Dragging cooling system of vertical machining center

Abstract

The utility model relates to a dragging cooling system of a vertical machining center, and belongs to the technical field of machine tool cooling systems. The vertical machining center is provided with an X-axis transmission lead screw, a Y-axis transmission lead screw and a Z-axis transmission lead screw, a refrigerating machine is arranged outside the machine tool, an outlet of the refrigerating machine is connected with an oil outlet four-way joint through a ball valve, and three output ends of the oil outlet four-way joint are connected with oil inlet pipelines respectively. Each oil inlet pipeline is connected with liquid inlet connectors of cooling end covers of the X-axis transmission lead screw, the Y-axis transmission lead screw and the Z-axis transmission lead screw, oil passes through the hollow lead screw and flows out of liquid return connectors of backflow end covers, the liquid return connectors are connected with oil return pipelines, and the four oil return pipelines are connected with an inlet of the refrigerating machine through an oil return four-way joint. According to the cooling system, the X-axis transmission lead screw, the Y-axis transmission lead screw and the Z-axis transmission lead screw are used as a whole for cooling circulation, thermal deformation is consistent, and therefore unified cooling calculation of the machine tool motion axis is achieved, and the machining precision is improved.

Description

Technical Field

[0001] The utility model relates to a drag cooling system for a vertical machining center, belonging to the technical field of machine tool cooling systems. Background Art

[0002] For the current technological development, although the structure of the vertical machining center is already relatively common, how to make the machining accuracy of the vertical machining center higher is still a problem that restricts the further development of the technology. In the study, it was found that the drive structure is the power source of the overall structure of the vertical machining center. The heat after startup will cause thermal deformation of the parts, affecting the operating accuracy of the overall structure, and will have a certain impact on the accuracy of the vertical machining center. Therefore, improving the heat dissipation of the drive structure has become a necessary issue.

[0003] Therefore, how to provide a circulating cooling system for the transmission structure of a vertical machining center is a problem that needs to be solved urgently by those skilled in the art. Most of the existing technical solutions use air cooling to cool the transmission system, but the thermal conductivity of air cooling is lower than that of liquid cooling, and sometimes it cannot meet the temperature reduction standard, resulting in an out-of-control state of temperature reduction. In the liquid cooling solution, the existing technology mostly imposes arbitrary constraints on the screw drag system of a single axis. Since the machine tool system works in a multi-axis linkage, this type of temperature regulation may cause the entire machine tool system to work in an uncoordinated manner, that is, the effects of adjusting one axis and another axis are not equal, resulting in uncalculated thermal deformation of the entire machine tool system. There is an urgent need for a systematic and reasonable unified cooling design for the entire machine tool motion axis to meet the increasingly high requirements for equipment processing accuracy. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a drag cooling system for a vertical machining center, which performs cooling circulation on the drive screws of the X-axis, Y-axis and Z-axis as a whole, with consistent thermal deformation, thereby realizing unified cooling calculation for the motion axes of the machine tool and improving machining accuracy.

[0005] To solve the above problems, the specific technical solutions of the utility model are as follows: a drag cooling system for a vertical machining center, the vertical machining center is provided with an X-axis transmission screw, a Y-axis transmission screw and a Z-axis transmission screw, a refrigerator is arranged outside the machine tool, the outlet of the refrigerator is connected to an oil outlet four-way through a ball valve, the three output ends of the oil outlet four-way are respectively connected to the oil inlet pipeline, each oil inlet pipeline is respectively connected to the liquid inlet joint of the cooling end cover of the X-axis transmission screw, the Y-axis transmission screw and the Z-axis transmission screw, the oil passes through the hollow screw and flows out from the return liquid joint of the reflux end cover, the return liquid joint is connected to the return oil pipeline, and the four return oil pipelines are connected to the inlet of the refrigerator through the oil return four-way.

