Head shell grounding structure and cutting tool

Abstract

The utility model provides a head shell grounding structure and a cutting tool, the head shell grounding structure comprises a main body shell, a head shell and a metal part, one end of the main body shell is provided with a gripping part; the head shell is provided at one end of the main body shell close to the gripping part; the metal part is provided inside one end of the main body shell close to the gripping part, one end of the metal part is in conductive contact with the outer shell wall of the head shell, and the end of the metal part away from the head shell is fixedly provided on the inner shell wall of the main body shell and grounded. The utility model provides a grounded metal part at the part where the gripping part contacts the head shell, when the cutting blade or the shield contacts the live wire, the electricity can be conducted out through the head shell and the metal part, thereby avoiding the problem of damaging the safety of the user, making the user operation safer.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, and in particular to a head shell grounding structure and a cutting tool. Background Art

[0002] At present, the grounding structure in cutting tools such as slotting machines is mostly installed in the stator of the motor to prevent the enameled wire from leaking electricity and causing harm to the user. However, when the cutting tool is working (such as slotting a cement wall), it may cut the live wire. At this time, the metal cutting blade and shield will conduct electricity, which may endanger the safety of the user. Utility Model Content

[0003] The purpose of the embodiments of the utility model is to provide a head shell grounding structure and a cutting tool, aiming to solve the problem that the grounding structure of the existing cutting tool is installed inside the motor, and when the live wire is cut or the shield touches the live wire, it will endanger the safety of the user.

[0004] In order to solve the above technical problems, the embodiment of the utility model provides a head shell grounding structure, including:

[0005] A main body casing, one end of which is provided with a grip portion;

[0006] A head shell, the head shell is arranged at one end of the main housing close to the grip portion;

[0007] A metal piece is arranged inside one end of the main casing close to the holding portion, one end of the metal piece is in conductive contact with the outer shell wall of the head shell, and one end of the metal piece away from the head shell is fixedly arranged on the inner shell wall of the main casing and grounded.

[0008] The utility model provides a grounded metal piece at the part where the grip portion contacts the head shell. When the cutting blade or the shield contacts the live wire, the electricity can be conducted out through the head shell and the metal piece, thereby avoiding the problem of endangering the safety of the user and making the user operation safer.

[0009] Preferably, a first boss is protruding from the outer shell wall of the head shell, and one end of the metal piece abuts against the surface of the first boss.

[0010] Preferably, one end of the metal component is fixedly disposed on the outer shell wall of the head shell through a first screw connection component.

[0011] Preferably, a second boss is protruding from the inner shell wall of the main shell, and one end of the metal piece away from the head shell abuts against the surface of the second boss.

[0012] Preferably, one end of the metal component away from the head shell is fixedly arranged on the inner shell wall of the main shell through a second screw connection component.

[0013] Preferably, a wire is provided in the main housing, and the wire is arranged along the extension direction of the main housing. One end of the metal component away from the head housing is connected to the wire, so that the metal component is grounded through the wire.

[0014] Preferably, a plurality of supporting protrusions are provided on the inner shell wall of the main shell, and the plurality of supporting protrusions are arranged at intervals along the extension direction of the main shell, and each supporting protrusion has a slot for the wire to pass through, and the slot is used to engage with the wire.

[0015] Preferably, a connector is provided at one end of the wire close to the metal part, and the connector abuts against a side of the metal part away from the inner shell wall of the main casing. The connector and the end of the metal part away from the head shell are fixed to the inner shell wall of the main casing through a second screw connection.

[0016] Preferably, the head shell is detachably arranged at one end of the main housing near the gripping portion, and the head shell comprises a first shell wall, a second shell wall and a third shell wall, the first shell wall and the second shell wall are opposite to each other in the extending direction of the gripping portion, the third shell wall is connected to the first shell wall and the second shell wall, and an installation opening is provided through the third shell wall, so that the driving mechanism can be installed into the head shell through the installation opening;

[0017] When the head shell grounding structure is in a normal state, the head shell is located in a first position, one end of the metal part is in conductive contact with the outer shell wall of the first shell wall, and the orientation of the mounting opening is a first orientation, wherein the first orientation is perpendicular to the extension direction of the main shell and the extension direction of the grip portion;

[0018] When the head shell grounding structure is in a reversed state, the head shell is located in a second position, one end of the metal part is in conductive contact with the outer shell wall of the second shell wall, and the orientation of the mounting port is a second orientation, wherein the second orientation is perpendicular to the extension direction of the main body shell and the extension direction of the holding portion, and the second orientation is opposite to the first orientation.

