A drill press spindle control system and method of controlling the same

Abstract

The present application belongs to the technical field of drilling machine main shaft, and particularly relates to a drilling machine main shaft control system and a control method thereof. The control system comprises: a drilling machine main shaft; an external cooling circulation assembly for providing cooling liquid when the drilling machine main shaft is running; a main shaft temperature detection assembly arranged on the main shaft shell for detecting the heating condition of the main shaft shell; a control cabinet with a control circuit formed by a controller, a frequency converter, a contactor and the like; and the drilling machine main shaft comprises: a main shaft shell comprising a cylinder body and shell flanges formed at both ends of the cylinder body; a stator component arranged in the main shaft shell; a rotor component arranged inside the stator component; a main shaft body arranged inside the rotor component and extending out of the main shaft shell at both ends; and an external cooling ring arranged outside the main shaft shell, wherein a chip liquid passage coaxially arranged is formed in the middle of the main shaft body.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of main shaft of drilling machine, and particularly relates to a main shaft control system of drilling machine and a control method thereof. BACKGROUND

[0002] Drilling machine refers to a machine tool mainly used for drilling holes on workpieces. Generally, the rotation of the drill bit is the main movement, and the axial movement of the drill bit is the feeding movement. The drilling machine has simple structure and relatively low machining precision, and can drill through holes, blind holes, expand holes, counterbore holes, ream holes, or perform tapping and other processes. However, the main shaft of the traditional drilling machine is mostly driven by a belt or a gear, thereby affecting the transmission efficiency. SUMMARY

[0003] The present application aims to provide a main shaft control system of drilling machine with high transmission efficiency and good heat dissipation performance, and a control method thereof, in view of the above-mentioned technical problems.

[0004] Therefore, the present application provides a main shaft control system of drilling machine, which comprises:

[0005] a main shaft of drilling machine;

[0006] an external cooling circulation assembly for providing cooling liquid when the main shaft of drilling machine is running;

[0007] a main shaft temperature detection assembly arranged on the main shaft shell and used for detecting the heating condition of the main shaft shell;

[0008] a control cabinet with a control circuit formed by a controller, a frequency converter, a contactor, etc. inside;

[0009] The main shaft of drilling machine comprises:

[0010] a main shaft shell comprising a cylinder body and shell flanges formed at both ends of the cylinder body;

[0011] a stator component arranged inside the main shaft shell;

[0012] a rotor component arranged inside the stator component;

[0013] a main shaft body arranged inside the rotor component and extending out of the main shaft shell at both ends;

[0014] an external cooling ring arranged outside the main shaft shell;

[0015] wherein a chip liquid passage is formed in the middle of the main shaft body and arranged coaxially.

[0016] In the above technical solution, further, the external cooling ring comprises:

[0017] an outer ring body sleeved outside the cylinder body of the main shaft shell and forming a cooling cavity between the main shaft shell; and both ends of the outer ring body abut against the two shell flanges, respectively.

[0018] cooling water inlet formed on the shell flange at one end;

[0019] cooling water outlet formed on the shell flange at the other end;

[0020] wherein the cooling water inlet and the cooling water outlet are respectively communicated with the cooling cavity, and the outer wall of the main shaft shell is formed with a plurality of cooling grooves uniformly distributed in the circumference.

[0021] In the above technical solution, further, the outer cooling ring further comprises:

[0022] a plurality of cooling contact blocks uniformly distributed in the circumference on the main shaft shell, and formed with protrusions for plugging the cooling grooves;

[0023] a plurality of buffer supporting members respectively arranged between the cooling contact blocks and the outer ring body;

[0024] a lower floating block arranged on the lower end shell flange where the cooling water inlet is located, for plugging the cooling water inlet and formed with an annular groove communicated with the cooling water inlet, and formed with a communication hole communicated with the cooling cavity;

[0025] a plurality of buffer reset members for fixing the lower floating block on the end surface of the shell flange in the circumference;

[0026] wherein the lower floating block is formed with an extrusion guide portion, the lower side of the cooling contact block is formed with a contact portion matched with the extrusion guide portion, and the displacement of the lower floating block drives the protrusions on the cooling contact block to disengage from the cooling grooves and displace to the direction of the outer ring body.

[0027] In the above technical solution, further, the outer cooling ring further comprises:

[0028] a water supply tank for storing cooling water;

[0029] a cooling pumping assembly for pumping the cooling water into the cooling cavity;

[0030] a cooling and cooling assembly for cooling the cooling liquid delivered to the cooling cavity;

[0031] a water tank temperature sensor for detecting the temperature of the cooling water in the water supply tank;

[0032] a plurality of inlet water temperature sensors for detecting the temperature of the cooling water to be input into the cooling cavity;

[0033] a plurality of inlet water pressure sensors for detecting the water pressure of the cooling water to be input into the cooling cavity;

[0034] a flow control valve for controlling the flow of the cooling water input into the cooling cavity;

[0035] The cooling delivery loop connects a water supply tank, a cooling pumping assembly, a cooling temperature reducing assembly and a cooling cavity to form a closed cooling loop.

[0036] In the above technical solution, further, the cooling pumping assembly comprises:

[0037] a main delivery pump for delivering cooling water;

[0038] an auxiliary delivery pump for delivering cooling water in cooperation with the main delivery pump;

[0039] the cooling temperature reducing assembly comprises:

[0040] a main cooler for cooling and reducing the temperature of the cooling water;

[0041] a secondary cooler for cooling and reducing the temperature of the cooling water in cooperation with the main cooler;

[0042] a vice cooler for cooling and reducing the temperature of the cooling water in cooperation with the main cooler and the secondary cooler;

[0043] The cooling delivery loop can control the cooling water to pass through the main delivery pump and / or the auxiliary delivery pump in the cooling pumping assembly, and control the cooling water to pass through the main cooler and / or the secondary cooler and / or the vice cooler in the cooling temperature reducing assembly.

