Drilling device for mechanical part machining

Abstract

The drilling device for mechanical part machining comprises a machining table and a drilling machine body, a protection mechanism is arranged on the drilling machine body, the drilling machine body comprises a feeding table, a motor and a drill bit, the motor is installed on the feeding table, and the drill bit is driven through the motor; the protection mechanism comprises a protection sleeve, a fixed sleeve, a transmission sleeve, an adjusting shaft sleeve, a compression spring, a first valve block, a second valve block, a first wave spring, a second wave spring, a start-stop piston and a grinding piece. The protection mechanism is installed on the outer side of the drill bit. The device has the advantages of being high in safety, convenient to operate and low in production cost, and the problems that metal chippings and cooling liquid generated in the drilling process of traditional equipment are prone to splashing, cleanliness and safety of the working environment are affected, supply of the cooling liquid is generally fixed and cannot be adjusted according to the actual rotating speed and the load condition of a drill bit, and the service life of the drill bit is affected are solved. And the cooling effect is not good.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, in particular to a drilling device for machining mechanical parts. Background Art

[0002] The processing of mechanical parts involves a variety of processes, among which drilling is one of the most common processes. With the development of the manufacturing industry, the requirements for drilling accuracy and efficiency are getting higher and higher. Traditional drilling equipment often has some shortcomings. For example, the metal debris and coolant generated during the drilling process are easy to splash, affecting the cleanliness and safety of the working environment; at the same time, the use of coolant is not economical and there is waste; in addition, the burr treatment of the edge after drilling also requires additional processes, which increases production costs and time.

[0003] The existing drilling equipment has the following main problems. The metal debris and coolant generated during the drilling process are easy to splash, posing a safety hazard to the operator. Traditional low-end and medium-end special control equipment often requires manual application or dripping of lubricating oil, which is cumbersome to operate and requires frequent shutdowns for refueling. High-end equipment circulates coolant, which, on the one hand, causes waste of coolant. On the other hand, the cost is too high. Burrs are often left on the edges after drilling, which requires additional grinding steps to deal with, increasing processing time and cost. Therefore, a drilling device for mechanical parts processing is needed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a drilling device for machining mechanical parts, which has the advantages of high safety, easy operation and low production cost. It solves the problems that metal debris and coolant generated by traditional equipment during the drilling process are easy to splash, affecting the cleanliness and safety of the working environment, and the supply of coolant is usually fixed and cannot be adjusted according to the actual rotation speed and load conditions of the drill bit, resulting in poor cooling effect, and sometimes even causing overheating or increased wear of the drill bit.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: A drilling device for machining mechanical parts, comprising a machining table and a drilling machine body, wherein a protection mechanism is provided on the drilling machine body; The drilling rig body includes a feed table, a motor and a drill bit, wherein the motor is mounted on the feed table and drives the drill bit; The protection mechanism comprises a protection sleeve, a fixed sleeve, a transmission sleeve, an adjusting sleeve, a compression spring, a first valve block, a second valve block, a first wave spring, a second wave spring, a start-stop piston and a grinding sheet, and the protection mechanism is installed on the outside of the drill bit; A coolant circulation box and a submersible pump are arranged in the processing table. A liquid supply pipe which is connected with the protective sleeve is arranged on the outer side of the coolant circulation box. The liquid outlet end of the submersible pump is connected with the liquid supply pipe. A pressure relief pipe is arranged between the liquid supply pipe and the side wall of the coolant circulation box. A pressure relief valve is arranged on the pressure relief pipe. A return pipe which is connected with the coolant circulation box is arranged on the side end surface of the fixed sleeve.

[0006] As a preferred drilling device for machining mechanical parts of the present invention, the compression spring is installed in a fixed sleeve, the protective sleeve is inserted into the fixed sleeve from the bottom and is elastically slidably connected to the fixed sleeve, the side wall of the protective sleeve is provided with a coolant inlet connected to the liquid supply pipe, and the side wall of the fixed sleeve is provided with a reflux port connected to the reflux pipe.