[0019] Preferably, the head shell also includes a fourth shell wall, which is connected to the first shell wall, the second shell wall and the third shell wall. The fourth shell wall is fixed to one end of the main shell near the holding part through a third screw connector, and a plurality of third screw connectors are evenly spaced along the circumference of the fourth shell wall.

[0020] Preferably, the metal piece is a metal sheet.

[0021] In order to achieve the above object, the utility model also provides a cutting tool, including the above head shell grounding structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0023] Figure 1 This is a schematic diagram of the structure of a cutting tool in an embodiment of the utility model;

[0024] Figure 2 for Figure 1 One of the partial structural schematic diagrams of the cutting tool, wherein the head shell grounding structure is in a normal state;

[0025] Figure 3 for Figure 1 The second schematic diagram of the partial structure of the cutting tool, wherein the head shell grounding structure is in a normal state;

[0026] Figure 4 for Figure 1 The third schematic diagram of the partial structure of the cutting tool, wherein the head shell grounding structure is in a reverse installation state;

[0027] Figure 5 for Figure 1 A schematic diagram of the structure of the main body casing;

[0028] Figure 6 for Figure 1 Schematic diagram of the structure of the middle head shell.

[0029] Description of the figures of the utility model:

[0030] Cutting tool 100, main body casing 1, gripping portion 11, second boss 12, supporting protrusion 13, slot 14, auxiliary handle 15, head casing 2, first boss 21, first casing wall 22, second casing wall 23, third casing wall 24, mounting opening 25, fourth casing wall 26, third screw connection 27, metal part 3, metal sheet 3a, first screw connection 31, second screw connection 32, wire 33, connector 34, drive mechanism 4, protective cover 5, cutting blade 6.

[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0035] The utility model provides a head shell grounding structure, which can be used in cutting tools such as slotting machines. The head shell grounding structure used in the slotting machine is used as an example for introduction. Figures 1 to 6 A preferred embodiment of the head shell grounding structure provided by the utility model for use in a cutting tool is shown.

[0036] See also Figures 1 to 3 In this embodiment, the head shell grounding structure includes a main body shell 1, a head shell 2 and a metal part 3.

[0037] See also Figures 1 to 3 A gripping portion 11 is provided at one end of the main housing 1 .

[0038] Specifically, by holding the gripping portion 11 on the main housing 1, the user can push and pull the cutting tool 100 along the extension direction of the main housing 1. The extension direction of the main housing 1 is perpendicular or approximately perpendicular to the extension direction of the gripping portion 11. The extension direction of the main housing 1 is defined as the front-to-back direction, and the extension direction of the gripping portion 11 is defined as the up-down direction. The end of the main housing 1 provided with the gripping portion 11 is the front end of the main housing 1. The gripping portion 11 is arranged upward. By holding the gripping portion 11, the user can push and pull the cutting tool 100 forward and backward.

[0039] Optionally, see Figures 1 to 3 In this embodiment, an auxiliary handle 15 is provided at one end of the main housing 1 away from the grip portion 11. The auxiliary handle 15 is provided upward at the rear end of the main housing 1, so that when the user operates the cutting tool 100, the user can hold the grip portion 11 and the auxiliary handle 15 with both hands, thereby realizing the two-handed operation of the cutting tool 100. The material of the main housing 1 can be an insulating material such as plastic.

[0040] See also Figure 2 , Figure 4 and Figure 6 The head shell 2 is arranged at one end of the main body shell 1 close to the gripping portion 11 .

