Drilling equipment for piston pin of air compressor

Abstract

The invention discloses drilling equipment for a piston pin of an air compressor. The drilling equipment comprises a clamp, a clamp driving mechanism, an automatic feeding mechanism, a first drilling power head, a second drilling power head, a third drilling power head, an automatic material returning mechanism, an automatic material receiving mechanism and a controller. Wherein the clamp is used for clamping materials, and the clamp driving mechanism is used for driving the clamp to move; the automatic feeding mechanism is used for conveying materials to the clamp; the first drilling power head is used for drilling on one side of the piston pin, the second drilling power head is used for drilling on the other side of the piston pin, the third drilling power head is used for drilling on one side of the piston pin, and the automatic material returning mechanism is used for pushing materials out of the clamp; the automatic material receiving mechanism is used for receiving the materials pushed out of the clamp. In the whole machining process, feeding, material conveying, drilling, material returning and discharging are all achieved through an automatic mechanism, compared with manual drilling, the drilling efficiency is improved, and stability and standardization of product quality are facilitated.

Description

Technical Field

[0001] The present invention belongs to the field of piston pin processing equipment, and particularly relates to a drilling device for piston pins of air compressors. Background Art

[0002] The piston pin is a key component in a compressor that connects the piston and the crosshead (in compressors with crossheads) or directly connects to the driving component (in compressors without crossheads). It mainly functions to transmit torque and bear loads, transferring the reciprocating motion of the piston to achieve the suction, compression, and exhaust processes of the compressor.

[0003] To achieve specific functions such as lubrication, exhaust, weight reduction, etc., it is necessary to drill holes in the piston pins of air compressors. Through drilling, lubricating oil can better reach the parts that need lubrication, discharge the excess gas in the cylinder, or reduce the weight of the piston pin to reduce the inertial force.

[0004] Currently, the drilling of piston pins of air compressors relies on manual operation. Workers fix the piston pins on specific jigs and then hold a drilling gun to drill holes at the target positions of the piston pins. This manual drilling method not only has low drilling efficiency, but also the quality and position of the drilled holes vary unevenly depending on the experience or attention of the workers, resulting in unstable product quality. Summary of the Invention

[0005] The purpose of the present invention is to provide a drilling device for piston pins of air compressors, which can achieve automatic drilling of piston pins of air compressors and improve drilling efficiency.

[0006] The present invention is implemented as follows. A drilling device for piston pins of air compressors includes:

[0007] A fixture for clamping materials,

[0008] A fixture driving mechanism for driving the fixture and the materials thereon to reciprocate along a first direction;

[0009] An automatic feeding mechanism for feeding materials to the fixture;

[0010] A first drilling power head for drilling on one side of the piston pin. The first drilling power head is fixed on the slider of a first lateral driving module, and the first lateral driving module can drive the first drilling power head to reciprocate along a second direction.

[0011] a second drilling head, for drilling a hole on the other side of the piston pin, the second drilling head being fixed to a slider of a second transverse drive module, the second transverse drive module being capable of driving the second drilling head to reciprocate in a second direction; the first direction being perpendicular to the second direction, the first drilling head and the second drilling head being symmetrically distributed along the first direction;

[0012] a third drilling power head, for drilling a hole on one side of the piston pin, wherein the third drilling power head is fixed to a slider of the third transverse drive module, and the third transverse drive module can drive the third drilling power head to reciprocate along the second direction;

[0013] An automatic material ejection mechanism, used to push the material out of the fixture;

[0014] An automatic material receiving mechanism, for receiving the material pushed out from the clamp;

[0015] The controller is used to control the clamp driving mechanism, the automatic feeding mechanism, the first drilling power head, the second drilling power head, the third drilling power head, the automatic material return mechanism and the automatic material receiving mechanism to work according to instructions.

