Water circulation cooling type ball screw

Abstract

The utility model discloses a water circulation cooling type ball screw, belongs to the technical field of ball screws, and solves the problem that the contact surface of a load ball and the ball screw is easy to heat in the working process of the ball screw. The device specifically comprises a lead screw and a nut, and the nut is movably connected to the lead screw. A load ball is arranged between the lead screw and the nut and is arranged in a ball groove of the lead screw; the two ends of the lead screw are movably connected with two rotating joints correspondingly. A cooling water pipe is wound on the lead screw, and the two ends of the cooling water pipe are connected with the two rotary joints respectively; in the utility model, cooling water flows into the cooling water pipe from the rotary joint at one end of the lead screw and then flows out from the rotary joint at the other end of the lead screw; the cooling water exchanges heat with the lead screw when flowing through the cooling water pipe to take away heat generated after friction between the lead screw and the load ball, so that the thermal expansion characteristic caused by friction of the lead screw is improved and cooled, and the influence of thermal deformation on the transmission precision of the lead screw is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of ball screws, in particular to a water circulation cooling type ball screw. Background Art

[0002] Ball screw is an important transmission device. It is widely used in various mechanical equipments, such as CNC machine tools, precision machine tools, industrial robots, electronic machinery, conveying machinery, aerospace industry, etc., because of its advantages of high load capacity and high precision. The main working principle of ball screw is to use the load ball to roll in the ball groove on the surface of the screw to drive the nut on the screw to move along the direction of the screw, and then convert the rotational motion into linear motion; the load ball can greatly reduce the friction between the nut and the screw during the operation of the ball screw, and reduce the power consumption; however, the contact area between the load ball and the screw or nut is easy to generate heat during the rolling of the load ball, and the screw will produce micro deformation after heating, which will affect the normal rolling of the load ball. Especially for precision ball screws, as the use time increases, the thermal expansion phenomenon after the ball generates heat may affect its transmission accuracy and stability, and then affect the working performance of the entire mechanical equipment. Therefore, it is of great significance to study a ball screw with cooling function. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a water-circulating cooling ball screw, which solves the problem that the contact surface between the load ball and the screw is prone to heat up during the operation of the ball screw.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A water circulation cooling ball screw comprises a screw and a nut, wherein the screw is movably connected with the nut; a load ball is arranged between the screw and the nut, and the load ball is arranged in a ball groove of the screw; two ends of the screw are movably connected with two rotating joints; a cooling water pipe is wound around the screw, and the two ends of the cooling water pipe are respectively connected with the two rotating joints.

[0006] In this solution, cooling water flows into the cooling water pipe from the rotary joint at one end of the screw, and then flows out from the rotary joint at the other end of the screw; when the cooling water flows through the cooling water pipe, it exchanges heat with the screw, taking away the heat generated by the friction between the screw and the load ball, thereby improving and cooling the thermal expansion characteristics caused by the friction of the screw, so as to prevent thermal deformation from affecting the transmission accuracy of the screw.

[0007] Furthermore, a pipe laying groove is opened at the bottom of the ball groove of the screw along the spiral direction of the ball groove, and a cooling water pipe is laid in the pipe laying groove; water injection holes are opened at both ends of the screw along the length direction of the screw, and the water injection holes are connected to the pipe laying groove; both ends of the cooling water pipe are respectively inserted into the two water injection holes at both ends of the screw.

[0008] In this solution, the cooling water pipe is laid in the pipe laying groove at the bottom of the ball groove. This position is relatively close to the friction surface of the lead screw, enabling maximum efficiency of heat exchange with the lead screw. Moreover, the load balls roll in the ball groove, and the cooling water pipe is at the bottom of the load balls, which will not affect the movement of the load balls.

[0009] Furthermore, the end of the lead screw is movably connected within the bearing block of the rotary joint; a water storage cavity is provided between the bearing block and the lead screw, and the water injection hole communicates with the water storage cavity; a pipe joint is provided at one end of the water storage cavity away from the lead screw.

