A high-efficiency cooling device with adjustment detection function for linear motor

Abstract

The present application relates to linear motor cooling technical field, specifically is related to a kind of for linear motor with the high-efficiency cooling device of adjusting detection function, including linear motor, and the water cooler host for providing cooling water for linear motor;Linear motor is equipped with main cooler, precision cooler and secondary component cooler, main cooler is located inside linear motor, precision cooler is attached and set on the upper portion of linear motor, secondary component cooler is set in the lower portion of linear motor;Main cooler and precision cooler are connected in series, and main cooler and precision cooler are connected in parallel into water cooler host as a whole with secondary component cooler by cooling pipeline assembly, secondary component cooler is equipped with shunt type mixed flow divider, and secondary component cooler is communicated with cooling pipeline assembly by shunt type mixed flow divider;The entire cooling pipeline assembly of the present application can provide strong guarantee for the safe and stable operation of linear motor, and can ensure that the temperature rise of linear motor does not exceed 4K.

Description

Technical Field

[0001] This invention relates to the field of linear motor cooling technology, specifically to a high-efficiency cooling device for linear motors with adjustment and detection functions. Background Technology

[0002] To improve production efficiency and the quality of machined parts, high-speed and ultra-high-speed machining has become a major trend in machine tool development. The traditional "rotary motor + ball screw" transmission system can only achieve a maximum feed rate of 30 m / min, which is insufficient for high-speed machining. Linear motors, however, do not suffer from centrifugal force constraints, allowing rapid traverse speeds exceeding 60 m / min. Furthermore, their simple structure, lack of intermediate conversion mechanisms, absence of mechanical contact, and no reverse dead zone have made them increasingly popular among CNC machine tool users. However, linear motors are typically mounted at the bottom of moving parts, a location that hinders natural heat dissipation, requiring reliance on the machine tool's temperature control system.

[0003] Because linear motor drives generate significant heat, forced cooling measures must be implemented to dissipate this heat as quickly as possible. To facilitate pipe connections, most linear motor cooling circuits currently employ a quick-connect series connection of nylon tubing, such as... Figure 5 As shown, the small diameter of the pipeline and the large pressure loss directly affect the cooling effect of the linear motor. Usually, machine tool manufacturers use nylon tubing for quick-connect at the outlet of the water chiller, and then connect the secondary component cooler, precision cooler, and main cooler in sequence. Finally, the cooling water is returned to the water chiller from the outlet of the main cooler to complete the series connection of the cooling water. Therefore, the existing cooling circuit has the following drawbacks: 1. Nylon tubes are easy to connect, but the pipe inner diameter is small, resulting in relatively high pipe resistance and affecting the flow rate of cooling water; 2. The series cooling circuit is relatively long, with a large pressure drop, which increases the head requirement of the water chiller pump and increases the cost; 3. In the series cooling circuit, the cooling water that has already been cooled will be recirculated into the next cooler, and the cooling water temperature will become higher and higher, resulting in a worse cooling effect; 4. There is no flow regulating valve or real-time monitoring of the flow detection switch in the cooling circuit, which is not conducive to troubleshooting problems such as overheating of the linear motor and deviation in accuracy. In order to address the above problems, this application proposes a high-efficiency cooling device with regulating and detecting functions for linear motors. Summary of the Invention

[0004] I. Technical problems to be solved

[0005] This invention addresses the aforementioned deficiencies in existing technologies by proposing a highly efficient cooling device with adjustment and detection functions for linear motors. This solves the problems of poor cooling performance and difficulty in adjustment and detection of existing linear motor cooling devices.

[0006] II. Technical Solution

[0007] To solve the above-mentioned technical problems, the present invention provides a high-efficiency cooling device with adjustment and detection function for a linear motor, including a linear motor and a water cooler main unit for providing cooling water to the linear motor;

[0008] The linear motor is equipped with a main cooler, a precision cooler, and a secondary component cooler. The main cooler is located inside the linear motor, the precision cooler is fitted to the upper part of the linear motor, and the secondary component cooler is located at the lower part of the linear motor.

[0009] The main cooler and the precision cooler are connected in series. The main cooler and the precision cooler, as a whole, are connected in parallel with the secondary component cooler to the water cooler host through a cooling pipe assembly.