[0007] As a preferred drilling device for machining mechanical parts of the present invention, a liquid storage chamber and a piston chamber are arranged in the side wall of the protective sleeve, a first valve hole is arranged on the side end face of the liquid storage chamber, the start-stop piston and the second wave spring are installed in the piston chamber, the start-stop piston and the protective sleeve are elastically connected through the second wave spring, a sliding hole is arranged on the top of the piston chamber, the first valve block is installed in the sliding hole and is slidably connected to the protective sleeve, a valve plate is arranged on the first valve block, and a third valve hole corresponding to the coolant inlet is arranged on the side end face of the valve plate.

[0008] As a preferred drilling device for machining mechanical parts of the present invention, the transmission sleeve is installed in the protective sleeve and movably connected thereto, the inner end surface of the transmission sleeve is provided with a cross groove, and the side end surface of the drill bit is provided with a cross shaft that slides with the cross groove, the drill bit and the transmission sleeve are transmitted through the cooperation of the cross shaft and the cross groove, and the grinding sheet is detachably installed at the bottom of the transmission sleeve.

[0009] As a preferred drilling device for machining mechanical parts of the present invention, a guide rod and a first axial hole are provided on the top of the protective sleeve, a rotatably connected transmission shaft is provided in the first axial hole, an external thread is provided on the top of the transmission shaft, a guide hole slidably matched with the guide rod is provided on the bottom of the adjusting sleeve, a screw hole matched with the transmission shaft is provided on the bottom of the adjusting sleeve, and the transmission sleeve is rotatably connected to the adjusting sleeve through a bearing.

[0010] As a preferred drilling device for machining mechanical parts of the present invention, the side wall of the machining table is provided with a second axial hole, a rotatably connected adjusting knob is provided in the second axial hole, and the adjusting knob is engaged with the transmission shaft through a toothed bevel for transmission.

[0011] As a preferred drilling device for machining mechanical parts of the present invention, the side wall of the transmission sleeve is provided with an annular groove, a swing block rotatably connected is provided in the annular groove, the inner end face of the side wall of the protective sleeve is provided with an annular groove slidably matched with the second valve block, the second valve block is installed in the annular groove and is slidably connected to the protective sleeve through a first wave spring, the top of the second valve block is a conical structure, and the side end face of the second valve block is provided with a second valve hole corresponding to the first valve hole.

[0012] As a preferred drilling device for machining mechanical parts of the present invention, the upper and lower end faces of the swing block are provided with rotating shafts, the swing block is rotatably connected to the transmission sleeve via the rotating shaft, and the lower end face of the swing block away from the rotating shaft is provided with a universal ball.

[0013] As a preferred drilling device for machining mechanical parts of the present invention, a first hollow groove is arranged on the top of the transmission sleeve, a second hollow groove is arranged on the side end surface of the transmission sleeve, and a sealing sleeve is arranged between the protective sleeve and the fixed sleeve.

[0014] As a preferred drilling device for machining mechanical parts of the present invention, the upper end surface of the machining table is provided with a cutter hole, the bottom of the cutter hole is connected to a return pipe, and a detachable filter is provided in the coolant circulation box.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention isolates the drilling environment from the external environment through a protective sleeve and a fixed sleeve, thereby preventing metal debris, cutting fluid and other pollutants generated during the drilling process from splashing around the processing table, and keeping the working area clean. The design of the protective mechanism not only prevents debris from splashing, but more importantly, it reduces the chance of operators coming into contact with high-speed rotating drill bits and other dangerous parts. The isolation measures reduce the possibility of other work processes being affected by the drilling operation, such as avoiding debris from contaminating other parts being processed or affecting other ongoing operations.