[0016] In some implementations, the clamp includes an upper clamp block, a lower clamp block, and a clamp block opening and closing drive component, the two power output ends of the clamp block opening and closing drive component are respectively connected to the upper clamp block and the lower clamp block, and the clamp block opening and closing drive component can drive the upper clamp block and the lower clamp block to open and close to clamp or release the material; wherein, the bottom of the upper clamp block is provided with an upper arc-shaped groove opening downward, and the top of the lower clamp block is provided with a lower arc-shaped groove opening upward.

[0017] In some implementations, the clamp driving mechanism includes a clamp longitudinal driving member, a clamp longitudinal slide rail, and a clamp longitudinal slide seat. The clamp longitudinal slide seat is slidably set on the clamp longitudinal slide rail. The power output end of the clamp longitudinal driving member is fixedly connected to the clamp longitudinal slide seat. The clamp is fixed on the clamp longitudinal slide seat. When the clamp longitudinal driving member is working, it can drive the clamp to move back and forth along the first direction.

[0018] In some implementations, the fixture drive mechanism further includes a first hole position sensor for positioning the first hole drilling station, a second hole position sensor for positioning the second hole drilling station, a second hole position sensor for positioning the third hole drilling station, and a blanking station sensor for positioning the blanking station.

[0019] In some implementations, the automatic feeding mechanism includes a vibrating bowl, a feeding channel, a material buffer seat, and a feeding pusher; the vibrating bowl is used to arrange the materials neatly and then convey them to the feeding channel in sequence. The feeding channel is inclined with respect to the horizontal plane, and its bottom end is directly above the material buffer seat. The material buffer seat is used to receive the materials from the feeding channel, and the feeding pusher is used to push the materials into the fixture.

[0020] In some implementations, the automatic unloading mechanism includes an unloading pusher and an unloading push rod. A longitudinal hole is formed in the longitudinal sliding seat of the fixture corresponding to the position where the material is clamped. The unloading push rod is coaxially connected to the power output end of the unloading pusher. The unloading pusher can drive the unloading push rod to pass through the longitudinal hole and push the material on the fixture out of the fixture.

[0021] In some implementations, the drilling device further includes a burr trimming mechanism for trimming the burrs inside the hole. The burr trimming mechanism and the automatic unloading mechanism are fixedly arranged on the slider of the fourth lateral driving module at a lateral interval; the fourth lateral driving module can drive the burr trimming mechanism and the automatic unloading mechanism to slide to the position aligned with the fixture at different times respectively.

[0022] In some implementations, the burr trimming mechanism includes a burr trimming rotary motor, a burr trimming drill bit, and a longitudinal driving member for the burr trimming rotary motor; the longitudinal driving member for the burr trimming rotary motor is fixed on the slider of the fourth lateral driving module. The burr trimming drill bit is coaxially connected to the rotating shaft of the burr trimming rotary motor. The longitudinal driving member for the burr trimming rotary motor can drive the burr trimming drill bit to extend into the inner hole of the material, and the burr trimming rotary motor can drive the burr trimming drill bit to rotate to shear the burrs in the inner hole.

[0023] In some implementations, the automatic material receiving mechanism includes a discharging channel, a forward and backward driving member for the discharging channel, and a receiving tray. The discharging channel is inclined with respect to the horizontal plane. The discharging channel is fixedly connected to the power output end of the forward and backward driving member for the discharging channel. The forward and backward driving member for the discharging channel can drive the feeding port of the discharging channel to approach the fixture to receive the material pushed out of the fixture by the automatic unloading mechanism. The receiving tray is located below the discharging port of the discharging channel.

[0024] In some implementations, the drilling aperture of the first drilling power head is the same as that of the second drilling power head, and the drilling aperture of the first drilling power head is different from that of the third drilling power head.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The present invention specifically provides a drilling device for the piston pin of an air compressor. The first drilling power head and the second drilling power head of the drilling device can drill holes on the opposite sides of the piston pin respectively to form through holes; the third drilling power head can drill holes on one side of the piston pin to form blind holes. In the whole processing flow, feeding, material conveying, drilling, unloading and discharging are all realized by an automatic mechanism. Compared with manual drilling, the present invention improves the drilling efficiency and is beneficial to the stability and standardization of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. 6 is a side schematic view of a drilling device provided by an embodiment of the present invention;