[0041] Specifically, the head shell 2 is arranged forward at the front end of the main housing 1, and the upper and rear ends of the head shell 2 extend into the main housing 1. A mounting port 25 is arranged through the head shell 2, and the driving mechanism 4 of the cutting tool 100 can be arranged in the head shell 2 from the mounting port 25. A cutting blade 6 is installed on the output shaft of the driving mechanism 4, and a movable shield 5 is installed on the head shell 2. The shield 5 is arranged at one end of the cutting blade 6. The head shell 2, the shield 5, and the cutting blade 6 are usually made of metal. Among them, the direction of the mounting port 25 is usually perpendicular or approximately perpendicular to the extension direction of the main housing 1 and the extension direction of the gripping portion 11. The direction perpendicular to the mounting port 25 is defined as the left and right direction below, and the mounting port 25 is arranged to face left or right.

[0042] See also Figure 2 , Figure 4 and Figure 6 The metal part 3 is arranged inside one end of the main casing 1 close to the gripping portion 11, one end of the metal part 3 is in conductive contact with the outer shell wall of the head shell 2, and the end of the metal part 3 away from the head shell 2 is fixedly arranged on the inner shell wall of the main casing 1 and grounded.

[0043] Specifically, the grounded metal part 3 is arranged at the part where the holding part 11 contacts the head shell 2. The metal part 3 includes a fixed end and a contact end. The fixed end of the metal part 3 is fixedly arranged on the inner shell wall of the main shell 1 and is grounded, while the contact end of the metal part 3 is in conductive contact with the outer shell wall of the head shell 2.

[0044] The contact end of the metal piece 3 is in conductive contact with the outer shell wall of the head shell 2. Figure 2 , Figure 4 and Figure 6 In this embodiment, a first boss 21 is protruding from the outer shell wall of the head shell 2 , and one end of the metal member 3 abuts against the surface of the first boss 21 .

[0045] Specifically, the contact end of the metal part 3 abuts and fits against the surface of the first boss 21. By setting the first boss 21 on the outer shell wall of the head shell 2, a regular plane can be formed on the outer shell wall of the head shell 2 to contact the contact end of the metal part 3, thereby facilitating the formation of effective conductive contact between the contact end of the metal part 3 and the outer shell wall of the head shell 2. The following will take the example of the first boss 21 provided on the outer shell wall of the head shell 2 to abut against the contact end of the metal part 3 as an example.

[0046] Optionally, see Figure 2 , Figure 4 and Figure 6 In this embodiment, one end of the metal component 3 is fixed to the outer shell wall of the head shell 2 through a first screw component 31.

[0047] Specifically, a first through hole is provided at the contact end of the metal part 3, and a first threaded hole is provided on the surface of the first boss 21 corresponding to the first through hole. The tail of the first screw connector 31 passes through the contact end of the metal part 3 from the first through hole and is threadedly connected with the first threaded hole. In this way, the contact end of the metal part 3 is locked on the first boss 21 through the first screw connector 31, thereby avoiding the problem of the contact end of the metal part 3 being detached from the head shell 2.

[0048] The fixed end of the metal part 3 is fixedly arranged on the inner shell wall of the main shell 1. The fixed end of the metal part 3 can be fixedly arranged on the inner shell wall of the main shell 1 by bonding or screwing. Figure 2 , Figure 4 and Figure 5 In this embodiment, one end of the metal component 3 away from the head shell 2 is fixedly disposed on the inner shell wall of the main shell 1 through a second screw component 32 .

[0049] Specifically, a second through hole is provided at the fixed end of the metal component 3, and a second threaded hole is provided on the inner shell wall of the main casing 1 corresponding to the second through hole. The tail of the second screw connector 32 passes through the fixed end of the metal component 3 from the second through hole and is threadedly connected with the second threaded hole. In this way, the fixed end of the metal component 3 is locked on the inner shell wall of the main casing 1 through the second screw connector 32. The following will take the example of the fixed end of the metal component 3 being fixed on the inner shell wall of the main casing 1 through the second screw connector 32 as an example.

