Ball screw pair cooling device and machine tool

Abstract

The utility model provides a ball screw pair cooling device and a machine tool. A ball screw pair cooling device comprises a screw rod, a cooling nut assembly and balls. The cooling nut assembly is movably arranged on the side face of the screw rod. The ball is arranged between the lead screw and the cooling nut assembly in a matched mode. And when the cooling nut assembly moves along the lead screw, the balls pass through the cooling position of the cooling nut assembly, so that the balls are cooled. The technical problem that in the prior art, a cooling pipeline is arranged in a lead screw, the cooling effect of the cooling pipeline on an assembly structure on the outer side of the lead screw is poor, heat generated by friction among a nut, a ball and the lead screw is difficult to dissipate in time, and therefore the overall precision of the ball screw pair is reduced is solved.

Description

Technical Field

[0001] This utility model relates to the field of ball screw pair technology, and more specifically, to a ball screw pair cooling device and a machine tool. Background Technology

[0002] With the continuous improvement of industrial levels, machine tools have become indispensable equipment for the machining of most precision parts. Ball screw assemblies, as an important component of machine tools, are used to ensure the stability and accuracy of high-precision parts machining processes. This technology includes highly precise linear motion systems. During operation, the friction between the nut and the screw generates high temperatures. Cooling pipes are typically installed inside the screw body to cool it down and prevent thermal deformation of the linear guide assembly.

[0003] However, the relevant technology has at least one of the following problems: because the cooling pipe is located inside the lead screw in the existing technology, the cooling pipe has a poor heat dissipation effect on the external component structure of the lead screw, which makes it difficult to dissipate the heat generated by friction between the nut, ball, and lead screw in a timely manner, thereby reducing the overall accuracy of the ball screw pair. Utility Model Content

[0004] The technical problem solved by this utility model is that, in the prior art, the cooling pipe is set inside the lead screw, and the cooling pipe has a poor heat dissipation effect on the external component structure of the lead screw, which makes it difficult to dissipate the heat generated by friction between the nut, ball, and lead screw in a timely manner, thereby reducing the overall accuracy of the ball screw pair.

[0005] To address the aforementioned problems, this utility model provides a ball screw pair cooling device, comprising a screw, a cooling nut assembly, and balls. The cooling nut assembly is movably disposed on the side of the screw, and both ends of the cooling nut assembly are provided with cooling positions for holding coolant. The balls are fitted between the screw and the cooling nut assembly. When the cooling nut assembly moves along the screw, the balls pass through the cooling positions of the cooling nut assembly to achieve cooling of the balls.

[0006] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: A cooling nut assembly with heat dissipation effect, when the cooling nut assembly moves on the lead screw, it drives the balls between the lead screw and the cooling nut to roll along the raceway. When the balls pass through the cooling position of the cooling nut assembly, the balls are cooled down, thereby effectively improving the dissipation of heat generated by friction between the cooling nut assembly, the lead screw, and the balls.

[0007] In one embodiment of this utility model, the cooling nut assembly includes a nut seat and a cooling device; the nut seat is movably disposed on the side of the lead screw; the cooling device is fitted onto the nut seat; wherein, the cooling position is located at both ends of the nut seat, the cooling device is fixedly disposed at the cooling position, and a raceway is provided on the side of the nut seat near the lead screw, the raceway is used to pass through the ball bearings, and the raceway is connected to the cooling device.

[0008] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: when the nut seat moves linearly along the direction of the lead screw, the balls move along the direction of the raceway. Since the raceway is connected to the cooling device, the balls can move through the raceway in the nut seat to the inside of the cooling device to cool the balls. After cooling, the balls return to the raceway to continue the next cycle, which improves the cooling efficiency of the balls.

[0009] In one embodiment of this utility model, the cooling device includes a cooling sleeve assembly; the cooling sleeve assembly is sleeved on the outside of the nut seat; wherein, the cooling sleeve assembly is provided with a receiving space for holding coolant.

[0010] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: the cooling sleeve is fixed on the outside of the nut seat by means of a sleeve connection, so as to fix the coolant used for cooling on the nut seat. This structure is simple and convenient, and improves the efficiency of installation and disassembly.