[0016] 2. The present invention allows the coolant to be reused through the design of the coolant circulation system, reducing the demand for new coolant and further reducing production costs. In addition, the recycling of the coolant also helps to reduce pollution to the environment and is in line with the concept of green manufacturing. The coolant flow rate can be automatically adjusted according to the rotation speed of the drill bit through the cooperation of the transmission sleeve, the swing block and the second valve plate. This means that the system can provide the best cooling effect at different drilling depths and speeds, which not only ensures the service life of the drill bit, but also ensures the stability and consistency of the processing process. By intelligently adjusting the coolant flow rate, problems such as overheating of the drill bit due to insufficient cooling or waste of coolant due to excessive cooling can be effectively avoided, thereby ensuring processing quality and efficiency.

[0017] 3. The present invention enables the coolant supply to be automatically opened and closed according to actual needs through the design of the start-stop piston, wave spring and the first valve block, thereby simplifying the operating process and reducing the workload of operators. The automatic start-stop function can reduce improper coolant supply due to human factors, further ensuring the smooth progress of the processing process. The integrated grinding function can process the edge of the hole when drilling, remove burrs, and improve the processing accuracy and surface quality of the workpiece. The height of the grinding disc can be adjusted very conveniently by adjusting the knob and the drive shaft, making the equipment easier to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 An exploded view of the protection mechanism of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the protection mechanism of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle; Figure 6 For the present invention Figure 4 Enlarged view of point B in the middle; Figure 7 For the present invention Figure 4 Enlarged view of point C in the middle; Figure 8 It is a schematic diagram of the transmission sleeve structure of the present invention; Fig. 9 This is a schematic diagram of the structure of the first valve block of the present invention; Fig.10 It is a schematic diagram of the swing block structure of the present invention.

[0019] In the figure: 1, processing table; 101, coolant circulation box; 102, submersible pump; 103, filter; 104, liquid supply pipe; 1041, pressure relief pipe; 105, return pipe; 106, cutter hole; 2, drilling rig body; 201, feed table; 202, motor; 203, drill bit; 2031, cross shaft; 3, protection mechanism; 301, protection sleeve; 3011, guide rod; 3012, first shaft hole; 3013, coolant inlet; 3014, liquid storage chamber; 3015, first valve hole; 3016, piston chamber; 3017, second shaft hole; 3018, annular slide; 302, fixed sleeve; 3021, return port; 30 3. Transmission sleeve; 3031. Cross groove; 3032. First hollow groove; 3033. Annular dark groove; 3034. Throwing block; 30341. Universal ball; 30342. Rotating shaft; 3035. Second hollow groove; 304. Adjusting sleeve; 3041. Guide hole; 3042. Screw hole; 305. Compression spring; 306. Second valve block; 3061. Second valve hole; 307. First wave spring; 308. Start-stop piston; 309. First valve block; 3091. Valve plate; 3092. Third valve hole; 310. Sealing sleeve; 311. Transmission shaft; 312. Adjusting knob; 313. Second wave spring; 314. Grinding sheet. DETAILED DESCRIPTION

[0020] See also Figure 1-Figure 10 , a drilling device for machining mechanical parts, comprising a machining table 1 and a drilling machine body 2, wherein a protection mechanism 3 is arranged on the drilling machine body 2; The drilling machine body 2 includes a feed platform 201, a motor 202 and a drill bit 203. The motor 202 is installed on the feed platform 201, and the drill bit 203 is driven by the motor 202. The protection mechanism 3 includes a protection sleeve 301, a fixed sleeve 302, a transmission sleeve 303, an adjusting sleeve 304, a compression spring 305, a first valve block 309, a second valve block 306, a first wave spring 307, a second wave spring 313, a start-stop piston 308 and a grinding sheet 314. The protection mechanism 3 is installed on the outside of the drill bit 203; A coolant circulation box 101 and a submersible pump 102 are arranged in the processing table 1. A liquid supply pipe 104 that penetrates the protective sleeve 301 is arranged on the outer side of the coolant circulation box 101. The liquid outlet end of the submersible pump 102 is connected with the liquid supply pipe 104. A pressure relief pipe 1041 is arranged between the liquid supply pipe 104 and the side wall of the coolant circulation box 101. A pressure relief valve is arranged on the pressure relief pipe 1041 to prevent the coolant inlet 3013 from being blocked by the valve plate 3091 and causing damage to the submersible pump 102. A reflux pipe 105 that penetrates the coolant circulation box 101 is arranged on the side end surface of the fixed sleeve 302.

