adopted by this application to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0026] like Figures 1 to 5 , combined Figure 9As shown, a motor-driven turntable sealing device of the present invention includes: a turntable connector 1, which is fixed above a motor 2 and has a first protrusion 11 and a second protrusion 12 arranged in the radial direction, and an air outlet 13 communicating with an air supply pipe is provided between the first protrusion 11 and the second protrusion 12; a turntable 3, which is disposed above the turntable connector 1, connected to the rotating shaft of the motor 2 and driven to rotate by the motor 2, and the turntable 3 and the rotating shaft of the motor 2 are connected by a first screw. The turntable 3 has a fifth protrusion 31 and a sixth protrusion 32 arranged sequentially in the radial direction. The side of the fifth protrusion 31 near the axis (the axis refers to the center of the motor 2 shaft) cooperates with the side of the first protrusion 11 away from the axis to form a first channel 101. The fifth protrusion 31 and the sixth protrusion 32 cooperate with the first protrusion 11 to form a second channel 102. The side of the first protrusion 11 near the axis cooperates with the side of the sixth protrusion 32 away from the axis to form a third channel 103. The first channel 101, the second channel 102, and the third channel 103 are sequentially interconnected. The width W1 of the first channel 101 and the width W3 of the third channel 103 are both smaller than the width W2 of the second channel. A sealing connector 4 is connected to the turntable connector 1 by a second screw and is located between the first protrusion 11 and the second protrusion 12 of the turntable connector 1. The sealing connector 4 is provided with a function of uniform air distribution that communicates with the air outlet 13. The system includes an air chamber 41 and an exhaust channel 42. One end of the exhaust channel 42 is connected to the air chamber 41, and the other end is connected to the third channel 103. Compared with the prior art, in this invention, the gas released from the air outlet 13 enters the air chamber 41, which has a uniform gas distribution function. After passing through the exhaust channel 42, a portion of the gas will enter the third channel 103, the second channel 102, and the first channel 101 before overflowing. Since the widths W1 and W3 of the first channel 101 and the third channel 103 are both smaller than the width of the second channel W2, the gas flow rate will increase when passing through the third channel 103 and the first channel 101. This forms an air curtain at the edge of the turntable 3, effectively preventing sharp debris and powder particles from entering the turntable. This eliminates the need for plastic seals and effectively prevents cutting fluid from entering the motor, thus preventing damage to the bearings inside the motor and burning out the motor coils, which would result in significant economic losses. It also reduces the need for turntable maintenance.

[0027] To improve the sealing effect of the air chamber 41, a sealing element 5 is provided between the turntable connector 1 and the sealing connector 4, so that the gas in the air chamber 41 can only be discharged through the exhaust channel 42.

[0028] Specifically, the turntable 3 is provided with multiple sawtooth-shaped first grooves 100 in the second channel 102. The turntable 3 is driven to rotate by the shaft of the motor 2. The turntable connector 1 and the sealing connector 4 are fixed. The function of the multiple sawtooth-shaped first grooves 100 is that after liquid or dust enters the second channel 102 through the first channel 101, the liquid or dust that the air curtain cannot stop will be thrown out of the first channel 101 due to centrifugal force due to the rotation of the turntable 3. The gas will form a vortex-shaped airflow in the second flow channel 102, which further effectively isolates the liquid or dust from entering the interior of the turntable 3.

[0029] Furthermore, the side of the sixth protrusion 32 closest to the axis mates with the sealing connector 4 to form a fourth channel 104. The turntable 3 has three second grooves 33, and correspondingly, the turntable connector 1 has three third protrusions 14 that extend into the second grooves 33 to form the sixth channel 106. The third protrusions 14 of the turntable connector 1 mate with the second grooves 33 of the turntable to form a meandering sixth channel 106, which can effectively slow down the gas flow rate and create resistance to the continued flow of liquid or dust, effectively isolating the liquid or dust.

[0030] Specifically, a fifth channel 105 is provided between the fourth channel 104 and the sixth channel 106, connecting the two channels. After the gas released from the vent 13 enters the gas chamber 41 which has a uniform gas distribution function, a portion of the gas passes through the exhaust channel 42 and overflows into the fourth channel 104, the fifth channel 105, and the sixth channel 106. The gas overflowing from the sixth channel 106 can dissipate heat from the bearings of the motor 2, effectively extending the service life of the motor 2's bearings.

