Liquid discharge structure for machine tools

Abstract

To provide a liquid discharge structure of a machine tool which dispenses with a power source, is saved in space, and possesses a liquid backflow prevention function.SOLUTION: A liquid discharge structure has a block-shaped main body 2 having a flow-in path 5 communicating with a liquid discharge port of a structure, and a discharge path 6 opened downward. An annular recessed groove 7 communicating with a terminal end part of the flow-in path 5 via a communication groove 8 is formed at the block-shaped main body 2. The discharge path 6 is formed so as to communicate with a part of the recessed groove 7 while making a phase of its upper end opening deviate from that of a recessed-groove side opening of the communication groove 8.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a liquid discharge structure provided at a liquid discharge port of a structural body of a machine tool. [Background technology]

[0002] Structures such as tool rests installed in the machining chamber of a machine tool use liquids such as lubricating oil, and the simplest structure for draining this liquid is to provide a drain port and drain it into the machining chamber.

[0003] However, the above structure has a problem in that the liquid flows back from the outlet and into the structure, causing damage to the structure.

[0004] Therefore, a method has been proposed in which a drain opening leading to the machining chamber is not provided in the structure in order to reliably prevent backflow, and the used lubricant is collected by a dedicated device. For example, Patent Document 1 proposes a lubricant collection device that includes a collection tank for collecting the discharged lubricant, a pump (suction device) for sucking the lubricant into a lubricant discharge path, and the like. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-126067 A Summary of the Invention [Problem to be solved by the invention]

[0006] Lubricating oil recovery devices such as those in Patent Document 1 above require a dedicated space for the lubricating oil recovery device, which results in a larger structure and increases the equipment costs for the power source of the suction device such as a pump. There are also problems with running costs for the power source and the device becoming more complex, requiring maintenance.

[0007] An object of the present invention is to provide a liquid drainage structure for a machine tool that does not require a power source, is space-saving, and has a function for preventing backflow of liquid. [Means for solving the problem]

[0008] A liquid drainage structure for a machine tool according to the present invention is a liquid drainage structure for draining liquid to the outside from a liquid drainage port provided in a structure of a machine tool, comprising: An inlet channel communicating with the liquid outlet of the structure And below A discharge passage opening toward the Cuboid Block-shaped body and the cover fixed to the front of the main unit. having the inlet passage extends from a start end opening communicating with the liquid outlet to a end end opening provided near the front surface of the main body, and the outlet passage extends from an upper end opening provided on the front surface of the main body and slightly above the bottom surface of the main body to a lower end opening opening on the bottom surface of the main body, before Notes a recessed groove communicating with a terminal end of the inlet passage via a communicating groove is provided in the body, the groove is provided on the front surface of the main body, the outer periphery of the groove is connected to the upper end opening of the discharge passage, and the inner periphery of the groove is formed to surround the terminal opening of the inlet passage, and the communication groove extends from the terminal opening of the inlet passage to a groove side opening that opens into the inner periphery of the groove, before The connecting groove The above Groove side opening from a position facing the upper end opening of the discharge passage Shift Te form The present invention is characterized in that it is constructed in such a manner.

[0009] The communicating groove and the recessed groove form a so-called labyrinth structure that has a backflow prevention function.

[0010] The block-shaped main body may be an integral part, or may be formed by joining two separate parts, for example. When divided into two parts, the block-shaped main body may be made up of an inlet passage, an outlet passage, a communication groove, and a recessed groove, and a cover that is attached to the main body with screws or the like and closes the openings of the outlet passage, the communication groove, and the recessed groove that open at one end of the main body.

[0011] The phase shift between the upper end opening of the discharge passage and the concave groove side opening of the communicating groove means that the upper end opening of the discharge passage and the concave groove side opening of the communicating groove are not opposite each other, and this can be achieved, for example, by arranging the communicating groove to extend horizontally and the discharge passage to extend vertically or diagonally.

[0012] The liquid discharged from the liquid outlet of the structure flows into the inlet channel provided in the block-shaped main body, flows from the end of the inlet channel through the communicating groove into the concave groove, and is discharged downward from the concave groove through the outlet channel. The liquid that flows back from the outlet channel spreads in the concave groove and is less likely to flow into the communicating groove, the opening of which is out of phase with the upper end opening of the outlet channel, thereby improving the effect of preventing the liquid from entering the liquid outlet of the structure.

[0013] A structure using this liquid discharge structure does not need to be maintained in a fixed position at all times, but may be one that rotates or moves linearly.

