CN110666529A - Automatic tool changing high-speed electric spindle with middle hole filled with water - Google Patents
Automatic tool changing high-speed electric spindle with middle hole filled with water Download PDFInfo
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- CN110666529A CN110666529A CN201911094918.6A CN201911094918A CN110666529A CN 110666529 A CN110666529 A CN 110666529A CN 201911094918 A CN201911094918 A CN 201911094918A CN 110666529 A CN110666529 A CN 110666529A
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- pull rod
- main shaft
- rotary joint
- sealing
- water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/70—Stationary or movable members for carrying working-spindles for attachment of tools or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/10—Arrangements for cooling or lubricating tools or work
- B23Q11/1015—Arrangements for cooling or lubricating tools or work by supplying a cutting liquid through the spindle
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- Mechanical Engineering (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The utility model provides a mesopore leads to automatic tool changing high-speed electric main shaft of water, which comprises an outer shell, the main shaft, wear to be equipped with the pull rod in the hollow structure of main shaft, the front end of pull rod is connected with the drawing claw, wear to be equipped with the dish spring on the pull rod, another end spiro union of dish spring has sealed position sleeve, the pull rod rear end behind the sealed position sleeve is connected with rotary joint, the pull rod center has the cooling water passageway, the jar pole center of unclamping cylinder is the cavity, be provided with support bearing behind the pull rod in the cavity, unclamping cylinder fixed connection is in the shell rear end, the atmoseal ring comprises outer loop and the inner ring of being fixed together with the outer loop, rear end fixedly connected with at the unclamping cylinder supports the cover, set up two sealing ring grooves in the installation round hole of support cover, all install the sealing washer in the sealing ring groove, it is 0.. The electric spindle can reach the performance of similar products abroad through tests.
Description
Technical Field
The invention relates to an electric spindle, in particular to a high-speed electric spindle capable of automatically changing tools, and belongs to the technical field of mechanical equipment.
Background
The high-speed electric spindle with the rotating speed of over 9000r/min is a core basic spare part in the equipment manufacturing industry of the existing numerical control machine tool, and the electric spindle needs to have a hollow water cooling structure and can be used for tool changing. The existing electric spindle technology is sealed off in China abroad, and basically depends on import, the import price is high, and the main technical barriers that the localization cannot be realized are as follows:
first, the problem of concentricity; the electric main shaft generally comprises a shell (also called a shell), a front end cover (also called a sealing cover), a stator arranged in the shell, a main shaft (also called a rotor), a knife striking mechanism positioned in a cavity of the main shaft and the like, wherein the front part and the rear part of the main shaft are supported in the shell by two sets of bearings, the knife striking mechanism is generally that a pull rod penetrates through the hollow main shaft, the front end of the pull rod is connected with the rear part of a knife claw, a disc spring is arranged outside the pull rod in a penetrating way, the rear end of the disc spring is respectively propped against the inside of the main shaft, the rear end of the disc spring is propped against a section behind the pull rod (the adjacent sections are connected by screw threads), the rear end of the pull rod extends out of the main shaft, a knife striking cylinder is arranged behind the electric main shaft and matched with the pull rod, the knife striking is completed by driving the pull rod to advance by the knife striking cylinder, and because a large amount of heat can be generated, in order to meet the requirement of cooling the main shaft, the tool beating structure is also provided with a cooling structure, the cooling structure is usually that an axial through hole is arranged in a pull rod, the rear end of the pull rod is connected with a rotary joint, the rotary joint is connected with a cooling liquid pipeline, the electric main shaft currently used in China basically depends on an import, wherein the concentricity problem which is an important reason that the main shaft cannot be produced in China is a concentricity problem, because the main shaft is provided with a front set of support bearing and a rear set of support bearing, the main shaft and the pull rod rotate synchronously during operation, the rear support bearing of the pull rod also needs to move axially during tool beating, the main shaft can only be a floating support, the rear end of the pull rod is also connected with the rotary joint, the support of the rotary joint also needs to be highly concentric with the main shaft, once one or more concentricity differences exist among the components, obvious vibration can occur when the electric main shaft runs at high speed, the machining precision of the machine tool is influenced, great noise is generated, and fatigue damage is also caused; under the condition that the electric main shafts produced by most domestic manufacturers meet the requirement of high-speed operation, automatic tool changing can be realized, and mesopore water cooling cannot be realized, or mesopore water cooling cannot be realized;
secondly, when cooling the cutter, cooling water flows back from the front end and enters the interior of the electric spindle, so that the electric spindle is damaged;
thirdly, the insulation resistance of the stator is low;
fourthly, the main shaft has poor sealing performance and is easy to enter water to cause faults;
fifthly, once the rotary joint is damaged, water easily enters the spindle, and the service life and the cost performance of the automatic tool changing high-speed electric spindle are affected by the problems.
