Hollow cooling device for lead screw

Abstract

The utility model relates to a screw rod hollow cooling device which comprises a screw rod. A cooling liquid conveying channel of a hollow structure is formed in the middle of the lead screw. A front-end access hole and a tail-end access hole are respectively formed in the front end and the rear end of the screw rod; the front end of the screw rod is connected with a motor; the motor is fixedly arranged on the motor base; the motor base is provided with a first cooling liquid connector communicated with the front end inlet and outlet hole. A first bearing is arranged between the lead screw and the motor base; the rear end of the screw rod is connected with a tail end seat; the tail end seat is provided with a second cooling liquid connector communicated with the rear end inlet and outlet hole. And a second bearing is arranged between the screw rod and the tail end seat. The screw rod has the beneficial effects that the plurality of front-end inlet / outlet holes / tail-end inlet / outlet holes are formed in the circumferential direction of the screw rod, so that the flowing speed of cooling liquid can be increased by utilizing the centrifugal force generated when the screw rod rotates, and the cooling effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of screw rod, especially to a hollow cooling device of screw rod. BACKGROUND

[0002] In numerical control machining center, high-precision machine tool (such as numerical control grinding machine, precision lathe etc.), the precision of screw rod directly influences the precision of machining part. Through cooling device, the thermal deformation of screw rod can be effectively controlled, and high precision of screw rod can be ensured in long-time machining process. For example, in the screw rod transmission system of grinding machine, when high-precision surface grinding or cylindrical grinding is carried out, the tiny thermal deformation of screw rod can cause the grinding precision to drop. Using cooling device can control the temperature of screw rod in proper range, and make the grinding precision reach micron or even sub-micron level. In high-speed cutting machine tool, the rotating speed of screw rod is very high, and the heat generated is also more. Cooling device can take away the heat generated by screw rod in time, and prevent the problems such as aggravation of wear and tear and reduction of precision of screw rod due to overheating. For example, when high-speed milling is carried out in machining center, the rotating speed of screw rod can reach thousands of revolutions per minute, at this time, the screw rod cooling device can effectively reduce the temperature of screw rod, prolong the service life of screw rod, and ensure the precision and efficiency of cutting process.

[0003] Screw rod is usually slender structure, and in the cooling process, the temperature of two ends and middle part is not uniform. The cooling of screw rod in circumferential direction can also be non-uniform. Especially for some screw rods with complex shape or spiral groove, the flow mode of cooling liquid on the surface of screw rod can be affected by these structures. SUMMARY

[0004] In order to solve the above problems of prior art, the utility model provides a hollow cooling device of screw rod.

[0005] In order to achieve the above purpose, the utility model adopts the following main technical scheme:

[0006] A hollow cooling device of screw rod, comprising a screw rod; a hollow structure cooling liquid conveying channel is formed in the middle part of the screw rod; front and rear ends of the screw rod are respectively provided with front end inlet and outlet holes and tail end inlet and outlet holes; the front end of the screw rod is connected with a motor; the motor is fixedly arranged on a motor base; the motor base is provided with a cooling liquid interface one in communication with the front end inlet and outlet holes; a first bearing is arranged between the screw rod and the motor base; the rear end of the screw rod is connected with a tail end base; the tail end base is provided with a cooling liquid interface two in communication with the rear end inlet and outlet holes; a second bearing is arranged between the screw rod and the tail end base.

[0007] Further, the motor is connected with the screw rod through a shaft coupling; a motor cooling jacket is arranged on the end surface of the motor close to the screw rod; a cooling liquid conveying channel is formed between the outside of the motor cooling jacket and the inner wall of the motor base.

[0008] Further, the lead screw is closed at both ends; the front end access holes are arranged on the circumference of the lead screw; the front end access holes are sleeved with front end isolation sleeves; the front end isolation sleeves are provided with front end oil seals on both sides; the front end isolation sleeves are provided with through holes communicated with the cooling liquid interface I; the cooling liquid interface I is connected with an output pipe.

