Main shaft cooling system and machining center

Abstract

The utility model relates to the field of machine tool equipment, in particular to a spindle cooling system and a machining center, which are characterized in that one end of a backflow loop is connected with a liquid inlet of a spindle, and a suction structure is arranged on the backflow loop. Residual cooling liquid in the center hole of the spindle is sucked out of the spindle through the suction structure, and therefore the phenomenon that the spindle drips water is avoided.

Description

Technical Field

[0001] The utility model relates to the field of machine tool equipment, in particular to a spindle cooling system and a machining center. Background Art

[0002] In the process of machine tool processing, in order to solve the problem of heat generation of the tool or workpiece, the center of the processing shaft 200 is set as a through-hole structure, and then coolant is transported to the center hole of the processing shaft 200 to cool the processing shaft 200, the tool or the workpiece. This cooling method is increasingly used in machine tools. Figure 1 .

[0003] However, after the water tank 100 stops conveying coolant to the processing shaft 200, coolant may remain in the center hole of the processing shaft 200 and in the pipe conveying coolant to the processing shaft 200, causing water dripping from the processing shaft 200 in a short time.

[0004] Therefore, the prior art still has deficiencies and needs to be improved. Utility Model Content

[0005] In order to solve the above problems, the purpose of the utility model is to provide a spindle cooling system and a machining center to solve the problem of spindle dripping after stopping supplying coolant to the spindle in the prior art.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] The utility model provides a spindle cooling system, comprising:

[0008] A reservoir tank for storing coolant;

[0009] An infusion pump, wherein the inlet end of the infusion pump is connected to the outlet of the liquid storage tank, and the outlet end of the infusion pump is connected to the liquid inlet of the spindle through an oil inlet circuit, so as to transport the coolant in the liquid storage tank to the spindle;

[0010] One end of the reflux loop is connected to the liquid inlet of the spindle, and a suction structure for sucking out the coolant in the spindle is arranged on the reflux loop.

[0011] In one embodiment, the suction structure is a negative pressure pump, the inlet end of the negative pressure pump is connected to the liquid inlet of the main shaft, and the outlet end of the negative pressure pump is connected to the liquid return port of the liquid storage tank, which is used to generate negative pressure for suctioning the main shaft.

[0012] In one embodiment, the suction structure is an infusion pump, a first switching valve is further provided on the return circuit, and a second switching valve is further provided on the oil inlet circuit;

[0013] Among them, one end of the first switching valve is connected to the liquid inlet of the main shaft, and the other end is connected to the inlet end of the infusion pump; the second switching valve is respectively connected to the liquid inlet of the main shaft, the outlet end of the infusion pump and the return liquid port of the liquid storage tank, and the outlet end of the infusion pump is connected to the liquid storage tank or the main shaft through the switching of the second switching valve.

[0014] In one embodiment, the suction structure includes an ejector, a first switching valve is further provided on the return circuit, and a second switching valve is further provided on the oil inlet circuit;

[0015] Among them, one end of the first switching valve is connected to the liquid inlet of the main shaft, and the other end is connected to the liquid return port of the liquid storage tank through the ejector. The first switching valve is used to connect / close the main shaft and the liquid storage tank;

[0016] The second switching valve is connected to the liquid inlet of the main shaft, the liquid inlet of the ejector and the outlet of the infusion pump respectively, and the liquid storage tank is connected to the main shaft or the ejector through the switching of the second switching valve.

[0017] In one embodiment, the first switching valve is a two-way solenoid valve, and the second switching valve is a three-way solenoid valve, wherein the first interface of the three-way solenoid valve is connected to the liquid inlet of the main shaft, the second interface of the three-way solenoid valve is connected to the outlet end of the infusion pump, and the third interface of the three-way solenoid valve is connected to the ejector;

[0018] The first interface is opened, the third interface and the first switching valve are closed, and the outlet end of the infusion pump is connected to the main shaft; the first interface is closed, the third interface and the first switching valve are opened, and the outlet end of the infusion pump is connected to the ejector.