[0021] The protective mechanism 3 is sleeved on the outside of the drill bit 203 to isolate the drilling environment from the external environment, thereby avoiding debris and coolant splashing during the drilling process and ensuring the cleanliness of the processing table 1. The submersible pump 102, the coolant circulation box 101 and the protective mechanism 3 cooperate to achieve the circulation of the coolant and reduce the waste of the coolant.

[0022] Furthermore, the compression spring 305 is installed in the fixed sleeve 302, the protective sleeve 301 is inserted into the fixed sleeve 302 from the bottom and is elastically slidably connected to it, the side wall of the protective sleeve 301 is provided with a coolant inlet 3013 that is connected to the liquid supply pipe 104, and the side wall of the fixed sleeve 302 is provided with a reflux port 3021 that is connected to the reflux pipe 105.

[0023] The coolant is pumped into the coolant inlet 3013 by the submersible pump 102, so that the coolant cools the drill bit 203 and the parts. The protective sleeve 301 structure with elastic sliding connection allows the protective sleeve 301 to be retracted into the fixed sleeve 302 during the downward feeding of the drill bit 203, thereby not affecting the feeding of the drill bit 203, and can ensure that the protective sleeve 301 always keeps in contact with the surface of the part under the reset action of the compression spring 305 during the drilling process, thereby avoiding leakage of coolant.

[0024] Furthermore, a liquid storage chamber 3014 and a piston chamber 3016 are provided in the side wall of the protective sleeve 301, a first valve hole 3015 is provided on the side end face of the liquid storage chamber 3014, a start-stop piston 308 and a second wave spring 313 are installed in the piston chamber 3016, the start-stop piston 308 and the protective sleeve 301 are elastically connected via the second wave spring 313, a sliding hole is provided on the top of the piston chamber 3016, a first valve block 309 is installed in the sliding hole and is slidably connected to the protective sleeve 301, a valve plate 3091 is provided on the first valve block 309, and a third valve hole 3092 corresponding to the coolant inlet 3013 is provided on the side end face of the valve plate 3091.

[0025] When the protective sleeve 301 squeezes the part, the start-stop piston 308 slides upward under the action of pressure, thereby squeezing the air in the piston chamber 3016, so that the first valve block 309 slides upward under the action of air pressure, so that the third valve hole 3092 gradually overlaps with the coolant inlet 3013, and the coolant inlet 3013 opens, and the coolant enters the liquid storage chamber 3014 through the first valve hole 3015 into the protective sleeve 301. When drilling is achieved, when the protective sleeve 301 squeezes the part, the coolant automatically flows into the protective sleeve 301 for cooling. When the drilling is completed, the start-stop piston 308 rebounds under the resetting action of the second wave spring 313, so that the first valve block 309 is reset, and the coolant is automatically disconnected, so as to avoid splashing of coolant and reduce waste of coolant.

[0026] Furthermore, the transmission sleeve 303 is installed in the protective sleeve 301 and is movably connected thereto. The inner end surface of the transmission sleeve 303 is provided with a cross groove 3031. The side end surface of the drill bit 203 is provided with a cross shaft 2031 that slides with the cross groove 3031. The drill bit 203 and the transmission sleeve 303 are transmitted through the cooperation of the cross shaft 2031 and the cross groove 3031. The grinding sheet 314 is installed at the bottom of the transmission sleeve 303 by bolts.

[0027] The drill bit 203 drives the transmission sleeve 303 to rotate, thereby driving the grinding sheet 314 at the bottom to rotate, and grinding the edge of the hole drilled by the drill bit 203 to avoid burrs on the edge of the hole and affect the quality of the workpiece.