[0044] In the above technical solution, further, the cooling delivery loop comprises:

[0045] a cooling return water pipeline connecting an outlet end of the cooling cavity and an inlet end of the water supply tank;

[0046] a pumping pipeline comprising a main pumping pipeline and an auxiliary pumping pipeline connected in parallel, one end of the main pumping pipeline and the auxiliary pumping pipeline connected in parallel being connected to an outlet end of the water supply tank, the main delivery pump being arranged on the main pumping pipeline and the auxiliary delivery pump being arranged on the auxiliary pumping pipeline;

[0047] a cooling delivery pipeline comprising a main cooling pipeline, a secondary cooling pipeline and a vice cooling pipeline connected in parallel, one end of the main cooling pipeline, the secondary cooling pipeline and the vice cooling pipeline connected in parallel being connected to the other end of the pumping pipeline, and the other end being connected to an inlet end of the cooling cavity; the main cooler being arranged on the main cooling pipeline, the secondary cooler being arranged on the secondary cooling pipeline, and the vice cooler being arranged on the vice cooling pipeline;

[0048] The auxiliary pumping pipeline is provided with an auxiliary pump control valve on the side of the inlet end of the auxiliary delivery pump; the main cooling pipeline is provided with a main cooling control valve on the side of the inlet end of the main cooler, the secondary cooling pipeline is provided with a secondary cooling control valve on the side of the inlet end of the secondary cooler, and the vice cooling pipeline is provided with a vice cooling control valve on the side of the inlet end of the vice cooler; and the cooling return water pipeline passes through a cooling tower in the middle.

[0049] In the above technical solution, further,

[0050] the pumping pipeline further comprises:

[0051] Pumping switching pipeline, one end is connected with the main pumping pipeline and the other end is connected with the auxiliary pumping pipeline;

[0052] The cooling delivery pipeline further comprises:

[0053] The main cooling switching pipeline, one end is connected with the main cooling pipeline between the main cooling control valve and the main cooler and the other end is connected with the main cooling pipeline between the main cooler and the auxiliary cooler;

[0054] The auxiliary cooling switching pipeline, one end is connected with the auxiliary cooling pipeline between the auxiliary cooling control valve and the auxiliary cooler and the other end is connected with the auxiliary cooling pipeline between the auxiliary cooler and the auxiliary cooler;

[0055] And the main cooling control valve is arranged on the side of the main cooling pipeline connected with the main cooler. The main pump switching valve, the auxiliary pump switching valve, the main cooling switching valve, the main cooling switching valve, the auxiliary cooling switching valve and the auxiliary cooling switching valve are all three-way electric control valves. The main cooling control valve, the main cooling control valve, the main cooling control valve and the auxiliary pump control valve are all two-way electric control valves.

[0056] The beneficial effects of the present application are:

[0057] 1. The main shaft of the drilling machine is built into the motor, and the main shaft is directly driven by the motor, which can improve the transmission efficiency, make the structure of the main shaft of the drilling machine more compact, and save the use of transmission components such as reducers, thereby reducing production costs.

[0058] 2. The outer main shaft shell is provided with a cooling ring, and the outer cooling circulating assembly is used to deliver cooling water into the cooling ring, so as to cool the temperature of the main shaft, thereby ensuring the service life and performance of the main shaft of the drilling machine.

[0059] 3. The outer cooling circulating assembly can ensure the stability and temperature of the cooling water delivered into the outer cooling ring, thereby ensuring the performance of the main shaft of the drilling machine. The main shaft temperature detection assembly can be used to monitor the heating condition of the main shaft, and can facilitate the cooling of the main shaft. BRIEF DESCRIPTION OF DRAWINGS

[0060] Figure 1 is a structural schematic view of the main shaft of the drilling machine in the present application;

[0061] Figure 2 is a longitudinal sectional view of the main shaft of the drilling machine in the present application;

[0062] Figure 3 is a transverse sectional view of the main shaft of the drilling machine in the present application;

[0063] Figure 4 is a structural schematic diagram of the system of the present application;

[0064] Figure 5 The control principle diagram of the control method of the present application; the marks in the figure are: 1-main shaft shell, 2-main shaft body, 3-chip liquid channel, 4-outer ring body, 5-cooling cavity, 6-cooling water inlet, 7-cooling water outlet, 8-cooling contact block, 9-bump, 10-buffer support, 11-lower floating block, 12-communication hole, 13-buffer reset part, 14-extrusion guide part, 15-contact part, 100-water supply tank, 101-tank temperature sensor, 102-water inlet temperature sensor, 103-water inlet water pressure sensor, 104-main conveying pump, 105-assistant conveying pump, 106-main cooler, 107-secondary cooler, 108-vice cooler, 109-cooling return water pipeline, 110-main pumping pipeline, 111-assistant pumping pipeline, 112-main cooling pipeline, 113-secondary cooling pipeline, 114-vice cooling pipeline, 115-assistant pump control valve, 116-main cooling control valve, 117-secondary cooling control valve, 118-vice cooling control valve, 119-pumping switching pipeline, 120-main pump switching valve, 121-secondary pump switching valve, 122-main cooling switching pipeline, 123-main cooling switching valve, 124-main cooling switching valve, 125-secondary cooling switching pipeline, 126-secondary cooling switching valve, 127-secondary cooling switching valve, 128-main cooling control valve, 129-flow control valve. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0066] Embodiment 1:

[0067] The present embodiment provides a drilling machine main shaft control system, comprising:

[0068] The drilling machine main shaft;

[0069] The outer cooling circulating assembly provides cooling liquid for the operation of the drilling machine main shaft;

[0070] The main shaft temperature detection assembly is arranged on the main shaft shell 1 and is used for detecting the heating condition of the main shaft shell 1;

[0071] The control cabinet has a control circuit formed by a controller, a frequency converter, a contactor and the like;

[0072] The drilling machine main shaft comprises:

[0073] The main shaft shell 1 comprises a cylinder and shell flanges formed at both ends of the cylinder;

[0074] The stator component is arranged inside the main shaft shell 1;

[0075] The rotor component is arranged inside the stator component;

[0076] The main shaft body 2 is arranged inside the rotor component and extends out of the main shaft shell 1 at both ends;

[0077] The outer cooling ring is arranged outside the main shaft shell 1;

[0078] The main shaft body 2 is arranged inside the rotor component and extends out of the main shaft shell 1 at both ends;

[0079] In the technical solution, the main shaft of the drilling machine is arranged in the motor, the main shaft is directly driven by the motor, the transmission efficiency is improved, the structure of the main shaft of the drilling machine is more compact, the use of the transmission components such as the speed reducer is avoided, and the production cost is reduced. The cooling ring is arranged outside the main shaft shell 1, the cooling water is supplied to the cooling ring through the outer cooling circulating assembly, the temperature of the main shaft is cooled, and the service life and performance of the main shaft of the drilling machine are ensured. The outer cooling circulating assembly can ensure the stability and temperature of the cooling water supplied to the outer cooling ring, and the performance of the main shaft of the drilling machine is ensured. The main shaft temperature detection assembly can be used for monitoring the heating condition of the main shaft, and the main shaft is cooled. The cutting fluid channel 3 can facilitate the input of the cooling liquid during drilling, thereby improving the drilling effect.