[0014] The inflow passage extends, for example, in the horizontal direction, but is not limited to this. The inflow passage may be inclined with respect to the horizontal direction, or may be L-shaped. The discharge passage preferably faces straight down when the structure is in its normal position, but may face obliquely downward.

[0015] The groove makes it difficult for liquid that flows back from the discharge channel to flow into the communicating groove by spreading out within the groove, thereby preventing the liquid from reaching the entrance of the inlet channel. For example, the groove may be annular and perpendicular to the direction of the inlet channel (for example, the horizontal direction), but is not limited to this and may be of various shapes as long as it allows liquid that flows back from the discharge channel to spread within the groove.

[0016] The communication groove may have one end opening that is connected to the terminal opening of the inflow passage and the other end opening that is connected to a part of the recessed groove. When the recessed groove is annular and perpendicular to the direction of the inflow passage, the communication groove can be formed by cutting a part of the block body that forms the inner circumference of the recessed groove (the recessed groove inner circumference forming part). There may be one communication groove or multiple communication grooves.

[0017] The discharge passage may have an upper end opening that communicates with a part of the recessed groove and a lower end opening that faces the lower surface of the block-shaped body. One or two discharge passages may be provided, and when two discharge passages are provided, they may be formed to be parallel to each other or to be formed in an inverted V shape. Here, if the recessed groove side opening of the communicating groove and the upper end opening of the discharge passage face each other, liquid that flows back from the discharge passage is likely to flow into the communicating groove, so these openings must be offset in phase with each other.

[0018] According to the liquid drainage structure for a machine tool of the present invention, a labyrinth structure is used to reliably drain liquid from the inside while preventing liquid from seeping in from the outside. Therefore, it is possible to obtain a liquid drainage structure for a machine tool that does not require a power source such as a pump, saves space, and has a function for preventing backflow of liquid.

[0019] It is preferable that the outer periphery of the recessed groove is formed in a circular shape. In order to achieve this, the recessed groove may be formed in a circular annular shape (the inner periphery is also circular), but the inner periphery does not have to be circular.

[0020] When the outer periphery of the annular groove is circular, the effect of guiding the flow of liquid that has entered through the outlet to follow the outer periphery is increased, making it difficult for liquid that has entered through the outlet to enter the communicating groove.

[0021] The shape of the groove is not limited to annular, but may be C-shaped or U-shaped, with the start and end sides of the groove leading to separate drainage paths. In this way, liquid that seeps in from the drainage path first hits the lower surface of the groove inner peripheral forming part that forms the inner peripheral surface of the groove, and is blocked by the lower surface of the groove inner peripheral forming part, making it difficult for the liquid to reach the communicating part. If the groove is shaped as annular and its outer periphery is circular, when the flow of liquid that seeps in from the drainage path is strong, the liquid can move along the outer periphery of the groove and return to the drainage path, making it even more difficult for the liquid to seep into the communicating groove.

[0022] Communication groove Central axis of is the inflow center axis line Same height as Alternatively, it is preferable that the inlet passage is formed below the central axis of the inlet passage. The first condition for the communication groove is that the opening is out of phase with the upper end opening of the discharge passage in order to prevent backflow from the discharge passage. The central axis of the connecting groove is Inflow center Against the axis Each other horizontal At the same height or The central axis of the connecting groove is the center of the inlet passage By satisfying the condition that the communicating groove is formed below the axis, the ability to drain liquid from the structure can be improved compared to when the communicating groove faces upward.

[0023] Connecting groove Based on the front of the unit The depth of the groove Based on the front of the unit It is preferable that the depth is shallower than the depth. In this way, liquid can easily flow from the inlet passage into the recessed groove, but it is difficult for liquid to seep into the recessed groove from the outlet passage, thereby enhancing the labyrinth effect. Effect of the Invention

