A screw lift with self-lubricating mechanism

Abstract

The present invention relates to a screw lifter with a self-lubricating mechanism in the field of lifting equipment. Through an extrusion ring that is linked with a threaded sleeve and reciprocates up and down and a connecting cavity opened in the shell wall of an immersion cylinder, when the screw lifter is in operation, the extrusion ring cooperates with a fixed column below it to extrude lubricating oil, so that the lubricating oil circulates between the connecting cavity and the inner cavity of the rotating cylinder, thereby reducing manual maintenance and improving the contact lubrication effect between the lubricating oil and the screw. In addition, the circulating lubricating oil fully absorbs the heat on the surface of the screw and brings the heat to the shell wall of the immersion cylinder, thereby achieving efficient cooling while fully lubricating the screw, and having good cooling and lubrication effects for high-frequency lifting screw lifters.

Description

Technical Field

[0001] The invention relates to a lift, in particular to a screw lift with a self-lubricating mechanism which is applied in the field of lifting equipment. Background Art

[0002] Screw lifts are also called spiral transmission mechanisms. They are mainly used to convert rotational motion into linear motion or vice versa. There are mainly those that transmit motion, such as the feed screw of a machine tool worktable; there are also spiral transmission mechanisms that adjust the relative positions of parts. Screw lifts generally use grease lubrication to lubricate the joints between the screw and the threaded sleeve, reduce rigid friction, improve the smoothness of equipment operation, and extend the service life of components.

[0003] Existing lubricating oil or grease needs to be filled manually, which is cumbersome to operate. In addition, the existing lubricating oil is easily deteriorated by heat, which affects the lubrication effect. In particular, the screw lift used for high-frequency lifting generates more heat during operation, which accelerates the deterioration of the lubricating oil. The lubricating oil replacement cycle is short, and the operator needs to check and replace it frequently. Summary of the invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the lubricating oil of the screw lift used at a high frequency is easy to deteriorate, resulting in cumbersome maintenance.

[0005] In order to solve the above problems, the present invention provides a screw lifter with a self-lubricating mechanism, comprising a casing and a self-lubricating mechanism; a screw is passed through the casing, the screw is threadedly connected to a threaded sleeve rotatably connected to the casing, a worm wheel is fixedly sleeved on the threaded sleeve, and the worm wheel is meshed with a worm passing through the casing;

[0006] The self-lubricating mechanism includes an infiltration cylinder sleeved on the outside of the screw rod and fixedly connected to the bottom surface of the casing, a rotating cylinder sleeved on the inside of the infiltration cylinder and fixedly connected to the lower end of the threaded sleeve, a follower cylinder vertically slidingly engaged with the screw rod is nested in the rotating cylinder, an extrusion ring is fixedly connected to the lower end of the follower cylinder, a sliding column is fixedly connected to the circumferential outer wall of the extrusion ring, a guide groove for the sliding column to slide is provided on the inner wall of the infiltration cylinder, when the sliding column slides in the guide groove, the sliding column drives the extrusion ring to rotate up and down, a fixed column is provided below the extrusion ring to slide with the inner wall thereof, and a support bar fixedly connected to the inner wall of the infiltration cylinder is fixedly connected to the lower end of the fixed column;

[0007] A connecting cavity is provided in the shell wall of the infiltration cylinder and is vertically distributed along its axial direction. The lower end of the connecting cavity is connected to the inner cavity of the infiltration cylinder. The upper end of the connecting cavity is connected to a connecting sleeve through a connecting pipe. The connecting sleeve is rotatably sleeved on the upper part of the rotating cylinder and is connected to the inner cavity of the rotating cylinder through a horizontal connecting hole provided on the side wall of the rotating cylinder. The cavity in the inner cavity of the infiltration cylinder below the extrusion ring and the rotating cylinder are filled with lubricating oil. The infiltration cylinder is made of heat-conducting material.

[0008] In the above-mentioned screw lift with self-lubricating mechanism, the circulation and heat dissipation of lubricating oil are realized by the extrusion ring rotating up and down and the connecting cavity opened in the wall of the infiltration cylinder shell.