[0080] Embodiment 2:

[0081] The drilling machine main shaft control system provided in the embodiment comprises the following technical features in addition to the technical solutions in the above embodiments.

[0082] The outer cooling ring comprises:

[0083] The outer ring body 4 is sleeved outside the cylinder of the main shaft shell 1, and a cooling cavity 5 is formed between the main shaft shell 1 and the outer ring body 4; and the two ends of the outer ring body 4 abut against the two shell flanges, respectively;

[0084] The cooling water inlet 6 is formed on the shell flange at one end;

[0085] The cooling water outlet 7 is formed on the shell flange at the other end;

[0086] The cooling water inlet 6 and the cooling water outlet 7 are in communication with the cooling cavity 5, respectively, and a plurality of cooling grooves are formed on the outer wall of the main shaft shell 1 and are uniformly distributed in a circle.

[0087] In the technical solution, the outer ring body 4 forms the outer wall of the cooling cavity 5, the main shaft shell 1 becomes the inner wall of the cooling cavity 5, and the two shell flanges form the ends of the cooling cavity 5 at both ends. The cooling cavity 5 formed outside the main shaft shell 1 can achieve good cooling and heat dissipation effect on the main shaft. The cooling water inlet 6 is arranged on the shell flange at the lower end, and the cooling water outlet 7 is arranged on the shell flange at the upper end, so that the cooling water injected into the cooling cavity 5 slowly fills the cooling cavity 5 from the lower part of the cooling cavity 5 and then is discharged from the cooling water outlet 7, thereby ensuring that the cooling liquid can better cool the main shaft. The cooling groove arranged can increase the contact area of the outer surface of the main shaft shell 1 to improve the cooling and heat dissipation performance.

[0088] Embodiment 3:

[0089] The embodiment provides a drill press main shaft control system, in addition to the technical solutions of the above embodiments, further having the following technical features.

[0090] The outer cooling ring further comprises:

[0091] A plurality of cooling contact blocks 8 are uniformly distributed in the circumferential direction of the main shaft shell 1, and a convex block 9 for plugging the cooling groove is formed on each cooling contact block 8.

[0092] A plurality of buffer supporting members 10 are arranged between the cooling contact blocks 8 and the outer ring body 4.

[0093] A lower floating block 11 is arranged on the shell flange at the lower end where the cooling water inlet 6 is located, and is used for plugging the cooling water inlet 6 and forming an annular groove in communication with the cooling water inlet 6. A communication hole 12 in communication with the cooling cavity 5 is formed on the lower floating block 11.

[0094] A plurality of buffer reset members 13 are arranged to fix the lower floating block 11 on the end surface of the shell flange in the circumferential direction.

[0095] The lower floating block 11 is provided with an extrusion guide portion 14, and the lower side of the cooling contact block 8 is provided with a contact portion 15 matched with the extrusion guide portion 14. The displacement of the lower floating block 11 drives the convex block 9 on the cooling contact block 8 to disengage from the cooling groove and displace towards the outer ring body 4.

[0096] The cooling contact block 8 is arranged to fill the cooling cavity 5, reduce the volume of the cooling cavity 5, and improve the circulation efficiency of the cooling liquid in the cooling liquid flow channel. The protrusions 9 formed on the cooling contact block 8 change the surface area of the main shaft housing 1 in contact with the cooling cavity 5 during the movement of the cooling contact block 8, ensure that the main shaft can be stably maintained within a certain temperature range according to the heat generation of the main shaft, and further improve the service life of the main shaft as a whole. The buffer support 10 is arranged to elastically abut against the main shaft housing 1, and the buffer support 10 can be an elastic telescopic rod in an extended state in a normal state. The lower floating block 11 blocks the cooling water inlet 6 and is provided with a buffer groove in communication with the cooling water inlet 6 and a communication hole 12 penetrating the annular groove. When the water pressure of the cooling water entering the cooling water inlet 6 is low, the water enters the annular groove and then enters the cooling cavity 5 through the communication hole. When the water pressure is high, the lower floating block 11 is driven to move upward, the contact part 15 is pressed to make the cooling contact block 8 drive the protrusions 9 to separate from the cooling groove, the surface area of the main shaft housing 1 in contact with the cooling cavity 5 is increased, the cooling and heat dissipation effect is improved, and the temperature stability of the main shaft housing 1 is ensured. The buffer reset member 13 can be a bolt and a reset spring, and the lower floating block 11 is connected to the housing flange through the bolt and can slide up and down. The reset spring ensures that the lower floating block 11 can be quickly reset when the water pressure is low.

[0097] Embodiment 4:

[0098] The drilling machine main shaft control system provided in the embodiment further has the following technical features in addition to the technical solutions in the above embodiments.

[0099] The external cooling circulation assembly comprises:

[0100] The water supply tank 100 is used to store cooling water.

[0101] The cooling pumping assembly is used to pump the cooling water into the cooling cavity 5.

[0102] The cooling and temperature reducing assembly is used to reduce the temperature of the cooling liquid delivered to the cooling cavity 5.

[0103] The water tank temperature sensor 101 is used to detect the temperature of the cooling water in the water supply tank 100.

[0104] The water inlet temperature sensors 102 are used to detect the temperature of the cooling water to be input into the cooling cavity 5.

[0105] The water inlet water pressure sensors 103 are used to detect the water pressure of the cooling water to be input into the cooling cavity 5.

[0106] a flow control valve 129 for controlling the flow of cooling water into the cooling cavity 5;

[0107] a cooling delivery circuit connecting the water supply tank, the cooling pumping assembly, the cooling temperature reducing assembly and the cooling cavity 5 to form a closed cooling circuit.

[0108] In the technical solution, the capacity of the water supply tank 100 is 2-5 cubic meters, and if the cooling water is supplied to multiple spindles at the same time, the capacity can be 10-15 cubic meters. The cooling pumping assembly can change the efficiency and effect of pumping cooling water by changing the delivery power. The cooling temperature reducing assembly can adjust the temperature of the cooling water flowing out by changing the path of the cooling water flowing out of the cooling temperature reducing assembly, so as to adjust the temperature of the cooling water to cool and reduce the temperature of the spindle when the temperature of the spindle changes too much, so that the spindle can be kept within a certain temperature range. The water tank temperature sensor 101 detects the real-time water temperature in the water supply tank 100, and feeds back the real-time water temperature to the controller, so that the controller can better control the operating state of the cooling pumping assembly and the cooling temperature reducing assembly, and ensure that the temperature of the output cooling water can keep the spindle within a certain temperature range, and better ensure the overall use performance and service life of the spindle. The inlet water temperature sensor 102 is used to monitor the temperature of the cooling water passing through the cooling temperature reducing assembly, so that the controller can determine whether the temperature of the cooling water passing through the cooling temperature reducing assembly meets the requirements, and if not, the controller can adjust in time. The inlet water pressure sensor 103 is used to monitor the water pressure of the cooling water to be entered into the cooling cavity 5, so as to better adjust when the water pressure does not meet the requirements. The flow control valve 129 is used to control the flow of cooling water into the cooling cavity 5, so that the flow of cooling water into the cooling cavity 5 can be adjusted in time when the temperature of the cooling water is higher or lower than the requirements. The cooling delivery circuit connects each component in the external cooling circulating assembly to form a connected pipeline. If the control system supplies cooling water to multiple spindle cooling cavities 5, an inlet water temperature sensor 102 and an inlet water pressure sensor 103 are arranged on the inlet end of each cooling cavity 5.