Disclosure of Invention
The invention aims to overcome the problems in the existing manufacturing process of the high-speed electric spindle with the automatic tool changing function by the aid of the middle hole water and provides the high-speed electric spindle with the automatic tool changing function by the aid of the middle hole water.
In order to realize the purpose of the invention, the following technical scheme is adopted: the center hole water-through automatic tool changing high-speed electric spindle comprises a shell, a stator arranged in the shell, a spindle wound with a winding, a front cover with a hole and a unclamping cylinder, wherein the spindle penetrates through the front cover, and an air seal ring is arranged at the front end of the front cover; the main shaft is arranged in the shell through a front supporting bearing seat and a rear supporting bearing seat, the main shaft is of a hollow structure, a pull rod penetrates through the hollow structure of the main shaft, the pull rod is of a multi-section structure, the sections are connected through threads, the front end of the pull rod is connected with a pull claw, a disc spring penetrates through the pull rod, one end of the disc spring is propped in the main shaft, the other end of the disc spring is screwed with a sealing positioning sleeve, the rear end of the pull rod behind the sealing positioning sleeve is connected with a rotary joint, a cooling water channel is arranged in the center of the pull rod and is communicated with a water channel of the rotary joint, the center of a cylinder rod of the unclamping cylinder is a cavity, a pull rod rear supporting bearing is arranged in the cavity, the pull rod penetrates through the pull rod rear supporting bearing, the unclamping cylinder is fixedly connected to the rear end of the shell, the stator is of a plastic package structure, the air seal ring is composed of an outer ring, the radial air holes are communicated with the axial air channel, a first annular groove is formed in the outer peripheral surface of the inner ring, the first annular groove corresponds to the radial air holes in position, the radial air holes are located outside the first annular groove in the radial direction, a plurality of radial air distribution through holes are formed in the bottom surface of the first annular groove, the front support bearing seat and the rear support bearing seat are in interference fit with the inner cavity of the shell, and the interference magnitude is 0.005-0.01 mm; the rear support bearing of the pull rod is in interference fit with the cavity, and the interference magnitude is 0.006-0.008; two sealing gaskets are arranged in the middle of the disc spring; the periphery of the pull claw, the periphery of the sealing positioning sleeve and the periphery of the sealing gasket are provided with grooves, the grooves formed in the periphery of the pull claw and the sealing positioning sleeve are two grooves, a sealing ring is sleeved in each groove, the sealing ring is in interference fit with a cavity at the position, the interference magnitude is 0.5mm, the rear end face of the support sleeve fixedly connected with the rear end of the unclamping cylinder is provided with an installation round hole, the diameter of the installation round hole is larger than that of the rotary joint, two sealing ring grooves are formed in the hole, rotary joint sealing rings are arranged in the two sealing ring grooves, and the rotary joint is in interference fit with the rotary joint sealing rings; the interference range between the rotary joint and the sealing ring is 0.25mm to 0.35 mm.
