Leakage-proof structure of vertically-arranged hollow cooling lead screw

Abstract

The utility model discloses a leakage-proof structure of a vertically-arranged hollow cooling lead screw, which comprises an inlet leakage-proof unit and an outlet leakage-proof unit, the inlet leakage-proof unit comprises an inlet joint, a cooling sleeve, a first pressure oil seal, a first spacer bush, a first O-shaped sealing ring and a first elastic check ring, and the first pressure oil seal, the first spacer bush, the first O-shaped sealing ring and the first elastic check ring are arranged on the inner side of the cooling sleeve; the outlet leakage-proof unit comprises an outlet connector, a sealing sleeve, a second pressure oil seal arranged on the inner side of the sealing sleeve, a second spacer bush, a second O-shaped sealing ring, a second elastic check ring and a cover plate. According to the leakage-proof structure, the first spacer bush is additionally arranged between the lead screw and the first pressure oil seal, the second spacer bush is additionally arranged between the lead screw and the second pressure oil seal, the first spacer bush and the second spacer bush replace the lead screw to make long-time friction contact with the first pressure oil seal and the second pressure oil seal, the structure is stable and reliable, the service life is long, abrasion of the lead screw can be avoided, and the service life is prolonged. And a first O-shaped sealing ring and a second O-shaped sealing ring are matched, so that leakage of cooling liquid can be avoided, and the cooling effect and the transmission precision of the lead screw are guaranteed.

Description

Technical Field

[0001] The utility model relates to a leakage-proof structure in the field of high-speed machining center transmission, in particular to a leakage-proof structure of a vertically arranged hollow cooling lead screw. Background Art

[0002] In the field of CNC machine tool transmission, in order to improve the efficiency of the machine tool, the motor speed is usually increased to speed up the rapid movement of the three axes (i.e., X-axis, Y-axis, and Z-axis). The resulting problem is that the temperature change of the screw-type transmission structure is too large, resulting in reduced machine tool accuracy. In order to solve this problem, a hollow screw structure is generally introduced, and the coolant circulates inside the screw to take away the heat generated by the screw movement, thereby ensuring that its transmission accuracy is not affected. However, since the screw rotates during work, it makes it difficult to seal and leak-proof the coolant inlet and outlet.

[0003] The existing hollow screw anti-leakage structure often configures sealing rings at both ends of the screw to achieve a sealing effect. However, the direct friction between the sealing ring and the screw will seriously affect the life of the screw, and the installation position of the sealing ring is too deep into the motor seat, which is very easy to damage the sealing ring during actual installation. At the same time, it is easy to cause water leakage due to improper installation of the sealing ring. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a leak-proof structure of a vertically arranged hollow cooling screw in view of the deficiencies in the prior art, which can avoid wear of the screw and leakage of coolant and ensure the cooling effect and transmission accuracy of the screw.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: a leak-proof structure of a vertically arranged hollow cooling screw, wherein the lower and upper parts of the screw are respectively installed with a lower bearing and an upper bearing, the lower bearing is installed on the tail end seat, the upper bearing is installed on the front end seat and is pressed by a bearing pressure plate, the top end of the screw is connected to the output shaft of the motor through a coupling, the motor is installed on the motor seat, the leak-proof structure comprises an inlet leak-proof unit arranged on the lower side of the lower bearing and an outlet leak-proof unit arranged on the upper side of the upper bearing, the inlet leak-proof unit comprises an inlet joint, a cooling sleeve and a cooling sleeve arranged on the cooling sleeve The first pressure oil seal, the first spacer, the first O-ring and the first elastic retaining ring on the inner side, the cooling sleeve is fixed on the lower side of the tail end seat, the cooling sleeve is arranged on the outer side of the bottom end of the screw, the inlet joint is installed on the bottom end of the cooling sleeve, the inlet joint is communicated with the inner cavity of the screw, the first spacer is arranged on the outer side of the bottom end of the screw with a clearance fit, the first O-ring is arranged between the screw and the first spacer, the first pressure oil seal is arranged between the cooling sleeve and the first spacer, and the top of the first pressure oil seal is formed by the The first elastic retaining ring is pressed tightly, the first elastic retaining ring is installed on the inner wall of the cooling sleeve, the outlet leakage prevention unit includes an outlet joint, a sealing sleeve and a second pressure oil seal, a second spacer, a second O-ring, a second elastic retaining ring and a cover plate arranged on the inner side of the sealing sleeve, the sealing sleeve is fixed to the upper side of the bearing pressure plate by screws, the sealing sleeve is arranged on the outer side of the upper end of the lead screw, the second spacer is arranged on the outer side of the upper end of the lead screw with a clearance fit, the second O-ring is arranged between the lead screw and the second spacer, and the second spacer and the sealing sleeve are arranged between the second spacer and the sealing sleeve Two second pressure oil seals are arranged above and below, the top of the second pressure oil seal at the upper position is pressed by the cover plate, the top of the second spacer is pressed by the second elastic retaining ring, the cover plate is installed on the sealing sleeve, the second elastic retaining ring is installed on the outside of the lead screw, a plurality of radial through holes are opened on the second spacer, and the plurality of radial through holes are respectively communicated with the inner cavity of the lead screw, the outlet joint is installed on one side wall of the sealing sleeve and penetrates the motor seat, and the outlet joint is communicated with one of the radial through holes through the gap between the upper and lower second pressure oil seals.