[0019] In one embodiment, the spindle cooling system further comprises:

[0020] The third switching valve used to connect to an external air source has one end connected to the first interface and the other end connected to the liquid inlet of the main shaft. The first switching valve is connected to the side of the third switching valve away from the second switching valve. When the third switching valve is in a ventilated state, the first interface and the first switching valve are closed.

[0021] In one embodiment, the third switching valve is a shuttle valve.

[0022] In one embodiment, the system further comprises:

[0023] The filter has one end connected to the inlet of the infusion pump and the other end connected to the outlet of the liquid storage tank, and is used to filter the coolant.

[0024] In one embodiment, the spindle cooling system further comprises:

[0025] The booster pump has one end connected to the side of the suction structure away from the main shaft, and the other end connected to the liquid return port of the liquid storage tank.

[0026] A machining center comprises: a machine tool body and any one of the above spindle cooling systems.

[0027] The beneficial effect of the utility model is that one end of the reflux circuit is connected to the liquid inlet of the spindle, and a suction structure is provided on the reflux circuit. When the liquid storage tank stops supplying coolant to the spindle, the residual coolant in the center hole of the spindle is sucked out of the spindle through the suction structure, thereby solving the problem of water dripping from the spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0029] Figure 1 It is a structural schematic diagram of the prior art;

[0030] Figure 2 It is a structural schematic diagram of an embodiment of the spindle coolant reflux system of the utility model;

[0031] Figure 3 It is a structural schematic diagram of another embodiment of the spindle coolant reflux system of the utility model;

[0032] Figure 4 It is a structural schematic diagram of another embodiment of the spindle coolant reflux system of the utility model.

[0033] The accompanying drawings are denoted as follows:

[0034] 100-water tank, 200-processing shaft;

[0035] 1-liquid storage tank, 2-infusion pump, 3-main shaft, 4-ejector, 5-first switching valve, 6-second switching valve, 7-third switching valve, 8-filter, 9-boosting pump, 10-external air source, 11 return pipe, 12-negative pressure pump. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0037] refer to Figure 2A spindle cooling system according to an embodiment of the utility model comprises: a liquid storage tank 1, an infusion pump 2 and a reflux circuit. The liquid storage tank 1 is used to store coolant and comprises a liquid outlet and a liquid return port. The inlet end of the infusion pump 2 is connected to the liquid outlet of the liquid storage tank 1. The outlet end of the infusion pump 2 is connected to the liquid inlet of the spindle 3 through an oil inlet circuit. The infusion pump 2 is used to transport the coolant in the liquid storage tank 1 to the spindle 3 to cool the spindle 3, the tool or the workpiece being processed. One end of the reflux circuit is connected to the liquid inlet of the spindle 3, and the other end is connected to the liquid return port of the liquid storage tank 1. A suction structure for sucking out the coolant in the spindle is provided on the reflux circuit.

[0038] The utility model sets a reflux loop between the pipeline of the liquid storage tank 1 and the spindle 3. When the liquid storage tank 1 stops supplying coolant to the spindle 3, the residual coolant in the center hole of the spindle 3 is sucked back into the liquid storage tank 1 by suction, thereby solving the problem of water dripping from the spindle 3.

[0039] In one embodiment, reference Figure 2 The reflux circuit includes a suction structure (not shown in the figure), one end of which is connected to the liquid inlet of the spindle 3, and the other end of which is connected to the liquid return port of the liquid storage tank 1. When the coolant is stopped from being delivered to the spindle 3, in order to prevent the spindle 3 from dripping, the suction structure is started to suck and generate negative pressure, and the residual coolant in the spindle 3 is sucked back into the liquid storage tank 1 by generating negative pressure on the spindle 3. Specifically, the suction mechanism can be set as a negative pressure pump 12.