[0109] Embodiment 5:

[0110] The embodiment provides a drilling machine spindle control system, which comprises the technical solutions of the above-mentioned embodiments and has the following technical features.

[0111] The cooling pumping assembly comprises:

[0112] a main delivery pump 104 for delivering cooling water;

[0113] an auxiliary delivery pump 105 for delivering cooling water in cooperation with the main delivery pump 104;

[0114] the cooling temperature reducing assembly comprises:

[0115] The main cooler 106 is used to cool the cooling water;

[0116] The secondary cooler 107 is used to cooperate with the main cooler 106 to cool the cooling water;

[0117] The auxiliary cooler 108 is used to cooperate with the main cooler 106 and the secondary cooler 107 to cool the cooling water;

[0118] The cooling delivery circuit can control the cooling water to pass through the main delivery pump 104 and / or the auxiliary delivery pump 105 in the cooling pump assembly, and control the cooling water to pass through the main cooler 106 and / or the secondary cooler 107 and / or the auxiliary cooler 108 in the cooling cooling assembly.

[0119] In the technical solution, the main delivery pump 104 mainly pumps the cooling water for one to three main shafts, and the output power of the main delivery pump 104 can be changed to adjust the water pressure and flow rate of the cooling water. The auxiliary delivery pump 105 can cooperate with the main delivery pump 104 to pump the cooling water. If the cooling water is provided for three or more main shafts, the main delivery pump 104 and the auxiliary delivery pump 105 can be connected in parallel to increase the pump flow of the cooling pump assembly. If the main delivery pump 104 is at the maximum output power and the water pressure is insufficient when the cooling water passes through the main shafts, the main delivery pump 104 and the auxiliary delivery pump 105 can be connected in series to ensure the pressure of the cooling water output by the cooling pump assembly.

[0120] The main cooler 106, the secondary cooler 107 and the auxiliary cooler 108 can be plate type, shell and tube type, spiral plate type or evaporative type.

[0121] The main cooler 106 is used to provide cooling water with further cooling for one to three main shafts. The secondary cooler 107 can be connected in series with the main cooler 106 to further reduce the temperature of the cooling water. If the secondary cooler 107 is connected in parallel with the main cooler 106, the secondary cooler 107 can cool the cooling water when the cooling water is delivered at a large flow rate. The auxiliary cooler 108 can be connected in series with the main cooler 106 and the secondary cooler 107 to further reduce the temperature of the cooling water output. For example, when multiple main shafts are running at the same time and the temperature is high. The auxiliary cooler 108 can be connected in parallel with the main cooler 106 and the secondary cooler 107 to ensure that the cooling water is provided for multiple main shafts, and the flow rate and the temperature of the cooling water are ensured.

[0122] The output condition of the cooling pumping assembly and the cooling temperature reducing assembly is adjusted, so that the single or multiple main shafts can be cooled, the temperature of the cooling water delivered to the main shafts can be ensured when the water temperature in the water supply tank 100 is high, the single or multiple main shafts can be cooled at the same time when the temperature of the single or multiple main shafts is too high, and the water pressure and flow rate for cooling the single or multiple main shafts can be ensured, so that the use performance and service life of the main shafts are ensured.

[0123] Embodiment 6:

[0124] The drilling machine main shaft control system provided in the embodiment further has the following technical features in addition to the technical solutions in the above embodiments.

[0125] The cooling delivery circuit comprises:

[0126] The cooling return water pipeline 109 is connected between the outlet end of the cooling cavity 5 and the inlet end of the water supply tank 100.

[0127] The pumping pipeline comprises a main pumping pipeline 110 and an auxiliary pumping pipeline 111 connected in parallel, one end of the pipelines connected in parallel is connected to the outlet end of the water supply tank 100, the main pumping pipeline 110 is provided with the main delivery pump 104, and the auxiliary pumping pipeline 111 is provided with the auxiliary delivery pump 105.

[0128] The cooling delivery pipeline comprises a main cooling pipeline 112, a secondary cooling pipeline 113 and a vice cooling pipeline 114 connected in parallel, one end of the pipelines connected in parallel is connected to the other end of the pumping pipeline, and the other end is connected to the inlet end of the cooling cavity 5; the main cooling pipeline 112 is provided with the main cooler 106, the secondary cooling pipeline 113 is provided with the secondary cooler 107, and the vice cooling pipeline 114 is provided with the vice cooler 108.

[0129] The auxiliary pumping pipeline 111 is provided with an auxiliary pump control valve 115 on the side of the inlet end of the auxiliary delivery pump 105; the main cooling pipeline 112 is provided with a main cooling control valve 116 on the side of the inlet end of the main cooler 106, the secondary cooling pipeline 113 is provided with a secondary cooling control valve 117 on the side of the inlet end of the secondary cooler 107, and the vice cooling pipeline 114 is provided with a vice cooling control valve 118 on the side of the inlet end of the vice cooler 108; and the cooling return water pipeline 109 is provided with a cooling tower in the middle part.

[0130] In the technical solution, the cooling return water pipeline 109 is used to deliver the cooling water with a raised temperature discharged from the cooling cavity 5 back to the water supply tank 100, and the cooling return water pipeline 109 is provided with a cooling tower in the middle part, so that the cooling water entering the water supply tank 100 can be pre-cooled, and the water temperature in the water supply tank 100 is ensured.

[0131] The pump delivery pipeline is used to deliver water from the water supply tank 100 to the inlet of the main delivery pump 104 and / or the auxiliary delivery pump 105, and can ensure that the pumped cooling water enters the cooling assembly better.

