CN115008390B - A sliding edge screw removal tool - Google Patents

Abstract

The application provides a sliding edge screw disassembling tool which comprises an inner cutter bar, an outer cutter bar, a screw fixer and a torsion sensing system; the screw fixer comprises a main force gear disc, a chassis with a groove and a gear cutter head; the bottom surface of the main force gear plate is provided with a spiral bulge, and the bottom plate with the groove is tightly attached to the bottom surface of the main force gear plate; the gear cutter head is of an arch-shaped structure with one sharp end, grooves are formed in the outer wall of the arched side of the gear cutter head at intervals, and the grooves are meshed with the spiral protrusions; through rotating the main force toothed disc in order to utilize the screw thread to move the direction removal of drive gear tool bit towards trough of belt chassis center, make gear tool bit's most advanced final nut one side of inserting, gear tool bit is equipped with a plurality ofly, and a plurality of gear tool bits act on simultaneously, realize firm centre gripping nut, dismantle the torsion of screw after the centre gripping and provide by gear tool bit completely, can effectively dismantle smooth arris screw, and interior cutter arbor can provide torsion for dismantling the screw jointly with gear tool bit.

Description

A sliding edge screw removal tool

Technical field

The present application relates to the field of hardware tools, specifically a sliding edge screw removal tool.

Background technique

The statements herein merely provide background information relevant to the present application and do not necessarily constitute prior art.

When rotating the electric energy meter, it is necessary to replace the electric energy meter on site. The original fixing screws need to be removed to remove the electric energy meter. However, due to the long operating life of the electric energy meter and insufficient anti-rust work, it is common for electric energy meter screws to be corroded. After the screws are corroded, the strength of the nut decreases significantly. , when disassembling a conventional screwdriver, the nut is prone to slipping, causing the screwdriver head to be unable to engage the nut, making it difficult to remove the screw;

If you encounter slippage during on-site meter replacement, you usually cut off the tail wire of the energy meter and remove the meter and part of the wires as a whole. However, when the meter is reconnected after the wires are cut, the wires become shorter, which causes great difficulties in installing the new meter. ; However, existing sliding edge screw removal tools have problems such as long preparation time and poor removal effect.

Contents of the invention

In order to solve the shortcomings of the existing technology, this application fully considers the actual situation of removing the sliding edge screws and provides a sliding edge screw removal tool that can stably clamp the sliding edge screws and provide sufficient torque for removing the screws.

In order to achieve the above purpose, the technical solution of this application is:

A sliding edge screw removal tool, including an inner cutter shank, an outer cutter shank, and a screw holder; the inner cutter shank includes a handle, a rod body, and a cutter head. The rod body has one end fixed to the handle and the other end connected to the cutter head. Rectangular cross-section rod; the projection of the cutter head along the central axis of the rod body is contained within the rectangular cross-section of the rod body; the outer cutter rod is a hollow circular rod with both ends open, and the outer cutter rod is sleeved on the outside of the rod body; the screw The holder includes a holder shell, which is a cylinder with both ends open. A top cap is installed on one open end of the holder shell, and the end of the outer cutter bar facing the cutter head is connected to the top cap.

Further, a ratchet is provided on the side wall of the rod body; a paddle is provided on the inner wall of the outer knife rod, and the paddle is used to lock the rotational freedom of the ratchet wheel in one direction.

Further, the ratchet is a two-way ratchet.

Further, the screw holder further includes a main gear plate; the main gear plate is stored inside the holder shell and can rotate relative to the holder shell; the main gear plate has a gear plate passage for the rod body to pass through. hole; the gear plate through hole is a rectangular cross-section through hole, and the main gear plate realizes rotational linkage with the rod body through the gear plate through hole.

Further, it also includes a slotted chassis and a gear cutter head; the slotted chassis is fixed on the open end of the holder shell away from the top cap, and the slotted chassis is in contact with the main gear plate; the slotted chassis and the holder shell jointly surround forming a space for accommodating the main gear plate; the grooved chassis is provided with a chassis through hole, the chassis through hole is a circular through hole, and the chassis through hole and the gear plate through hole are concentrically arranged;

The gear cutter head has a sharp arched structure at one end, and the outer wall of the arched side of the gear cutter head is provided with grooves at intervals; the grooved chassis has a through groove, and the height of the through groove is smaller than the arch height of the gear cutter head. , the through slot is used to engage the gear cutter head.

