CN116330235A

CN116330235A - Rotary workbench with liquid leakage detection function

Info

Publication number: CN116330235A
Application number: CN202111592913.3A
Authority: CN
Inventors: 黄立文; 林昱铭; 何志豪; 陈宥辰
Original assignee: Hiwin Technologies Corp
Current assignee: Hiwin Technologies Corp
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2023-06-27

Abstract

The invention provides a rotary workbench with a liquid leakage detection function, which comprises a shell, a motor, a mandrel and a liquid leakage detection belt. The shell is provided with a first groove, a second groove and a flow guiding channel connected with the first groove and the second groove, the mandrel is arranged in the shell and is provided with a flow guiding part, and the liquid leakage detection belt is arranged in the containing groove of the shell and is clamped in the second groove. Therefore, if liquid enters the shell, the flow guide part of the mandrel guides the liquid into the first groove, so that the liquid reaches the second groove along the flow guide way, and the liquid leakage detection can be carried out by utilizing the liquid leakage detection belt at the moment so as to protect key components.

Description

Rotary workbench with liquid leakage detection function

Technical Field

The present invention relates to a rotary table, and more particularly, to a rotary table with a leakage detection function.

Background

US7,692,553B2 discloses a leak detection system in which a sensor is provided between the bearing assembly and the backup seal system to sense whether there is a leak in the coolant. In the foregoing patent documents, when the sensor senses that the coolant is leaked, the leaked coolant often passes through the bearing assembly, so that the bearing assembly is easily damaged, and once the bearing assembly has a problem, the operation of other critical components (such as a rotor) is affected. Accordingly, the above patent document has room for improvement in terms of structure.

Disclosure of Invention

The invention mainly aims to provide a rotary workbench which has a liquid leakage detection function so as to prevent key components from being damaged by permeated liquid.

In order to achieve the above main purpose, the rotary table of the present invention comprises a housing, a motor, a spindle and a leakage detecting belt. The shell is provided with a containing groove, the groove wall of the containing groove is provided with a first groove, a second groove and a drainage channel, and the front end and the rear end of the drainage channel are respectively connected with the first groove and the second groove; the motor is arranged in the accommodating groove of the shell and is used for providing a power source; the mandrel is rotatably arranged in the accommodating groove of the shell and connected with the motor, so that the mandrel can be driven by the motor to rotate, the mandrel is provided with a first end and a second end, and the peripheral surface of the first end of the mandrel is provided with a diversion part; the liquid leakage detection belt is arranged in the containing groove of the shell, and a part of the liquid leakage detection belt is clamped in the second groove of the shell.

Therefore, if liquid enters the container, the guide part of the mandrel guides the liquid into the first groove, and then the liquid reaches the second groove along the guide channel to contact with the liquid leakage detection belt, at the moment, the liquid leakage detection belt can be triggered to send a detection signal to a controller so as to remind an operator to shut down, so that key components (such as the motor) are prevented from being damaged by the liquid.

Preferably, the front end of the housing has a shaft hole, the receiving groove is axially connected to the housing, the first groove is closer to the shaft hole than the second groove, the first end of the mandrel protrudes out of the housing partially through the shaft hole of the housing, and the guiding portion is located in the receiving groove of the housing.

Preferably, the rotary table of the present invention further comprises a rotary sealing member, wherein the rotary sealing member is disposed in the shaft hole of the housing and abuts against the outer peripheral surface of the first end of the spindle, and forms a diversion channel with the diversion portion of the spindle, and the diversion channel is communicated with the first groove of the housing. Therefore, if the rotary sealing element fails and liquid enters the containing groove, the flow guiding part of the mandrel guides the liquid into the first groove through the flow guiding channel, and the liquid reaches the second groove along the flow guiding channel to be in contact with the liquid leakage detection belt.

Preferably, the rotary table of the present invention further comprises a protected component disposed on the spindle and on a side of the guiding portion of the spindle opposite to the rotary seal, wherein the guiding portion is used to prevent the liquid from directly spraying onto the protected component.

Preferably, the outer diameter of the protected component is smaller than the outer diameter of the diversion part of the mandrel, and the liquid is prevented from flowing to the protected component by the size difference between the protected component and the diversion part.

Preferably, the distance between the first groove and the containing groove is smaller than the distance between the second groove and the containing groove, so that the first groove and the containing groove have a height difference, and the liquid is drained conveniently.