[0009] As a further improvement of the present application, spirally distributed bristles are bonded to the inner wall of the follower cylinder, a chip collecting cylinder is connected to the lower part of the infiltration cylinder, and a blocking ring is clamped on the upper part of the chip collecting cylinder.

[0010] As a further improvement of the present application, the upper end of the fixed column is fixedly connected to a plug-in rod that is slidably nested with the screw rod, and the upper end of the plug-in rod is fixedly connected to a sliding disk that is integrally formed with the screw rod. A heat exchange chamber that abuts the sliding disk is opened inside the screw rod, and the bottom surface of the heat exchange chamber is connected to the prismatic chamber that passes through the lower part of the screw rod. The plug-in rod slides against the inner wall of the prismatic chamber, an upper connecting hole is opened on the sliding disk, and a lower connecting hole is opened on the bottom surface of the heat exchange chamber located outside the prismatic chamber.

[0011] As a further improvement of the present application, the rotating cylinder is a cylindrical structure with openings at both ends, and a connecting flange integrally formed therewith is provided at its upper end, and the connecting flange is fixedly connected to the lower end face of the threaded sleeve by bolts, and the follower cylinder is a prismatic cylindrical structure with openings at both ends, and its cross-section is a regular polygon, and a prismatic groove is provided at the bottom of the rotating cylinder for sliding against the outer wall of the follower cylinder.

[0012] As a further improvement of the present application, the extrusion ring is a horizontally arranged circular ring, the fixed column slides with the inner wall of the center hole of the extrusion ring, the guide groove is a closed annular groove opened on the inner wall of the infiltration cylinder and is high at both ends and low in the middle, and the number of sliding columns is two and they are symmetrically arranged on both sides of the extrusion ring.

[0013] As a further improvement of the present application, the vertical height of the extrusion ring is greater than the vertical height of the guide groove, and a sealing ring is nested in the upper part of the circumferential side wall thereof.

[0014] As a further improvement of the present application, a first filter screen is installed at the connecting port between the connecting cavity and the infiltration cylinder, the height of the blocking ring is lower than the first filter screen, and a second filter screen is installed on the inner side of the horizontal connecting hole of the rotating cylinder.

[0015] As a further improvement of the present application, the cross-section of the blocking ring is trumpet-shaped and has an opening in the center. Its upper end face is an annular surface with high edges and a low center. The blocking ring is clamped on the inner side of the upper part of the chip collecting barrel, and the chip collecting barrel is threadedly connected to the lower part of the infiltration barrel.

[0016] In summary, the present invention uses an extrusion ring that is linked to the threaded sleeve and reciprocates up and down, and a connecting cavity opened in the shell wall of the wetting cylinder. When the screw lifter is operating, the extrusion ring cooperates with the fixed column below it to squeeze the lubricating oil, so that the lubricating oil circulates between the connecting cavity and the inner cavity of the rotating cylinder, reducing manual maintenance while improving the contact lubrication effect between the lubricating oil and the screw. In addition, the circulating lubricating oil fully absorbs the heat on the surface of the screw and brings the heat to the shell wall of the wetting cylinder, achieving efficient cooling while fully lubricating the screw, and has good cooling and lubrication effects for high-frequency lifting screw lifts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of this application;

[0018] Figure 2 This is a schematic diagram of the transverse cross-sectional structure of the present application;

[0019] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 4 for Figure 2 A schematic diagram of the enlarged structure at B in the middle;

[0021] Figure 5 This is a schematic diagram of the assembly structure of the threaded sleeve and the extrusion ring in this application;

[0022] Figure 6 for Figure 5 Schematic diagram of the enlarged structure at C in the middle;

[0023] Figure 7 for Figure 5 Schematic diagram of the enlarged structure at D in the middle;

[0024] Figure 8 This is a schematic diagram of the assembly structure of the rotating cylinder and the follower cylinder in this application;

[0025] Fig. 9 It is a schematic diagram of the cross-sectional structure of the infiltration tube in this application;

[0026] Fig.10 It is a schematic diagram of the motion state of the extrusion ring in this application;

[0027] Fig.11 It is a schematic diagram of the flow of lubricating oil when the extrusion ring moves upward in this application;

[0028] Fig.12 It is a schematic diagram of the flow of lubricating oil when the extrusion ring moves downward in this application.