[0028] Furthermore, a guide rod 3011 and a first axial hole 3012 are provided at the top of the protective sleeve 301, a rotatably connected transmission shaft 311 is provided in the first axial hole 3012, an external thread is provided at the top of the transmission shaft 311, a guide hole 3041 slidably matched with the guide rod 3011 is provided at the bottom of the adjusting sleeve 304, a screw hole 3042 matched with the transmission shaft 311 is provided at the bottom of the adjusting sleeve 304, and the transmission sleeve 303 is rotatably connected to the adjusting sleeve 304 through a bearing.

[0029] By rotating the transmission shaft 311, the adjustment sleeve 304 slides up and down under the action of the screw movement, thereby driving the transmission sleeve 303 to slide up and down, and adjusting the height of the grinding sheet 314 at the bottom of the transmission sleeve 303 to prevent the grinding sheet 314 from being unable to contact the workpiece surface after being worn and losing the grinding effect. The bottom of the transmission sleeve 303 can be extended to facilitate the replacement of the grinding sheet 314.

[0030] Furthermore, a second shaft hole 3017 is provided on the side wall of the processing table 1 , and a rotatably connected adjusting knob 312 is provided in the second shaft hole 3017 . The adjusting knob 312 and the transmission shaft 311 are meshed and transmitted through the gear bevel.

[0031] By rotating the adjusting knob 312, the transmission shaft 311 is driven to rotate, and the height of the grinding disc 314 can be quickly adjusted without the aid of external tools, thereby improving the convenience of equipment operation.

[0032] Furthermore, the side wall of the transmission sleeve 303 is provided with an annular groove 3033, and a swing block 3034 for rotation connection is provided in the annular groove 3033. The inner end face of the side wall of the protective sleeve 301 is provided with an annular groove 3018 for sliding cooperation with the second valve block 306. The second valve block 306 is installed in the annular groove 3018 and is slidingly connected to the protective sleeve 301 through the first wave spring 307. The top of the second valve block 306 is a conical structure, and the side end face of the second valve block 306 is provided with a second valve hole 3061 corresponding to the first valve hole 3015.

[0033] When the transmission sleeve 303 rotates, the swing block 3034 expands outward under the action of centrifugal force, thereby squeezing the upper end surface of the second valve block 306, causing the second valve block 306 to slide downward, so that the second valve hole 3061 gradually overlaps with the first valve hole 3015. When the speed of the transmission shaft 311 is higher, that is, the higher the speed of the drill bit 203 and the greater the heat generation, the centrifugal force of the swing block 3034 is greater, so that the overlap between the first valve hole 3015 and the second valve hole 3061 is higher, and the coolant flow rate is greater, so that the coolant flow rate changes in real time with the speed.

[0034] Furthermore, the upper and lower end surfaces of the swing block 3034 are provided with a rotating shaft 30342 , the swing block 3034 is rotatably connected to the transmission sleeve 303 via the rotating shaft 30342 , and the lower end surface of the swing block 3034 away from the rotating shaft 30342 is provided with a universal ball 30341 .

[0035] The friction between the swing block 3034 and the second hairpin block is reduced by the universal ball 30341, thereby improving the smoothness of the extension and retraction of the swing block 3034, reducing the wear of the swing block 3034, and increasing the service life of the equipment.

[0036] Furthermore, a first hollow groove 3032 is provided on the top of the transmission sleeve 303 , a second hollow groove 3035 is provided on the side end surface of the transmission sleeve 303 , and a sealing sleeve 310 is provided between the protective sleeve 301 and the fixed sleeve 302 .

[0037] The first hollow groove 3032 and the second hollow groove 3035 ensure that the coolant can pass through the transmission sleeve 303, and the sealing sleeve 310 prevents metal debris mixed in the coolant from getting stuck in the protective sleeve 301 and the fixed sleeve 302 to affect the stability of the equipment.

[0038] Furthermore, a cutter hole 106 is provided on the upper end surface of the processing table 1 , and the bottom of the cutter hole 106 is connected to the return pipe 105 , and a slidingly connected filter screen 103 is provided in the coolant circulation box 101 .