[0040] In one embodiment, reference Figure 3 The suction structure includes a first switching valve 5 and a second switching valve 6. One end of the first switching valve 5 is connected to the liquid inlet of the main shaft 3, and the other end is connected to the inlet end of the infusion pump 2. The second switching valve 6 is connected to the liquid inlet of the main shaft, the outlet end of the infusion pump and the liquid return port of the liquid storage tank.

[0041] When cooling the spindle, the first switching valve 5 is closed and the second switching valve 6 is started, so that the liquid storage tank 1, the second switching valve 6 and the spindle 3 form a conductive liquid path, and the cooling tower in the liquid storage tank 1 is transported to the spindle 3 through the infusion pump 2. When the coolant is stopped from being transported to the spindle 3, in order to avoid the spindle 3 from dripping, the coolant remaining in the spindle 3 needs to be sucked back, so the first switching valve 5 is turned on, and the second switching valve 6 is connected to the liquid storage tank 1 and closed to the spindle 3. At this time, the coolant sucked from the liquid storage tank 1 by the infusion pump 2 will no longer flow to the spindle 3 through the second switching valve 6, but will return to the liquid storage tank 1 from the return port of the liquid storage tank 1 through the reflux pipe 11 after passing through the second switching valve 6, and in this process, the infusion pump 2 will generate a suction force on the spindle 3, so that the residual coolant in the spindle 3 is returned to the liquid storage tank 1 through the infusion pump 2 and the reflux pipe 11, thereby avoiding the phenomenon of the spindle 3 dripping. Specifically, the first switching valve 5 may be a two-way solenoid valve, and the second switching valve 6 may be a three-way solenoid valve.

[0042] In addition to the above-mentioned method of directly generating negative pressure on the main shaft 3, the suction structure can also be set as a switching valve to generate negative pressure by the flow of coolant.

[0043] In one embodiment, reference Figure 4 The suction structure includes a first switching valve 5, a second switching valve 6 and an ejector 4. One end of the first switching valve 5 is connected to the liquid inlet of the main shaft 3, and the other end of the first switching valve 5 is connected to the liquid return port of the liquid storage tank 1 through the ejector 4. The second switching valve 6 is respectively connected to the liquid inlet of the main shaft 3, the liquid inlet of the ejector 4 and the liquid outlet of the liquid storage tank 1; specifically, one end of the second switching valve 6 is connected to the main shaft 3, and the other end of the second switching valve 6 is connected to the liquid outlet of the liquid storage tank 1. In addition, the second switching valve 6 is also connected to the liquid inlet of the ejector 4 through a pipeline, and one end of the ejector 4 away from the first switching valve 5 and the second switching valve 6 is connected to the liquid return port of the liquid storage tank 1. By switching the second switching valve 6, the liquid storage tank 1 is connected to the main shaft 3, or the liquid storage tank 1 is connected to the ejector 4, that is, the liquid storage tank 1 can be selected to be connected to the main shaft 3 or the ejector 4 by switching.

[0044] When the liquid storage tank 1 is connected to the spindle 3, the coolant is delivered to the spindle 3 through the infusion pump 2 for cooling. When the liquid storage tank 1 is connected to the ejector 4, since the other end of the ejector 4 is connected to the liquid return port of the liquid storage tank 1, the liquid outlet of the liquid storage tank 1, the second switching valve 6, the ejector 4 and the liquid return port of the liquid storage tank 1 form a loop, and the coolant flows out of the liquid storage tank 1, passes through the ejector 4 and then returns to the liquid storage tank 1. In this process, negative pressure is generated when the coolant passes through the ejector 4, so that a pressure difference is generated between the spindle 3 and the ejector 4. However, after the first switching valve 5 is opened, the residual coolant in the spindle 3 will flow to the ejector 4 side, and finally flow back to the liquid storage tank 1 through the ejector 4.

[0045] In one embodiment, reference Figure 4 The first switching valve 5 is a two-way solenoid valve, and the second switching valve 6 is a three-way solenoid valve; wherein the three-way solenoid valve includes a first interface, a second interface and a third interface, the first interface is connected to the main shaft 3, the second interface is connected to the liquid outlet of the liquid storage tank 1, and the third interface is connected to the ejector 4 through a pipeline.