[0010] The secondary component cooler is equipped with a flow-diverting hybrid distributor, which connects the secondary component cooler to the cooling piping assembly.

[0011] Among them, there are five sets of linear motors, including two sets of linear motors set on the first X-axis, two sets of linear motors set on the second X-axis, and one set of linear motors on the Y-axis;

[0012] The main unit of the water cooler is equipped with a first water pump and a second water pump. The first water pump is used to provide cooling water for the main cooler, precision cooler and secondary component cooler corresponding to the linear motors on the first X-axis and the second X-axis. The second water pump is used to provide cooling water for the main cooler, precision cooler and secondary component cooler corresponding to the linear motor on the Y-axis.

[0013] In this system, the cooling water of the main water cooler is transmitted through pipelines to the end of the main cooler and the secondary component cooler near the linear motor, and then splits into parallel circuits.

[0014] The main pipeline of the cooling pipeline assembly uses a flexible hose with an inner diameter greater than 15mm.

[0015] The main pipeline of the cooling pipeline assembly uses a flexible hose with an inner diameter of 19mm.

[0016] The water cooler main unit is equipped with two return water ports. One return water port corresponds to the cooling water return flow of the first X-axis and the second X-axis, and the other return water port corresponds to the cooling water return flow of the Y-axis. Flow detection switches are installed at the two return water ports respectively.

[0017] In particular, a visible flow regulating valve is installed in the middle of the return water pipe of each cooling branch of the cooling pipe assembly.

[0018] The linear motors on the first and second X-axis are model 1FN3600-3WB00; the linear motor on the Y-axis is model 1FN3600-4WB00.

[0019] III. Beneficial Effects

[0020] Compared with the prior art, the entire cooling pipeline assembly of the present invention uses large-diameter pipes for connection, and then connects in parallel at each cooler interface to minimize the pressure loss of external connection pipelines. Each branch uses a flow regulating valve to regulate and distribute the flow of the water pump of the water cooling machine, eliminating uneven flow caused by different back pressures of the branches. A flow detection switch is used on the main circuit to monitor the flow in real time. If any branch has an abnormality, it can trigger the alarm signal of the flow detection switch, and the source of the problem can be quickly investigated through the flow regulating valve, providing a strong guarantee for the safe and stable operation of the linear motor.

[0021] By using a parallel structure and a split-type hybrid distributor, along with proper piping, the temperature rise of the linear motor can be kept below 4K. Attached Figure Description

[0022] Figure 1 A three-dimensional schematic diagram of a high-efficiency cooling device with adjustment and detection function for linear motors. Figure 1 ;

[0023] Figure 2 A three-dimensional schematic diagram of a high-efficiency cooling device with adjustment and detection function for linear motors. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of a split-type hybrid splitter;

[0025] Figure 4 This is a schematic diagram showing the distribution of the main cooler, precision cooler, and secondary component coolers of a linear motor.

[0026] Figure 5 This is a schematic diagram showing the distribution of the main cooler, precision cooler, and secondary component coolers in a series configuration.

[0027] In the picture:

[0028] 1 is a linear motor; 2 is the main cooler; 3 is a precision cooler; 4 is a secondary component cooler; 5 is the main water cooler unit.

[0029] 11 is the first X-axis; 12 is the second X-axis; 13 is the Y-axis; 41 is the flow detection switch; 42 is the flow regulating valve; 43 is the flow-dividing type mixing distributor; 51 is the return water port. Detailed Implementation

[0030] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0031] Example 1:

[0032] like Figures 1 to 4 As shown, this embodiment of a high-efficiency cooling device for a linear motor with adjustment and detection function includes a linear motor 1 and a water cooler host 5 for providing cooling water to the linear motor 1.

[0033] The linear motor 1 is equipped with a main cooler 2, a precision cooler 3 and a secondary component cooler 4. The main cooler 2 is located inside the linear motor 1, the precision cooler 3 is attached to the upper part of the linear motor 1, and the secondary component cooler 4 is located at the lower part of the linear motor 1.

