Drill bit cooling device and drilling machine
By using mechanical sealing devices and internal clearance water inlet channels in the drilling machine, the problems of wear, water leakage and excessive drilling shaft length of the traditional drilling machine cooling device are solved, improving processing accuracy and reducing workpiece deformation.
Patent Information
- Application Number
- CN202422066408.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-26
AI Technical Summary
The cooling device of the traditional drilling machine has friction between the seal ring and the drill shaft, causing the seal ring to wear and leak water, and the drill shaft length is relatively long, resulting in high processing difficulty and low accuracy.
Mechanical sealing device is adopted, including a mechanical seal stationary ring and a mechanical seal rotary ring. The internal gap between the drill shaft and the drill shaft sleeve is used as the water inlet channel to ensure that the coolant does not leak.
It effectively solves the problem of seal ring wear and water leakage caused by long-term work of the drilling machine, and shortens the length of the drill shaft, improves processing accuracy and reduces workpiece deformation.
Smart Images
Figure CN222909939U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drill bit cooling, in particular to a drill bit cooling device and a drilling machine. Background Art
[0002] The structure of the cooling device of the traditional drilling machine is as Figure 2 , water enters from the external thread 101 straight-through joint and reaches the inside of the water inlet interface column 102. Due to the sealing effect of the sealing ring 103, water enters the inside from the drill shaft 105 and reaches the head of the drill shaft; when drilling, the thimble 112 contacts the rail web (workpiece to be drilled), compresses the spring 108 to realize water outlet, and completes the cooling of the drill bit 111; when drilling, the drill shaft 105 makes a continuous rotational movement, and the water inlet interface column 102 and the internal sealing ring 103 are stationary, which will cause friction between the sealing ring 103 and the drill shaft 105. In the long run, the sealing ring 103 will be worn and the water leakage will be serious, which will further cause water to enter the internal gearbox and cause problems such as rust and corrosion of internal parts; in addition, the drill bit cooling devices of drilling machines are basically water inlet from the tail. Due to the problem of the drilling stroke, the rotating shafts are all designed to be very long, resulting in problems such as great difficulty in machining the drill shaft, serious deformation of the workpiece, and great difficulty in machining accuracy. In view of the above defects, this application is proposed. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a drill bit cooling device and a drilling machine, which utilize the characteristics of the mechanical seal device to well solve the problems that the drill bit cooling device of the drilling machine is prone to wear during long-term operation and then leaks water, and solve the problem of the traditional long drill shaft.
[0004] To solve the above problems, the utility model provides a drill bit cooling device, which includes a drill shaft sleeve, a drill shaft and a sealing assembly. There is an internal gap between the drill shaft and the drill shaft sleeve. The drill shaft sleeve is provided with a water inlet, and a channel is provided in the drill shaft. The internal gap is connected with the water inlet and the channel. The sealing assembly is used to seal the internal gap, so that the coolant entering from the water inlet enters the channel through the internal gap without leakage occurring in the internal gap. The sealing assembly includes a mechanical seal stationary ring and a mechanical seal rotating ring arranged in the internal gap. A seal is formed between the mechanical seal stationary ring and the drill shaft sleeve, and a seal is formed between the mechanical seal rotating ring and the drill shaft. The contact surface between the mechanical seal rotating ring and the mechanical seal stationary ring is a graphite contact surface.
[0005] Optionally, the mechanical seal stationary ring can be made of ceramic material, silicon carbide or tungsten carbide, etc. The contact surface between the mechanical seal stationary ring and the mechanical seal rotating ring is preferably a ceramic contact surface. The contact surface between the two fittings is graphite against ceramic, which can have smooth surface friction for a long time without wear, and can effectively control the heat generated by friction due to being in the coolant.
[0006] According to an embodiment of the present utility model, a valve body is provided in the channel, and the valve body opens the channel during drilling operations.
[0007] According to an embodiment of the present utility model, the valve body includes a drill bit thimble and a thimble spring.
[0008] During drilling, the drill bit thimble contacts the web of the rail (or other workpiece to be processed), compressing the thimble spring to open the channel for water discharge, thereby completing the cooling of the drill bit.
[0009] According to an embodiment of the present utility model, a plurality of water inlets connected to the internal gap are provided on the drill shaft in the channel.
[0010] According to an embodiment of the present utility model, four water inlets are provided and are evenly distributed on the circumferential surface of the drill shaft.