[0028] Figure 2 FIG. 10 is a top schematic view of a drilling device provided by an embodiment of the present invention;

[0029] Figure 3 FIG. 14 is a schematic view of a drilled piston pin of an air compressor provided by an embodiment of the present invention;

[0030] Figure 4 FIG. 18 is a schematic view when the fixture clamps the piston pin provided by an embodiment of the present invention;

[0031] Figure 5 FIG. 22 is a schematic view of a piston pin of an air compressor before deburring provided by an embodiment of the present invention;

[0032] Figure 6 FIG. 26 is a schematic view of a deburring drill bit extending into a piston pin of an air compressor provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] In order to make the object, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention; the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; in addition, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The technical solution of the present invention will be further described below in conjunction with the drawings and through specific embodiments.

[0036] Please refer to Figure 1 and Figure 2 , which is a schematic structural diagram of a drilling device for a piston pin of an air compressor provided in this embodiment. The drilling device includes a machine table 100, a fixture 1 arranged on the machine table 100, a fixture driving mechanism, an automatic feeding mechanism, a first drilling power head 21, a second drilling power head 22, a third drilling power head 23, an automatic unloading mechanism, an automatic receiving mechanism, a burr trimming mechanism, and a controller.

[0037] Among them, the fixture 1 is used to clamp the material; the fixture driving mechanism is used to drive the fixture and the material thereon to reciprocate along the first direction; the automatic feeding mechanism is used to convey the material to the fixture 1.

[0038] The first drilling power head 21 is used to drill a hole on one side of the piston pin. The first drilling power head 21 is fixed on the slider of the first lateral driving module 31, and the first lateral driving module 31 can drive the first drilling power head 21 to reciprocate along the second direction.

[0039] The second drilling power head 22 is used to drill a hole on the other side of the piston pin. The second drilling power head 22 is fixed on the slider of the second lateral driving module 32, and the second lateral driving module 32 can drive the second drilling power head to reciprocate along the second direction; the first direction is perpendicular to the second direction, and the first drilling power head 21 and the second drilling power head 22 are symmetrically distributed along the first direction.

[0040] The third drilling power head 23 is used to drill a hole on one side of the piston pin. The third drilling power head 23 is fixed on a slider of the third transverse driving module 33. The third transverse driving module 33 can drive the third drilling power head 23 to move back and forth along the second direction.

[0041] The automatic material ejection mechanism is used to push the material out of the fixture 1.

[0042] The automatic material receiving mechanism is used to receive the material pushed out from the clamp.

[0043] The controller is used to control the fixture drive mechanism, the automatic feeding mechanism, the first drilling power head 21, the second drilling power head 22, the third drilling power head 23, the automatic material return mechanism, the automatic material receiving mechanism, and the burr trimming mechanism to operate according to instructions. It should be noted that the controller can be installed on the device or located outside the device. The controller and the various mechanisms can achieve signal connection via cables or via wireless communication modules such as WiFi and antennas.

[0044] See also Figure 3 Since the material needs to have two holes of the same size drilled at both ends, a blind hole needs to be drilled in the middle, and the size of the blind hole is larger than the size of the hole. Therefore, in this embodiment, the hole diameter of the first drilling power head 21 is the same as the hole diameter of the second drilling power head 22, and the hole diameter of the first drilling power head 21 is different from the hole diameter of the third drilling power head 23.

[0045] For details, please refer to Figure 4 The clamp 1 of this embodiment includes an upper clamping block 11, a lower clamping block 12, and a clamping block opening and closing driver. The two power output terminals of the clamping block opening and closing driver are respectively connected to the upper clamping block 11 and the lower clamping block 12. The clamping block opening and closing driver can drive the upper and lower clamping blocks 11 and 12 to open and close, thereby clamping or loosening the material. The upper clamping block 11 has an upper arc-shaped groove with a downward opening at the bottom, and the lower clamping block 12 has a lower arc-shaped groove with an upward opening at the top. It should be noted that when the upper and lower clamping blocks 11 and 12 clamp the material, space is reserved on the left and right sides for the drill bit of the drilling power head to enter.