[0034] The main cooler 2 and the precision cooler 3 are connected in series. The main cooler 2 and the precision cooler 3, as a whole, are connected in parallel with the secondary component cooler 4 through the cooling pipe assembly 6 to the water cooler host 5.

[0035] The secondary component cooler 4 is equipped with a flow-dividing hybrid distributor 43, which connects the secondary component cooler 4 to the cooling pipe assembly 6.

[0036] The linear motor 1 is provided in five sets, including two sets of linear motors set on the first X-axis 11, two sets of linear motors set on the second X-axis 12, and one set of linear motors set on the Y-axis 13. In this embodiment, when the X-axis and Y-axis are running at a maximum rapid traverse speed of 60m / min, the maximum temperature rise of the linear motor 1 will not exceed 4K, and will eventually stabilize within a very small temperature rise range, which fully meets the predetermined requirements.

[0037] The water cooler main unit 5 is equipped with a first water pump and a second water pump. The first water pump is used to provide cooling water for the main cooler 2, precision cooler 3 and secondary component cooler 4 corresponding to the linear motor 1 on the first X-axis 11 and the second X-axis 12. The second water pump is used to provide cooling water for the main cooler 2, precision cooler 3 and secondary component cooler 4 corresponding to the linear motor 1 on the Y-axis 13.

[0038] The cooling water of the water cooler host 5 is transmitted through pipelines to the vicinity of the end of the main cooler 2 and the secondary component cooler 4 near the linear motor 1, and then splits into parallel circuits.

[0039] The water cooler main unit 5 has two return water inlets 51. One return water inlet 51 corresponds to the cooling water return from the first X-axis 11 and the second X-axis 12, and the other return water inlet 51 corresponds to the cooling water return from the Y-axis 13. Flow detection switches 41 are installed at each of the two return water inlets 51. A visible flow regulating valve 42 is installed in the middle of the return water pipe of each cooling branch of the cooling pipe assembly 6. The flow regulating valve ensures a stable and consistent flow rate in each cooling branch, preventing uneven flow rates that could affect the linear motor's temperature rise. The flow detection switches monitor the entire cooling circuit in real time. If any branch is blocked or damaged, the flow detection switch will immediately output an alarm signal to prevent overheating of the linear motor from causing accuracy deviations and resulting in the scrapping of machined parts. Furthermore, after an alarm occurs, the problem can be quickly located by checking the flow regulating valves, greatly improving the efficiency of troubleshooting and resolving the issue.

[0040] Taking the Y-axis as an example, the experiment is conducted as follows: The water cooler is turned on, and the total flow rate of the Y-axis main circuit is observed through the flow detection switch of the Y-axis main circuit. The reading of the branch flow regulating valve is checked and adjusted to 6 L / min. The Y-axis of the machine tool is run, and it is checked whether there are large fluctuations in the flow rate displayed by the flow detection switch. One of the cooling branch flow regulating valves of the Y-axis is deliberately closed, and the total flow rate is checked through the flow detection switch to see if it also decreases accordingly. The alarm flow rate value of the flow detection switch is set, and then one flow regulating valve is closed. It is checked whether the flow detection switch will output an alarm signal. In this embodiment, the alarm flow rate of the X-axis is set to 33 L / min, and the alarm flow rate of the Y-axis is set to 12 L / min.

[0041] The test results show that the flow rates of the X-axis and Y-axis main circuits can reach the expected targets, and the flow rates of each branch can be adjusted to the predetermined requirements through flow regulating valves. Furthermore, there are no significant fluctuations in flow rate during triaxial operation. In addition, monitoring the flow rate of the main circuit with only one flow detection switch can also reflect the status of the cooling water in each branch, greatly saving the cost of flow detection switches.

[0042] The actual application process of the cooling device in this embodiment is as follows:

[0043] The linear motor 1 on the first X-axis 11 and the second X-axis 12 is model 1FN3600-3WB00; the linear motor 1 on the Y-axis 13 is model 1FN3600-4WB00; these model numbers can be found in Siemens documentation.