[0011] In one embodiment of this utility model, the cooling sleeve assembly includes a first cooling sleeve and a second cooling sleeve; the first cooling sleeve is fitted onto one end of the nut seat; and the second cooling sleeve is fitted onto the other end of the nut seat.

[0012] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: by setting a first cooling sleeve and a second cooling sleeve at both ends of the nut seat, the ball bearings can be cooled more evenly and effectively, thereby improving the heat dissipation effect of the ball screw pair.

[0013] In one embodiment of this utility model, the cooling device includes a first cooling reverser and a second cooling reverser; the first cooling reverser is located on the side of the first cooling sleeve near the nut seat; the second cooling reverser is located on the side of the second cooling sleeve near the nut seat; wherein the first cooling reverser, the second cooling reverser and the raceway cooperate with each other to form a closed loop circuit, so that the balls enter the cooling sleeve assembly and return to the raceway after cooling.

[0014] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: The first cooling reverser and the second cooling reverser are respectively set in the first cooling sleeve and the second cooling sleeve to limit the movement trajectory of the ball in the cooling sleeve assembly. This allows the ball to pass through the cooling device more accurately and quickly and return to the raceway when it leaves the raceway, and to continuously repeat this action. This achieves effective cooling of the ball and reverses its movement trajectory while avoiding blockage of the ball in the cooling sleeve assembly, which would otherwise lead to damage to the ball screw pair.

[0015] In one embodiment of this utility model, the first cooling reverser includes a first inlet bead pipe section and a first return bead pipe section; the second cooling reverser includes a second inlet bead pipe section and a second return bead pipe section; wherein, the first inlet bead pipe section is aligned in the same direction with the corresponding connected raceway, the second inlet bead pipe section is aligned in the same direction with the corresponding connected raceway, and the first return bead pipe section and the second return bead pipe section are interconnected.

[0016] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: the central axis of the first ball inlet pipe coincides with the central axis of the raceway at its corresponding connection, which makes the ball enter the first cooling reverser more smoothly; the central axis of the second ball inlet pipe coincides with the central axis of the raceway at its corresponding connection, which similarly makes the ball enter the second cooling reverser more smoothly; the first ball return pipe and the second ball return pipe are interconnected to ensure that the cooled steel balls can return to the inside of the raceway.

[0017] In one embodiment of this utility model, the cooling device further includes a liquid flow rate meter, which is installed in conjunction with the cooling sleeve to control the flow rate of the coolant.

[0018] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: the liquid flow rate device is used to control the flow rate of the coolant exchanged between the coolant inside the cooling unit and the coolant outside. By controlling the change in flow rate, a better cooling effect can be achieved for the ball bearings.

[0019] In one embodiment of this invention, the cooling device further includes a temperature controller, which is communicatively connected to a liquid flow meter to control the temperature of the coolant.

[0020] Compared with existing technologies, the technical effects achieved by this solution are as follows: the temperature controller is used to control the flow rate of the coolant based on the detected temperature, thereby achieving more precise temperature control between the nut seat and the lead screw.

[0021] In one embodiment of this utility model, the temperature controller includes a first temperature sensor and a second temperature sensor; the first temperature sensor is disposed on the side of the nut seat near the lead screw, and is used to obtain a first temperature between the nut and the lead screw; the second temperature sensor is disposed in the receiving space, and is used to obtain a second temperature of the coolant.

[0022] Compared with the existing technology, the technical effects achieved by adopting this technical solution are as follows: the first temperature sensor and the second temperature sensor are used to obtain the real-time temperature of the coolant in the cooling sleeve and the real-time temperature in the nut seat and the lead screw, respectively. Based on the obtained real-time temperature, the temperature can be controlled more accurately.

[0023] This utility model provides a machine tool, which includes a ball screw pair cooling device with any of the above features.

[0024] By adopting the technical solution of this utility model, the following technical effects can be achieved:

[0025] (1) When the cooling nut assembly moves on the lead screw, it drives the ball between the lead screw and the cooling nut to roll along the raceway. When the ball passes the cooling function position of the cooling nut assembly, it cools the ball, thereby effectively improving the dissipation of heat generated by friction between the cooling nut assembly, the lead screw and the ball.