[0029] Description of the numbers in the figure:

[0030] 1. Casing; 2. Screw; 201. Heat exchange chamber; 202. Prismatic chamber; 203. Lower connecting hole; 3. Worm gear; 4. Worm; 5. Threaded sleeve; 6. Wetting cylinder; 601. Guide groove; 602. Connecting chamber; 7. Rotating cylinder; 8. Follower cylinder; 801. Bristles; 9. Extrusion ring; 901. Sliding column; 10. Connecting rod; 1001. Sliding disk; 1002. Upper connecting hole; 11. Fixed column; 12. Support bar; 13. Chip collecting cylinder; 14. Blocking ring; 15. Connecting pipe; 16. Connecting sleeve. DETAILED DESCRIPTION

[0031] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0032] The first implementation method:

[0033] Figure 1-12 A screw lift with a self-lubricating mechanism is shown, comprising a housing 1 and a self-lubricating mechanism; a screw 2 is passed through the housing 1, a threaded sleeve 5 rotatably connected to the screw 2 is threadedly connected to the housing 1, a worm wheel 3 is fixedly sleeved on the threaded sleeve 5, and a worm 4 passing through the housing 1 is meshed with the worm wheel 3;

[0034] The self-lubricating mechanism includes an infiltration cylinder 6 which is sleeved on the outside of the screw rod 2 and fixedly connected to the bottom surface of the casing 1, the outer wall of the infiltration cylinder 6 is provided with a heat exchange fin, the inner side of the infiltration cylinder 6 is provided with a rotating cylinder 7 which is sleeved on the outside of the screw rod 2 and fixedly connected to the lower end of the threaded sleeve 5, a follower cylinder 8 which is vertically slidably engaged with the screw rod 2 is nested in the rotating cylinder 7, an extrusion ring 9 is fixedly connected to the lower end of the follower cylinder 8, the threaded sleeve 5 drives the follower cylinder 8 to rotate through the rotating cylinder 7, and the follower cylinder 8 drives the extrusion ring 9 to rotate, a sliding column 901 is fixedly connected to the circumferential outer wall of the extrusion ring 9, a guide groove 601 for the sliding column 901 to slide is opened on the inner wall of the infiltration cylinder 6, when the sliding column 901 slides in the guide groove 601, the sliding column 901 drives the extrusion ring 9 to rotate up and down, a fixed column 11 which is slidably matched with the inner wall of the extrusion ring 9 is provided below the extrusion ring 9, and a support bar 12 which is fixedly connected to the inner wall of the infiltration cylinder 6 is fixedly connected to the lower end of the fixed column 11;

[0035] A connecting cavity 602 is provided in the shell wall of the infiltration cylinder 6 and is vertically distributed along its axial direction. The lower end of the connecting cavity 602 is connected to the inner cavity of the infiltration cylinder 6. The upper end of the connecting cavity 602 is connected to the connecting sleeve 16 through a connecting pipe 15. The connecting sleeve 16 is rotatably sleeved on the upper part of the rotating cylinder 7 and is connected to the inner cavity of the rotating cylinder 7 through a horizontal connecting hole provided on the side wall of the rotating cylinder 7. The cavity in the inner cavity of the infiltration cylinder 6 below the extrusion ring 9 and the rotating cylinder 7 are filled with lubricating oil. The infiltration cylinder 6 is made of heat-conducting material.

[0036] For details, please refer to Figure 10-12The lubricating oil filled in the inner cavity of the rotating cylinder 7 and the inner cavity of the infiltration cylinder 6 located below the extrusion ring 9 infiltrates and lubricates the screw 2. When the external power source drives the worm wheel 3 to rotate through the worm 4, the worm wheel 3 drives the threaded sleeve 5 to rotate. The threaded sleeve 5 drives the screw 2 to move up and down, realizing the lifting operation of the screw 2, so that the grooves at the bottom of the screw 2 at different positions are in contact with the lubricating oil, thereby increasing the lubrication area of ​​the screw 2;