[0024] According to the liquid drainage structure for a machine tool of the present invention, as described above, it is possible to obtain a liquid drainage structure for a machine tool that does not require a power source, saves space, and has a function for preventing backflow of liquid. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is an exploded perspective view showing a liquid discharge structure for a machine tool according to the present invention. [Diagram 2] FIG. 2 is a front view of the same. [Diagram 3] FIG. 3 is a vertical cross-sectional view passing through the center of FIG. [Figure 4] FIG. 4 is a horizontal cross-sectional view passing through the center of the top and bottom of FIG. [Diagram 5] FIG. 5 is a diagram in which arrows indicating the flow of the discharged liquid are added to FIG. [Figure 6] FIG. 6 is an additional figure to FIG. [Figure 7] FIG. 7 is an additional figure to FIG. [Figure 8] FIG. 8 is an additional figure to FIG. [Figure 9] FIG. 9 is a diagram in which arrows indicating the flow of liquid that has infiltrated from the outside are added to FIG. [Figure 10] FIG. 10 is an additional figure to FIG. [Figure 11] FIG. 11 is an additional figure to FIG. [Figure 12] FIG. 12 is an additional figure to FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, one embodiment of the liquid drainage structure (1) for a machine tool of the present invention will be described with reference to the drawings. In the following description, the side where the start end opening (5a) of the inlet passage (5) is provided is referred to as the rear, the side where the lower end (terminal end) opening (6b) of the drainage passage (6) is provided is referred to as the bottom, and left and right refer to the forward direction. These terms "up and down," "front and back," and "left and right" are for convenience and may be changed as appropriate according to the liquid drainage port provided in the structure of the machine tool, and may also change when the structure of the machine tool is changed in its position.

[0027] The liquid drainage structure (1) comprises a rectangular block-shaped main body (2) and a cover (3) fixed to the main body (2) with screws (4). Within the main body (2) are provided an inlet passage (5) communicating with a liquid drain outlet (not shown) of the machine tool structure, a drain passage (6) opening downward, and a recessed groove (7) communicating with the terminal end of the inlet passage (5) via left and right connecting grooves (8).

[0028] The main body (2) is attached to the structure so that its rear surface (2a) is in intimate contact with the surface of the structure on which the liquid outlet is provided. A start opening (5a) of the inflow channel (5) is provided in the center of the rear surface (2a), and the inflow channel (5) extends horizontally forward from the start opening (5a), with its end opening (5b) provided near the front surface (2b) of the main body (2) so as to communicate with a communication groove (8) described below.

[0029] The discharge passage (6) is provided in the center of the left and right sides of the front surface (2b) of the main body (2) so as to extend vertically, with its upper end opening (6a) located slightly above the lower surface (2c) of the main body (2) and its lower end opening (6b) opening into the lower surface (2c).

[0030] The groove (7) is provided in a circular shape on the front surface (2b) of the main body (2), and its outer periphery (7a) is formed to include the upper end opening (6a) of the discharge passage (6), and its inner periphery (7b) is formed to surround the terminal opening (5b) of the inlet passage (5).

[0031] The left and right communication grooves (8) extend horizontally to the left and right from the terminal opening (5b) of the inlet channel (5) and open into the inner circumference (7b) of the groove (7) by cutting the upper and lower central parts of the disk-shaped part (groove inner circumference forming part) (9) flush with the front surface (2b) of the main body (2) which forms the inner circumference of the groove (7) from end to end in the left and right direction (horizontal radial direction). Has a groove side opening (8a) It is formed as follows. 2, the communication groove (8) extends horizontally perpendicular to the inflow passage (5) which has a circular cross section and extends horizontally, and its central axis extending in the left-right direction is positioned at the same height as the central axis of the inflow passage (5). As described above, in order to improve the discharge performance of the fluid by positioning the communication groove (8) below the inflow passage (5), the central axis extending in the left-right direction of the communication groove (8) may be formed below the central axis of the inflow passage (5).

[0032] As shown in Figure 3, Discharge channel (6) Based on the front surface of the main body (2b) The depth of the groove (7) Based on the front surface of the main body (2b) The depth of the connecting groove (8) is shallower than that of the connecting groove (8). Based on the front surface of the main body (2b) The depth of the groove (7) Based on the front surface of the main body (2b) As a result, liquid flowing into the recessed groove (7) from the discharge passage (6) spreads within the recessed groove (7), and liquid flowing into the recessed groove (7) from the communicating groove (8) also spreads within the recessed groove (7). Based on the front surface of the main body (2b) The depth of the discharge channel (6) Based on the front surface of the main body (2b) It is made slightly deeper than the original depth.

[0033] The discharge passage (6), the recessed groove (7) and the communication groove (8) open to the front surface (2b) of the main body (2), and these openings are closed by the cover (3). Therefore, the only openings exposed to the outside of the main body (2) are the inlet passage (5) opening to the rear surface (2a) of the main body (2) and the discharge passage (6) opening to the bottom surface (2c) of the main body (2).