[0010] In this solution, the cooling water enters the water storage cavity at the end of the lead screw through the pipe joint. During the rotation of the lead screw, the water injection hole always communicates with the water storage cavity. The cooling water inside the water storage cavity enters the water injection hole and then flows into the cooling water pipe from the water injection hole to conduct heat exchange with the lead screw. This design can ensure that the cooling water can still flow into the cooling water pipe during the rotation of the lead screw, providing guarantee for the continuous cooling of the lead screw during operation.

[0011] Furthermore, an angular contact ball bearing is provided between the lead screw and the inner wall of the bearing block; a bearing cover is connected to the side of the bearing block close to the lead screw by bolts, and the bottom of the bearing cover is clamped on the limit platform at the end of the lead screw.

[0012] Furthermore, a labyrinth seal ring is provided between the lead screw and the bearing block.

[0013] Furthermore, a drive platform is provided at the end of the lead screw, and a pulley is key-connected to the drive platform; the keyway is arranged on the side of the lead screw away from the water injection hole.

[0014] In this solution, the pulley is used to drive the rotation of the lead screw, and the keyway is arranged on the side of the lead screw away from the water injection hole, avoiding opening the water injection hole and the keyway on the same side of the lead screw and thus affecting its strength.

[0015] Furthermore, two pipe fixing rings are respectively sleeved at both ends of the lead screw; convex rings identical to the spiral track of the ball groove on the lead screw are provided on the inner wall of the pipe fixing ring, and the convex rings are embedded into the ball groove to fix the cooling water pipe.

[0016] In this solution, the two pipe fixing rings are clamped at both ends of the lead screw, preventing the cooling water pipe from popping out of the water injection hole and ensuring the stability of the cooling water pipe inside the pipe laying groove.

[0017] Furthermore, the pipe fixing ring includes two semi-circular rings, a flange edge is provided at the connection of the two semi-circular rings, and the two semi-circular rings are connected by bolts passing through the flange edge.

[0018] The beneficial effects of the present utility model are:

[0019] When the water - circulation cooling type ball screw provided by the utility model works, the load balls roll inside the ball grooves, driving the nut to move along the screw. Meanwhile, heat is generated due to the friction between the load balls and the screw. Cooling water flows inside the cooling water pipe, exchanges heat with the screw, and takes away the heat generated by the friction between the screw and the load balls, avoiding the problem of local heat - induced expansion caused by the heat generated by the friction of the load balls, solving problems such as insufficient positioning accuracy caused by the decline of the screw drive accuracy, and ensuring the stability and reliability of the ball screw operation. Brief Description of the Drawings

[0020] Figure 1 It is a schematic cross - sectional structure diagram of a water - circulation cooling type ball screw of the present utility model;

[0021] Figure 2 It is a schematic cross - sectional structure diagram of a rotary joint of the present utility model;

[0022] Figure 3 It is a schematic external structure diagram of a rotary joint of the present utility model.

[0023] Reference Signs:

[0024] 1. Screw; 11. Water injection hole; 12. Limiting platform; 13. Driving platform; 14. Keyway; 2. Nut; 21. Load ball; 3. Cooling water pipe; 4. Pipe joint; 5. Rotary joint; 51. Angular contact ball bearing; 52. Bearing cover; 53. Water storage cavity; 54. Labyrinth seal ring; 55. Bearing seat; 6. Pipe fixing ring; 61. Convex ring Detailed Embodiments

[0025] The following further describes the present utility model with reference to the drawings and specific embodiments. The following describes the specific embodiments of the present utility model to facilitate the understanding of those skilled in the art of this technical field. However, it should be clear that the present utility model is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of this technical field, as long as various changes are within the spirit and scope of the present utility model defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present utility model are within the scope of protection.