[0011] According to an embodiment of the present utility model, a quick-connect fitting is installed at the water inlet.
[0012] The quick-connect fitting can be a copper quick-connect fitting.
[0013] According to an embodiment of the present utility model, the mechanical seal rotating ring is connected to the compression spring.
[0014] According to an embodiment of the present utility model, a bearing assembly and a oil seal assembly are provided between the drill shaft sleeve and the drill shaft.
[0015] A drilling machine includes the above-mentioned drill bit cooling device.
[0016] The beneficial effects of the present utility model are as follows: By providing the mechanical seal stationary ring and the mechanical seal rotating ring, and using the gap between the drill shaft and the drill shaft sleeve as the water inlet channel, and utilizing the characteristics of the mechanical seal device, the problems of easy wear and water leakage of the drilling machine during long-term operation are well solved. Moreover, since the internal gap between the drill shaft and the drill shaft sleeve is used as the water inlet position, the length of the drill shaft is shortened, thus solving the problem of the long drill shaft length caused by the coolant entering from one end of the drill shaft and discharging from the other end in the traditional cooling device. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0018] Figure 1 It is a schematic cross-sectional view of the drill bit cooling device;
[0019] Figure 2 It is a schematic cross-sectional view of the traditional drill bit cooling device;
[0020] Figure 1In: 001 - Drill shaft; 002 - Drill shaft bushing; 003 - Bearing; 004 - Gasket; 005 - Oil seal; 006 - Stationary ring of mechanical seal; 007 - Rotating ring of mechanical seal; 008 - Quick - connect fitting; 009 - Gasket; 010 - Bearing; 011 - Thrust bearing; 012 - Drill bit thimble; 013 - Thimble spring; 014 - Drill bit; 015 - Internal clearance; 016 - Compression spring; 017 - Channel
[0021] Figure 2 In: 101 - External - thread straight - through joint; 102 - Water - inlet interface column; 103 - Sealing ring; 104 - Bearing 61901; 105 - Drill shaft; 106 - Drill shaft bushing; 107 - Bearing; 108 - Thimble spring; 109 - Bearing; 110 - Thrust bearing; 111 - Drill bit; 112 - Drill bit thimble Detailed implementation mode
[0022] The following description is only used to disclose the present utility model so that those skilled in the art can implement the present utility model. The embodiments described below are only examples, and those skilled in the art can think of other obvious deformations. The basic principles defined in the following description of the present utility model can be applied to other implementation schemes, deformation schemes, improvement schemes, equivalent schemes, and other schemes that do not deviate from the spirit and scope of the present utility model.
[0023]
Embodiment 1
[0024] A drill - bit cooling device, such as Figure 1 , includes a drill - shaft bushing 002, a drill shaft 001, a drill bit 014 and a sealing assembly. Between the drill - shaft bushing 002 and the drill shaft 001, a bearing assembly and an oil - seal assembly 005 are provided. The bearing assembly includes bearings 010, 003 and a thrust bearing 011. Bearings 010 and 003 can generally be selected as deep - groove ball bearings. A gasket 004 is provided between the oil - seal assembly 005 and the bearing 003, and a gasket 009 is installed at the bearing 010.
[0025] There is an internal clearance 015 between the drill shaft 001 and the drill - shaft bushing 002. The drill - shaft bushing 002 is provided with a water - inlet. In this embodiment, a copper quick - connect fitting 008 is installed at the water - inlet. A channel 017 for coolant to pass through is provided in the drill shaft 001. The internal clearance 015 is connected to the water - inlet and the channel 017. Since the internal clearance 015 between the drill shaft 001 and the drill - shaft bushing 002 is used as the water - inlet position, the length of the drill shaft is shortened, thus solving the problem of the long drill - shaft length caused by the coolant entering from one end of the drill shaft and discharging from the other end in the traditional cooling device.
[0026] Channel 017 is provided with a plurality of water inlets on the drill shaft 001 that are connected to the internal gap 015 to ensure the water inflow. In this embodiment, four water inlets are provided and are evenly distributed on the circumferential surface of the drill shaft 001.