[0132] The cooling delivery pipeline regularly passes the cooling water output from the cooling pump assembly through the main cooler 106 and / or the secondary cooler 107 and / or the auxiliary cooler 108, so as to ensure the temperature of the cooling water passing through the cooling assembly. When the auxiliary pump control valve is opened, the cooling water enters the auxiliary delivery pump 105; when the main cooling valve is opened, the cooling water enters the main cooler 106; when the secondary cooling valve is opened, the cooling water enters the secondary cooler 107; and when the auxiliary cooling pump is opened, the cooling water enters the auxiliary cooling pump. The opening and closing of the valves are controlled by the controller, so as to change the flow path of the cooling water in the cooling delivery pipeline.

[0133] Embodiment 7:

[0134] The embodiment provides a drill spindle control system, in addition to the technical solutions of the above-mentioned embodiments, further has the following technical features.

[0135] The pump delivery pipeline further comprises:

[0136] The pump switching pipeline 119 is connected to one side of the inlet end of the main delivery pump 104 and is provided with a main pump switching valve 120 at the end, and the other end is connected to one side of the outlet end of the auxiliary delivery pump 105 and is provided with a secondary pump switching valve 121 at the end;

[0137] The cooling delivery pipeline further comprises:

[0138] The main cooling switching pipeline 122 is connected to the part of the main cooling pipeline 112 between the main cooling control valve 116 and the main cooler 106 and is provided with a main cooling switching valve 123 at the end, and the other end is connected to the part of the secondary cooling pipeline 113 between the outlet end of the secondary cooler 107 and is provided with a main cooling switching valve 124 at the end;

[0139] The secondary cooling switching pipeline 125 is connected to the part of the secondary cooling pipeline 113 between the secondary cooling control valve 117 and the secondary cooler 107 and is provided with a secondary cooling switching valve 126 at the end, and the other end is connected to the part of the auxiliary cooling pipeline 114 between the outlet end of the auxiliary cooler 108 and is provided with a secondary cooling switching valve 127 at the end;

[0140] And the main cooling control valve 128 is arranged on the side of the main cooling pipeline 112 connected with the outlet end of the main cooler 106. The main pump switching valve 120, the secondary pump switching valve 121, the main cooling switching valve 123, the main cooling switching valve 124, the secondary cooling switching valve 126 and the secondary cooling switching valve 127 are all three-way electric control valves. The main cooling control valve 116, the main cooling control valve 128, the main cooling control valve 116 and the auxiliary pump control valve 115 are all two-way electric control valves.

[0141] In the technical solution, the main pump switching valve 120, the secondary pump switching valve 121 and the auxiliary pump control valve 115 in the pump switching pipeline 119 cooperate to realize the pumping of the cooling water by the main conveying pump 104 alone, or in parallel or in series with the auxiliary conveying pump 105. The main pump switching valve 120 can connect the inlet end of the main conveying pump 104 with the main pumping pipeline 110 or the pump switching pipeline 119, and the secondary pump switching valve 121 can connect the outlet end of the auxiliary conveying pump 105 with the auxiliary pumping pipeline 111 or the pump switching pipeline 119.

[0142] When the main conveying pump 104 pumps the cooling water alone, the auxiliary pump control valve 115 is closed, the main pump switching valve 120 connects the inlet end of the main conveying pump 104 with the main pumping pipeline 110, and the secondary pump switching valve 121 connects the outlet end of the auxiliary conveying pump 105 with the pump switching pipeline 119.

[0143] When the main conveying pump 104 and the auxiliary conveying pump 105 pump the cooling water in series, the auxiliary pump control valve 115 is opened, the main pump switching valve 120 connects the inlet end of the main conveying pump 104 with the pump switching pipeline 119, and the secondary pump switching valve 121 connects the outlet end of the auxiliary conveying pump 105 with the pump switching pipeline 119. At this time, the cooling water enters from the auxiliary pumping pipeline 111 and is discharged from the main pumping pipeline 110.

[0144] When the main conveying pump 104 and the auxiliary conveying pump 105 pump the cooling water in parallel, the auxiliary pump control valve 115 is opened, the main pump switching valve 120 connects the inlet end of the main conveying pump 104 with the main pumping pipeline 110, and the secondary pump switching valve 121 connects the outlet end of the auxiliary conveying pump 105 with the auxiliary pumping pipeline 111.

[0145] The main cooling control valve 116, the secondary cooling control valve 117, the auxiliary cooling control valve 118, the main cooling switch valve 123, the main cooling switch valve 124, the secondary cooling switch valve 126 and the secondary cooling switch valve 127 are cooperated to realize the main cooler 106 to complete the cooling work alone, or the main cooler 106 and the secondary cooler 107 to complete the cooling work in parallel, or the main cooler 106 and the secondary cooler 107 to complete the cooling work in series, or the main cooler 106, the secondary cooler 107 and the auxiliary cooler 108 to complete the cooling work in series, or the main cooler 106, the secondary cooler 107 and the auxiliary cooler 108 to complete the cooling work in parallel. The main cooling switch valve can connect the inlet of the main cooler 106 with the main cooling pipeline 112 or the main cooling switch pipeline 122; the main cooling switch valve 124 connects the outlet of the secondary cooler 107 with the main cooling switch pipeline or the secondary cooling pipeline 113; the secondary cooling switch valve 126 connects the outlet of the secondary cooler 107 with the secondary cooling switch pipeline 125 or the secondary cooling pipeline 113; the secondary cooling switch valve 127 connects the outlet of the auxiliary cooler 108 with the auxiliary cooling pipeline 114 or the secondary cooling switch pipeline 125.

[0146] When the main cooler 106 completes the cooling work alone, the main cooling control valve 116 and the main cooling control valve 128 are opened, and the main cooling switch valve 123 connects the inlet of the main cooler 106 with the main cooling pipeline 112.

[0147] When the main cooler 106 and the secondary cooler 107 complete the cooling work in series, the secondary cooling control valve 117 and the main cooling control valve 128 are opened, the main cooling control valve 116 is closed, the secondary cooling switch valve 126 connects the inlet of the secondary cooler 107 with the secondary cooling pipeline 113, the main cooling switch valve 124 connects the outlet of the secondary cooler 107 with the main cooling switch pipeline 122, and the main cooling switch valve 123 connects the inlet of the main cooler 106 with the main cooling switch pipeline 122.

[0148] When the main cooler 106 and the secondary cooler 107 complete the cooling work in parallel, the main cooling control valve 116, the secondary cooling control valve 117 and the main cooling control valve 128 are opened; the main cooling switch valve 123 connects the inlet of the main cooler 106 with the main cooling pipeline 112, the main cooling switch valve connects the outlet of the secondary cooler 107 with the secondary cooling pipeline 113, and the secondary cooling switch valve 126 connects the inlet of the secondary cooler 107 with the secondary cooling pipeline 113.