[0031] The sealing connector 4 is provided with a third groove 43. The third groove 43 is used to store liquid or dust entering the fifth channel 105, and can also prevent liquid or dust from entering the turntable 3.

[0032] Optionally, a slope 15 is provided on the side of the first protrusion 11 away from the second protrusion 12. The slope 15 has the function of blocking liquid or dust and reducing the flow rate of liquid or dust, and can prevent liquid or dust from entering the interior of the turntable 3.

[0033] Furthermore, the first channel 101, the third channel 103, and the fourth channel 104 are all arranged vertically; the second channel 102 and the fifth channel 105 are all arranged horizontally. The vertical arrangement of the first channel 101, the third channel 103, and the fourth channel 104 makes it difficult for liquids or dust to flow into the motor 2.

[0034] like Figures 6 to 9As shown, a machine tool according to the present invention includes a cradle 6, two swing arms 7, and the aforementioned motor-driven rotary table sealing device. The two swing arms 7 are respectively fixed on both sides of the cradle 6. The motor 2 is installed inside the cradle 6. The rotary table connecting member 1 is provided with a first screw hole 16 and a third screw 17. The third screw 16 is inserted into the first screw hole 17 and threaded onto the cradle 6. The two swing arms 7 are provided with a second screw hole 71 and a fourth screw 72. The fourth screw 72 is inserted into the second screw hole 71 and threaded onto the cradle 6. A plug 8 is provided at the upper end of the fourth screw hole 72 to seal the second screw hole 72. A sealing ring 9 is provided between the rotary table connecting member 1 and the two swing arms 7. The plug 8 and the sealing ring 9 are used to prevent the motor 2 from failing due to the seepage of liquid or dust in the installation gap. The present invention has the beneficial effects of the aforementioned motor-driven rotary table sealing device.

[0035] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A motor-driven turntable sealing device, characterized in that, include: The turntable connector is fixed above the motor and has a first protrusion and a second protrusion in the radial direction. An air outlet is provided between the first protrusion and the second protrusion, which is connected to the air supply pipe. A turntable is located above a turntable connector and connected to a motor, which drives it to rotate. The turntable has a fifth protrusion and a sixth protrusion arranged in sequence in the radial direction. The side of the fifth protrusion closer to the axis and the side of the first protrusion farther from the axis form a first channel. The fifth and sixth protrusions and the first protrusion form a second channel. The side of the first protrusion closer to the axis and the side of the sixth protrusion farther from the axis form a third channel. The first, second, and third channels are connected to each other in sequence. The width of the first and third channels is smaller than the width of the second channel. A sealing connector is connected to the turntable connector and is disposed between the first protrusion and the second protrusion of the turntable connector. The sealing connector has an air chamber with a uniform air distribution function that is connected to the air outlet and an exhaust channel. One end of the exhaust channel is connected to the air chamber and the other end is connected to the third channel. The sixth protrusion near the axis forms a fourth channel with the sealing connector. The turntable has several second grooves, and the turntable connector has several third protrusions that extend into the second grooves to form the sixth channel. A fifth channel connects the fourth channel and the sixth channel.

2. The motor-driven turntable sealing device according to claim 1, characterized in that, A seal is provided between the turntable connector and the sealing connector.

3. The motor-driven turntable sealing device according to claim 1, characterized in that, The turntable has several serrated first grooves in the second channel.

4. The motor-driven turntable sealing device according to claim 1, characterized in that, The sealing connector is provided with a third groove.

5. The motor-driven turntable sealing device according to claim 1, characterized in that, The first protrusion has a slope on the side away from the second protrusion.

6. The motor-driven turntable sealing device according to claim 1, characterized in that, The first, third, and fourth channels are all arranged vertically.

7. The motor-driven turntable sealing device according to claim 1, characterized in that, Both the second and fifth channels are arranged horizontally.

8. A machine tool, characterized in that: A turntable sealing device driven by a motor, as described in any one of claims 1-7.

9. A machine tool according to claim 8, characterized in that, The machine tool also includes a cradle and two swing arms, which are fixed on both sides of the cradle. The motor is installed inside the cradle. The turntable connector is provided with a first screw hole and a third screw. After the first screw is inserted into the first screw hole, it is threaded onto the cradle. The two swing arms are provided with a second screw hole and a fourth screw. After the second screw is inserted into the second screw hole, it is threaded onto the cradle. The upper end of the second screw hole is provided with a plug to seal the second screw hole. A sealing ring is provided between the turntable connector and the two swing arms.

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