JP2023104617A - Rotary work table with leak detection function - Google Patents

Abstract

To provide a rotary work table with a leak detection function.SOLUTION: The rotary work table with a leak detection function comprises a housing, a spindle, and a leak detection belt. The housing includes a storage groove, a first groove, a second groove, and a fluid guiding passage that connects the first and second grooves. The spindle is mounted in the inside of the housing, and has a channelizing part. The leak detection belt is disposed inside of the storage groove of the housing, and fits into the second groove. Owing to the above mentioned structural feature, when a liquid flows into the housing, the channelizing part of the spindle causes the liquid to flow to the first groove. Subsequently, when the liquid flowing in the first groove flows into the second groove along the fluid guiding passage, the leak detection belt detects a leak, enabling important components to be reliably protected.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to a rotary workbench, and more particularly to a rotary workbench with a leak detection function.

In the leak detection system disclosed by U.S. Pat. No. 5,400,000, a sensor is placed between the bearing structure and the sealing system to detect whether or not the coolant leaks. When the sensor detects that the coolant has leaked, the leaked coolant has already passed through the bearing structure, which is likely to cause trouble in the bearing structure. There is room for improvement in the leak detection system disclosed by US Pat.

US Pat. No. 7,692,553 B2

SUMMARY OF THE INVENTION The main object of the present invention is to provide a rotary workbench with a leakage detection function that prevents liquid from entering the interior and damaging important parts.

A rotary workbench with a leak detection function for solving the above-mentioned problems comprises a housing, a motor, a mandrel and a leak detection belt. The housing has a containment groove, a first groove disposed in the containment groove, a second groove and a fluid guide passage. Both front and rear ends of the fluid guiding passage are separately connected to the first groove and the second groove. A motor is mounted in a housing groove in the housing to provide power. The mandrel is rotatably mounted in the storage groove of the housing, and is connected to the motor to receive the driving force of the motor and rotate. The mandrel has a first end, a second end and a flow guide formed on the outer circumference of the first end. The leak detection belt is positioned within the storage groove of the housing and partially fits into the second groove of the housing.

Due to the structural features described above, when liquid enters the containment groove, the mandrel's flow guide directs the liquid to the first groove. Subsequently, when the liquid travels along the fluid guide path to the second groove and contacts the leak detection belt, the leak detection belt sends a detection signal to the controller to stop the operation of the operator, so that the liquid enters inside. It is possible to suppress damage to important parts such as motors due to infiltration.

In a relatively preferred case, the housing has an axial hole at its front end. The storage groove is connected to the housing along the axial direction. The first groove is closer to the shaft hole than the second groove. A first end of the mandrel passes through an axial hole in the housing and partially protrudes into the housing. The flow guide is located within the containment groove of the housing.

In a relatively preferred case, the rotary worktable further comprises a rotary sealing unit. The rotary sealing unit is mounted in the axial hole of the housing and abuts on the outer peripheral surface of the first end of the mandrel to form a conducting passage between the mandrel and the conducting portion of the mandrel. The guide channel is connected to the first groove of the housing. When the rotary sealing unit is deactivated to allow liquid to flow into the containment groove, the diverting portion of the mandrel allows liquid to flow into the first groove through the diverting passageway. Subsequently, the liquid that has flowed into the first groove flows into the second groove along the fluid guide passage and contacts the leak detection belt.

In relatively favorable cases, the rotary worktable further comprises a part to be protected. Since the part to be protected is mounted on the mandrel and positioned on one side of the diverter of the mandrel with its back to the rotary sealing unit, the diverter restrains the liquid from splashing onto the part to be protected. can be done.

In a relatively favorable case, the part to be protected has an outer diameter smaller than the outer diameter of the guide section of the mandrel. Prevent liquid from entering the protected part by designing the part to be protected and the guide part to be different in size.

In a relatively preferred case, the distance between the first groove and the storage groove is less than the distance between the second groove and the storage groove. The design with a height difference between the two guides the liquid smoothly.

In a relatively preferred case, the first and second grooves are machined so that their extension direction is perpendicular to the axial direction of the mandrel. The fluid guide is processed so that the direction of elongation is parallel to the axial direction of the mandrel. The structural features described above are completed by drilling the housing.