[0006] The utility model provides an inlet anti-leakage unit and an outlet anti-leakage unit at the inlet and outlet ends of the lead screw, respectively. During the working process of the lead screw, the coolant enters the inner cavity of the lead screw from the inlet joint, takes away the heat of the lead screw, and is discharged from the outlet joint to ensure the transmission accuracy of the lead screw. A first spacer is added between the lead screw and the first pressure oil seal, and a second spacer is added between the lead screw and the second pressure oil seal. The first spacer and the second spacer replace the lead screw and the first pressure oil seal and the second pressure oil seal for a long time in friction contact. The structure is stable, reliable, and has a long service life. The wear of the lead screw can be avoided. The first O-ring and the second O-ring can be used to avoid the leakage of the coolant and ensure the cooling effect of the lead screw.

[0007] There is a clearance fit between the lead screw and the second spacer, and the second spacer is provided with a plurality of radial through holes. When the lead screw starts to work, there is a slight relative rotation between the lead screw and the second spacer. When the outlet joint and the radial through holes are not aligned, it can ensure that the coolant can still pass through the second spacer and enter the outlet joint normally. During the normal operation of the lead screw, due to the temperature increase and expansion of the lead screw, the clearance between the lead screw and the second spacer is eliminated, and the two will not rotate relative to each other directly.

[0008] The inlet anti-leakage unit forms a closed external structure at the inlet end of the screw. After the coolant enters the screw from the inlet joint, it will not overflow except for the channel reserved inside the screw. The outlet anti-leakage unit forms a separate sealing structure at the outlet end of the screw, which can be installed independently after the screw is installed. The whole is fixed to the upper side of the bearing pressure plate by screws, which reduces the difficulty of installation.

[0009] Preferably, a drain port joint is installed on one side wall of the sealing sleeve, the drain port joint is arranged below the outlet joint and penetrates the motor seat, the bottom end of the second spacer sleeve and the sealing sleeve form a labyrinth sealing structure, the drain port joint is opposite to the labyrinth sealing structure, and the drain port joint is communicated with the space below the second pressure oil seal located at the bottom. The labyrinth sealing structure can further enhance the anti-leakage effect of the outlet anti-leakage unit. When the second pressure oil seal fails, the coolant can flow out of the motor seat through the drain port joint, preventing the coolant from directly leaking to the upper bearing and avoiding damage to the upper bearing.

[0010] Preferably, the first pressure oil seal and the second pressure oil seal are both made of nitrile rubber. The first pressure oil seal and the second pressure oil seal need to be in long-term friction contact with the first spacer and the second spacer respectively. The pressure oil seal made of nitrile rubber has good sealing effect and long service life.

[0011] Preferably, the upper end of the inner cavity of the screw is blocked by a plug to facilitate screw processing and screw internal cleaning. If the screw is not cleaned thoroughly, iron filings are easily mixed with the coolant, causing unnecessary damage.

[0012] Compared with the prior art, the utility model has the following advantages: the utility model has a leak-proof structure of a vertically arranged hollow cooling screw, a first spacer is added between the screw and the first pressure oil seal, and a second spacer is added between the screw and the second pressure oil seal. The first spacer and the second spacer replace the long-term friction contact between the screw and the first pressure oil seal and the second pressure oil seal. The structure is stable, reliable, and has a long service life. The wear of the screw can be avoided. In combination with the first O-ring and the second O-ring, leakage of coolant can be avoided, thereby ensuring the cooling effect and transmission accuracy of the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A cross-sectional schematic diagram of a lead screw and its supporting structure in an embodiment;

[0014] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0015] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0016] The specific reference numerals in the figure are as follows:

[0017] 1-screw, 11-lower bearing, 12-upper bearing, 13-tail end seat, 14-front end seat, 15-bearing pressure plate, 16-coupling, 17-motor seat, 18-plug, 21-inlet joint, 22-cooling jacket, 23-first pressure oil seal, 24-first spacer, 25-first O-type sealing ring, 26-first elastic retaining ring, 31-outlet joint, 32-sealing sleeve, 33-second pressure oil seal, 34-second spacer, 35-second O-type sealing ring, 36-second elastic retaining ring, 37-radial through hole, 38-gap between the upper and lower second pressure oil seals, 39-drain port joint, 30-cover plate, 4-labyrinth sealing structure. DETAILED DESCRIPTION

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0019] The leak-proof structure of the vertically arranged hollow cooling screw of the embodiment, such as Figure 1 to Figure 3As shown, the lower and upper parts of the lead screw 1 are respectively installed with a lower bearing 11 and an upper bearing 12, the lower bearing 11 is installed on the tail end seat 13, the upper bearing 12 is installed on the front end seat 14 and is pressed by a bearing pressure plate 15, the top end of the lead screw 1 is connected to the output shaft of the motor through a coupling 16, the motor is installed on a motor seat 17, the upper end of the inner cavity of the lead screw 1 is blocked by a plug 18, the leak-proof structure includes an inlet leak-proof unit arranged on the lower side of the lower bearing 11 and an outlet leak-proof unit arranged on the upper side of the upper bearing 12, the inlet leak-proof unit includes an inlet joint 21, a cooling jacket 22 and a first pressure The oil seal 23, the first spacer 24, the first O-ring 25 and the first elastic retaining ring 26, the cooling jacket 22 is fixed on the lower side of the tail end seat 13, the cooling jacket 22 is sleeved on the outer side of the bottom end of the screw 1, the inlet joint 21 is installed on the bottom end of the cooling jacket 22, the inlet joint 21 is communicated with the inner cavity of the screw 1, the first spacer 24 is arranged on the outer side of the bottom end of the screw 1 with a clearance fit, the first O-ring 25 is arranged between the screw 1 and the first spacer 24, the first pressure oil seal 23 is arranged between the cooling jacket 22 and the first spacer 24, and the top of the first pressure oil seal 23 is pressed by the first elastic retaining ring 26 The first elastic retaining ring 26 is installed on the inner wall of the cooling sleeve 22. The outlet leakage prevention unit includes an outlet joint 31, a sealing sleeve 32, and a second pressure oil seal 33, a second spacer sleeve 34, a second O-ring 35, a second elastic retaining ring 36 and a cover plate 30 arranged inside the sealing sleeve 32. The sealing sleeve 32 is fixed to the upper side of the bearing pressure plate 15 by screws. The sealing sleeve 32 is sleeved on the outer side of the upper end of the screw 1. The second spacer sleeve 34 is arranged on the outer side of the upper end of the screw 1 with a clearance fit. The second O-ring 35 is arranged between the screw 1 and the second spacer sleeve 34, and between the second spacer sleeve 34 and the sealing sleeve 32. Two second pressure oil seals 33 are arranged above and below, the top of the second pressure oil seal 33 at the upper position is pressed by the cover plate 30, the top of the second spacer 34 is pressed by the second elastic retaining ring 36, the cover plate 30 is installed on the sealing sleeve 32, the second elastic retaining ring 36 is installed on the outside of the screw 1, and the second spacer is provided with a plurality of radial through holes 37, which are respectively communicated with the inner cavity of the screw 1, and the outlet joint 31 is installed on one side wall of the sealing sleeve 32 and penetrates the motor seat 17, and the outlet joint 31 is communicated with a radial through hole 37 through the gap 38 between the upper and lower second pressure oil seals 33.

[0020] In this embodiment, a drain port joint 39 is installed on one side wall of the sealing sleeve 32. The drain port joint 39 is arranged below the outlet joint 31 and penetrates the motor base 17. The bottom end of the second spacer sleeve 34 and the sealing sleeve 32 form a labyrinth sealing structure 4. The drain port joint 39 is opposite to the labyrinth sealing structure 4, and the drain port joint 39 is communicated with the space below the second pressure oil seal 33 located at the bottom.

[0021] In this embodiment, the first pressure oil seal 23 and the second pressure oil seal 33 are both pressure oil seals made of nitrile rubber; the first spacer 24 and the second spacer 34 are respectively heat-treated to increase strength and wear resistance.