[0046] Specifically, the clamp driving mechanism of this embodiment includes a clamp longitudinal driving member, a clamp longitudinal slide rail 41 and a clamp longitudinal slide 42. The clamp longitudinal slide 42 is slidably set on the clamp longitudinal slide rail 41. The power output end of the clamp longitudinal driving member is fixedly connected to the clamp longitudinal slide 42. The clamp 1 is fixed on the clamp longitudinal slide 42. When the clamp longitudinal driving member is working, it can drive the clamp 1 to move back and forth along the first direction.

[0047] Furthermore, the fixture driving mechanism of this embodiment further includes a first hole position sensor for positioning the first hole drilling station, a second hole position sensor for positioning the second hole drilling station, a second hole position sensor for positioning the third hole drilling station, and a blanking station sensor for positioning the blanking station. In practical applications, the above-mentioned sensors for positioning can use photoelectric opposed sensors or touch sensors and other sensors that can determine positions.

[0048] Specifically, the automatic feeding mechanism of this embodiment includes a vibrating bowl, a feeding channel 51, a material buffer seat 52, and a feeding pusher 53; the vibrating bowl is used to arrange the materials neatly and then convey them to the feeding channel 51 in sequence. The feeding channel 51 is inclined to the horizontal plane, and its bottom end is directly above the material buffer seat 52. The material buffer seat 52 is used to receive the materials from the feeding channel, and the feeding pusher 53 is used to push the materials into the fixture 1.

[0049] Specifically, the automatic material discharging mechanism of this embodiment includes a material discharging pusher 61 and a material discharging push rod 62. A longitudinal hole is opened on the fixture longitudinal slide 42 corresponding to the position where the material is clamped. The material discharging push rod 62 is coaxially connected to the power output end of the material discharging pusher 61. The material discharging pusher 61 can drive the material discharging push rod 62 to pass through the longitudinal hole and push the material on the fixture 1 out of the fixture 1.

[0050] The burr trimming mechanism and the automatic material discharging mechanism are fixed transversely and spaced apart on the slider of the fourth transverse driving module (not shown in the figure); the fourth transverse driving module can drive the burr trimming mechanism and the automatic material discharging mechanism to slide to the position aligned with the fixture at different times respectively.

[0051] Specifically, please refer to Figure 5 and Figure 6 The burr trimming mechanism of this embodiment includes a burr trimming rotary motor, a burr trimming drill bit 7, and a burr trimming rotary motor longitudinal driving member. The burr trimming rotary motor longitudinal driving member is fixed on the slider of the fourth transverse driving module, and the burr trimming drill bit 7 is coaxially connected to the rotating shaft of the burr trimming rotary motor. The burr trimming rotary motor longitudinal driving member can drive the burr trimming drill bit 7 to extend into the inner hole of the material, and the burr trimming rotary motor can drive the burr trimming drill bit to rotate to shear the burrs in the inner hole.

[0052] Specifically, the automatic material receiving mechanism of this embodiment includes a discharging channel 81, a discharging channel advancing and retreating driving member, and a receiving tray 82. The discharging channel 81 is inclined to the horizontal plane. The discharging channel 81 is fixedly connected to the power output end of the discharging channel advancing and retreating driving member. The discharging channel advancing and retreating driving member can drive the feeding port of the discharging channel 81 to approach the fixture 1 to receive the material pushed out of the fixture 1 by the automatic material discharging mechanism. The receiving tray 82 is located below the discharging port of the discharging channel 81.