In a relatively preferred case, the first and second grooves are machined so that their extension direction is perpendicular to the axial direction of the mandrel. The structural features described above are completed by drilling the housing. If the distance between the fluid guide passage and the storage groove is gradually increased from the first groove to the second groove and a slope is formed in the fluid guide passage, the liquid can be guided smoothly.

In a relatively favorable case, the flow guide is modified according to the properties of the liquid. If the viscosity of the liquid is relatively high, one side of the guide part facing the rotary sealing unit is protruded to form an inclined angle, or one end of the guide part is protruded along the direction of the rotary sealing unit. If the hook is formed by letting the slanted corner portion or the hook form, a flow guide effect is produced for the liquid having a relatively high viscosity. If the viscosity of the liquid is relatively low, one side of the flow guiding part facing the rotary sealing unit may be protruded to form an annular projection or recessed to form an annular groove, thereby forming an annular projection. Since the annular groove forms a labyrinth with the uneven structure corresponding to each other, it can reliably protect the parts to be protected, and at the same time, can produce a flow guide effect for a liquid with relatively low viscosity.

The detailed structure, features, assembly or method of use of the rotary workbench with leak detection function according to the present invention will be clarified through the detailed description of the embodiments below. It should be noted that the following detailed description and the embodiments disclosed by the present invention are merely examples for explaining the present invention, and that the scope of the claims of the present invention cannot be limited. Then you should be able to understand.

1 is a perspective view showing a rotary workbench with a leak detection function according to one embodiment of the present invention; FIG. FIG. 4 is a cross-sectional view showing a portion of the rotary workbench with leak detection function according to one embodiment of the present invention, ie, the positions of the first groove, the second groove and the fluid guide passage; FIG. 4 is a side view showing positions of a first groove, a second groove and a fluid guide passage of the rotary workbench with leak detection function according to one embodiment of the present invention; 1 is a cross-sectional view showing a rotary workbench with a leak detection function according to one embodiment of the present invention; FIG. FIG. 5 is a cross-sectional view showing a portion of the mandrel and the part to be protected when the flow guiding portion of the mandrel corresponds to another embodiment in the rotary workbench with leak detection function according to one embodiment of the present invention; FIG. 5 is a cross-sectional view showing a portion of the mandrel and the part to be protected when the flow guiding portion of the mandrel corresponds to another embodiment in the rotary workbench with leak detection function according to one embodiment of the present invention; FIG. 5 is a cross-sectional view showing a portion of the mandrel and the part to be protected when the flow guiding portion of the mandrel corresponds to another embodiment in the rotary workbench with leak detection function according to one embodiment of the present invention; FIG. 5 is a cross-sectional view showing a portion of the mandrel and the part to be protected when the flow guiding portion of the mandrel corresponds to another embodiment in the rotary workbench with leak detection function according to one embodiment of the present invention;

Hereinafter, a rotating workbench with a leak detection function according to the present invention will be described with reference to the drawings. In the specification and drawings, directional terms are expressed based on the directions in the drawings. The same reference numerals indicate structural features of the same or similar parts.

(one embodiment)
As shown in FIGS. 1 and 4, the rotary workbench 10 according to the present invention takes a single-axis horizontal table as an example and comprises a housing 20, a motor 30, a spindle 40, a rotary sealing unit 50, a part to be protected 60 and a leak detection. A belt 70 is provided.