[0050] Optionally, see Figure 2, Figure 4 and Figure 5 In this embodiment, a second boss 12 is protrudingly provided on the inner shell wall of the main shell 1 , and one end of the metal member 3 away from the head shell 2 abuts against the surface of the second boss 12 .

[0051] Specifically, the fixed end of the metal component 3 is in contact with the surface of the second boss 12. By providing the second boss 12 on the inner shell wall of the main body case 1, a regular plane can be formed on the inner shell wall of the main body case 1 to contact and fit the fixed end of the metal component 3. A second threaded hole is provided on the surface of the second boss 12, and the fixed end of the metal component 3 is locked on the second boss 12 by the second screw connection 32.

[0052] The fixed end of the metal part 3 is grounded. Figure 2 and Figure 4 In this embodiment, a wire 33 is provided in the main casing 1 , and the wire 33 is arranged along the extension direction of the main casing 1 . One end of the metal component 3 away from the head casing 2 is connected to the wire 33 so that the metal component 3 is grounded through the wire 33 .

[0053] Specifically, the fixed end of the metal member 3 is grounded via a wire 33 . By providing the wire 33 , it is convenient to connect the metal member 3 to the ground wire of the cutting tool 100 .

[0054] For further information, see Figure 2 and Figure 4 In this embodiment, a plurality of support protrusions 13 are provided on the inner shell wall of the main shell 1, and the plurality of support protrusions 13 are arranged at intervals along the extension direction of the main shell 1, and each support protrusion 13 has a slot 14 for the wire 33 to pass through, and the slot 14 is used to engage with the wire 33.

[0055] Specifically, a support protrusion 13 with a clamping slot 14 is provided in the main housing 1 , and the wires 33 are supported and fixed by a plurality of support protrusions 13 , so that the wires 33 can be arranged in an orderly manner in the main housing 1 .

[0056] Optionally, see Figure 2 and Figure 4 In this embodiment, a connector 34 is provided at one end of the wire 3 close to the metal part 3, and the connector 34 abuts against the side of the inner shell wall of the metal part 3 away from the main casing 1. The connector 34 and the end of the metal part 3 away from the head shell 2 are fixed on the inner shell wall of the main casing 1 through a second screw connector 32.

[0057] Specifically, the second screw connection member 32 passes through the joint 34 and the fixed end of the metal member 3 in sequence, and is threadedly connected with the second threaded hole on the second boss 12, so that the joint 34 and the fixed end of the metal member 3 are locked on the second boss 12 through the second screw connection member 32. The wire 33 is connected to the fixed end of the metal member 3 through the joint 34, so that the wire 33 is connected and fixed to the fixed end of the metal member 3.

[0058] The specific style of the metal part 3 can be set according to the actual situation. Figure 2 , Figure 4 and Figure 6 In this embodiment, the metal member 3 is a metal sheet 3a.

[0059] The utility model provides a grounded metal part 3 at the portion where the gripping portion 11 contacts the head shell 2. When the cutting blade 6 or the shield 5 contacts a live wire, electricity can be conducted away through the head shell 2 and the metal part 3, thereby avoiding problems that endanger user safety and making user operation safer.

[0060] In order to allow the head shell 2 to be rotated and adjusted according to the user's habits, the installation position on the main housing 1 can be adapted to the user's left and right hand operation habits. Figure 2 , Figure 4 and Figure 6 In this embodiment, the head shell 2 is detachably arranged at one end of the main shell 1 near the gripping portion 11, and the head shell 2 includes a first shell wall 22, a second shell wall 23 and a third shell wall 24. The first shell wall 22 and the second shell wall 23 are opposite to each other in the extension direction of the gripping portion 11, and the third shell wall 24 is connected to the first shell wall 22 and the second shell wall 23. An installation port 25 is provided through the third shell wall 24 to allow the driving mechanism 4 to be installed into the head shell 2 from the installation port 25; when the head shell grounding structure is in the upright state, the head shell 2 is located in the first position, and the metal One end of the metal part 3 is in conductive contact with the outer shell wall of the first shell wall 22, and the orientation of the mounting port 25 is a first orientation, wherein the first orientation is perpendicular to the extension direction of the main shell 1 and the extension direction of the holding portion 11; when the head shell grounding structure is in a reversed state, the head shell 2 is located in the second position, one end of the metal part 3 is in conductive contact with the outer shell wall of the second shell wall 23, and the orientation of the mounting port 25 is a second orientation, wherein the second orientation is perpendicular to the extension direction of the main shell 1 and the extension direction of the holding portion 11, and the second orientation is opposite to the first orientation.