Further, the method comprises the following steps of; and a second annular groove is formed in the radial air hole of the outer ring, and corresponds to the annular groove in position.
Further, the method comprises the following steps of; the number of the air distribution through holes is 4-12.
Further, the method comprises the following steps of; the number of the air distribution through holes is 8.
Further, the method comprises the following steps of; an annular groove III is formed in the inner circumferential surface of the inner ring, and the tail end of each air distribution through hole is located in the annular groove III.
Further, the method comprises the following steps of; and the unilateral gap between the main shaft and the air seal ring is 0.02 mm.
Further, the method comprises the following steps of; the interference magnitude between the rotary joint and the sealing ring is 0.3 mm.
Further, the method comprises the following steps of; the water outlet of the rotary joint is positioned outside the support sleeve.
The invention has the positive and beneficial technical effects that: adopt interference fit between this electricity main shaft individual part, the concentricity problem under the three support circumstances has been solved, this electricity main shaft equipment is accomplished the back concentricity steerable within 0.01mm, can satisfy the high-speed moving requirement of electricity main shaft, the problem that insulation resistance is low has been solved to the stator plastic envelope, the atmoseal ring has solved the inside problem of water reflux entering main shaft, good sealed can be guaranteed to individual sealing washer, can also play the effect of supporting and guaranteeing the concentricity, rotary joint's outlet is external, even damage can not lead to rivers to go into inside the electricity main shaft yet, this electricity main shaft can reach the performance of foreign like product through the experiment, the price reaches the third of foreign product and can have objective profit.
Drawings
Fig. 1 is an overall schematic view of the present invention.
Fig. 2 is one of enlarged schematic views of an electric spindle portion.
FIG. 3 is an overall schematic view of the motorized spindle air seal ring.
FIG. 4 is a schematic view of the outer ring of the gas seal ring.
FIG. 5 is a schematic view of the inner ring of the gas seal ring.
FIG. 6 is a schematic view of the circular face of the inner ring of the gas seal ring.
Fig. 7 is a second enlarged schematic view of the electric spindle portion.
Fig. 8 is a schematic view of a support sleeve.
Detailed Description
In order to more fully explain the implementation of the present invention, examples of the implementation of the present invention are provided. These examples are merely illustrative of the present invention and do not limit the scope of the present invention.
The invention is explained in further detail in connection with the accompanying drawings, in which: 1: a housing; 2: a main shaft; 3: a front cover; 4: an air seal ring; 41: an axial gas passage; 42: a radial air hole; 43: an outer ring; 44: an inner ring; 45: a first annular groove; 46: a gas distribution through hole; 47: a second annular groove; 48: a third annular groove; 5: a front support bearing block; 6: the rear support bearing seat; 7: a pull rod; 8: pulling a claw; 81: a first sealing ring on the pull claw; 82: a second sealing ring on the pull claw; 9: a disc spring; 10: a first sealing gasket; 101 a sealing ring on a first sealing gasket; 11: a second sealing gasket; 111: a sealing ring on the second sealing gasket; 12: sealing the positioning sleeve; 121: a first sealing ring of the sealing positioning sleeve; 122: a sealing ring II of the sealing positioning sleeve; 13: a knife striking cylinder; 14: a cylinder rod; 15: the bearing is supported behind the pull rod; 16: a support sleeve; 161: mounting a round hole; 162 sealing ring groove; 17: a rotary joint; 171: a water outlet; 18: a gas passage;
19: and a stator.