Preferably, the extending direction of the first groove and the extending direction of the second groove are perpendicular to the axial direction of the mandrel, and the extending direction of the guiding channel is parallel to the axial direction of the mandrel. The above-mentioned processing can be achieved by drilling the casing.

Preferably, the extending direction of the first groove and the extending direction of the second groove are perpendicular to the axial direction of the mandrel, the casing is drilled to achieve the processing, and the distance between the drainage channel and the containing groove is gradually increased from the first groove to the second groove, so that the drainage channel has a slope design, and the drainage of liquid is facilitated.

Preferably, the guiding part has different structural designs according to the liquid property, for the liquid with higher viscosity, the guiding part protrudes from one side surface opposite to the rotary sealing member to form an oblique angle part, or the guiding part protrudes from one end of the guiding part towards the direction of the rotary sealing member to form a hook part, the oblique angle part or the hook part provides a guiding effect for the liquid with higher viscosity, for the liquid with lower viscosity, the guiding part protrudes from one side surface opposite to the rotary sealing member to form an annular flange or is concavely provided with an annular groove, and the labyrinth design formed by the cooperation of the annular flange and the annular groove and the concave-convex structure corresponding to the annular flange and the annular groove truly protects the protected component on one hand, and provides the guiding effect for the liquid with lower viscosity on the other hand.

The detailed structure, features, assembly or use of the rotary table with the leakage detection function provided by the invention will be described in the detailed description of the embodiments below. However, those of ordinary skill in the art will appreciate that the detailed description and the specific embodiments described in connection with the practice of the invention are presented for purposes of illustration only and are not intended to limit the scope of the invention as claimed.

Drawings

Fig. 1 is a perspective view of a rotary table according to the present invention.

Fig. 2 is a partial cross-sectional view of the rotary table of the present invention, mainly showing the positions of the first groove, the second groove and the guide channel.

Fig. 3 is a side view of the rotary table of the present invention, mainly showing the positions of the first groove, the second groove and the guide channel.

Fig. 4 is a cross-sectional view of a rotary table of the present invention.

FIG. 5 is a partial cross-sectional view of a mandrel and protected assembly provided by the rotary table of the present invention, showing generally different embodiments of the flow guide portion of the mandrel.

FIG. 6 is a partial cross-sectional view of a mandrel and protected assembly provided by the rotary table of the present invention, showing generally different embodiments of the flow guide portion of the mandrel.

FIG. 7 is a partial cross-sectional view of a mandrel and protected assembly provided by the rotary table of the present invention, showing generally different embodiments of the flow guide portion of the mandrel.

FIG. 8 is a partial cross-sectional view of a mandrel and protected assembly provided by the rotary table of the present invention, showing generally different embodiments of the flow guide portion of the mandrel.

[ reference numerals description ]

10: rotary table

20: shell body

21: shaft hole

22: container groove

23: annular positioning groove

24: first groove

25: second groove

26: flow guiding channel

30: motor with a motor housing

40: mandrel

41: first end

42: second end

43: flow guiding part

432: bevel portion

434: hook part

436: annular flange

438: annular groove

44: first bearing

45: second bearing

46: turntable

47: brake device

50: rotary seal

52: diversion channel

60: protected component

70: liquid leakage detection belt

Detailed Description

Applicant hereby gives notice that throughout this specification, including the examples presented below and claims, directional terms are used to refer to the directions in the drawings. Next, in the embodiments to be described below and the drawings, the same reference numerals denote the same or similar components or structural features thereof.

Referring to fig. 1 and 4, a rotary table 10 of the present invention, which is exemplified as a single-axis horizontal table, includes a housing 20, a motor 30, a spindle 40, a rotary seal 50, a protected component 60, and a leak detection belt 70.