[0046] The liquid reservoir 1 is connected to the spindle 3 and the ejector 4 respectively by switching the first interface and the third interface. Specifically, the first interface is opened and the third interface is closed, and the two-way solenoid valve is closed. At this time, the liquid reservoir 1 is connected to the spindle 3 through the three-way solenoid valve, and the coolant is delivered to the spindle 3 through the infusion pump 2. When the cooling of the spindle 3 is stopped, in order to avoid water dripping from the spindle 3, the first interface is closed, the third interface is opened, and the two-way solenoid valve is opened. At this time, the liquid reservoir 1 is connected to the ejector 4 to realize the reflux path of the liquid reservoir 1. The coolant delivered by the infusion pump 2 will flow back to the liquid reservoir 1 through the ejector 4. In this process, the negative pressure generated when the coolant passes through the ejector 4 will suck back the residual liquid in the spindle 3, so that the residual liquid in the spindle 3 flows back to the liquid reservoir 1 through the two-way solenoid valve and the ejector 4.

[0047] In one embodiment, reference Figure 4 The system further includes a third switching valve 7, one end of which is connected to the spindle 3, and the other end is connected to the first interface of the second switching valve 6. The third switching valve 7 is connected to the external air source 10 for supplying air to the spindle 3. The third switching valve 7 is a one-way valve. When the external air source supplies air to the third switching valve 7, the spindle 3 changes the tool by air pressure. At the same time, since the third switching valve 7 is a one-way valve, the air flow will not flow to the side of the second switching valve 6. When the spindle 3 completes the tool change, the external air source 10 stops supplying air. At this time, the third switching valve 7 and the first interface are connected, and the infusion pump 2 can deliver the coolant in the liquid storage tank 1 to the spindle 3 again.

[0048] In one embodiment, reference Figure 4 The third switching valve 7 is a shuttle valve. When the liquid circuit is connected (the liquid storage tank 1 is connected to the spindle 3), since the shuttle valve is one-way, the coolant will not flow into the gas circuit; when the gas circuit is connected (the external gas source 10 is connected to the shuttle valve), the external gas source 10 supplies gas to the spindle 3 through the shuttle valve, and the gas flow will not flow to the side of the shuttle valve close to the second switching valve 6. The time for the machine tool to change tools through air pressure is very short. When the external gas source 10 supplies gas to the shuttle valve, the end of the shuttle valve close to the second switching valve 6 is in a blocked state.

[0049] In one embodiment, reference Figure 4 The system of the present application further comprises a filter component, one end of which is connected to the main shaft 3 and the other end of which is connected to the liquid storage tank 1 for filtering the coolant.

[0050] Furthermore, the filter component includes a filter 8, one end of the filter 8 is connected to the infusion pump 2, and the other end is connected to the liquid outlet of the liquid storage tank 1. In order to make the coolant delivered to the spindle 3 pure, the filter 8 is set to filter the coolant when the coolant is input to the spindle 3.

[0051] In one embodiment, reference Figure 4The spindle cooling system also includes a booster pump 9, one end of which is connected to the side of the suction structure away from the spindle 3, and the other end is connected to the liquid return port of the liquid storage tank 1. The booster pump 9 can increase the negative pressure generated by the suction structure, for example, increase the negative pressure at the ejector 4, so that the coolant remaining in the spindle 3 is sucked more strongly.

[0052] The present invention also provides a machining center, including a machine tool body and any one of the above spindle cooling systems. During machining, the spindle cooling system of the present invention recovers the residual liquid in the spindle 3 into the liquid storage tank 1 to avoid water dripping from the spindle 3.