[0006] One end of the hollow screw is coaxially matched with the cooling end cover, the cooling end cover is provided with a radial through hole, and a plurality of liquid inlet holes are provided on the hollow screw, and the through holes of the cooling end cover correspond to the positions of the liquid inlet holes of the hollow screw; the through holes of the cooling end cover are coaxially matched with the hollow screw through rotating sealing rings on both sides, and the rotating sealing rings are positioned by retaining rings; a bearing seat is provided at the connecting end of the hollow screw and the motor, and a pressure cover is provided between the bearing group in the bearing seat and the cooling end cover, and the pressure cover and the cooling end cover are connected by bolts.

[0007] A bearing seat is provided at the end of the hollow screw away from the motor, and the tail end of the hollow screw cooperates with the bearing group in the bearing seat. A pressure cover is provided at the outer end of the bearing group, and the pressure cover is coaxially matched with the hollow screw through a rotating sealing ring; the outer end of the pressure cover is sealed and connected to the reflux end cover, and the reflux end cover is provided with a liquid return joint; the inner cavity of the reflux end cover is connected to the inner hole of the hollow screw.

[0008] The diameter of the oil inlet pipeline is φ10mm; the diameter of the oil return pipeline is φ12mm.

[0009] The drag cooling system of the vertical machining center adopts the above structure and has the following advantages:

[0010] 1. Unified heat dissipation treatment of the drive structure to ensure consistent thermal deformation, so as to improve the operating accuracy of the overall structure of the vertical machining center;

[0011] 2. The cooling machine power and cooling pipe diameter are fully matched to improve the overall operating efficiency of the system;

[0012] 3. The cooling end cover and the return end cover are designed with liquid inlet joint and liquid return joint respectively to ensure the sealing performance during the operation of the coolant. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Drag the front view of the cooling system for the vertical machining center.

[0014] Figure 2 Side view of a drag coolant system for a vertical machining center.

[0015] Figure 3 This is a connection diagram of the drag cooling system for a vertical machining center.

[0016] Figure 4 for Figure 3 A partial enlarged view of point A.

[0017] Figure 5 for Figure 3 A partial enlarged view of point B. DETAILED DESCRIPTION

[0018] like Figures 1 to 3As shown, a drag cooling system for a vertical machining center has the following structure: the vertical machining center is provided with an X-axis transmission screw, a Y-axis transmission screw and a Z-axis transmission screw, a refrigerator 1 is arranged outside the machine tool, the outlet of the refrigerator 1 is connected to an oil outlet cross-way 3 through a ball valve 2, the three output ends of the oil outlet cross-way 3 are respectively connected to an oil inlet pipeline 4, each oil inlet pipeline 4 is respectively connected to a liquid inlet joint 5 of a cooling end cover 11 of the X-axis transmission screw, the Y-axis transmission screw and the Z-axis transmission screw, the oil passes through a hollow screw 16 and flows out from a return liquid joint 7 of a return end cover 19, the return liquid joint 7 is connected to an oil return pipeline 8, and four oil return pipelines 8 are connected to the inlet of the refrigerator 1 through an oil return cross-way 9.

[0019] The power of refrigerator 1 is calculated by the following formula:

[0020]

[0021] Among them, ρ represents the density of oil, which is 800kg / m3; the minimum requirement for flow rate v should be 0.15m³ / h; the specific heat of oil Cp is 1.8kJ / (kg·K); the temperature rise of the screw is 8K; the power Q is 1728W, so the oil cooler with a refrigeration capacity of 2.5KW is finally selected as the refrigeration power source. The diameter of the oil inlet pipeline 4 is φ10mm; the diameter of the oil return pipeline 8 is φ12mm, which can ensure that the flow rate reaches the standard and thus ensure the refrigeration effect. The tetrafluoroethylene tube is easy to clean, corrosion-resistant, and can withstand high temperatures. It is suitable for the transportation of coolant in this system. The pipe joints use copper ferrule joints, which reduce the wear of the pipe on the basis of pressure resistance.