[0009] Further, the first bearing is arranged in the bearing cooling jacket; the bearing cooling jacket is formed with a cooling groove outside; the cooling groove and the inner wall of the motor base form a cooling liquid conveying channel.

[0010] Further, the motor base is provided with a motor base gland at the end away from the motor; the motor base gland and the lead screw are provided with a motor base dustproof ring; the motor base dustproof ring is provided with a pad plate fixedly connected with the motor base gland outside; the pad plate and the motor base dustproof ring are provided with a buffer pad.

[0011] Further, the lead screw is closed at both ends; the tail end access holes are arranged on the circumference of the lead screw; the tail end access holes are sleeved with tail end isolation sleeves; the tail end isolation sleeves are provided with tail end oil seals on both sides; the tail end isolation sleeves are provided with through holes communicated with the cooling liquid interface II; the cooling liquid interface II is connected with an input pipe.

[0012] Further, the second bearing is arranged in the tail end bearing cooling jacket; the tail end bearing cooling jacket is formed with a cooling groove outside; the cooling groove and the inner wall of the tail end base form a cooling liquid conveying channel.

[0013] Further, the tail end base is provided with a tail end base gland at the end close to the motor; the tail end base gland and the lead screw are provided with a tail end base dustproof ring; the tail end base dustproof ring is provided with a pad plate fixedly connected with the tail end base gland outside; the pad plate and the tail end base dustproof ring are provided with a buffer pad; the tail end base is sealed with a tail end base rear cover at the end away from the motor.

[0014] Further, the lead screw is connected with a lead screw sleeve.

[0015] The beneficial effects of the utility model are: a plurality of front end access holes / tail end access holes are arranged on the circumference of the lead screw, the centrifugal force during rotation of the lead screw can be utilized to accelerate the flow speed of the cooling liquid, so that the cooling effect is improved; the cooling groove can be arranged as an annular groove, so that the cooling liquid travels in a spiral form along the outside of the bearing cooling jacket, the length of the cooling liquid channel is increased, the contact time with the bearing cooling jacket is increased, and the cooling effect is improved; the cooling groove can also be arranged as a return type flow channel, which can also increase the length of the cooling liquid channel; the layout of the return type flow channel is relatively flexible, compared with the regular annular groove, it can be adjusted according to the actual installation space and equipment structure around the bearing. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 is the structural explosion diagram of the present application;

[0018] Figure 2 is the structural perspective view of the present application;

[0019] Figure 3 is the sectional view of the present application;

[0020] Figure 4 is the schematic view of the bearing cooling jacket structure of the present application;

[0021] Mark explanation:

[0022] 100, lead screw; 101, pad plate; 102, cushion pad; 110, front end access hole; 120, tail end access hole; 130, lead screw sleeve; 200, motor; 210, motor base; 211, cooling liquid interface one; 212, output pipe; 220, first bearing; 230, shaft coupling; 240, motor cooling jacket; 250, front end spacer sleeve; 251, front end oil seal; 260, bearing cooling jacket; 261, cooling groove; 270, motor base gland; 280, motor base dust ring; 300, tail end seat; 310, cooling liquid interface two; 311, input pipe; 312, straight-through joint; 320, second bearing; 330, tail end spacer sleeve; 340, tail end oil seal; 350, tail end bearing cooling jacket; 360, tail end seat gland; 370, tail end seat dust ring; 380, tail end seat rear cover; 400, cooling liquid conveying channel. Specific implementation

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0024] In the description of the present application, it should be noted that the positions or location relationships indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like are based on the positions or location relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the devices or elements indicated to have a specific position, to be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] Embodiments, such as Figures 1-4