[0149] When the main cooler 106, the secondary cooler 107 and the auxiliary cooler 108 are connected in series to complete the cooling work, the main cooling control valve 116, the main cooling control valve 128 and the main cooling control valve 116 are closed, and the auxiliary cooling control valve 118 is opened; the main cooling switch valve 123 connects the inlet end of the main cooler 106 with the main cooling switch pipeline 122, the main cooling switch pipeline 122 is connected with the outlet end of the secondary cooler 107 through the main cooling switch pipeline 124, the secondary cooling switch pipeline is connected with the inlet end of the secondary cooler 107 through the secondary cooling switch valve 126, and the secondary cooling switch pipeline is connected with the outlet end of the auxiliary cooler 108 through the secondary cooling switch pipeline 127.

[0150] The secondary cooling switch pipeline is connected with the inlet end of the secondary cooler 107.

[0151] When the main cooler 106, the secondary cooler 107 and the auxiliary cooler 108 are connected in parallel to complete the cooling work, the main cooling control valve 116, the main cooling control valve 128, the main cooling control valve 116 and the auxiliary cooling control valve 118 are opened. The main cooling switch valve 123 connects the inlet end of the main cooler 106 with the main cooling pipeline 112, the main cooling switch pipeline 112 is connected with the outlet end of the secondary cooler 107 through the main cooling switch pipeline 124, the secondary cooling switch pipeline is connected with the inlet end of the secondary cooler 107 through the secondary cooling switch valve 126, and the secondary cooling switch pipeline is connected with the outlet end of the auxiliary cooler 108 through the secondary cooling switch pipeline 127.

[0152] The controller adjusts the operation mode of the cooling pump assembly and the cooling temperature assembly by controlling the states of the main cooling control valve 116, the main cooling control valve 128, the main cooling control valve 116, the auxiliary pump control valve 115, the main pump switch valve 120, the secondary pump switch valve 121, the main cooling switch valve 123, the main cooling switch pipeline 124, the secondary cooling switch valve 126 and the secondary cooling switch pipeline 127, so as to realize the delivery work of the cooling water with multiple cooling temperatures and multiple pressures.

[0153] Embodiment 8:

[0154] The embodiment provides a control method of a drill spindle control system, in addition to the technical solutions of the above-mentioned embodiments, and has the following technical features.

[0155] The control method comprises the following steps.

[0156] S1, acquiring the running data of the current main shaft during the drilling work;

[0157] S2, precalculating the temperature value T of the main shaft shell 1 and the change trend according to the running data of the current main shaft, and determining the cooling effect of the external cooling circulation assembly on the main shaft shell 1 according to T and the change trend. S预 S预

[0158] S3, acquiring the current running situation of the external cooling circulation assembly and the cooling water temperature T in the water supply tank 100. C ​​, and the temperature of the cooling water entering the cooling cavity 5 of the other main shaft, according to the temperature value determined in S2 that needs to be cooled to the main shaft housing 1 (that is, the temperature data that needs to be cooled to the main shaft), corrects and adjusts the operation of the cooling cycle assembly later, and synchronously corrects the flow of the cooling water entering the cooling cavity 5 of the other main shaft; and then obtains the temperature T of the main shaft housing in real time during the drilling work of the main shaft S时 ;

[0159] Compare T S阈 with T S时 to determine T S△ ;

[0160] According to T S△ , determine whether the temperature of the main shaft exceeds the threshold value of the shaft temperature difference;

[0161] If not, keep the current operation mode of the cooling pump assembly and the cooling cooling assembly of the external cooling cycle assembly;

[0162] If yes, according to T C and the current operation mode of the cooling pump assembly and the cooling cooling assembly, determine whether T S△ can be kept within the threshold value of the temperature difference by adjusting the cooling pump assembly and the cooling cooling assembly;

[0163] If yes, adjust the temperature, water pressure and flow of the cooling water entering the cooling cavity 5 according to T S△ ; and simultaneously adjust the flow of the cooling water entering the cooling cavity 5 of the other main shaft;

[0164] If not, stop the operation of the main shaft and alarm.

[0165] In the technical solution, before the operation of the main shaft of the drilling machine, the control system first obtains the operation data of the main shaft, that is, the speed and other conditions in each stage during drilling; then according to the operation of the main shaft during drilling, determines the temperature pre-value reached by the main shaft housing 1 and the trend of temperature change, and determines the temperature value that needs to be cooled to the main shaft by the external cooling cycle assembly according to the temperature change trend.

[0166] Then, during the drilling work of the main shaft, the current operation of the external cooling cycle assembly is obtained, the current water temperature in the water supply tank 100 is obtained, and the temperature of the cooling water entering the cooling cavity 5 of the other main shaft is obtained. The temperature value determined in S2 that needs to be cooled is adjusted and corrected to the current operation of the external cooling cycle assembly or the flow of the cooling water entering the cooling cavity 5 of the main shaft. If the temperature value that needs to be cooled cannot be reached under the conditions of the temperature and water pressure of the cooling water output, the water pressure and flow of the cooling water can be increased, or the water temperature of the cooling water can be adjusted; when the water pressure of the cooling water is increased or the water temperature of the cooling water is decreased, the flow of the cooling water entering the cooling cavity 5 of the other main shaft is synchronously corrected, so as to ensure the reasonable use of the cooling water.

[0167] Embodiment 9:

[0168] The embodiment provides a control method of a drill spindle control system, in addition to comprising the technical solutions of the above embodiments, further having the following technical features.

[0169] The operation data of the spindle in S1 includes the material of the workpiece to be drilled, the drilling depth, and the controller determines the proportion of the initial positioning stage, the pre-drilling stage, the stable drilling stage and the tool withdrawal stage in the total drilling time according to the material of the drilling object and the drilling depth, and determines the drilling speed in each stage;

[0170] In S2, the temperature threshold T in each stage is determined according to the material of the workpiece to be drilled and the rotation speed of the drill bit in each stage S预 , the temperature threshold is the maximum preset value of the corresponding stage temperature, and the change trend is determined by the temperature threshold T S预 in each stage, and the operation change of the external cooling circulation assembly is formed according to the change trend;

[0171] Wherein, the operation of the external cooling circulation assembly includes: cooling pump assembly operation mode control and cooling cooling assembly operation mode control; and the temperature T S时 of the spindle shell is obtained at the beginning, middle and end of each stage of drilling S时 , and if the duration of the stage is long, the T S时 of the middle stage can be obtained several times.