[0026] (2) The cooling sleeve is fixed on the outside of the nut seat by means of a sleeve connection so that the coolant used for cooling is fixed on the nut seat. This structure is simple and convenient, and improves the efficiency of installation and disassembly.

[0027] (3) The first cooling reverser and the second cooling reverser are respectively set in the first cooling sleeve and the second cooling sleeve to restrict the movement trajectory of the ball in the cooling sleeve assembly. This allows the ball to pass through the cooling device more accurately and quickly when it leaves the raceway and return to the raceway. This action is repeated continuously, which achieves effective cooling of the ball and reverses its movement trajectory while avoiding blockage of the ball in the cooling sleeve assembly, thus preventing damage to the ball screw pair. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the structure of a ball screw pair cooling device provided by this utility model;

[0030] Figure 2 for Figure 1 A schematic diagram of the cooling nut assembly from another perspective;

[0031] Figure 3 for Figure 2 A schematic diagram of the nut seat and cooling device from another perspective;

[0032] Figure 4 for Figure 3 A schematic diagram of the cooling device from another perspective;

[0033] Figure 5 for Figure 4 Sectional view at point AA;

[0034] Figure 6 for Figure 3 A schematic diagram of the cooling device structure from another perspective;

[0035] Figure 7 for Figure 6 A schematic diagram of the cooling device from another perspective;

[0036] Figure 8 for Figure 7 Sectional view at point BB.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100. Cooling nut assembly; 101. Nut seat; 102. First cooling sleeve; 103. Second cooling sleeve; 104. Liquid flow meter; 105. Temperature controller; 106. First cooling reverser; 1061. First bead inlet pipe section; 1062. First bead return pipe section; 107. Second cooling reverser; 1071. Second bead inlet pipe section; 1072. Second bead return pipe section; 108. Raceway; 200. Lead screw. Detailed Implementation

[0039] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0040] This utility model provides a ball screw pair cooling device, including a screw 200, a cooling nut assembly 100, and balls. The cooling nut assembly 100 is movably disposed on the side of the screw 200, and both ends of the cooling nut assembly 100 are provided with cooling positions for holding coolant. The balls are fitted between the screw 200 and the cooling nut assembly 100. When the cooling nut assembly 100 moves along the screw 200, the balls pass through the cooling positions of the cooling nut assembly 100 to achieve cooling of the balls.

[0041] Furthermore, the cooling nut assembly 100 includes a nut seat 101 and a cooling device; the nut seat 101 is movably disposed on the side of the lead screw 200; the cooling device is fitted onto the nut seat 101, wherein the cooling positions are located at both ends of the nut seat 101, and the cooling device is fixedly disposed at the cooling positions; a raceway 108 is provided on the side of the nut seat 101 near the lead screw 200, the raceway 108 is used to pass balls, and the raceway 108 is connected to the cooling device.

[0042] like Figure 1 and Figure 2 As shown, specifically, the nut seat 101 is a flange nut. The cooling nut assembly 100 moves along the shaft direction of the lead screw 200 due to the rolling of the balls. While the balls rotate, they also move relative to the structural part of the nut seat 101 of the cooling nut assembly 100. The raceway 108 inside the nut seat 101 is a non-closed channel. One end of the raceway 108 is located on one side of the nut seat 101, and the other end is located on the other side. The cooling positions of the cooling nut assembly 100 are located on both sides of the nut seat 101. When the balls exit from the raceway 108, they enter the cooling positions of the cooling nut assembly 100 to cool the balls. A ball return device is provided at the cooling positions to return the cooled balls to the raceway 108 of the nut seat 101, and this cycle continues.

[0043] In one embodiment of this utility model, the cooling device includes a cooling sleeve assembly; the cooling sleeve assembly is sleeved on the outside of the nut seat 101; wherein, the cooling sleeve assembly is provided with a receiving space for holding coolant.