[0027] ​A hollow cooling device for screw rod, comprising a screw rod 100; a hollow cooling liquid delivery channel 400 is formed in the middle of the screw rod 100; a front end inlet and outlet hole 110 and a rear end inlet and outlet hole are respectively arranged at the front end and the rear end of the screw rod 100; the problem of uneven circumferential cooling of the screw rod 100 can be effectively solved by the hollow screw rod 100, and effective cooling of the middle of the screw rod 100 can be ensured; the front end of the screw rod 100 is connected with a motor 200; the motor 200 is fixedly arranged on a motor base 210; a cooling liquid interface I 211 is arranged on the motor base 210 and communicates with the front end inlet and outlet hole 110; the cooling liquid interface I 211 is connected with the screw rod 100 through a cooling liquid delivery channel 400 formed in the motor base 210, and the motor 200 can be cooled at the same time, and the cooling effect is improved; a first bearing 220 is arranged between the screw rod 100 and the motor base 210; a tail end base 300 is connected to the rear end of the screw rod 100; a cooling liquid interface II 310 is arranged on the tail end base 300 and communicates with the rear end inlet and outlet hole; a second bearing 320 is arranged between the screw rod 100 and the tail end base 300; the cooling liquid interface II 310 is connected with the screw rod 100 through a cooling liquid delivery channel 400 formed in the tail end base 300, and effective cooling of the tail end of the screw rod 100 is ensured; Figure 1 The midpoint-like shadow is the cooling liquid delivery channel 400;

[0028] In an embodiment, the motor 200 is connected with the screw rod 100 through a shaft coupling 230; a motor cooling sleeve 240 is arranged on the end face of the motor 200 close to the screw rod 100; a cooling liquid delivery channel 400 is formed between the outside of the motor cooling sleeve 240 and the inner wall of the motor base 210; by arranging the motor cooling sleeve 240, the size of the cooling liquid delivery channel 400 for cooling the motor 200 can be reasonably controlled, and the temperature of the cooling liquid can be prevented from rising too early when the screw rod 100 is not effectively cooled, so that the cooling of the screw rod 100 is preferentially ensured;

[0029] In an embodiment, the lead screw 100 is closed at both ends; the front end access hole 110 is arranged on the circumference of the lead screw 100; a plurality of front end access holes 110 are arranged on the circumference of the lead screw 100; by arranging a plurality of front end access holes 110 on the circumference of the lead screw 100, the flow speed of the cooling liquid can be accelerated by the centrifugal force when the lead screw 100 rotates, thereby improving the cooling effect; the front end access hole 110 is sleeved with a front end spacer sleeve 250; the front end spacer sleeve 250 is provided with front end oil seals 251 on both sides; the front end spacer sleeve 250 is provided with a through hole communicated with the cooling liquid interface 211; the cooling liquid interface 211 is connected with an output pipe 212; the front end spacer sleeve 250 cooperates with the front end access hole 110 to form a plurality of cooling liquid access channels, which facilitates the uniform outward diffusion of the cooling liquid, realizes sealing by the front end oil seals 251 on both sides, reasonably plans the size of the cooling liquid delivery channel 400, and reduces the cooling of unnecessary areas;

[0030] In an embodiment, the first bearing 220 is arranged in the bearing cooling sleeve 260; the bearing cooling sleeve 260 is formed with a cooling groove 261 outside; the cooling groove 261 and the inner wall of the motor base 210 form a cooling liquid delivery channel 400; in an embodiment, the cooling groove 261 can be arranged as an annular groove, so that the cooling liquid travels in a spiral form along the outside of the bearing cooling sleeve 260, increases the length of the cooling liquid channel, increases the contact time with the bearing cooling sleeve, and improves the cooling effect; when the cooling liquid travels in a spiral form along the outside of the bearing cooling sleeve 260, due to the unique annular groove design, the cooling liquid can continuously and relatively slowly flow around the bearing cooling sleeve 260. Compared with the traditional straight channel cooling method, this spiral flow greatly prolongs the contact time of the cooling liquid with the cooling sleeve. Taking a high-speed rotating industrial bearing as an example, its rotational speed can reach thousands of revolutions per minute or even higher during operation. If the heat generated cannot be dissipated in time, it will accumulate rapidly and cause the bearing to overheat and fail. The annular groove causes the cooling liquid to flow like a tightly wound "cooling ribbon", which surrounds the cooling sleeve in all directions and multiple levels, continuously conducts heat from the bearing, and ensures that the bearing is always in an appropriate working temperature range, effectively prolonging the service life of the bearing. The spiral cooling liquid flow channel of the annular groove also helps to achieve uniform distribution of the surface temperature of the bearing cooling sleeve 260. Since the cooling liquid flows uniformly and continuously along the annular path, there is no local cooling liquid flow speed that is too fast or too slow, so that each part of the cooling sleeve can be evenly cooled. While ensuring excellent cooling effect, the annular groove structure prolongs the effective utilization path of the cooling liquid, relatively reduces the need for a large amount of cooling liquid to flow in and out in a short time, and reduces the amount of cooling liquid used;