[0037] At the same time, the threaded sleeve 5 drives the follower cylinder 8 and the extrusion ring 9 below it to rotate through the rotating cylinder 7, and the sliding column 901 on the circumferential side wall of the extrusion ring 9 rotates in the guide groove 601, so that the extrusion ring 9 rotates up and down. When the extrusion ring 9 moves downward to the position of the fixed column 11, the extrusion ring 9 squeezes the lubricating oil below it, so that the lubricating oil enters the connecting sleeve 16 through the connecting cavity 602 and the connecting pipe 15. The lubricating oil entering the connecting sleeve 16 enters the upper part of the rotating cylinder 7 through the horizontal connecting hole on the side wall of the rotating cylinder 7, and then flows downward along the annular gap between the follower cylinder 8 and the screw rod 2, realizing the circulation of the lubricating oil, so that the lubricating oil circulates between the inner cavity of the rotating cylinder 7 and the connecting cavity 602. Since the infiltration cylinder 6 is a heat-conducting material, the heat exchange between the circulating lubricating oil and the external atmosphere is accelerated, thereby reducing the temperature of the lubricating oil.

[0038] Compared with the traditional screw lifting mechanism, the present invention uses an extrusion ring 9 that is linked with the threaded sleeve 5 and reciprocates up and down, and a connecting cavity 602 opened in the shell wall of the infiltration tube 6. When the screw lifter is operating, the extrusion ring 9 cooperates with the fixed column 11 below it to squeeze the lubricating oil, so that the lubricating oil circulates between the connecting cavity 602 and the inner cavity of the rotating cylinder 7 sleeved on the outside of the screw 2, so that the lubricating oil fully absorbs the heat on the surface of the screw 2 and brings the heat to the shell wall of the infiltration tube 6, thereby achieving efficient cooling while fully lubricating the screw 2, and having a good cooling effect on high-frequency lifting screw lifts.

[0039] See also Figure 1 The rotating cylinder 7 is a cylindrical structure with openings at both ends, and a connecting flange integrally formed therewith is provided at its upper end. The connecting flange is fixedly connected to the lower end surface of the threaded sleeve 5 by bolts. The follower cylinder 8 is a prismatic cylindrical structure with openings at both ends, and its cross section is a regular polygon. A prismatic groove is provided below the rotating cylinder 7 to abut and slide against the outer wall of the follower cylinder 8.

[0040] Specifically, when the rotating cylinder 7 rotates, the follower cylinder 8 is driven to rotate synchronously therewith. At the same time, when the extrusion ring 9 moves up and down, the follower cylinder 8 is driven to move up and down in the prism groove of the rotating cylinder 7.

[0041] See also Figure 5 , Figure 8 and Fig.10The extrusion ring 9 is a horizontally arranged circular ring, the fixed column 11 slides with the inner wall of the center hole of the extrusion ring 9, the guide groove 601 is a closed annular groove opened on the inner wall of the infiltration tube 6 and is high at both ends and low in the middle, and the number of sliding columns 901 is two and they are symmetrically arranged on both sides of the extrusion ring 9.

[0042] Specifically, the symmetrically arranged sliding posts 901 enable the extrusion ring 9 to have better stability when sliding in the closed annular groove with high ends and low middle, thereby improving the stability of extrusion.

[0043] See also Figure 3 The vertical height of the extrusion ring 9 is greater than the vertical height of the guide groove 601, and a sealing ring is nested in the upper part of its circumferential side wall.

[0044] Specifically, when the extrusion ring 9 moves to the lowest position, the sealing ring on the upper part of the extrusion ring 9 is still located above the guide groove 601, thereby preventing the lubricating oil from leaking into the cavity above the extrusion ring 9 through the guide groove 601, thereby improving the effect of extruding the lubricating oil.

[0045] See also Figure 2 and Figure 5-7 The upper end of the fixed column 11 is fixedly connected to the plug rod 10 which is slidably nested with the screw rod 2. The upper end of the plug rod 10 is fixedly connected to the sliding disk 1001 which is integrally formed therewith. A heat exchange cavity 201 is provided inside the screw rod 2 to abut against the sliding disk 1001. The inner bottom surface of the heat exchange cavity 201 is connected to the prismatic cavity 202 which passes through the lower part of the screw rod 2. The plug rod 10 slides against the inner wall of the prismatic cavity 202. An upper connecting hole 1002 is provided on the sliding disk 1001. A lower connecting hole 203 is provided on the inner bottom surface of the heat exchange cavity 201 located outside the prismatic cavity 202.