[0026] As Figure 1 shown, this embodiment provides a water - circulation cooling type ball screw. When this water - circulation cooling type ball screw works, it is cooled by circulating cooling water to prevent the contact surface between the load ball 21 and the screw 1 from overheating severely, resulting in the heat - induced deformation of the screw and thus affecting its positioning accuracy. Specifically, it includes:

[0027] Screw 1, nut 2, cooling water pipe 3 and rotary joint 5;

[0028] Among them, a nut 2 is movably connected to a lead screw 1; a load ball 21 is provided between the lead screw 1 and the nut 2, and the load ball 21 is arranged in the ball groove of the lead screw 1; during operation, the load ball 21 rolls inside the ball groove, driving the nut 2 to move along the lead screw 1; two rotary joints 5 are respectively movably connected to both ends of the lead screw 1; a cooling water pipe 3 is wound around the lead screw 1, and both ends of the cooling water pipe 3 are respectively connected to the two rotary joints 5; cooling water flows into the cooling water pipe 3 from the rotary joint 5 at one end of the lead screw 1 and then flows out from the rotary joint 5 at the other end of the lead screw 1; when the cooling water flows through the cooling water pipe 3, it exchanges heat with the lead screw 1, taking away the heat generated by the friction between the lead screw 1 and the load ball 21.

[0029] As Figure 2 shown, a pipe laying groove is opened along the spiral direction of the ball groove at the bottom of the ball groove of the lead screw 1, and the cooling water pipe 3 is laid in the pipe laying groove; water injection holes 11 are opened at both ends of the lead screw 1 along the length direction of the lead screw 1, and the water injection holes 11 communicate with the pipe laying groove; both ends of the cooling water pipe 3 are respectively inserted into the two water injection holes 11 at both ends of the lead screw 1; the cooling water pipe 3 is laid in the pipe laying groove at the bottom of the ball groove, and this position is relatively close to the friction surface of the lead screw 1, enabling the most efficient heat exchange with the lead screw 1; moreover, the load ball 21 rolls in the ball groove, and the cooling water pipe 3 is at the bottom of the load ball 21, which will not affect the movement of the load ball 21.

[0030] The end of the lead screw 1 is movably connected inside the bearing seat 55 of the rotary joint 5; a water storage cavity 53 is provided between the bearing seat 55 and the lead screw 1, and the water injection hole 11 communicates with the water storage cavity 53; a pipe joint 4 is provided at one end of the water storage cavity 53 away from the lead screw 1; cooling water enters the water storage cavity 53 at the end of the lead screw 1 through the pipe joint 4. During the rotation of the lead screw 1, the water injection hole 11 always communicates with the water storage cavity 53, and the cooling water inside the water storage cavity 53 enters the water injection hole 11 and then flows into the cooling water pipe 3 from the water injection hole 11 to exchange heat with the lead screw 1; this design can ensure that the cooling water can still flow into the cooling water pipe 3 during the rotation of the lead screw 1, providing a guarantee for the continuous cooling of the lead screw 1 during operation.

[0031] An angular contact ball bearing 51 is provided between the lead screw 1 and the inner wall of the bearing seat 55; a bearing cover 52 is bolted to one side of the bearing seat 55 close to the lead screw 1, and the bottom of the bearing cover 52 is clamped on the limiting platform 12 at the end of the lead screw 1.

[0032] As Figure 3 shown, in this embodiment, both the bearing seat 55 and the bearing cover 52 are designed as upper and lower split types; the upper and lower parts are bolted together.

[0033] A labyrinth seal ring 54 is provided between the lead screw 1 and the bearing seat 55.

[0034] A driving platform 13 is provided at one end of the lead screw 1, and a pulley is key-connected to the driving platform 13; a keyway 14 is provided on one side of the lead screw 1 away from the water injection hole 11; the pulley is used to drive the lead screw 1 to rotate, and the keyway 14 is provided on one side of the lead screw 1 away from the water injection hole 11 to avoid opening the water injection hole 11 and the keyway 14 on the same side of the lead screw 1, thereby affecting its strength; two pipe fixing rings 6 are respectively sleeved at both ends of the lead screw 1; a convex ring 61 with the same spiral track as the ball groove on the lead screw 1 is provided on the inner wall of the pipe fixing ring 6, and the convex ring 61 is embedded in the ball groove to fix the cooling water pipe 3.