As shown in the attached drawings, the middle-hole water-through automatic tool changing high-speed electric spindle comprises a shell 1, a stator 19 arranged in the shell, a spindle 2 wound with a winding, a front cover 3 with a hole and a tool beating cylinder 13, wherein the tool beating cylinder can be a cylinder, a gas passage is processed on the shell 1, a gas transition channel which is opposite to gas and leads to a gas seal ring is also arranged on the front cover, the spindle passes through the front cover, the stator has a plastic package structure, and the gas seal ring 4 is arranged at the front end of the front cover; the main shaft passes through preceding support bearing frame 5 and back support bearing frame 6 and sets up in the shell, and the main shaft is hollow structure, wears to be equipped with pull rod 7 in the hollow structure of main shaft, and the pull rod is the multistage structure, through threaded connection between the multistage, and the front end of pull rod is connected with draws claw 8, wears to be equipped with dish spring 9 on the pull rod, and the one end top of dish spring is in the main shaft, and another end of dish spring has connect sealed position sleeve 12 soon, and the pull rod rear end behind the sealed position sleeve is connected with rotary joint 17, and the pull rod center has the cooling water passageway, and the cooling water passageway is linked together with rotary joint's water route, the jar pole center of unclamping cylinder be the cavity, be provided with pull rod rear support bearing 15 in the cavity, the pull rod passes from pull rod rear support bearing, unclamping cylinder 13 fixed connection is in the shell rear end, above the structure that has. The stator is provided with a plastic package structure. The plastic package can effectively prevent the reduction of the insulation resistance.
The gas seal ring 4 consists of an outer ring 43 and an inner ring 44 fixed together with the outer ring, an axial gas channel 41 and a radial gas hole 42 are arranged on the outer ring, the radial gas hole is communicated with the axial gas channel, a first annular groove 45 is arranged on the outer peripheral surface of the inner ring, the first annular groove corresponds to the radial gas hole in position, the radial gas hole is radially positioned outside the first annular groove, and a plurality of radial gas distribution through holes 46 are arranged on the bottom surface of the first annular groove for further; the number of the air distribution through holes is 4-12, more specifically in the embodiment, the number of the air distribution through holes is 8, the 8 air distribution through holes are as shown in figure 6, a second annular groove is formed in the position of a radial air hole in the outer ring and corresponds to the position of the second annular groove, a third annular groove is formed in the inner circumferential surface of the inner ring, the tail end of each air distribution through hole is located in the third annular groove, the unilateral gap between the spindle and the air seal ring is 0.02mm, and the structure and the gap design of the air seal ring can effectively prevent water from flowing back to enter the electric spindle.
The front support bearing seat 5 and the rear support bearing seat 6 are in interference fit with the inner cavity of the shell, and the interference magnitude is 0.005-0.01 mm; the pull rod rear support bearing 15 is in interference fit with the cavity, and the interference magnitude is 0.006-0.008; the middle of the disc spring is provided with two sealing gaskets which are shown as 10 and 11, the periphery of the pull claw, the periphery of the sealing positioning sleeve and the periphery of the sealing gasket are all provided with grooves, sealing rings are all sleeved in the grooves, the periphery of the pull claw, the periphery of the sealing positioning sleeve and the periphery of the sealing gasket are respectively provided with a groove, the grooves are respectively sleeved with a sealing ring, the sealing rings on the two sealing gaskets are shown as 101 and 111 in the figure, the two sealing rings on the pull claw are shown as 81 and 82, the sealing rings and the cavity at the position are in interference fit, the interference magnitude is 0.5mm, the rear end surface of the supporting sleeve 16 fixedly connected with the rear end of the cylinder is provided with a mounting round hole 161, the diameter of the mounting round hole is larger than that of the rotary joint, two sealing ring grooves are formed in the hole, the two sealing grooves are shown as 162, rotary joint sealing rings are arranged in the two sealing ring grooves, and the rotary joint 14 and the rotary joint sealing rings are in interference fit; the interference range between the rotary joint and the sealing ring is 0.25mm to 0.35 mm. In the example, the interference magnitude between the rotary joint and the sealing ring is 0.3 mm. The water outlet of the rotary joint is positioned outside the support sleeve. The mounting and supporting structure of the rotary joint can ensure concentricity and effective support, does not influence axial movement of the rotary joint along with the pull rod, and is an important component of the main shaft.