[0061] Specifically, the first shell wall 22 and the second shell wall 23 of the head shell 2 are opposite to each other in the vertical direction, and the first shell wall 22 and the second shell wall 23 are perpendicular to the vertical direction, and the first shell wall 22 and the second shell wall 23 are both provided with a first boss 21. The third shell wall 24 of the head shell 2 is perpendicular to the left-right direction, so that the orientation of the mounting opening 25 is leftward or rightward, that is, one of the first orientation and the second orientation is leftward, and the other is rightward. The following description will be based on the first orientation being leftward and the second orientation being rightward as an example.

[0062] When the head shell 2 is located at the first position, the first shell wall 22 is located on the upper side of the second shell wall 23, the contact end of the metal member 3 abuts against the upper side of the first shell wall 22, and the contact end of the metal member 3 is locked on the first boss 21 of the first shell wall 22 by the first screw member 31. The third shell wall 24 and the mounting opening 25 are arranged to face left, and the driving mechanism 4, the shield 5, and the cutting blade 6 can be installed on the head shell 2 from the left side. The installed shield 5 and cutting blade 6 are located on the left side of the gripping portion 11, and the head shell grounding structure is in a normal state.

[0063] When it is necessary to adjust the installation position of the head shell 2 on the main casing 1, after removing the shield 5 and the cutting blade 6, remove the head shell 2 from the main casing 1 and rotate it 180°, install the head shell 2 on the main casing 1 again and lock it with the contact end of the metal part 3. At this time, the head shell 2 is located in the second position, the second shell wall 23 is located on the upper side of the first shell wall 22, the contact end of the metal part 3 abuts against the upper side of the second shell wall 23, and the contact end of the metal part 3 is locked on the first boss 21 of the second shell wall 23 through the first screw member 31. The third shell wall 24 and the installation port 25 are set to face right, and the shield 5 and the cutting blade 6 can be installed on the head shell 2 from the right side. The installed shield 5 and the cutting blade 6 are located on the right side of the gripping portion 11. At this time, the head shell grounding structure is in a reverse installation state.

[0064] After the head shell 2 rotates, the contact end of the metal part 3 can still abut against the outer shell wall of the head shell 2, and the grounding function of the head shell grounding structure is still available without adjusting the position of the metal part 3, thereby making the rotation adjustment operation of the head shell 2 simple and convenient.

[0065] For further information, see Figure 2 , Figure 4 and Figure 6 In the present embodiment, the head shell 2 further includes a fourth shell wall 26, which is connected to the first shell wall 22, the second shell wall 23, and the third shell wall 24. The fourth shell wall 26 is fixed to one end of the main shell 1 close to the gripping portion 11 by a third screw joint 27, and a plurality of third screw joints 27 are evenly spaced along the circumference of the fourth shell wall 26.

[0066] Specifically, the fourth shell wall 26 is the rear shell wall of the head shell 2, and a plurality of third through holes are provided on the fourth shell wall 26 corresponding to the plurality of third screw connectors 27, and a plurality of third threaded holes are provided on the front shell wall of the main shell 1 corresponding to the plurality of third through holes. The tail of each third screw connector 27 passes through the fourth shell wall 26 from a corresponding third through hole and is threadedly connected with a corresponding third threaded hole, so that the head shell 2 can be detachably arranged at the front end of the main shell 1 through the plurality of third screw connectors 27.

[0067] The specific number of the third screw connectors 27 can be set according to actual conditions. Figure 2 , Figure 4 and Figure 6 In the present embodiment, the fourth shell wall 26 is arranged in a quasi-square shape, and four third screw connectors 27 are arranged, and the four third screw connectors 27 are respectively arranged at the four corners of the fourth shell wall 26 .