[0027] The sealing assembly is used to seal the internal gap 015 so that the coolant entering through the water inlet passes through the internal gap 015 and enters the channel 017 without leakage occurring at the internal gap 015. Specifically, the sealing assembly includes two sets of mechanical seal stationary rings 006 and mechanical seal rotating rings 007 provided in the internal gap 015. Seals are formed between the two-sided mechanical seal stationary rings 006 and the drill shaft sleeve 002. Other sealing components can also be used to achieve a better sealing effect. A seal is formed between the inner hole of the mechanical seal rotating ring 007 and the outer wall of the drill shaft 001. The contact surface between the mechanical seal rotating ring 007 and the mechanical seal stationary ring 006 is a graphite contact surface, and the contact surface between the mechanical seal stationary ring 006 and the mechanical seal rotating ring 007 is a ceramic contact surface. Preferably, the mechanical seal rotating ring 007 is generally made of graphite, and the mechanical seal stationary ring 006 can be selected from materials such as ceramic, silicon carbide, or tungsten carbide. In this embodiment, ceramic material is selected, and the contact surface between the two fittings is graphite against ceramic, which can undergo smooth surface friction for a long time without wear, and can effectively control the heat generated by friction due to being in the coolant.
[0028] Through the above solution, by utilizing the characteristics of the mechanical seal device, the problems of easy wear and water leakage during long-term operation of the drilling machine are well solved.
[0029] A compression spring 016 is provided between the two-sided mechanical seal rotating rings 007 to maintain the pressure between the mechanical seal rotating ring 007 and the mechanical seal stationary ring 006.
[0030] A valve body is provided in the channel 017. The valve body opens the channel 017 during the drilling operation. The valve body can be set as a manually opened valve body or an automatically opened valve body. In this embodiment, the valve body is realized by the cooperation of the drill tip 012 and the thimble spring 013. During drilling, the drill tip contacts the rail web (or other workpiece to be processed), compresses the thimble spring 013 to open the channel 017 to discharge water, and completes the cooling of the drill bit 014.
[0031] A drilling machine includes the above-mentioned drill bit cooling device.
[0032] Those skilled in the art should understand that the above description and the embodiments of the present invention shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The function and structural principle of the present invention have been shown and described in the embodiments. Without departing from the said principle, the embodiments of the present invention can have any deformation and modification.
Claims
1. A drill bit cooling device, characterized in that: The drill shaft (001) comprises a drill shaft sleeve (002), a drill shaft (001) and a sealing assembly, wherein an internal gap (015) is provided between the drill shaft (001) and the drill shaft sleeve (002), a water inlet is provided on the drill shaft sleeve (002), a channel (017) is provided in the drill shaft (001), the internal gap (015) is connected to the water inlet and the channel (017), and the sealing assembly is used to seal the internal gap (015) so that the coolant entering through the water inlet passes through the internal gap (015) and enters the channel (017) but not leaking out of the internal gap (015), the sealing assembly comprises a mechanical seal stationary ring (006) and a mechanical seal rotating ring (007) arranged in the internal gap (015), a seal is formed between the mechanical seal stationary ring (006) and the drill shaft sleeve (002), a seal is formed between the mechanical seal rotating ring (007) and the drill shaft (001), and the contact surface between the mechanical seal rotating ring (007) and the mechanical seal stationary ring (006) is a graphite contact surface.
2. The drill bit cooling device according to claim 1, characterized in that: The contact surface between the mechanical seal stationary ring (006) and the mechanical seal rotating ring (007) is a ceramic contact surface.
3. The drill bit cooling device according to claim 2, characterized in that: A valve body is provided in the channel (017), and the valve body opens the channel (017) when drilling is performed.
4. The drill bit cooling device according to claim 3, characterized in that: The valve body comprises a drill bit ejector pin (012) and an ejector pin spring (013).
5. The drill bit cooling device according to any one of claims 1 to 4, characterized in that: The channel (017) is provided with a plurality of water inlets on the drill shaft (001) which are connected to the internal gap (015).
6. The drill bit cooling device according to claim 5, characterized in that: Four water inlets are arranged and are evenly distributed on the circumferential surface of the drill shaft (001).
7. The drill bit cooling device according to any one of claims 1 to 4, characterized in that: A quick-twist joint (008) is installed at the water inlet.
8. The drill bit cooling device according to any one of claims 1 to 4, characterized in that: The mechanical seal rotating ring (007) is connected to the compression spring (016).
9. The drill bit cooling device according to any one of claims 1 to 4, characterized in that: A bearing assembly and an oil seal assembly are arranged between the drill shaft sleeve (002) and the drill shaft (001).
10. A drilling machine, characterized in that: A drill bit cooling device comprising the drill bit cooling device according to any one of claims 1 to 9.