[0046] Specifically, when the screw rod 2 moves downward, the screw rod 2 squeezes the lubricating oil, so that part of the lubricating oil enters the heat exchange chamber 201 through the lower connecting hole 203 and the upper connecting hole 1002 to infiltrate and exchange heat in the screw rod 2 .

[0047] Second implementation method:

[0048] Figure 3-5 A screw lift with a self-lubricating mechanism is shown. Based on the first embodiment, the inner wall of the follower cylinder 8 is bonded with spirally distributed bristles 801, the lower part of the infiltration cylinder 6 is connected to the chip collecting cylinder 13, and the upper part of the chip collecting cylinder 13 is clamped with a blocking ring 14.

[0049] Specifically, when the follower cylinder 8 rotates, the bristles 801 on its inner wall are driven to rotate and brush the threaded groove of the screw rod 2, thereby cleaning the debris stuck to the screw rod 2, so that the debris flows downward into the chip collecting cylinder 13 along with the circulating lubricating oil, thereby accelerating the precipitation and centralized collection of impurities, and utilizing the blocking ring 14 to prevent the debris from being lifted up again as the flow direction of the lubricating oil changes, thereby improving the debris collection effect.

[0050] Compared with the traditional screw lift, the present invention uses the bristles 801 arranged on the inner wall of the follower cylinder 8 and the chip collecting cylinder 13 arranged at the bottom of the infiltration cylinder 6. The rotating follower cylinder 8 drives the spirally distributed bristles 801 to efficiently rotate and brush the spiral grooves and the outer surface of the spiral protrusions of the screw 2, which has a better effect of cleaning impurities. At the same time, the circulating lubricating oil is used to drive the debris and impurities into the chip collecting cylinder 13 for centralized collection to facilitate subsequent cleaning. In addition, the blocking ring 14 is used to reduce the secondary lifting of debris accumulated in the chip collecting cylinder 13.

[0051] See also Figure 2 and Figure 3 A first filter screen is installed at the connecting opening between the connecting cavity 602 and the infiltration cylinder 6 , the height of the blocking ring 14 is lower than the first filter screen, and a second filter screen is installed on the inner side of the horizontal connecting hole of the rotating cylinder 7 .

[0052] Specifically, it reduces the amount of debris that enters the communication cavity 602 as the lubricating oil circulates.

[0053] See also Figure 3 and Fig. 9 The blocking ring 14 has a trumpet-shaped cross section and an opening in the center. Its upper end surface is an annular surface with high edges and a low center. The blocking ring 14 is clamped on the inner side of the upper part of the chip collecting tube 13, and the chip collecting tube 13 is threadedly connected to the lower part of the infiltration tube 6.

[0054] Specifically, the blocking ring 14 having an annular surface with a high edge and a low center is convenient for collecting debris and impurities, and the blocking ring 14 having a trumpet-shaped cross section reduces the situation where debris is lifted up with the flow of lubricating oil.

[0055] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A screw lift with a self-lubricating mechanism, characterized in that: It comprises a casing (1) and a self-lubricating mechanism; the casing (1) is penetrated by a screw rod (2), the screw rod (2) is threadedly connected to a threaded sleeve (5) rotatably connected to the casing (1), the threaded sleeve (5) is fixedly sleeved with a worm wheel (3), and the worm wheel (3) is meshed with a worm (4) that penetrates the casing (1); The self-lubricating mechanism comprises an infiltration cylinder (6) sleeved on the outside of the screw rod (2) and fixedly connected to the bottom surface of the housing (1); a rotating cylinder (7) sleeved on the outside of the screw rod (2) and fixedly connected to the lower end of the threaded sleeve (5) is provided on the inner side of the infiltration cylinder (6); a follower cylinder (8) vertically slidably engaged with the screw rod (2) is nested in the rotating cylinder (7); an extrusion ring (9) is fixedly connected to the lower end of the follower cylinder (8); a sliding column (901) is fixedly connected to the circumferential outer wall of the extrusion ring (9); a guide groove (601) for sliding of the sliding column (901) is provided on the inner wall of the infiltration cylinder (6); when the sliding column (901) slides in the guide groove (601), the sliding column (901) drives the extrusion ring (9) to rotate up and down; a fixed column (11) is provided below the extrusion ring (9) to slide with the inner wall thereof; a support bar (12) fixedly connected to the inner wall of the infiltration cylinder (6) is fixedly connected to the lower end of the fixed column (11); A connecting cavity (602) is provided in the shell wall of the impregnation cylinder (6) and is vertically distributed along the axial direction thereof. The lower end of the connecting cavity (602) is connected to the inner cavity of the impregnation cylinder (6). The upper end of the connecting cavity (602) is connected to a connecting sleeve (16) via a connecting pipe (15). The connecting sleeve (16) is rotatably sleeved on the upper part of the rotating cylinder (7) and is connected to the inner cavity of the rotating cylinder (7) via a horizontal connecting hole provided on the side wall of the rotating cylinder (7). The cavity in the inner cavity of the impregnation cylinder (6) located below the extrusion ring (9) and the rotating cylinder (7) are filled with lubricating oil. The impregnation cylinder (6) is made of a heat-conducting material.