[0031] As Figure 4As shown, in an embodiment, the cooling groove 261 can be arranged as a folded-back flow channel, which can also increase the length of the cooling liquid passage; the layout of the folded-back flow channel is relatively flexible, and compared with a regular annular groove, it can be adjusted according to the actual installation space of the bearing periphery and the equipment structure.

[0032] In an embodiment, the cooling liquid passage outside the bearing cooling sleeve 260 in the embodiment is connected with the cooling liquid passage formed on the front end spacer sleeve 250;

[0033] In an embodiment, the motor base 210 is provided with a motor base gland 270 at the end away from the motor 200; the motor base gland 270 is provided with a motor base dustproof ring 280 between the motor base gland 270 and the lead screw 100; the motor base dustproof ring 280 is provided with a pad plate 101 fixedly connected with the motor base gland 270 outside the motor base dustproof ring 280; the pad plate 101 is provided with a buffer pad 102 between the pad plate 101 and the motor base dustproof ring 280.

[0034] In an embodiment, the lead screw 100 is closed at both ends; the tail end access hole 120 is arranged in the circumferential direction of the lead screw 100; the tail end spacer sleeve 330 is sleeved on the tail end access hole 120; the tail end oil seal 340 is arranged on both sides of the tail end spacer sleeve 330; the through hole connected with the cooling liquid interface two 310 is arranged on the tail end spacer sleeve 330; the input pipe 311 is connected with the cooling liquid interface two 310. By arranging a plurality of tail end access holes 120 in the circumferential direction of the lead screw 100, the flow speed of the cooling liquid can be accelerated by the centrifugal force when the lead screw 100 rotates, so as to improve the cooling effect; the tail end spacer sleeve 330 cooperates with the tail end access hole 120 to form a plurality of cooling liquid access passages, which facilitates the uniform outward diffusion of the cooling liquid, realizes sealing by the tail end oil seals 340 on both sides, reasonably plans the size of the cooling liquid delivery passage 400, and reduces cooling of unnecessary areas;

[0035] In an embodiment, the second bearing 320 is arranged in the tail end bearing cooling sleeve 350; the cooling groove 261 is formed outside the tail end bearing cooling sleeve 350; the cooling liquid delivery passage 400 is formed between the cooling groove 261 and the inner wall of the tail end base 300;

[0036] In an embodiment, the tail end base 300 is provided with a tail end base gland 360 at the end close to the motor 200; the tail end base gland 360 is provided with a tail end base dustproof ring 370 between the tail end base gland 360 and the lead screw 100; the tail end base dustproof ring 370 is provided with a pad plate 101 fixedly connected with the tail end base gland 360 outside the tail end base dustproof ring 370; the pad plate 101 is provided with a buffer pad 102 between the pad plate 101 and the tail end base dustproof ring 370; the tail end base 300 is sealed by the tail end base rear cover 380 at the end away from the motor 200.

[0037] In an embodiment, the lead screw 100 is connected with the lead screw sleeve 130.

[0038] In an embodiment, the front end oil seal 251 and the tail end oil seal 340 are stainless steel oil seals.

[0039] In an embodiment, the cooling liquid is water, or coolant, or oil.

[0040] In an embodiment, the input pipe 311 is a copper pipe; the input pipe 311 is connected with the cooling liquid interface 310 through a straight-through joint 312; and the output pipe 212 is a copper pipe.

[0041] The above description is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent transformation or direct or indirect application in the related technical field by using the content of the present application specification and drawings is also included in the patent protection range of the present application.