The housing 20 has an axial hole 21 , a storage groove 22 and an annular positioning groove 23 . A shaft hole is formed in the front end of the housing 20 . A storage groove 22 is formed inside the housing 20 and communicates with the shaft hole 21 along the axial direction. An annular positioning groove 23 is formed at the rear end of the housing 20 and on the wall surface of the housing groove 22 .
Subsequently, as shown in FIGS. 2 and 3, the housing 20 further has a first groove 24, a second groove 25 and a fluid guide passage 26. As shown in FIG. The first groove 24 , the second groove 25 and the fluid guide passage 26 are formed inside the wall surface of the housing groove 22 by drilling the housing 20 . The extending direction of the first groove 24 and the second groove 25 is perpendicular to the axial direction of the shaft hole 21 . The extending direction of the fluid guide passage 26 is parallel to the axial direction of the shaft hole 21 . The first groove 24 is closer to the shaft hole 21 than the second groove 25 is. That is, the first groove 24 is near the front end of the housing 20 . The second groove 25 is near the rear end of the housing 20 . The second groove 25 and the annular positioning groove 23 are connected to form a tangent line. The fluid guide passage 26 has a front end connected to the first groove 24 and a rear end connected to the second groove 25 .
As shown in FIG. 4 , in this embodiment, the distance between the first groove 24 and the storage groove 22 is less than the distance between the second groove 25 and the storage groove 22 . That is, if there is a height difference between the two, the liquid can smoothly flow from the first groove 24 to the second groove 25 along the fluid guide passage 26 . In addition, if the first groove 24 and the second groove 25 are positioned at the same height and the fluid guide passage 26 is inclined according to actual needs, the distance between the fluid guide passage 26 and the storage groove 22 can be increased. Since the liquid gradually increases along the direction from the first groove 24 to the second groove 25 , the liquid can flow from the first groove 24 to the second groove 25 along the fluid guide passage 26 .

A motor 30 is mounted within the housing groove 22 of the housing 20 to provide power.

The mandrel 40 is rotatably mounted in the storage groove 22 of the housing 20 and is connected to the motor 30 to receive the driving force of the motor 30 and rotate.
As shown in FIG. 4, mandrel 40 has a first end 41 and a second end 42 . Mandrel 40 is supported at first end 41 by first bearing 44 and at second end 42 by second bearing 45 . The first end 41 of the mandrel 40 passes through the shaft hole 21 of the housing 20 and partially protrudes into the housing 20 to be connected to the rotating disc 46 , so that the mandrel 40 can synchronously operate the rotating disc 46 .
A second end 42 of the axle 40 is connected to a brake 47 behind the motor 30 so that the axle 40 can slow down or come to an emergency stop under the control of the brake 47 . The mandrel 40 further has a guide portion 43 formed in an annular shape on the outer peripheral surface of the first end 41 . The guide part 43 is positioned within the housing groove 22 of the housing 20 .

As shown in FIG. 4, the rotary seal unit 50 is mounted within the axial bore 21 of the housing 20 to inhibit liquid from entering the containment groove 22 through the axial bore 21 and is mounted at the first end 41 of the mandrel 40 . A guide passage 52 is provided between the guide portion 43 of the mandrel 40 and the outer peripheral surface of the mandrel 40 . The guide channel 52 is connected to the first groove 24 of the housing 20 .

As shown in FIG. 4, the part to be protected 60 is mounted on the mandrel 40 and positioned behind the diverter 43 (ie, the side of the diverter 43 facing away from the rotary seal unit 50). The outer diameter of the part 60 to be protected is smaller than the outer diameter of the guide portion 43 of the mandrel 40 . In this embodiment, the part to be protected 60 is an encoder, but is not limited to this.

As shown in FIGS. 2 to 4 , the leak detection belt 70 is annularly arranged on the second end 42 of the housing 20 and fits into the positioning groove 23 of the housing 20 . The leak detection belt 70 has a length that goes around the second end 42 of the housing 20 longer than the circumference of the motor 30 . Since a part of the leak detection belt 70 fits into the second groove 25 of the housing 20 , it is possible to detect whether or not liquid has entered the second groove 25 . In this embodiment, the leak detection belt 70 is a product of OMRON (product number F03-16SF/16SFC).

Due to the features of the structure described above, as shown in FIG. 4, when the swivel sealing unit 50 loses its effectiveness and causes liquid to flow from the shaft hole 21 into the storage groove 22, the flow guiding portion 43 of the mandrel 40 repels the liquid. While preventing the part 60 to be protected from being splashed, the guide passage 52 allows the liquid to flow into the first groove 24 . Subsequently, the liquid that has flowed into the first groove 24 flows along the fluid guide passage 26 into the second groove 25 and contacts the leak detection belt 70 . Subsequently, the leakage detection belt 70 changes color and sends a detection signal to the controller (not shown in the figure) to force the worker to stop the operation. Alternatively, it is possible to suppress damage to important parts such as the part 60 to be protected.