[0053] The drilling process of the drilling equipment in this embodiment is as follows:

[0054] The vibrating disk starts, arranges the materials regularly, and the materials enter the feeding channel 51 one by one and slide down to the material buffer seat;

[0055] The feeding pusher 53 starts, pushes the material from the material buffer seat 52 into the lower arc groove of the lower clamp block 12, and the clamp block opening and closing drive member works to drive the upper clamp block 11 and the lower clamp block 12 to close to clamp the material;

[0056] The fixture drive mechanism starts, drives the fixture to move in the first direction until the material is aligned with the first perforation drilling position; after the first lateral drive module 31 and the second lateral drive module 32 respectively drive the first drilling power head 21 and the second drilling power head 22 located on both sides of the material to move towards the material to the set position, the first drilling power head 21 and the second drilling power head 22 start to work and drill on both sides of the material to form the first perforation;

[0057] The first lateral drive module 31 and the second lateral drive module 32 respectively drive the first drilling power head 21 and the second drilling power head 22 to move a certain distance away from the material direction, the fixture drive mechanism starts again, drives the fixture 1 to move in the first direction until the material is aligned with the second perforation drilling position; after the first lateral drive module 31 and the second lateral drive module 32 respectively drive the first drilling power head 21 and the second drilling power head 22 located on both sides of the material to move towards the material to the set position again, the first drilling power head 21 and the second drilling power head 22 start to work again and drill on both sides of the material to form the second perforation; the first lateral drive module 31 and the second lateral drive module 32 respectively drive the first drilling power head 21 and the second drilling power head 22 to move a certain distance away from the material direction again;

[0058] The fixture drive mechanism starts again, drives the fixture 1 to move in the first direction until the material is aligned with the blind hole drilling position; after the third lateral drive module 33 drives the third drilling power head 23 located on one side of the material to move towards the material to the set position, the third drilling power head 23 starts to work and drills on one side of the material to form the blind hole; subsequently, the third lateral drive module 33 drives the third drilling power head 23 to move a certain distance away from the material direction again;

[0059] The burr trimming rotary motor longitudinal drive member and the burr trimming rotary motor start together, the burr trimming rotary motor longitudinal drive member drives the burr trimming rotary motor to move in the first direction, and while the burr trimming drill bit 7 rotates, it slowly enters the inner hole of the material to trim the burrs in the inner hole of the material;

[0060] The material discharging pusher 61 is activated to drive the material discharging push rod 62 to extend into the fixture 1 and push out the material. After the material is pushed out, it slides through the discharging channel 81 and falls into the material receiving tray 82.

[0061] In summary, this embodiment specifically provides a drilling device for the piston pin of an air compressor. The first drilling power head and the second drilling power head of this drilling device can drill holes on the opposite sides of the piston pin respectively to form through holes; the third drilling power head can drill holes on one side of the piston pin to form blind holes. In the whole processing process, feeding, material conveying, drilling, material discharging and discharging are all realized by automatic mechanisms. Compared with manual drilling, the present invention improves the drilling efficiency and is beneficial to the stability and standardization of product quality.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A drilling device for a piston pin of an air compressor, characterized in that, include: Clamps, used to clamp materials, A fixture driving mechanism, for driving the fixture and the material thereon to move back and forth in a first direction; An automatic feeding mechanism, used for conveying materials to the clamp; a first drilling power head, used for drilling a hole on one side of the piston pin, wherein the first drilling power head is fixed to a slider of the first transverse driving module, and the first transverse driving module is capable of driving the first drilling power head to reciprocate in a second direction; a second drilling head, for drilling a hole on the other side of the piston pin, the second drilling head being fixed to a slider of a second transverse drive module, the second transverse drive module being capable of driving the second drilling head to reciprocate in a second direction; the first direction being perpendicular to the second direction, the first drilling head and the second drilling head being symmetrically distributed along the first direction; a third drilling power head, for drilling a hole on one side of the piston pin, wherein the third drilling power head is fixed to a slider of the third transverse drive module, and the third transverse drive module can drive the third drilling power head to reciprocate along the second direction; An automatic material ejection mechanism, used to push the material out of the fixture; An automatic material receiving mechanism, for receiving the material pushed out from the clamp; The controller is used to control the clamp driving mechanism, the automatic feeding mechanism, the first drilling power head, the second drilling power head, the third drilling power head, the automatic material return mechanism and the automatic material receiving mechanism to work according to instructions.