[0039] When the drill bit 203 passes through the part and enters the cutter hole 106, the coolant and the debris generated by drilling enter the return pipe 105 through the cutter hole 106, and after being filtered by the filter 103, the metal debris is intercepted by the filter 103, and the coolant flows into the coolant circulation box 101 and circulates through the submersible pump 102.

[0040] When using the device, before using it, check whether all parts are intact, especially key parts such as the motor 202, the drill bit 203, the protective sleeve 301, and the coolant circulation box 101. Check whether the coolant in the coolant circulation box 101 is sufficient and ensure that there are no impurities. Fix the parts to be processed on the processing table 1 to ensure that they are correctly positioned and firmly to avoid movement during the drilling process. Turn on the power of the submersible pump 102 and the motor 202, adjust the feed table 201 according to the processing requirements, and lower the drill bit 203 to a position close to the working surface. The motor 202 drives the drill bit 203 to start rotating and gradually descend to drill. At this time, the drill bit 203 drives the transmission sleeve 303 to rotate, thereby driving the grinding sheet 314 to start rotating to prepare for grinding the edge of the hole. When the drill bit 203 starts to rotate, the swing block 3034 in the transmission sleeve 303 will expand outwards under the action of centrifugal force, pushing the second valve block 306 to move downward, so that the second valve hole 3061 coincides with the first valve hole 3015, thereby allowing the coolant to flow into the protective sleeve 301, and the drill bit 203 starts rotating. The higher the speed, the greater the centrifugal force of the swing block 3034, and the coolant flow rate also increases accordingly to meet the higher heat generation requirements. When the protective sleeve 301 squeezes the parts, the start-stop piston 308 slides upward under the pressure, thereby squeezing the air in the piston chamber 3016, so that the first valve block 309 slides upward under the air pressure, so that the third valve hole 3092 gradually overlaps with the coolant inlet 3013, the coolant inlet 3013 opens, and the coolant enters the liquid storage chamber 3014 through the first valve hole 3015 and enters the protective sleeve 3016. 1, and when the drilling is completed, the start-stop piston 308 rebounds under the reset action of the second wave spring 313, so that the first valve block 309 is reset, and the coolant is automatically disconnected to avoid coolant splashing and reduce coolant waste. When the drilling is completed, the motor 202 and the submersible pump 102 are turned off, and the rotation of the drill bit 203 is stopped. If the height of the grinding sheet 314 needs to be adjusted, the adjustment knob 312 on the side wall of the processing table 1 can be turned to drive the transmission shaft 311 to rotate, so that the adjustment sleeve 304 slides up and down, thereby changing the height of the grinding sheet 314.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A drilling device for machining mechanical parts, comprising a machining table (1) and a drilling machine body (2), characterized in that: The drilling rig body (2) is provided with a protection mechanism (3); The drilling machine body (2) comprises a feed platform (201), a motor (202) and a drill bit (203); the motor (202) is mounted on the feed platform (201), and the drill bit (203) is driven by the motor (202); The protection mechanism (3) comprises a protection sleeve (301), a fixed sleeve (302), a transmission sleeve (303), an adjustment sleeve (304), a compression spring (305), a first valve block (309), a second valve block (306), a first wave spring (307), a second wave spring (313), a start-stop piston (308) and a grinding sheet (314); the protection mechanism (3) is installed on the outside of the drill bit (203); A cooling liquid circulation box (101) and a submersible pump (102) are arranged in the processing table (1); a liquid supply pipe (104) penetrating the protective sleeve (301) is arranged on the outside of the cooling liquid circulation box (101); a liquid outlet end of the submersible pump (102) is connected to the liquid supply pipe (104); and a return pipe (105) penetrating the cooling liquid circulation box (101) is arranged on the side end surface of the fixed sleeve (302).