The front end of the housing 20 has a shaft hole 21, the interior of the housing 20 has a receiving groove 22 axially communicating with the shaft hole 21, and the rear end of the housing 20 has a positioning groove 23 in the shape of a ring at the groove wall of the receiving groove 22. By drilling the casing 20, as shown in fig. 2 and 3, the casing 20 forms a first groove 24, a second groove 25 and a drainage channel 26 in the groove wall of the containing groove 22, the extending direction of the first groove 24 is perpendicular to the axial direction of the shaft hole 21, the extending direction of the second groove 25 is perpendicular to the axial direction of the shaft hole 21, and the extending direction of the drainage channel 26 is parallel to the axial direction of the shaft hole 21, wherein the first groove 24 is closer to the shaft hole 21 than the second groove 25, that is, the first groove 24 is closer to the front end of the casing 20, the second groove 25 is closer to the rear end of the casing 20, and the second groove 25 is tangential to the positioning groove 23 for communication, and the front end and the rear end of the drainage channel 26 are respectively connected with the first groove 24 and the second groove 25. As shown in fig. 4, in the present embodiment, the distance between the first groove 24 and the receiving groove 22 is smaller than the distance between the second groove 25 and the receiving groove 22, so that the two grooves have a height difference, so as to facilitate the liquid flowing from the first groove 24 to the second groove 25 along the drainage channel 26. It should be noted that the first groove 24 and the second groove 25 may be designed to be located at the same height according to practical needs, and the drainage channel 26 is designed to have a slope, so that the distance between the drainage channel 26 and the receiving groove 22 gradually increases from the first groove 24 to the second groove 25, so that the liquid can be guided to flow from the first groove 24 to the second groove 25 along the drainage channel 26.

The motor 30 is installed in the container 22 of the housing 20 to provide a power source.

The spindle 40 is disposed through the receiving groove 22 of the housing 20 and connected to the motor 30, such that the spindle 40 can be driven by the motor 30 to rotate. As shown in fig. 4, the spindle 40 has a first end 41 and a second end 42, the first end 41 of the spindle 40 and the second end 42 of the spindle 40 are supported by a first bearing 44 and a second bearing 45, respectively, and the first end 41 of the spindle 40 is partially protruded from the housing 20 through the shaft hole 21 of the housing 20 and connected to a turntable 46, so that the spindle 40 can drive the turntable 46 to synchronously operate, and the second end 42 of the spindle 40 is connected to a stopper 47 provided at the rear of the motor 30, so that the spindle 40 can be decelerated or stopped by the control of the stopper 47. The outer peripheral surface of the first end 41 of the spindle 40 has an annular guiding portion 43, and the guiding portion 43 is located in the accommodating groove 22 of the housing 20.

As shown in fig. 4, the rotary seal 50 is disposed in the shaft hole 21 of the housing 20 and abuts against the outer peripheral surface of the first end 41 of the spindle 40, so as to block the liquid from entering the accommodating groove 22 through the shaft hole 21, and form a diversion channel 52 with the diversion portion 43 of the spindle 40, wherein the diversion channel 52 is communicated with the first groove 24 of the housing 20.

The protected component 60 is an encoder in this embodiment, but is not limited to an encoder in practice. As shown in fig. 4, the protected assembly 60 is mounted to the spindle 40 behind the deflector 43 of the spindle 40 (i.e., on the side of the deflector 43 facing away from the rotary seal 50). The outer diameter of the protected assembly 60 is smaller than the outer diameter of the deflector 43 of the mandrel 40.

The leak detection belt 70 is a product of model F03-16SF/16SFC manufactured by OMRON used in the present embodiment. As shown in fig. 2 to 4, the leak detection belt 70 is wrapped around the second end 42 of the spindle 40 and is embedded in the positioning groove 23 of the housing 20, so that the wrapping length of the leak detection belt 70 is longer than the circumference of the motor 30, and in addition, a part of the leak detection belt 70 is blocked in the second groove 25 of the housing 20 to detect whether the second groove 25 has liquid entering.

As shown in fig. 4, when the rotary seal 50 fails and liquid enters the container 22 from the shaft hole 21, the diversion portion 43 of the spindle 40 prevents the liquid from being directly sprayed onto the protected component 60, and directs the liquid into the first groove 24 via the diversion channel 52, and then the liquid reaches the second groove 25 along the drainage channel 26 to contact the leak detection belt 70, at this time, the leak detection belt 70 is triggered to change color and send a detection signal to a controller (not shown) to alert an operator of the leak condition and require immediate shutdown to avoid damage to critical components (such as the motor 30, the brake 47 or the protected component 60).