2. The drilling device according to claim 1, wherein, The clamp includes an upper clamping block, a lower clamping block and a clamping block opening and closing driving component. The two power output ends of the clamping block opening and closing driving component are respectively connected to the upper clamping block and the lower clamping block. The clamping block opening and closing driving component can drive the upper clamping block and the lower clamping block to open and close to clamp or loosen the material; wherein, the bottom of the upper clamping block is provided with an upper arc-shaped groove opening downward, and the top of the lower clamping block is provided with a lower arc-shaped groove opening upward.

3. The drilling device according to claim 1, characterized in that, The clamp driving mechanism includes a clamp longitudinal driving member, a clamp longitudinal slide rail and a clamp longitudinal slide. The clamp longitudinal slide is slidably set on the clamp longitudinal slide rail. The power output end of the clamp longitudinal driving member is fixedly connected to the clamp longitudinal slide. The clamp is fixed on the clamp longitudinal slide. When the clamp longitudinal driving member is working, it can drive the clamp to move back and forth along the first direction.

4. The drilling device according to claim 3, characterized in that, The fixture drive mechanism also includes a first hole position sensor for positioning the first hole drilling station, a second hole position sensor for positioning the second hole drilling station, a third hole position sensor for positioning the third hole drilling station, and a blanking station sensor for positioning the blanking station.

5. The drilling device according to claim 3, characterized in that, The automatic feeding mechanism includes a vibration plate, a feed channel, a material buffer seat and a feed pusher; the vibration plate is used to arrange the materials neatly and then transport them to the feed channel in sequence. The feed channel is inclined to the horizontal plane, and its bottom end is located directly above the material buffer seat. The material buffer seat is used to receive the material from the feed channel, and the feed pusher is used to push the material into the clamp.

6. The drilling device according to claim 3, characterized in that, The automatic material discharging mechanism includes a material discharging pusher and a material discharging push rod. A longitudinal hole is formed in the longitudinal sliding seat of the fixture corresponding to the position where the material is clamped. The material discharging push rod is coaxially connected to the power output end of the material discharging pusher. The material discharging pusher can drive the material discharging push rod to pass through the longitudinal hole and push the material on the fixture out of the fixture.

7. The drilling device according to claim 6, characterized in that, It further includes a burr trimming mechanism for trimming the burrs in the hole. The burr trimming mechanism and the automatic material discharging mechanism are fixedly arranged on the slider of the fourth transverse driving module at a transverse interval. The fourth transverse driving module can drive the burr trimming mechanism and the automatic material discharging mechanism to slide to the position aligned with the fixture at different times respectively.

8. The drilling device according to claim 7, characterized in that The burr trimming mechanism includes a burr trimming rotary motor, a burr trimming drill bit and a burr trimming rotary motor longitudinal driving member. The burr trimming rotary motor longitudinal driving member is fixed on the slider of the fourth transverse driving module. The burr trimming drill bit is coaxially connected to the rotating shaft of the burr trimming rotary motor. The burr trimming rotary motor longitudinal driving member can drive the burr trimming drill bit to extend into the inner hole of the material. The burr trimming rotary motor can drive the burr trimming drill bit to rotate to shear the burrs in the inner hole.

9. The drilling device according to claim 1, characterized in that, The automatic material receiving mechanism includes a discharging chute, a discharging chute advancing and retreating driving member and a receiving tray. The discharging chute is inclined to the horizontal plane. The discharging chute is fixedly connected to the power output end of the discharging chute advancing and retreating driving member. The discharging chute advancing and retreating driving member can drive the feeding port of the discharging chute to approach the fixture to receive the material pushed out of the fixture by the automatic material discharging mechanism. The receiving tray is located below the discharging port of the discharging chute.

10. The drilling device according to claim 1, characterized in that, The drilling aperture of the first drilling power head is the same as that of the second drilling power head, and the drilling aperture of the first drilling power head is different from that of the third drilling power head.

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