2. A drilling device for machining mechanical parts according to claim 1, characterized in that: The compression spring (305) is installed in the fixed sleeve (302), the protective sleeve (301) is inserted into the fixed sleeve (302) from the bottom and is elastically slidably connected thereto, the side wall of the protective sleeve (301) is provided with a cooling liquid inlet (3013) that is connected to the liquid supply pipe (104), and the side wall of the fixed sleeve (302) is provided with a return port (3021) that is connected to the return pipe (105).

3. A drilling device for machining mechanical parts as claimed in claim 2, characterized in that: A liquid storage chamber (3014) and a piston chamber (3016) are provided in the side wall of the protective sleeve (301); a first valve hole (3015) is provided on the side end surface of the liquid storage chamber (3014); the start / stop piston (308) and the second wave spring (313) are installed in the piston chamber (3016); the start / stop piston (308) and the protective sleeve (301) are elastically connected via the second wave spring (313); a sliding hole is provided on the top of the piston chamber (3016); the first valve block (309) is installed in the sliding hole and is slidably connected to the protective sleeve (301); a valve plate (3091) is provided on the first valve block (309); and a third valve hole (3092) corresponding to the coolant inlet (3013) is provided on the side end surface of the valve plate (3091).

4. A drilling device for machining mechanical parts as claimed in claim 1, characterized in that: The transmission sleeve (303) is installed in the protective sleeve (301) and is movably connected thereto; the inner end surface of the transmission sleeve (303) is provided with a cross groove (3031); the side end surface of the drill bit (203) is provided with a cross shaft (2031) that slidably cooperates with the cross groove (3031); the drill bit (203) and the transmission sleeve (303) cooperate through the cross shaft (2031) and the cross groove (3031) to perform transmission; and the grinding sheet (314) is detachably installed at the bottom of the transmission sleeve (303).

5. A drilling device for machining mechanical parts as claimed in claim 4, characterized in that: The top of the protective sleeve (301) is provided with a guide rod (3011) and a first axial hole (3012); a rotatably connected transmission shaft (311) is provided in the first axial hole (3012); the top of the transmission shaft (311) is provided with an external thread; the bottom of the adjusting sleeve (304) is provided with a guide hole (3041) slidably matched with the guide rod (3011); the bottom of the adjusting sleeve (304) is provided with a screw hole (3042) matched with the transmission shaft (311); and the transmission sleeve (303) and the adjusting sleeve (304) are rotatably connected via a bearing.

6. A drilling device for machining mechanical parts as claimed in claim 5, characterized in that: The side wall of the processing table (1) is provided with a second axial hole (3017), and a rotatably connected adjusting knob (312) is provided in the second axial hole (3017), and the adjusting knob (312) and the transmission shaft (311) are meshed and transmitted through a toothed bevel.

7. A drilling device for machining mechanical parts as claimed in claim 3, characterized in that: The side wall of the transmission sleeve (303) is provided with an annular groove (3033), and a swing block (3034) that is rotatably connected is provided in the annular groove (3033). The inner end surface of the side wall of the protective sleeve (301) is provided with an annular groove (3018) that slidably cooperates with the second valve block (306). The second valve block (306) is installed in the annular groove (3018) and is slidably connected to the protective sleeve (301) through a first wave spring (307). The top of the second valve block (306) is a conical structure, and the side end surface of the second valve block (306) is provided with a second valve hole (3061) corresponding to the first valve hole (3015).

8. A drilling device for machining mechanical parts as claimed in claim 1, characterized in that: The top of the transmission sleeve (303) is provided with a first hollow groove (3032), the side end surface of the transmission sleeve (303) is provided with a second hollow groove (3035), and a sealing sleeve (310) is provided between the protective sleeve (301) and the fixed sleeve (302).

9. A drilling device for machining mechanical parts as claimed in claim 1, characterized in that: The upper end surface of the processing table (1) is provided with a cutter hole (106), the bottom of the cutter hole (106) is connected to the return pipe (105), and a detachable filter screen (103) is provided in the coolant circulation box (101).

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