In addition, since the position of the leakage detecting belt 70 is close to the rear end of the housing 20, if the replacement is required, only a part of the components need to be removed from the rear end of the housing 20, and other components such as the turntable 46, the protected component 60, and the motor 30 are not affected, so that the re-calibration assembly step can be omitted, and the work efficiency can be improved. As for the position of the first groove 24, a leakage detecting belt 70 can be additionally arranged according to actual needs, and the detection accuracy can be further improved by virtue of the front and rear leakage detecting belts 70, so that operators can more accurately grasp the leakage condition. It should be noted that the leak detection belt 70 may not surround the spindle 40, but may be designed such that a segment thereof is directly caught in the second groove 25 of the housing 20.

It should be noted that, the flow guiding portion 43 may have different structural designs according to the nature of the liquid, and for the liquid with higher viscosity, the flow guiding portion 43 protrudes from one side surface of the back-to-back rotary seal 50 by an oblique angle portion 432 (as shown in fig. 5), or protrudes from one end thereof by a hook portion 434 toward the protected component 60 (as shown in fig. 6), so that the oblique angle portion 432 or the hook portion 434 provides a flow guiding effect for the liquid with higher viscosity; for the less viscous liquid, the guiding portion 43 protrudes from a side surface of the back-to-back rotary seal 50 to form an annular flange 436 (as shown in fig. 7) or is recessed with an annular groove 438 (as shown in fig. 8), and the labyrinth design formed by the cooperation of the annular flange 436 and the annular groove 438 with the corresponding concave-convex structure can protect the protected component 60, and provide the guiding effect for the less viscous liquid.

In summary, the rotary table 10 of the present invention uses the flow channel design with the height difference to guide the liquid entering the container 22 to the liquid leakage detection belt 70 directly avoiding the position of the critical components, and uses the liquid leakage detection belt 70 to detect whether the liquid leakage condition exists in real time, thereby achieving the effect of protecting the critical components, which is quite suitable for applications requiring liquid flushing or soaking (such as but not limited to an electric discharge machine). In addition, the technical features (i.e. the real-time detection of the height difference runner design and the liquid leakage detection belt 70) provided by the invention are not limited to being applied to a single-shaft horizontal workbench, but can also be applied to a single-shaft vertical workbench or a double-shaft vertical and horizontal workbench according to actual needs, and the liquid leakage detection function can be realized.

Claims

1. The rotary workbench with the liquid leakage detection function is characterized by comprising;

the shell is provided with a containing groove, the groove wall of the containing groove is provided with a first groove, a second groove and a drainage channel, and the front end and the rear end of the drainage channel are respectively connected with the first groove and the second groove;

a motor arranged in the containing groove of the shell;

the mandrel is rotatably arranged in the accommodating groove of the shell and connected with the motor, the mandrel is provided with a first end and a second end, and the outer peripheral surface of the first end of the mandrel is provided with a flow guiding part; and

the liquid leakage detection belt is arranged in the containing groove of the shell and provided with a part of the second groove clamped in the shell.

2. The rotary table of claim 1, wherein an outer diameter of the protected assembly is less than an outer diameter of the deflector portion of the spindle.

3. The rotary table of claim 1, wherein a distance between the first groove and the pocket is less than a distance between the second groove and the pocket.

4. A rotary table according to claim 3, wherein the extending direction of the first groove and the extending direction of the second groove are perpendicular to the axial direction of the shaft hole, and the extending direction of the guide passage is parallel to the axial direction of the shaft hole.

5. The rotary table of claim 1, wherein a distance between the guide channel and the vessel increases gradually from the first groove toward the second groove.

6. The rotary table of claim 1, wherein the front end of the housing has an axial hole, the receiving groove is axially connected to the housing, the first groove is closer to the axial hole than the second groove, the first end of the spindle protrudes out of the housing through the axial hole of the housing, and the guiding portion is located in the receiving groove of the housing.

7. The rotary table of claim 6, further comprising a rotary seal disposed in the shaft hole of the housing and abutting against the outer peripheral surface of the first end of the spindle, and forming a flow guide channel with the flow guide portion of the spindle, the flow guide channel communicating with the first groove of the housing.

8. The rotary table of claim 7, further comprising a protected assembly disposed on the spindle on a side of the deflector portion of the spindle opposite the rotary seal.

9. The rotary table of claim 7, wherein a side of the deflector opposite the rotary seal has any one of a beveled portion, an annular flange, and an annular groove.

10. The rotary table of claim 7, wherein one end of the guide portion protrudes toward the rotary seal member by a hook portion.