[0172] In the technical solution, the material of the workpiece to be drilled and the drilling depth are obtained, so as to determine the time of the initial positioning stage, the pre-drilling stage, the stable drilling stage and the tool withdrawal stage in the drilling process, and the drilling speed in each stage is determined, and the temperature rise of the spindle shell 1 in each stage and the maximum preset value of the temperature in each stage are determined according to the data. According to the maximum preset value, the external cooling circulation assembly can be more accurately controlled; so as to ensure that the operation temperature of the spindle can be maintained within a certain range, so as to ensure the operation performance and service life of the spindle.

[0173] Embodiment 10:

[0174] The embodiment provides a control method of a drill spindle control system, in addition to comprising the technical solutions of the above embodiments, further having the following technical features.

[0175] The cooling pump assembly operation mode control includes:

[0176] M1, the main conveying pump 104 outputs alone;

[0177] M2, the main conveying pump 104 and the auxiliary conveying pump 105 are connected in series.

[0178] M3, the main delivery pump 104 and the auxiliary delivery pump 105 are in parallel output;

[0179] The cooling and temperature reduction component operation mode control includes:

[0180] R1, the main cooler 106 is cooled alone;

[0181] R2, the main cooler 106 and the secondary cooler 107 are in parallel cooled;

[0182] R3, the main cooler 106 and the secondary cooler 107 are in series cooled;

[0183] R4, the main cooler 106, the secondary cooler 107 and the auxiliary cooler 108 are in parallel cooled;

[0184] R5, the main cooler 106, the secondary cooler 107 and the auxiliary cooler 108 are in series cooled.

[0185] In the technical solution, the operation of the cooling and circulating component is a combination of the cooling and pumping component operation mode and the cooling and temperature reduction component operation mode.

[0186] When the cooling and pumping component operation mode is M1, if the water pressure of the cooling water required in the main shaft is insufficient, the output power of the main delivery pump 104 can be increased, or the mode is switched to M2, and the output power of the main delivery pump 104 and the auxiliary delivery pump 105 is adjusted according to the requirement, and the flow of the cooling water into other main shafts is adjusted; if the flow of the cooling water required in the main shaft is insufficient, the output power of the main delivery pump 104 can also be increased, or the mode is switched to M3, and the output power of the pump and the auxiliary delivery pump 105 is adjusted, and the flow of the cooling water into other main shafts is adjusted.

[0187] When the cooling and temperature reduction component operation mode is R1, the temperature of the cooling water required in the main shaft is insufficient; if the flow rate of the cooling water is greater than the threshold value, the output power of the delivery pump can be reduced or the mode is switched to R3, and the flow of the cooling water into other main shafts is adjusted; if the flow rate of the cooling water is in the threshold value, the mode is switched to R2, and the flow of the cooling water into other main shafts is adjusted; if the temperature is still insufficient, the mode is switched to R4, and the flow of the cooling water into other main shafts is adjusted.

[0188] When the operation mode of the cooling and temperature reducing assembly is R2, the temperature of the cooling water in the spindle is insufficient; if the flow rate of the cooling water is greater than the threshold value, the output power of the delivery pump can be reduced, or the mode is switched to R2, and the flow rate of the cooling water into other spindles is adjusted; if the flow rate of the cooling water is in the threshold value, the mode is switched to R4, and the flow rate of the cooling water into other spindles is adjusted.

[0189] When the operation mode of the cooling and temperature reducing assembly is R3, the temperature of the cooling water in the spindle is insufficient; if the flow rate of the cooling water is greater than the threshold value, the output power of the delivery pump can be reduced, or the mode is switched to R5, and the flow rate of the cooling water into other spindles is adjusted; if the flow rate of the cooling water is in the threshold value, the mode is switched to R5, and the flow rate of the cooling water into other spindles is adjusted.

[0190] Through the switching of the cooling and pumping assembly and the cooling and temperature reducing assembly, the delivery of the cooling water with various water pressures, water temperatures and flow rates can be satisfied; and when the water pressure, water temperature or flow rate in any spindle is not in the threshold value, the operation mode of the cooling and pumping assembly and the cooling and temperature reducing assembly is adjusted, and the flow rate of the cooling water into other spindles is adjusted, so that the temperature of all spindles can be stably maintained in a certain range.

[0191] The embodiments of the present application are described above in combination with the drawings, and the embodiments and the features in the embodiments in the present application can be combined with each other without conflict, the present application is not limited to the above-mentioned specific embodiments, the above-mentioned specific embodiments are only illustrative, but not limited, and a person skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the protection scope of the claims, all of which belong to the protection of the present application.

Claims

1. A drilling machine spindle control system, characterized in that, include: Drilling machine spindle; External cooling circulation assembly provides coolant for the drilling machine spindle during operation; A spindle temperature detection component is installed on the spindle housing (1) to detect the heating status of the spindle housing (1); The drilling machine spindle includes: The spindle housing (1) includes a cylindrical body and housing flanges formed at both ends of the cylindrical body; The stator assembly is housed inside the spindle housing (1); The rotor assembly is located inside the stator assembly; The main spindle body (2) is located inside the rotor component, and the main spindle housing (1) extends out from both ends respectively. An external cooling ring is located outside the spindle housing (1); The spindle body (2) wherein a cutting fluid channel (3) is formed in the middle of the spindle body (2); The outer cooling ring includes: The outer ring (4) is fitted outside the spindle housing (1) and forms a cooling cavity (5) between it and the spindle housing (1); and its two ends abut against the two housing flanges respectively. Cooling water inlet (6) is formed on the outer casing flange at one end; Cooling outlet (7) is formed on the outer casing flange at the other end; The cooling water inlet (6) and cooling water outlet (7) are respectively connected to the cooling cavity (5), and a number of cooling grooves are formed on the outer wall of the spindle housing (1) evenly distributed in a circle. Several cooling contact blocks (8) are evenly distributed on the spindle housing (1) in a circumferential manner, and protrusions (9) for sealing the cooling grooves are formed on them. Several buffer support members (10) are respectively disposed between the cooling contact block (8) and the outer ring body (4); The lower floating block (11) is set on the lower outer flange of the cooling water inlet (6) to block the cooling water inlet (6) and forms an annular groove that communicates with the cooling water inlet (6), and forms a connecting hole (12) that communicates with the cooling chamber (5). Several buffer reset components (13) are used to fix the lower floating block (11) evenly on the end face of the outer flange in a circular pattern; The lower floating block (11) has an extrusion guide (14) formed on its outer side, and the cooling contact block (8) has a contact part (15) that cooperates with the extrusion guide (14) on its lower side. The displacement of the lower floating block (11) causes the protrusion (9) on the cooling contact block (8) to leave the cooling tank and move towards the outer ring (4).