[0034] According to the liquid drainage structure (1) of this embodiment, as shown by the two-dot chain arrows in Figures 5 to 8, liquid discharged from the structure and entering the inlet channel (5) is split into left and right at the end opening (5b) and enters the left and right communicating grooves (8), respectively, from which it enters the recessed groove (7) and is discharged from the discharge channel (6). Since gravity acts on the liquid, it is difficult for the liquid to flow into the portion of the annular recessed groove (7) above the communicating groove (8). In this way, the liquid discharged from the liquid drainage port of the machine tool structure is reliably discharged through the main body (2).

[0035] The liquid that flows back from the discharge passage (6) and enters the recessed groove (7) hits the outer peripheral surface of the disk-shaped portion (9) of the main body (2) that forms the inner peripheral surface of the recessed groove (7), and is difficult to penetrate into the communicating groove (8), and is discharged from the discharge passage (6) by its own weight when the upward force acting on the liquid is weak. When the upward force acting on the liquid that has entered the recessed groove (7) from the discharge passage (6) is strong, the liquid is moved along the outer peripheral surface of the recessed groove (7) after hitting the disk-shaped portion (9) as shown by the two-dot chain arrows in Figures 9 to 12, and returns to the discharge passage (6). Since the liquid on the way back is hardly subjected to a horizontal inward force, even if it exceeds the height of the communicating groove (8), it hardly penetrates into the communicating groove (8), and is reliably prevented from penetrating into the structural body of the machine tool via the inflow passage (5).

[0036] The communicating groove (8) and the recessed groove (7) in the above embodiment form a labyrinth structure for preventing backflow, and can reliably prevent backflow of liquid from the discharge path (6). This makes it possible to prevent damage to the structure due to backflow even if a discharge port leading to the processing chamber is provided in the structure, thereby realizing space saving and cost reduction compared to a structure in which the lubricating oil is collected using a suction device such as a pump without a discharge port.

[0037] Although not shown in the figures, in the liquid discharge structure (1) of the above embodiment, the shapes of the inlet passage (5), the discharge passage (6), the recessed groove (7) and the communicating groove (8) can of course be modified in various ways as long as they are capable of preventing backflow of liquid from the discharge passage (6). [Explanation of symbols]

[0038] (1):Liquid discharge structure (2): Main unit (5):Inflow channel (6):Exhaust channel (6a):Top opening (6b): Bottom opening (7): Groove (7a):Outer circumference (8):Communication groove

Claims

1. A liquid discharge structure for discharging liquid to the outside from a liquid discharge port provided in a structure of a machine tool, a rectangular parallelepiped block-shaped main body provided with an inlet passage communicating with the liquid outlet of the structure and a discharge passage opening downward, and a cover fixed to a front surface of the main body; the inlet passage extends from a start end opening communicating with the liquid outlet to a end end opening provided near the front surface of the main body, and the outlet passage extends from an upper end opening provided on the front surface of the main body and slightly above the bottom surface of the main body to a lower end opening opening on the bottom surface of the main body, The main body is provided with a groove communicating with a terminal end of the inlet passage via a communication groove, the groove is provided on a front surface of the main body, the outer periphery of the groove is connected to the upper end opening of the outlet passage, and the inner periphery of the groove is formed so as to surround the terminal opening of the inlet passage, and the communication groove extends from the terminal opening of the inlet passage to a groove side opening that opens into the inner periphery of the groove, A liquid drainage structure for a machine tool, characterized in that the opening of the communicating groove on the recessed groove side is formed at a position offset from a position facing the upper end opening of the drainage passage.

2. 2. The liquid drainage structure for a machine tool according to claim 1, wherein the groove is formed in an annular shape, and the outer periphery of the groove is formed in a circular shape.

3. A liquid drainage structure for a machine tool as described in claim 1 or 2, characterized in that the inlet passage has a circular cross section and extends horizontally, the communicating groove extends horizontally perpendicular to the inlet passage, and the central axis of the communicating groove is formed at the same height as the central axis of the inlet passage or below that central axis.

4. A liquid drainage structure for a machine tool as described in any one of claims 1 to 3, characterized in that the depth of the communicating groove based on the front surface of the main body is shallower than the depth of the concave groove based on the front surface of the main body.

5. A liquid drainage structure for a machine tool as described in any one of claims 1 to 4, characterized in that the depth of the drainage path based on the front surface of the main body is shallower than the depth of the groove based on the front surface of the main body.

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