[0022] The inlet anti-leakage unit forms a closed external structure at the inlet end of the screw 1. After the coolant enters the screw 1 through the inlet joint 21, it will not overflow except for the reserved channel inside the screw 1. The outlet anti-leakage unit forms a separate sealing structure at the outlet end of the screw 1, which can be independently installed after the screw 1 is installed. The whole is fixed to the upper side of the bearing pressure plate 15 by screws, which reduces the difficulty of installation. In addition, the first spacer 24 and the second spacer 34 replace the screw 1 and the first pressure oil seal 23 and the second pressure oil seal 33 for a long time. The structure is stable, reliable, and has a long service life. It can avoid the wear of the screw 1. In combination with the first O-ring 25 and the second O-ring 35, it can avoid the leakage of the coolant and ensure the cooling effect and transmission accuracy of the screw 1.

[0023] During the operation of the screw 1, the coolant enters the inner cavity of the screw 1 through the inlet joint 21, takes away the heat of the screw 1, and is discharged from the outlet joint 31 to ensure the transmission accuracy of the screw 1. When the second pressure oil seal 33 fails, the coolant can flow out of the motor seat 17 through the drain port joint 39, preventing the coolant from directly leaking to the upper bearing 12 and causing damage to the upper bearing 12.

Claims

1. A leak-proof structure for a vertically arranged hollow cooling screw, wherein the lower and upper parts of the screw are respectively provided with a lower bearing and an upper bearing, wherein the lower bearing is installed on the tail end seat, and the upper bearing is installed on the front end seat and is pressed by a bearing pressure plate, wherein the top end of the screw is connected to the output shaft of the motor via a coupling, and the motor is installed on the motor seat, wherein: The anti-leakage structure comprises an inlet anti-leakage unit arranged on the lower side of the lower bearing and an outlet anti-leakage unit arranged on the upper side of the upper bearing, the inlet anti-leakage unit comprises an inlet joint, a cooling jacket, and a first pressure oil seal, a first spacer, a first O-ring and a first elastic retaining ring arranged on the inner side of the cooling jacket, the cooling jacket is fixed on the lower side of the tail end seat, the cooling jacket is arranged on the outer side of the bottom end of the lead screw, the inlet joint is installed on the bottom end of the cooling jacket, the inlet joint is communicated with the inner cavity of the lead screw, the first spacer is arranged on the outer side of the bottom end of the lead screw with a clearance fit, the first O-ring is arranged between the lead screw and the first spacer, the first pressure oil seal is arranged between the cooling jacket and the first spacer, the top end of the first pressure oil seal is pressed by the first elastic retaining ring, and the first elastic retaining ring is installed on the inner wall of the cooling jacket, the outlet anti-leakage unit comprises an outlet joint, a sealing sleeve and a second pressure oil seal arranged on the inner side of the sealing sleeve The invention relates to a sealing sleeve, a second spacer, a second O-ring, a second elastic retaining ring and a cover plate, wherein the sealing sleeve is fixed to the upper side of the bearing pressure plate by screws, the sealing sleeve is arranged on the outer side of the upper end of the lead screw, the second spacer is arranged on the outer side of the upper end of the lead screw with a clearance fit, the second O-ring is arranged between the lead screw and the second spacer, and two second pressure oil seals are arranged between the second spacer and the sealing sleeve, the top of the second pressure oil seal located at the upper position is pressed by the cover plate, the top of the second spacer is pressed by the second elastic retaining ring, the cover plate is installed on the sealing sleeve, the second elastic retaining ring is installed on the outer side of the lead screw, a plurality of radial through holes are opened on the second spacer, and the plurality of radial through holes are respectively communicated with the inner cavity of the lead screw, the outlet joint is installed on one side wall of the sealing sleeve and penetrates the motor seat, and the outlet joint is communicated with one of the radial through holes through the gap between the upper and lower second pressure oil seals.

2. The leak-proof structure of the vertically arranged hollow cooling screw according to claim 1, characterized in that: A drain port joint is installed on one side wall of the sealing sleeve, and the drain port joint is arranged below the outlet joint and penetrates the motor seat. The bottom end of the second spacer sleeve and the sealing sleeve form a labyrinth sealing structure. The drain port joint is opposite to the labyrinth sealing structure, and the drain port joint is communicated with the space below the second pressure oil seal located at the bottom.

3. The leak-proof structure of the vertically arranged hollow cooling screw according to claim 1, characterized in that: The first pressure oil seal and the second pressure oil seal are both pressure oil seals made of nitrile rubber.

4. The leak-proof structure of the vertically arranged hollow cooling screw according to claim 1, characterized in that: The upper end of the inner cavity of the lead screw is blocked by a plug.

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