2. The drilling machine spindle control system according to claim 1, characterized in that, The external cooling circulation assembly includes: Water supply tank (100) is used to store cooling water; Cooling pumping assembly for pumping cooling water into the outer cooling ring; Cooling and temperature-reducing components are used to cool and reduce the temperature of the coolant supplied to the outer cooling ring; A water tank temperature sensor (101) is used to detect the temperature of the cooling water in the water supply tank (100); The inlet water temperature sensor (102) is used to detect the temperature of the cooling water in the external cooling ring to be input; The inlet water pressure sensor (103) is used to detect the water pressure of the cooling water in the outer cooling ring to be input; A flow control valve (129) is used to control the flow rate of cooling water entering the external cooling ring; The cooling delivery circuit connects the water supply tank, cooling pump assembly, cooling and temperature reduction assembly, and outer cooling ring to form a closed-loop cooling circuit.

3. The drilling machine spindle control system according to claim 2, characterized in that, The cooling pump assembly includes: The main delivery pump (104) is used to deliver cooling water. An auxiliary delivery pump (105) is used in conjunction with the main delivery pump (104) to deliver cooling water; The cooling and heat dissipation component mentioned above: The main cooler (106) is used to cool and lower the temperature of the cooling water; The secondary cooler (107) is used in conjunction with the main cooler (106) to achieve the effect of cooling and reducing temperature; The auxiliary cooler (108) is used in conjunction with the main cooler (106) and the secondary cooler (107) to achieve the effect of cooling and reducing temperature; The cooling delivery circuit can control the cooling water to pass through the main delivery pump (104) and / or auxiliary delivery pump (105) in the cooling pump assembly, and control the cooling water to pass through the main cooler (106) and / or secondary cooler (107) and / or auxiliary cooler (108) in the cooling and cooling assembly.

4. The drilling machine spindle control system according to claim 3, characterized in that, The cooling delivery circuit includes: Cooling return water pipe (109) connects the outlet of the outer cooling ring to the inlet of the water supply tank (100); The pump delivery pipeline includes a main pump delivery pipeline (110) and an auxiliary pump delivery pipeline (111) connected in parallel. One end of the parallel connection is connected to the outlet of the water supply tank (100). The main delivery pump (104) is installed on the main pump delivery pipeline (110), and the auxiliary delivery pump (105) is installed on the auxiliary pump delivery pipeline (111). The cooling delivery pipeline includes a main cooling pipeline (112), a secondary cooling pipeline (113), and an auxiliary cooling pipeline (114) connected in parallel. One end of the parallel connection is connected to the other end of the pumping pipeline, and the other end is connected to the inlet of the outer cooling ring. The main cooler (106) is installed on the main cooling pipeline (112), the secondary cooler (107) is installed on the secondary cooling pipeline (113), and the auxiliary cooler (108) is installed on the auxiliary cooling pipeline (114).

5. The drilling machine spindle control system according to claim 4, characterized in that, The pump delivery pipeline also includes: The pumping switching pipeline (119) is connected at one end to the main pumping pipeline (110) and the inlet side of the main delivery pump (104) is connected and a main pump switching valve (120) is provided at this end. The other end is connected to the auxiliary pumping pipeline (111) and the outlet side of the auxiliary delivery pump (105) is connected and a secondary pump switching valve (121) is provided at this end. The cooling delivery pipeline also includes: The main cooling switching pipeline (122) is connected at one end to the main cooling pipeline (112) between the main cooling control valve (116) and the main cooler (106) and a main cooling switching valve (123) is provided at that end; the other end is connected to the secondary cooling pipeline (113) at the outlet of the secondary cooler (107) and a main cooling switching valve (124) is provided at that end. The secondary cooling switching pipeline (125) is connected at one end to the secondary cooling pipeline (113) between the secondary cooling control valve (117) and the secondary cooler (107), and a secondary cooling switching valve (126) is provided at this end; the other end is connected to the secondary cooling pipeline (114) at the outlet of the secondary cooler (108), and a secondary cooling switching valve (127) is provided at this end.

6. A control method applicable to the spindle control system of a drilling machine according to any one of claims 3-5, characterized in that, include: S1, obtain the operating data of the current spindle when it is drilling; S2, pre-calculate the temperature prediction value T of the spindle housing (1) based on the current spindle operating data. S预 and trends, and based on T S预 The changing trend determines the effect of the external cooling circulation assembly on cooling the spindle housing (1); S3, obtain the current operating status of the external cooling circulation component and the cooling water temperature T in the water supply tank (100). C The temperature of the cooling water entering the inner and outer cooling rings of other spindles is determined according to S2. The cooling effect of the spindle housing (1) is determined to correct and adjust the operation of the cooling circulation assembly in the later stage, and the flow rate of water entering the outer cooling rings of other spindles is corrected simultaneously. Then, the spindle temperature T is obtained in real time when the spindle is drilling. S时 ; T S阈 With T S时 Compare and determine T S△ ; According to T S△ Determine if the spindle temperature exceeds the spindle temperature difference threshold. If not, maintain the current operating mode of the intermediate cooling pump component and cooling cooling component of the external cooling circulation component; If so, then according to T C Based on the current operating mode of the cooling pump assembly and the cooling cooling assembly, it can be determined whether T can be adjusted by modifying the cooling pump assembly and the cooling cooling assembly. S△ Keep within the temperature difference threshold; If possible, then according to T S△ Adjust the temperature, pressure, and flow rate of the cooling water entering the outer cooling ring; simultaneously adjust the flow rate of the cooling water entering other spindles. If not, stop the spindle and issue an alarm.

7. The control method according to claim 6, characterized in that, The spindle operation data obtained in S1 includes the material of the workpiece to be drilled and the drilling depth. The controller determines the proportion of the initial positioning stage, pre-rotation stage, stable rotation stage and retraction stage in the total drilling time based on the material of the workpiece and the drilling depth, and determines the drill bit speed in each stage. In S2, the temperature threshold T for each stage is determined based on the material of the workpiece to be drilled and the drill bit rotation speed at each stage. S预 This temperature threshold is the maximum preset value of the temperature for the corresponding stage, determined by the temperature threshold T in each stage. S预 The changes determine the trend of change, and the operating status of the external cooling circulation components is preset based on the trend of change; The control of the operation of the external cooling circulation components includes: control of the operation mode of the cooling pump component and control of the operation mode of the cooling and cooling components.

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