[0053] The above are only preferred implementations of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A spindle cooling system, characterized in that: include: A liquid storage tank (1), used for storing coolant; an infusion pump (2), wherein the inlet end of the infusion pump (2) is connected to the outlet of the liquid storage tank (1), and the outlet end of the infusion pump (2) is connected to the liquid inlet of the spindle via an oil inlet circuit, and is used to transport the coolant in the liquid storage tank (1) to the spindle (3); A reflux loop has one end connected to the liquid inlet of the spindle (3), and a suction structure for sucking out the coolant in the spindle is provided on the reflux loop.

2. The spindle cooling system according to claim 1, characterized in that: The suction structure is a negative pressure pump (12), the inlet end of the negative pressure pump (12) is connected to the liquid inlet of the main shaft (3), and the outlet end of the negative pressure pump (12) is connected to the liquid return port of the liquid storage tank (1), so as to generate negative pressure by sucking the main shaft (3).

3. The spindle cooling system according to claim 1, characterized in that: The suction structure is the infusion pump (2), the return circuit is further provided with a first switching valve (5), and the oil inlet circuit is further provided with a second switching valve (6); One end of the first switching valve (5) is connected to the liquid inlet of the main shaft (3), and the other end is connected to the inlet end of the infusion pump (2); the second switching valve (6) is respectively connected to the liquid inlet of the main shaft (3), the outlet end of the infusion pump (2) and the liquid return port of the liquid storage tank (1), and the outlet end of the infusion pump (2) is connected to the liquid storage tank (1) or the main shaft (3) by switching the second switching valve (6).

4. The spindle cooling system according to claim 1, characterized in that: The suction structure comprises an ejector (4), a first switching valve (5) is further provided on the return circuit, and a second switching valve (6) is further provided on the oil inlet circuit; One end of the first switching valve (5) is connected to the liquid inlet of the main shaft (3), and the other end is connected to the liquid return port of the liquid storage tank (1) through the ejector (4). The first switching valve (5) is used to connect / close the main shaft (3) and the liquid storage tank (1); The second switching valve (6) is respectively connected to the liquid inlet of the main shaft (3), the liquid inlet of the ejector (4) and the outlet of the infusion pump (2), and the liquid storage tank (1) and the main shaft (3) or the ejector (4) are connected by switching of the second switching valve (6).

5. The spindle cooling system according to claim 4, characterized in that: The first switching valve (5) is a two-way solenoid valve, and the second switching valve (6) is a three-way solenoid valve, wherein a first interface of the three-way solenoid valve is connected to the liquid inlet of the main shaft (3), a second interface of the three-way solenoid valve is connected to the outlet end of the infusion pump (2), and a third interface of the three-way solenoid valve is connected to the ejector (4); The first interface is opened, the third interface and the first switching valve (5) are closed, and the outlet end of the infusion pump (2) is connected to the main shaft (3); the first interface is closed, the third interface and the first switching valve (5) are opened, and the outlet end of the infusion pump (2) is connected to the ejector (4).

6. The spindle cooling system according to claim 5, characterized in that: The spindle cooling system also includes: A third switching valve (7) for connecting to an external air source (10) has one end connected to the first interface and the other end connected to the liquid inlet of the spindle (3). The first switching valve (5) is connected to a side of the third switching valve (7) away from the second switching valve (6). When the third switching valve (7) is in a ventilated state, the first interface and the first switching valve (5) are closed.

7. The spindle cooling system according to claim 6, characterized in that: The third switching valve (7) is a shuttle valve.

8. The spindle cooling system according to claim 6, characterized in that: The system further comprises: A filter (8) is connected at one end to the inlet of the infusion pump (2) and at the other end to the outlet of the liquid storage tank (1) for filtering the coolant.

9. The spindle cooling system according to any one of claims 4 to 7, characterized in that: The spindle cooling system also includes: A booster pump (9) has one end connected to a side of the suction structure away from the main shaft (3), and another end connected to a liquid return port of the liquid storage tank (1).

10. A machining center, characterized in that: include: A machine tool body and a spindle cooling system as claimed in any one of claims 1 to 9.

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