[0068] The utility model also provides a cutting tool, which can be a slotting machine, etc. The cutting tool includes a head shell grounding structure. Since the head shell grounding structure adopts the technical solution of the above embodiment, it has the beneficial effects brought by the technical solution of the above embodiment. Figures 1 to 6 A preferred embodiment of the cutting tool provided by the utility model is shown.

[0069] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A head shell grounding structure, characterized in that: include: A main body casing, one end of which is provided with a grip portion; A head shell, the head shell is arranged at one end of the main housing close to the grip portion; A metal piece is arranged inside one end of the main casing close to the holding portion, one end of the metal piece is in conductive contact with the outer shell wall of the head shell, and one end of the metal piece away from the head shell is fixedly arranged on the inner shell wall of the main casing and grounded.

2. The head shell grounding structure according to claim 1, characterized in that: A first boss is convexly provided on the outer shell wall of the head shell, and one end of the metal piece abuts against the surface of the first boss; and / or, One end of the metal piece is fixedly arranged on the outer shell wall of the head shell through a first screw connection piece.

3. The head shell grounding structure according to claim 1, characterized in that: A second boss is convexly provided on the inner shell wall of the main shell, and an end of the metal piece away from the head shell abuts against a surface of the second boss; and / or, One end of the metal component away from the head shell is fixedly arranged on the inner shell wall of the main shell through a second screw connection component.

4. The head shell grounding structure according to claim 1, characterized in that: A wire is arranged in the main housing, and the wire is arranged along the extension direction of the main housing. One end of the metal piece away from the head housing is connected to the wire, so that the metal piece is grounded through the wire.

5. The head shell grounding structure according to claim 4, characterized in that: A plurality of supporting protrusions are convexly arranged on the inner shell wall of the main shell, and the plurality of supporting protrusions are arranged at intervals along the extension direction of the main shell. Each supporting protrusion has a slot for the wire to pass through, and the slot is used for engaging with the wire.

6. The head shell grounding structure according to claim 4, characterized in that: A connector is provided at one end of the wire close to the metal part, and the connector abuts against a side of the metal part away from the inner shell wall of the main shell. The connector and the end of the metal part away from the head shell are fixed to the inner shell wall of the main shell through a second screw connector.

7. The head shell grounding structure according to any one of claims 1 to 6, characterized in that: The head shell is detachably arranged at one end of the main housing near the gripping portion, and the head shell comprises a first shell wall, a second shell wall and a third shell wall, the first shell wall and the second shell wall are opposite to each other in the extending direction of the gripping portion, the third shell wall is connected to the first shell wall and the second shell wall, and an installation opening is penetrated through the third shell wall, so that the driving mechanism can be installed into the head shell through the installation opening; When the head shell grounding structure is in a normal state, the head shell is located in a first position, one end of the metal part is in conductive contact with the outer shell wall of the first shell wall, and the orientation of the mounting opening is a first orientation, wherein the first orientation is perpendicular to the extension direction of the main shell and the extension direction of the grip portion; When the head shell grounding structure is in a reversed state, the head shell is located in a second position, one end of the metal part is in conductive contact with the outer shell wall of the second shell wall, and the orientation of the mounting port is a second orientation, wherein the second orientation is perpendicular to the extension direction of the main body shell and the extension direction of the holding portion, and the second orientation is opposite to the first orientation.

8. The head shell grounding structure according to claim 7, characterized in that: The head shell also includes a fourth shell wall, which is connected to the first shell wall, the second shell wall, and the third shell wall. The fourth shell wall is fixed to one end of the main shell near the holding part through a third screw connector, and a plurality of third screw connectors are evenly spaced along the circumference of the fourth shell wall.

9. The head shell grounding structure according to any one of claims 1 to 6, characterized in that: The metal piece is a metal sheet.

10. A cutting tool, characterized in that: It comprises a head shell grounding structure as described in any one of claims 1-9.

Images