[0044] Specifically, the cooling sleeve corresponds to the structure of the nut seat 101 and can be fixed to the nut seat 101 by sleeve connection. The outer side of the cooling sleeve is provided with a liquid inlet and a liquid outlet, which are respectively connected to an external coolant delivery device to deliver new coolant into the cooling sleeve and to recover the coolant that has lost its cooling effect to the external cooling tower to restore its cooling function.

[0045] In one embodiment of this utility model, the cooling sleeve assembly includes a first cooling sleeve 102 and a second cooling sleeve 103; the first cooling sleeve 102 is sleeved on one end of the nut seat 101; and the second cooling sleeve 103 is sleeved on the other end of the nut seat 101.

[0046] Specifically, the first cooling sleeve 102 and the second cooling sleeve 103 dissipate heat from the balls rolling out from both ends of the nut seat 101, so as to achieve a more uniform cooling effect.

[0047] In one embodiment of this utility model, the cooling device includes a first cooling reverser 106 and a second cooling reverser 107; the first cooling reverser 106 is disposed on the side of the first cooling sleeve 102 near the nut seat 101; the second cooling reverser 107 is disposed on the side of the second cooling sleeve 103 near the nut seat 101; wherein, the first cooling reverser 106, the second cooling reverser 107 and the raceway 108 cooperate with each other to form a closed loop circuit, so that the balls enter the cooling sleeve assembly and return to the raceway 108 after cooling.

[0048] like Figures 3 to 8 As shown, specifically, one end of the first cooling reverser 106 is connected to the end of the raceway 108 near the first side, and the other end of the first cooling reverser 106 is connected to one end of the second cooling reverser 107. The end of the second cooling reverser 107 away from the first cooling reverser 106 is connected to the end of the raceway 108 near the second side, forming a closed-loop path that allows the balls to circulate. The first cooling reverser 106 fits against the inner surface of the first cooling sleeve 102, enabling the balls to achieve efficient cooling when entering the first cooling reverser 106. The second cooling reverser 107 fits against the inner surface of the second cooling sleeve 103, enabling the balls to achieve efficient cooling when entering the second cooling reverser 107.

[0049] In one embodiment of this utility model, the first cooling reverser 106 includes a first bead inlet pipe section 1061 and a first bead return pipe section 1062; the second cooling reverser 107 includes a second bead inlet pipe section 1071 and a second bead return pipe section 1072; wherein, the first bead inlet pipe section 1061 and its corresponding connected raceway 108 are aligned in the same direction, the second bead inlet pipe section 1071 and its corresponding connected raceway 108 are aligned in the same direction, and the first bead return pipe section 1062 and the second bead return pipe section 1072 are interconnected.

[0050] like Figure 5 and Figure 8 As shown, specifically, the central axis of the first ball inlet channel 1061 coincides with the central axis of the first side raceway 108 of the nut seat 101, making the ball enter the first ball inlet channel 1061 more smoothly through the raceway 108. The central axis of the second ball inlet channel 1071 coincides with the central axis of the second side raceway 108 of the nut seat 101, making the ball enter the second ball inlet channel 1071 more smoothly through the raceway 108. The first ball return channel 1062 and the second ball return channel 1072 are connected to each other by a straight channel, which is perpendicular to the first side of the nut seat 101. The first ball inlet channel 1061 and the first ball return channel 1062 are connected to each other by an arc-shaped channel. The second ball inlet channel 1071 and the second ball return channel 1072 are connected to each other by an arc-shaped channel.

[0051] In one embodiment of this utility model, the cooling device further includes a liquid flow rate device 104, which is configured in conjunction with the cooling sleeve to control the flow rate of the coolant.

[0052] like Figure 3 As shown, specifically, the liquid flow meter 104 includes an input pipe and an output pipe. The input pipe is used to control the coolant entering the cooling unit, and the output pipe is used to control the coolant output from the cooling unit.

[0053] Preferably, the cooling device further includes a temperature controller 105, which is communicatively connected to the liquid flow meter 104 to control the temperature of the coolant.