[0044] The maximum heat dissipation of the 1FN3600-3WB00 is as follows:

[0045] Main cooler heat dissipation: Q P，H，MAX =2800W

[0046] Precision cooler heat dissipation: Q P，P，MAX =82.5W

[0047] Secondary component cooler heat dissipation: Q S，MAX =265W

[0048] The maximum heat dissipation of the 1FN3600-4WB00 is as follows:

[0049] Main cooler heat dissipation: Q P，H，MAX =3400W

[0050] Precision cooler heat dissipation: Q P，P，MAX =99.9W

[0051] Secondary component cooler heat dissipation: Q S，MAX =321W

[0052] According to the effective force F of the load cycle eff =0.8F N To calculate, the required cooling power of the water-cooled machine is:

[0053]

[0054] In the formula, Q K，MAX W represents the heat dissipated by the cooling components of the linear motor under full load.

[0055] For the maximum heat dissipation of the X-axis 1FN3600-3WB00 linear motor (heat dissipation of 4 sets of linear motors):

[0056] Main cooler heat dissipation: P Kühl，P，H =Q P，H ≈2800W·0.8 2 ·4=7168W

[0057] Precision cooler heat dissipation: P Kühl，P，P =Q P，P =82.5W·0.8 2 ·4=211.2W

[0058] Secondary component cooler heat dissipation: P Kühl，S =Q s =265W.0.8 2 ·2=339.2W

[0059] For the maximum heat dissipation of the Y-axis 1FN3600-4WB00 linear motor (heat dissipation of 1 set of linear motors):

[0060] Main cooler heat dissipation: P Kühl，PH =Q P，H ≈3400W·0.8 2 =2176W

[0061] Precision cooler heat dissipation: P Kühl，P，P =Q P，P =99.9W·0.8 2 =63.936W

[0062] Secondary component cooler heat dissipation: P Kühl，S =Q S =321W.0.8 2 =205.44W

[0063] Therefore, for the entire cooling system, the minimum cooling power required by the water cooler is:

[0064] P Kühl，gesamt =7168+211.2+339.2+2176+63.936+205.44=10163.776W

[0065] Therefore, a high-precision variable frequency water cooler with a cooling power of 15kW was selected.

[0066] Calculation of cooling circuit pressure drop:

[0067] Based on the required flow rates of the main cooler 2, precision cooler 3, and secondary component cooler 4, the pressure loss in the cooling circuit is calculated. This calculation then determines the specifications of the water pump for the water chiller, ensuring the cooling water can reach the required flow rate for the linear motor's cooling components. For ease of calculation, only laminar flow of the cooling water in the pipes is considered, with the pressure loss being [missing information].

[0068] Formula 1:

[0069]

[0070] In Formula 1 above, R e ρ is the Reynolds number; ρ is the density of the cooling water, kg / m³. 3 ; 1 is the pipe length, m; d is the pipe inner diameter, mm; v is the cooling water flow velocity, m / s.

[0071] As can be seen from the formula, in laminar flow, the pressure loss of liquid flowing through a straight pipe is directly proportional to the pipe length and flow velocity, and inversely proportional to the square of the pipe diameter. Because the flow rate of the linear motor's cooling components needs to be met, if it is desired to reduce the pressure loss of cooling water in the pipes, it is necessary to minimize the pipe length and increase the pipe's inner diameter. Therefore, the most direct way to reduce pipe length is to adopt a parallel cooling circuit design. On the one hand, the secondary component cooler adopts a split-flow type mixing splitter, such as... Figure 3As shown, cooling water enters from one end of the mixing distributor, flows through the cooling profile, and exits from the other end. The pressure loss of the cooling water through the cooling profile only needs to be calculated for one section. If a flow-guiding type mixing distributor is used, the pressure loss of the cooling water through the cooling profile needs to be calculated for both sections. On the other hand, the main cooler 2 and the precision cooler 3 are connected in series. The main cooler 2 and the precision cooler 3, as a whole, are connected in parallel with the secondary component cooler 4 to the water cooler host 5 through the cooling pipe assembly 6. The secondary component cooler 4 is equipped with a flow-guiding type mixing distributor, which connects the secondary component cooler 4 to the cooling pipe assembly 6. Compared with the series loop design, the main pipe of the cooling pipe assembly 6 generally uses a flexible hose with an inner diameter greater than 15mm. In this embodiment, the main pipe of the cooling pipe assembly 6 uses a flexible hose with an inner diameter of 19mm, which can greatly reduce the length of the pipe and thus reduce the pressure loss of the cooling water.