[0022] like Figure 4 As shown, one end of the hollow screw 16 is coaxially matched with the cooling end cover 11, and the cooling end cover 11 is provided with a radial through hole, and a plurality of liquid inlet holes are provided on the hollow screw 16, and the through holes of the cooling end cover 11 correspond to the positions of the liquid inlet holes of the hollow screw 16; the rotating sealing ring 12 is coaxially matched with the hollow screw 16 on both sides of the through hole of the cooling end cover 11, and the rotating sealing ring 12 is positioned by the retaining ring 13, and the rotating sealing ring 12 ensures that the coolant enters the hollow screw and has a good sealing performance with the outside; a bearing seat is provided at the connecting end of the hollow screw 16 and the motor, and a pressure cover 15 is provided between the bearing group 17 in the bearing seat and the cooling end cover 11, and the pressure cover 15 and the cooling end cover 11 are connected by bolts, and the axial positioning of the bearing group 17 is achieved by the limit sleeves provided on the pressure cover 15 and the hollow screw 16.

[0023] like Figure 5As shown, a bearing seat 18 is provided at one end of the hollow screw 16 away from the motor, and the tail end of the hollow screw 16 cooperates with the bearing group 17 in the bearing seat 18. A pressure cover 15 is provided at the outer end of the bearing group 17, and the pressure cover 15 is coaxially matched with the hollow screw 16 through a rotating sealing ring 12; the outer end of the pressure cover 15 is sealed and connected to the reflux end cover 19, and the reflux end cover 19 is provided with a liquid return connector 7; the inner cavity of the reflux end cover 19 is communicated with the inner hole of the hollow screw 16, and the coolant flowing out of the tail end of the hollow screw 16 is concentrated in the sealed inner cavity of the reflux end cover 19 through the tail reflux end cover 19, and refluxes through the liquid return connector 7.

Claims

1. A drag cooling system for a vertical machining center, Features: The vertical machining center is provided with an X-axis transmission screw, a Y-axis transmission screw and a Z-axis transmission screw. A refrigerator (1) is arranged outside the machine tool. The outlet of the refrigerator (1) is connected to an oil outlet four-way (3) through a ball valve (2). The three output ends of the oil outlet four-way (3) are respectively connected to oil inlet pipelines (4). Each oil inlet pipeline (4) is respectively connected to a liquid inlet joint (5) of a cooling end cover (11) of the X-axis transmission screw, the Y-axis transmission screw and the Z-axis transmission screw. The oil passes through a hollow screw (16) and flows out from a liquid return joint (7) of a return end cover (19). The liquid return joint (7) is connected to an oil return pipeline (8). The four oil return pipelines (8) are connected to the inlet of the refrigerator (1) through an oil return four-way (9).

2. The vertical machining center drag cooling system according to claim 1, Features: One end of the hollow screw (16) is coaxially matched with the cooling end cover (11), the cooling end cover (11) is provided with a radial through hole, and a plurality of liquid inlet holes are provided on the hollow screw (16), and the through holes of the cooling end cover (11) correspond to the positions of the liquid inlet holes of the hollow screw (16); a rotating sealing ring (12) is coaxially matched with the hollow screw (16) on both sides of the through hole of the cooling end cover (11), and the rotating sealing ring (12) is positioned by a retaining ring (13); a bearing seat is provided at the connection end of the hollow screw (16) and the motor, and a pressure cover (15) is provided between the bearing group (17) in the bearing seat and the cooling end cover (11), and the pressure cover (15) and the cooling end cover (11) are connected by bolts.

3. The vertical machining center drag cooling system according to claim 1, Features: A bearing seat (18) is provided at one end of the hollow screw (16) away from the motor. The tail end of the hollow screw (16) cooperates with the bearing group (17) in the bearing seat (18). A gland (15) is provided at the outer end of the bearing group (17). The gland (15) is coaxially matched with the hollow screw (16) via a rotating sealing ring (12). The outer end of the gland (15) is sealed and connected to a return end cover (19). The return end cover (19) is provided with a return liquid joint (7). The inner cavity of the return end cover (19) is communicated with the inner hole of the hollow screw (16).

4. The drag cooling system for a vertical machining center according to claim 1, Features: The diameter of the oil inlet pipeline (4) is φ10 mm; the diameter of the oil return pipeline (8) is φ12 mm.

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