After the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and it is intended that all simple modifications, equivalent changes and modifications made to the above embodiments based on the technical spirit of the present invention shall fall within the technical scope of the present invention, and the present invention shall not be limited to the embodiments illustrated in the description.
The utility model provides a mesopore leads to automatic tool changing high-speed electric main shaft of water, which comprises an outer shell, the main shaft, wear to be equipped with the pull rod in the hollow structure of main shaft, the front end of pull rod is connected with the drawing claw, wear to be equipped with the dish spring on the pull rod, another end spiro union of dish spring has sealed position sleeve, the pull rod rear end behind the sealed position sleeve is connected with rotary joint, the pull rod center has the cooling water passageway, the jar pole center of unclamping cylinder is the cavity, be provided with support bearing behind the pull rod in the cavity, unclamping cylinder fixed connection is in the shell rear end, the atmoseal ring comprises outer loop and the inner ring of being fixed together with the outer loop, rear end fixedly connected with at the unclamping cylinder supports the cover, set up two sealing ring grooves in the installation round hole of support cover, all install the sealing washer in the sealing ring groove, it is 0.. The electric spindle can reach the performance of similar products abroad through tests.
Claims (8)
1. The center hole water-through automatic tool changing high-speed electric spindle comprises a shell, a stator arranged in the shell, a spindle wound with a winding, a front cover with a hole and a unclamping cylinder, wherein the spindle penetrates through the front cover, and an air seal ring is arranged at the front end of the front cover; the main shaft passes through preceding supporting bearing frame and back supporting bearing frame and sets up in the shell, the main shaft is hollow structure, wear to be equipped with the pull rod in the hollow structure of main shaft, the pull rod is the multistage structure, through threaded connection between the multistage, the front end of pull rod is connected with draws the claw, wear to be equipped with the dish spring on the pull rod, the one end top of dish spring is in the main shaft, another end of dish spring has connect sealed position sleeve soon, the pull rod rear end behind the sealed position sleeve is connected with rotary joint, the pull rod center has the cooling water passageway, the cooling water passageway is linked together with rotary joint's water route, the jar pole center of unclamping cylinder be the cavity, be provided with support bearing behind the pull rod in the cavity, the pull rod passes in the support bearing behind the pull rod, unclamping cylinder fixed connection is at the shell: the stator is provided with a plastic package structure, the gas seal ring consists of an outer ring and an inner ring fixed together with the outer ring, an axial gas channel and a radial gas hole are formed in the outer ring, the radial gas hole is communicated with the axial gas channel, a first annular groove is formed in the outer peripheral surface of the inner ring, the first annular groove corresponds to the radial gas hole in position, the radial gas hole is located outside the first annular groove in the radial direction, a plurality of radial gas distribution through holes are formed in the bottom surface of the first annular groove, the front support bearing seat and the rear support bearing seat are in interference fit with the inner cavity of the shell, and the interference magnitude is 0.005-0.01 mm; the rear support bearing of the pull rod is in interference fit with the cavity, and the interference magnitude is 0.006-0.008; two sealing gaskets are arranged in the middle of the disc spring; the periphery of the pull claw, the periphery of the sealing positioning sleeve and the periphery of the sealing gasket are provided with grooves, the grooves formed in the periphery of the pull claw and the sealing positioning sleeve are two grooves, a sealing ring is sleeved in each groove, the sealing ring is in interference fit with a cavity at the position, the interference magnitude is 0.5mm, the rear end face of the support sleeve fixedly connected with the rear end of the unclamping cylinder is provided with an installation round hole, the diameter of the installation round hole is larger than that of the rotary joint, two sealing ring grooves are formed in the hole, rotary joint sealing rings are arranged in the two sealing ring grooves, and the rotary joint is in interference fit with the rotary joint sealing rings; the interference range between the rotary joint and the sealing ring is 0.25mm to 0.35 mm.