2. A screw lift with a self-lubricating mechanism according to claim 1, characterized in that: The inner wall of the follower cylinder (8) is bonded with brush bristles (801) distributed in a spiral shape, the lower part of the infiltration cylinder (6) is connected to a chip collecting cylinder (13), and the upper part of the chip collecting cylinder (13) is clamped with a blocking ring (14).

3. A screw lifter with a self-lubricating mechanism according to claim 2, characterized in that: The upper end of the fixed column (11) is fixedly connected to a plug rod (10) that is slidably nested with the screw rod (2), and the upper end of the plug rod (10) is fixedly connected to a sliding disk (1001) that is integrally formed with the screw rod (2). A heat exchange cavity (201) that abuts against the sliding disk (1001) is provided inside the screw rod (2), and the inner bottom surface of the heat exchange cavity (201) is connected to a prism cavity (202) that passes through the lower part of the screw rod (2). The plug rod (10) abuts against and slides against the inner wall of the prism cavity (202), an upper connecting hole (1002) is provided on the sliding disk (1001), and a lower connecting hole (203) is provided on the inner bottom surface of the heat exchange cavity (201) that is located outside the prism cavity (202).

4. The screw lifter with a self-lubricating mechanism according to claim 1, characterized in that: The rotating cylinder (7) is a cylindrical structure with openings at both ends, and a connecting flange integrally formed therewith is provided at its upper end, and the connecting flange is fixedly connected to the lower end surface of the threaded sleeve (5) by means of bolts. The follower cylinder (8) is a prismatic cylindrical structure with openings at both ends, and its cross section is a regular polygon. A prismatic groove is provided below the rotating cylinder (7) and is in abutment and sliding contact with the outer wall of the follower cylinder (8).

5. The screw lifter with a self-lubricating mechanism according to claim 1, characterized in that: The extrusion ring (9) is a horizontally arranged circular ring. The fixing column (11) is slidably matched with the inner wall of the center hole of the extrusion ring (9). The guide groove (601) is a closed annular groove opened on the inner wall of the infiltration tube (6) and having high ends and a low middle. The number of sliding columns (901) is two and they are symmetrically arranged on both sides of the extrusion ring (9).

6. The screw lifter with a self-lubricating mechanism according to claim 1, characterized in that: The vertical height of the extrusion ring (9) is greater than the vertical height of the guide groove (601), and a sealing ring is embedded in the upper part of its circumferential side wall.

7. The screw lifter with a self-lubricating mechanism according to claim 2, characterized in that: A first filter screen is installed at the communication opening between the communication chamber (602) and the infiltration cylinder (6); the height of the blocking ring (14) is lower than the first filter screen; and a second filter screen is installed on the inner side of the horizontal communication hole of the rotating cylinder (7).

8. The screw lifter with a self-lubricating mechanism according to claim 2, characterized in that: The blocking ring (14) has a trumpet-shaped cross section and an opening in the center. Its upper end surface is an annular surface with a high edge and a low center. The blocking ring (14) is clamped on the inner side of the upper part of the chip collecting tube (13). The chip collecting tube (13) is threadedly connected to the lower part of the infiltration tube (6).

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