[0072] Calculate the pressure loss generated by the three cooling components of the linear motor itself (data can be found in Siemens documentation):

[0073] Pressure loss of cooling components in 1FN3600-3WB00 linear motor:

[0074] Main cooler: Δp P，H =1.02 bar

[0075] Precision cooler: Δp P，P =1.54 bar

[0076] Hybrid splitter: Δp KV =0.182 bar

[0077] per meter of cooling profile: Δps = 0.0234 bar (in this embodiment, the length of the cooling profile is 5.371 meters on each side).

[0078] The pressure losses of the cooling components for the X-axis 1FN3600-3WB00 linear motor are as follows:

[0079] Main cooler + precision cooler: Δp gesamt，X =Δp P，H +Δp P，P =2.56 bar

[0080] Secondary cooling components: Δp S，ges，X =Δp KV .2+Δp s 0.5.371 = 0.49 bar

[0081] Pressure loss of cooling components in 1FN3600-4WB00 linear motor:

[0082] Main cooler: Δp P，H=1.55 bar

[0083] Precision cooler: Δp P，P =2.21 bar

[0084] Hybrid splitter: Δp KV =0.223 bar

[0085] per meter of cooling profile: Δp s = 0.0272 bar (In this embodiment, the length of the cooling profile is 3.163 meters)

[0086] The pressure losses of the cooling components of the Y-axis 1FN3600-4WB00 linear motor are as follows:

[0087] Main cooler + precision cooler: Δp gesamt，Y =Δp P，H +Δp P，P = 3.76 bar

[0088] Secondary cooling components: Δp S，ges，Y =Δp KV ·2+Δp s 3.163 = 0.53 bar

[0089] To ensure that the cooling circuits of the X-axis and Y-axis linear motors do not interfere with each other, such as Figure 1 As shown, the water-cooled unit is designed with two water pumps to supply cooling water to the cooling components of the linear motors on both axes. The main pipeline has an inner diameter of 19mm, and Siemens requires flow rates of 5.5 L / min and 6 L / min for the linear motor cooling components, respectively. Based on the inner diameter of the main pipeline and the flow rates of the cooling components, the flow velocities of the cooling water on the X and Y axes can be calculated respectively.

[0090] V = q / s

[0091] In the formula, q is the cooling water flow rate, l / min; s is the pipe cross-sectional area, m². 2 .

[0092] Flow rate of the 19mm inner diameter flexible tube (X-axis): v X =0.32m / s

[0093] Flow rate of 19mm inner diameter flexible hose along the Y-axis: v Y =0.35m / s

[0094] Based on the flow velocity, pipe inner diameter, and cooling water viscosity, the Reynolds numbers for the X and Y axes can be calculated separately:

[0095] In the formula, v is the flow velocity of the cooling water, m / s; d is the inner diameter of the pipe, mm; and η is the viscosity of the cooling water, mm. 2 / s. Wherein, the viscosity of the cooling water is taken as η = 1 mm. 2 / s.

[0096] 19mm inner diameter flexible hose (X-axis) Reynolds number: R e，X =6080

[0097] 19mm inner diameter flexible hose (Y-axis) Reynolds number: R e，Y =6650

[0098] According to Formula 1, the density of cooling water is taken as 1000 kg / m³. 3 Calculate the pressure loss of the external main circuit along the X and Y axes respectively (calculate the maximum pressure loss based on the longest pipeline):

[0099] X-axis main cooler + precision cooler circuit:

[0100]

[0101] X-axis secondary component cooler circuit:

[0102]

[0103] Y-axis main cooler + precision cooler circuit:

[0104]

[0105] Y-axis secondary component cooler circuit:

[0106]

[0107] The total pressure loss of the cooling components for the X-axis 1FN3600-3WB00 linear motor is:

[0108] Main cooler + clean cooler:

[0109] Δp gesamt，XMAX =Δp gesamt，X +Δp X1 =3.41 bar

[0110] Secondary cooling components:

[0111] ΔP S，g es, XMAX = ΔP S，ges，X +Δp X2 =0.94 bar

[0112] The pressure loss of the entire X-axis cooling circuit is taken as:

[0113] Δp gesamt，XMAX =3.41 bar

[0114] The pressure losses of the cooling components of the Y-axis 1FN3600-4WB00 linear motor are as follows:

[0115] Main cooler + precision cooler:

[0116] ΔP gesamt，YMAX =Δp gesamt，Y +Δp Y1 =4.75 bar

[0117] Secondary cooling components:

[0118] Δp S，ges，YMAX =Δp S，ges，Y +Δp Y2 =1.15 bar

[0119] The pressure loss of the entire cooling circuit along the Y-axis is taken as:

[0120] Δp S，ges，YMAX =4.75 bar

[0121] Based on the maximum pressure loss value, select two water pump specifications for the water cooler, with maximum outlet pressures of 4.5 bar and 6.2 bar respectively.

Claims

1. A high-efficiency cooling device with adjustment detection function for a linear motor, characterized by, The high-efficiency cooling device with adjustment and detection function for the linear motor includes the linear motor (1) and the water cooler host (5) for providing cooling water to the linear motor (1). The linear motor (1) is provided with a main cooler (2), a precision cooler (3) and a secondary component cooler (4). The main cooler (2) is located inside the linear motor (1), the precision cooler (3) is attached to the upper part of the linear motor (1), and the secondary component cooler (4) is located at the lower part of the linear motor (1). The main cooler (2) and the precision cooler (3) are connected in series. The main cooler (2) and the precision cooler (3) are connected in parallel with the secondary component cooler (4) through the cooling pipe assembly (6) to the water cooler host (5). The linear motor (1) is provided in five sets, including two sets of linear motors set on the first X-axis (11), two sets of linear motors set on the second X-axis (12) and one set of linear motors on the Y-axis (13); The main unit (5) of the water cooler is equipped with a first water pump and a second water pump. The first water pump is used to provide cooling water to the main cooler (2), precision cooler (3) and secondary component cooler (4) corresponding to the linear motor (1) on the first X-axis (11) and the second X-axis (12). The second water pump is used to provide cooling water to the main cooler (2), precision cooler (3) and secondary component cooler (4) corresponding to the linear motor (1) on the Y-axis (13).

2. The high-efficiency cooling device with adjustment detection function for linear motor according to claim 1, characterized in that, The secondary component cooler (4) is equipped with a flow-dividing hybrid distributor, which connects the secondary component cooler (4) to the cooling pipeline assembly (6).

3. The high-efficiency cooling device with adjustment detection function for linear motor according to claim 1, characterized in that, The cooling water of the main water cooler (5) is routed to the end of the main cooler (2) and the secondary component cooler (4) near the linear motor (1) via pipelines to achieve parallel connection.

4. The high-efficiency cooling device with adjustment detection function for linear motor according to claim 3, characterized in that, The main pipeline of the cooling pipeline assembly (6) is a flexible hose with an inner diameter greater than 15 mm.

5. The high-efficiency cooling device with adjustment detection function for linear motor according to claim 3, characterized in that, The main pipeline of the cooling pipeline assembly (6) is a flexible hose with an inner diameter of 19 mm.

6. The high-efficiency cooling device with adjustment detection function for linear motor according to claim 1, characterized in that, The main unit of the water cooler (5) is provided with two return water ports (51). One return water port (51) corresponds to the return of cooling water from the first X-axis (11) and the second X-axis (12), and the other return water port (51) corresponds to the return of cooling water from the Y-axis (13). Flow detection switches (41) are installed at the two return water ports (51) respectively.

7. A high-efficiency cooling device with adjustment and detection function for a linear motor according to claim 1, characterized in that, A visible flow regulating valve (42) is installed in the middle of the return water pipe of each cooling branch of the cooling pipe assembly (6).

8. A high-efficiency cooling device with adjustment and detection function for a linear motor according to claim 1, characterized in that, The linear motors (1) on the first X-axis (11) and the second X-axis (12) are model 1FN3600-3WB00; the linear motors (1) on the Y-axis (13) are model 1FN3600-4WB00.

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