The leak detection belt 70 is positioned near the rear end of the housing 20 . When replacing the leakage detection belt 70, it is only necessary to remove a part of the rear end parts of the housing 20, such as the rotating disk 46, the protected part 60, or the motor 30, so there is no need to redo the entire assembly work. , can improve work efficiency. The present invention can additionally add a leakage detection belt 70 around the first groove 24 according to the actual situation. The operator can improve the detection accuracy by using the front and rear leak detection belts 70 and can reliably grasp the leak state. The leak detection belt 70 is annularly arranged on the mandrel 40 , but is not limited to this, and may be fitted into the second groove 25 of the housing 20 .

The structure of the guide part 43 may be changed according to the properties of the liquid. When the viscosity of the liquid is relatively high, one side surface of the guide portion 43 facing the rotary sealing unit 50 is protruded to form an inclined angle portion 432 (see FIG. 5), or one end of the guide portion 43 is protruded. If hooks 434 (see FIG. 6) are formed by protruding along the direction of the part 60 to be protected, the beveled corners 432 or the hooks 434 can induce a flow guide effect for a liquid with a relatively high viscosity.
When the viscosity of the liquid is relatively low, one side of the guide part 43 facing the rotary sealing unit 50 is protruded to form an annular projection 436 (see FIG. 7) or recessed to form an annular groove 438 . (see FIG. 8), the annular convex portion 436 and the annular groove 438 form a labyrinth with corresponding concave-convex structures. can produce a guiding effect.

In summary, the rotary worktable 10 according to the present invention is designed with a height difference in the flow path, so that the liquid in the storage groove 22 does not approach the part where the important parts are arranged, and flows directly to the leak detection belt 70. Then, the leakage detection belt 70 immediately detects whether or not the liquid has entered the interior. aircraft exclusion).
The present invention, which is technically characterized by adopting a design with a height difference in the flow path and an immediate detection method by the leakage detection belt 70, is applied to a single-axis horizontal table, but is not limited to this. It can be applied to single-axis vertical table or double-axis vertical horizontal table to provide leak detection function.

REFERENCE SIGNS LIST 10 rotating workbench 20 housing 21 shaft hole 22 storage groove 23 annular positioning groove 24 first groove 25 second groove 26 fluid guiding passage 30 motor 40 mandrel 41 first end 42 second end 43 guide part 432 slope angle part 434 Hook 436 Annular convex portion 438 Annular concave groove 44 First bearing 45 Second bearing 46 Rotating disk 47 Brake 50 Rotating sealing unit 52 Guide passage 60 Part to be protected 70 Leak detection belt

In a relatively preferred case, the first and second grooves are machined so that their extension direction is perpendicular to the axial direction of the mandrel. The fluid guiding passages are machined so that their extending directions are parallel to the axial direction of the mandrel. The structural features described above are completed by drilling the housing.

Claims (5)

Equipped with housing, motor, mandrel and leak detection belt,
The housing has a storage groove, a first groove and a second groove formed in the wall surface of the storage groove, and a fluid guide passage, and both front and rear ends of the fluid guide passage are connected to the first groove and the second groove. connected separately,
the motor is mounted within the housing groove of the housing;
said axle is rollably mounted in said housing groove and connected to said motor;
the mandrel has a first end, a second end, and a guide portion formed on the outer peripheral surface of the first end;
The leak detection belt is placed in the storage groove of the housing, and a part of it fits into the second groove of the housing,
Rotating workbench with leak detection function. 2. The rotating workbench with leak detection function according to claim 1, further comprising a part to be protected, the outside diameter of said part to be protected being smaller than the outside diameter of said guide portion of said mandrel. 2. The rotating workbench with leakage detection function according to claim 1, wherein the distance between the first groove and the storage groove is smaller than the distance between the second groove and the storage groove. The housing has an axial hole at its front end, the first groove and the second groove extend in a direction perpendicular to the axial direction of the axial hole, and the fluid guide extends in a direction parallel to the axial direction of the axial hole. The rotary workbench with a leak detection function according to claim 3, characterized in that: The housing has an axial hole at its front end, the housing groove is connected to the housing along the axial direction, the first groove is closer to the axial hole than the second groove, and the first groove of the mandrel is 2. The leak detection device according to claim 1, wherein the end penetrates the shaft hole of the housing and partially protrudes into the housing, and the guide part is positioned in the housing groove of the housing. Rotating workbench with function.

Images