2. The center hole water-through automatic tool changing high-speed electric spindle according to claim 1, characterized in that: and a second annular groove is formed in the radial air hole of the outer ring, and corresponds to the annular groove in position.
3. The center hole water-through automatic tool changing high-speed electric spindle according to claim 1, characterized in that: the number of the air distribution through holes is 4-12.
4. The center hole water-through automatic tool changing high-speed electric spindle according to claim 1, characterized in that: the number of the air distribution through holes is 8.
5. The center hole water-through automatic tool changing high-speed electric spindle according to claim 1, characterized in that: an annular groove III is formed in the inner circumferential surface of the inner ring, and the tail end of each air distribution through hole is located in the annular groove III.
6. The center hole water-through automatic tool changing high-speed electric spindle according to claim 1, characterized in that: and the unilateral gap between the main shaft and the air seal ring is 0.02 mm.
7. The center hole water-through automatic tool changing high-speed electric spindle according to claim 1, characterized in that: the interference magnitude between the rotary joint and the sealing ring is 0.3 mm.
8. The center hole water-through automatic tool changing high-speed electric spindle according to claim 1, characterized in that: the water outlet of the rotary joint is positioned outside the support sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911094918.6A CN110666529A (en) | 2019-11-11 | 2019-11-11 | Automatic tool changing high-speed electric spindle with middle hole filled with water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911094918.6A CN110666529A (en) | 2019-11-11 | 2019-11-11 | Automatic tool changing high-speed electric spindle with middle hole filled with water |
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| Publication Number | Publication Date |
|---|---|
| CN110666529A true CN110666529A (en) | 2020-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911094918.6A Pending CN110666529A (en) | 2019-11-11 | 2019-11-11 | Automatic tool changing high-speed electric spindle with middle hole filled with water |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112518394A (en) * | 2020-12-08 | 2021-03-19 | 广州市昊志机电股份有限公司 | Mechanical tool changing center water outlet electric spindle and machine tool |
| CN112975459A (en) * | 2021-04-12 | 2021-06-18 | 大连理工大学 | Vacuum mandrel rotary type ultralow-temperature medium internal spraying type electric spindle |
| CN113231862A (en) * | 2021-04-09 | 2021-08-10 | 广州市昊志机电股份有限公司 | Main shaft broach structure and electric main shaft |
| CN113770801A (en) * | 2021-10-18 | 2021-12-10 | 一拖(洛阳)柴油机有限公司 | Double-channel pneumatic lubricating and cooling device of special boring machine boring head |
| CN112518394B (en) * | 2020-12-08 | 2024-05-31 | 广州市昊志机电股份有限公司 | Electric spindle and machine tool for water outlet of mechanical tool changing center |
-
2019
- 2019-11-11 CN CN201911094918.6A patent/CN110666529A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112518394A (en) * | 2020-12-08 | 2021-03-19 | 广州市昊志机电股份有限公司 | Mechanical tool changing center water outlet electric spindle and machine tool |
| CN112518394B (en) * | 2020-12-08 | 2024-05-31 | 广州市昊志机电股份有限公司 | Electric spindle and machine tool for water outlet of mechanical tool changing center |
| CN113231862A (en) * | 2021-04-09 | 2021-08-10 | 广州市昊志机电股份有限公司 | Main shaft broach structure and electric main shaft |
| CN112975459A (en) * | 2021-04-12 | 2021-06-18 | 大连理工大学 | Vacuum mandrel rotary type ultralow-temperature medium internal spraying type electric spindle |
| CN113770801A (en) * | 2021-10-18 | 2021-12-10 | 一拖(洛阳)柴油机有限公司 | Double-channel pneumatic lubricating and cooling device of special boring machine boring head |
| CN113770801B (en) * | 2021-10-18 | 2023-12-29 | 一拖(洛阳)柴油机有限公司 | Double-channel pneumatic lubrication and cooling device for boring head of special boring machine |
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