Claims

1. A hollow cooling device for a lead screw, characterized by: The utility model provides a kind of motor cooling system, including screw rod (100);The middle part of the screw rod (100) is formed with the cooling liquid delivery channel (400) of hollow structure;The front and rear ends of the screw rod (100) are equipped with front end inlet and outlet hole (110) and tail end inlet and outlet hole (120) respectively;The front end of the screw rod (100) is connected with motor (200);The motor (200) is fixedly arranged on motor base (210);Motor base (210) is equipped with cooling liquid interface one (211) being communicated with front end inlet and outlet hole (110);First bearing (220) is equipped between the screw rod (100) and motor base (210);The rear end of the screw rod (100) is connected with tail end seat (300);Tail end seat (300) is equipped with cooling liquid interface two (310) being communicated with rear end inlet and outlet hole;Second bearing (320) is equipped between the screw rod (100) and tail end seat (300).

2. The hollow cooling device of claim 1, wherein: The motor (200) is connected with the screw rod (100) by coupling (230) and is rotationally connected;The end face of the motor (200) close to the screw rod (100) is equipped with motor cooling jacket (240);The outer side of the motor cooling jacket (240) and the inner wall of the motor base (210) form the cooling liquid delivery channel (400).

3. The hollow cooling device of claim 1, wherein: The both ends of the screw rod (100) are closed;The front end inlet and outlet hole (110) is arranged in the circumferential direction of the screw rod (100);The front end inlet and outlet hole (110) is sleeved with front end spacer sleeve (250);The front and rear sides of the front end spacer sleeve (250) are both equipped with front end oil seal (251);The front end spacer sleeve (250) is equipped with through hole being communicated with the cooling liquid interface one (211);The cooling liquid interface one (211) is connected with output pipe (212).

4. The hollow cooling device of claim 1, wherein: The first bearing (220) is arranged in bearing cooling jacket (260);Cooling groove (261) is formed outside the bearing cooling jacket (260);The cooling liquid delivery channel (400) is formed between the cooling groove (261) and the inner wall of the motor base (210).

5. The hollow cooling device of claim 1, wherein: The end of the motor base (210) away from the motor (200) is equipped with motor base gland (270);The motor base gland (270) and the screw rod (100) are equipped with motor base dust ring (280);The motor base dust ring (280) is equipped with gasket (101) being fixedly connected with the motor base gland (270) outside;The gasket (101) and the motor base dust ring (280) are equipped with buffer pad (102) therebetween.

6. The hollow cooling device of claim 1, wherein: The both ends of the screw rod (100) are closed;The tail end inlet and outlet hole (120) is arranged in the circumferential direction of the screw rod (100);The tail end inlet and outlet hole (120) is sleeved with tail end spacer sleeve (330);The tail end spacer sleeve (330) is equipped with tail end oil seal (340) on the front and rear sides;The tail end spacer sleeve (330) is equipped with through hole being communicated with the cooling liquid interface two (310);The cooling liquid interface two (310) is connected with input pipe (311).

7. The hollow cooling device of claim 1, wherein: The second bearing (320) is arranged in a tail end bearing cooling jacket (350); a cooling groove (261) is formed outside the tail end bearing cooling jacket (350); and a cooling liquid conveying channel (400) is formed between the cooling groove (261) and the inner wall of the tail end seat (300).

8. The hollow cooling device of claim 1, wherein: The tail end seat (300) is provided with a tail end seat gland (360) at one end close to the motor (200); a tail end seat dustproof ring (370) is arranged between the tail end seat gland (360) and the lead screw (100); a gasket (101) fixedly connected with the tail end seat gland (360) is arranged outside the tail end seat dustproof ring (370); a buffer pad (102) is arranged between the gasket (101) and the tail end seat dustproof ring (370); and the tail end seat (300) is sealed with a tail end seat back cover (380) at one end away from the motor (200).

9. The hollow cooling device of claim 1, wherein: The lead screw (100) is connected with a lead screw sleeve (130).

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