[0035] The two pipe fixing rings 6 are clamped at both ends of the lead screw 1 to prevent the cooling water pipe 3 from popping out of the water injection hole 11 and ensure the stability of the cooling water pipe 3 inside the pipe laying groove; the pipe fixing ring 6 includes two semi-circular rings, a flange edge is provided at the connection of the two semi-circular rings, and the two semi-circular rings are connected by bolts passing through the flange edge.

[0036] The working principle of this embodiment is as follows:

[0037] When the water circulation cooling type ball screw provided by the present utility model works, cooling water enters the water storage cavity 53 at the end of the lead screw 1 from the pipe joint 4 at one end of the lead screw 1, enters the water injection hole 11 from the water storage cavity 53, and then flows into the cooling water pipe 3 from the water injection hole 11 to exchange heat with the lead screw 1; finally, it flows out from the pipe joint 4 at the other end of the lead screw 1, taking away the heat generated by the friction between the lead screw 1 and the load ball 21.

[0038] Those of ordinary skill in the art will realize that the embodiments here are to help readers understand the principle of the present utility model, and it should be understood that the protection scope of the present utility model is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific deformations and combinations that do not depart from the essence of the present utility model according to these technical revelations disclosed by the present utility model, and these deformations and combinations are still within the protection scope of the utility model.

Claims

1. A water circulation cooling ball screw, characterized in that: The invention comprises a lead screw (1) and a nut (2), wherein the lead screw (1) is movably connected to the nut (2); a load ball (21) is provided between the lead screw (1) and the nut (2), and the load ball (21) is arranged in a ball groove of the lead screw (1); two rotating joints (5) are movably connected to the two ends of the lead screw (1); a cooling water pipe (3) is wound around the lead screw (1), and the two ends of the cooling water pipe (3) are respectively connected to the two rotating joints (5).

2. The water circulation cooling ball screw according to claim 1 is characterized in that: A pipe laying groove is provided at the bottom of the ball groove of the screw (1) along the spiral direction of the ball groove, and a cooling water pipe (3) is laid in the pipe laying groove; water injection holes (11) are provided at both ends of the screw (1) along the length direction of the screw (1), and the water injection holes (11) are connected to the pipe laying groove; and the two ends of the cooling water pipe (3) are respectively inserted into the two water injection holes (11) at the two ends of the screw (1).

3. The water circulation cooling ball screw according to claim 2 is characterized in that: The end of the lead screw (1) is movably connected to the bearing seat (55) of the rotary joint (5); a water storage chamber (53) is provided between the bearing seat (55) and the lead screw (1), and the water injection hole (11) is connected to the water storage chamber (53); a pipe joint (4) is provided at one end of the water storage chamber (53) away from the lead screw (1).

4. The water circulation cooling ball screw according to claim 3 is characterized in that: An angular contact ball bearing (51) is provided between the lead screw (1) and the inner wall of the bearing seat (55); a bearing cover (52) is connected to the side of the bearing seat (55) close to the lead screw (1) by bolts, and the bottom of the bearing cover (52) is clamped on the limit platform (12) at the end of the lead screw (1).

5. The water circulation cooling ball screw according to claim 3 is characterized in that: A labyrinth seal ring (54) is provided between the lead screw (1) and the bearing seat (55).

6. The water circulation cooling ball screw according to claim 3 is characterized in that: A driving platform (13) is provided at the end of the lead screw (1), and a pulley is keyed on the driving platform (13); a keyway (14) is provided on a side of the lead screw (1) away from the water injection hole (11).

7. The water circulation cooling ball screw according to claim 2, characterized in that: Two pipe fixing rings (6) are respectively sleeved at both ends of the lead screw (1); the inner wall of the pipe fixing ring (6) is provided with a convex ring (61) having the same spiral track as the ball groove on the lead screw (1); the convex ring (61) is embedded in the ball groove to fix the cooling water pipe (3).

8. The water circulation cooling ball screw according to claim 7, characterized in that: The pipeline fixing ring (6) comprises two semicircular rings, a flange is provided at the connection between the two semicircular rings, and the two semicircular rings are connected by bolts penetrating the flanges.

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