[0054] Furthermore, the temperature controller 105 includes a first temperature sensor and a second temperature sensor; the first temperature sensor is located on the side of the nut seat 101 near the lead screw 200, and is used to obtain the first temperature between the nut seat 101 and the lead screw 200; the second temperature sensor is located in the accommodating space, and is used to obtain the second temperature of the coolant in the cooling sleeve.

[0055] Specifically, the first temperature and the second temperature detected by the first temperature sensor and the second temperature sensor are compared with a preset temperature threshold. If the temperature detected by either or both exceeds the temperature threshold, the temperature controller 105 controls the liquid flow meter 104 to increase the coolant flow rate to enhance the heat dissipation effect.

[0056] This utility model provides a machine tool, which includes a ball screw pair cooling device with any of the above features.

[0057] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A ball screw assembly cooling device, characterized in that, include: Lead screw (200); Cooling nut assembly (100), the cooling nut assembly (100) is movably disposed on the side of the lead screw (200), and the two ends of the cooling nut assembly (100) are provided with cooling positions for accommodating coolant; Ball bearings are fitted between the lead screw (200) and the cooling nut assembly (100); When the cooling nut assembly (100) moves along the lead screw (200), the ball passes through the cooling position of the cooling nut assembly (100) to cool the ball.

2. The ball screw pair cooling device according to claim 1, characterized in that, The cooling nut assembly (100) includes a nut seat (101) and a cooling device; The nut seat (101) is movably disposed on the side of the lead screw (200); The cooling position is located at both ends of the nut seat (101), and the cooling device is fixedly installed at the cooling position; the nut seat (101) is provided with a raceway (108) on the side near the lead screw (200), the raceway (108) is used to pass the ball, and the raceway (108) is connected to the cooling device.

3. The ball screw pair cooling device according to claim 2, characterized in that, The cooling device includes a cooling sleeve; The cooling sleeve is fitted onto the outside of the nut seat (101); The cooling unit includes a space for accommodating the coolant.

4. The ball screw pair cooling device according to claim 3, characterized in that, The cooling sleeve assembly includes a first cooling sleeve (102) and a second cooling sleeve (103); One end of the nut seat (101) is defined as the first end, and the other end is defined as the second end; The first cooling sleeve (102) is fitted onto the first end; The second cooling sleeve (103) is fitted onto the second end.

5. The ball screw pair cooling device according to claim 4, characterized in that, The cooling device includes a first cooling inverter (106) and a second cooling inverter (107). The first cooling reverser (106) is located on the side of the first cooling sleeve (102) near the nut seat (101); The second cooling reverser (107) is located on the side of the second cooling sleeve (103) near the nut seat (101); The first cooling reverser (106), the second cooling reverser (107), and the raceway (108) cooperate with each other to form a closed loop, so that the ball enters the cooling sleeve and returns to the raceway (108) after cooling.

6. The ball screw pair cooling device according to claim 5, characterized in that, The first cooling reverser (106) includes a first bead inlet pipe section (1061) and a first bead return pipe section (1062). The second cooling reverser (107) includes a second inlet bead pipe section (1071) and a second return bead pipe section (1072). The first ball inlet pipe section (1061) and its corresponding connected raceway (108) are aligned in the same direction; the second ball inlet pipe section (1071) and its corresponding connected raceway (108) are aligned in the same direction; the first ball return pipe section (1062) and the second ball return pipe section (1072) are interconnected.

7. The ball screw pair cooling device according to claim 3, characterized in that, The cooling device also includes a liquid flow meter (104), which is installed in conjunction with the cooling sleeve to control the flow rate of the coolant.

8. The ball screw pair cooling device according to claim 7, characterized in that, The cooling device also includes a temperature controller (105) which is communicatively connected to the liquid flow meter (104) to control the temperature of the coolant.

9. The ball screw pair cooling device according to claim 8, characterized in that, The temperature controller (105) includes a first temperature sensor and a second temperature sensor; The first temperature sensor is located on the side of the nut seat (101) near the lead screw (200) to obtain the first temperature between the nut seat (101) and the lead screw (200); The second temperature sensor is located within the containment space and is used to obtain the second temperature of the coolant.

10. A machine tool, characterized in that, The machine tool includes the ball screw pair cooling device as described in any one of claims 1-9.

Images