Further, the side of the main force gear plate that is in contact with the grooved chassis is provided with a spiral protrusion, and the spiral protrusion can mesh with the groove of the gear cutter head; when the main force gear plate rotates, the gear cutter head rotates in the spiral The gear cutter head moves in the direction of the center of the chassis through hole driven by the shaped protrusion, and the moving direction of the gear cutter head is the same as the pointed end of the gear cutter head.

Further, at least two gear cutter heads are provided; the number of slots in the grooved chassis is the same as the number of gear cutter heads.

Further, the outer cutter bar also includes a grip and an insulating anti-touch cover; the grip is fixed on the outer wall of the outer cutter bar; the insulating anti-touch cover is arranged around the outer wall of the outer cutter bar and is connected with the handle toward the screw. The retainer is attached on one side.

Further, it also includes a torque sensing system, which includes a display screen, a battery compartment, and a torque sensor; the torque sensor is used to monitor the torque data of the inner tool bar, and the torque data is displayed on the display screen; The battery compartment is used to place the battery and provide power for the torque sensing system.

Further, a method of using a sliding edge screw removal tool; the operator holds the handle with one hand, borrows force from the insulating anti-touch cover with his hand, presses the sliding edge screw removal tool against the screw to be removed, and makes the screw The cap passes through the chassis through hole of the slotted chassis; release the paddle and turn the handle of the inner cutter bar to rotate the inner cutter bar together with the main gear plate;

The operator observes the display number. When the display number suddenly increases, stop turning the handle to complete the gear cutter head clamping nut; adjust the pick to engage the pick with the ratchet to achieve synchronization between the outer and inner tool shanks. Turn, turn the handle to remove the screw.

Beneficial effects of the invention

1. This application sets up a main gear plate with a thread at the bottom. By rotating the main gear plate, the thread is used to drive the gear cutter head to move toward the center of the grooved chassis, and the moving direction of the gear cutter head is in line with the sharp end of the gear cutter head. The points are the same, that is, the tip of the gear cutter head moves toward the nut, and the tip is finally inserted into one side of the nut; the gear cutter head is provided with multiple gear cutter heads, and the multiple gear cutter heads work at the same time to achieve firm clamping of the nut. The torque for removing screws is entirely provided by the gear bit, which can effectively remove sliding edge screws.

2. This application is provided with an inner cutter bar with a ratchet and an outer cutter bar with a paddle; the cutter head of the inner cutter shaft is located in the through hole of the main gear plate. When the gear cutter head completes clamping the nut, the inner cutter shank The cutter head of the tool holder engages with the groove on the nut; reverse the inner cutter holder so that the outer cutter holder and the inner cutter holder rotate as a whole under the action of the ratchet, that is, the cutter head of the inner cutter holder and the gear cutter head are screws at the same time. The cap provides torque to avoid the problem of screw slip caused by conventional technology that only provides torque through the screwdriver bit, achieving efficient removal of rusted screws.

3. This application is equipped with a torque sensor for detecting the torque of the inner cutter shank. When the gear cutter head clamps the nut, the torque of the inner cutter shank will increase. The operator can clearly judge whether the current torque can reach the gear through the sensor display. The cutter head firmly clamps the screw, and at the same time prevents excessive torque from breaking the tip of the gear cutter head, significantly improving the efficiency of screw removal and the durability of the device.

4. In this application, the rod body and cutter head of the inner cutter holder are inserted inside the outer cutter holder and the screw holder. The inner cutter holder only needs to be rotated in a certain order to clamp the nut and remove the screw. It has a high degree of integration. Easy to operate features.

Description of drawings

The description and drawings that constitute a part of this application are used to provide a further understanding of this application. The illustrative embodiments and their descriptions of this application are used to explain this application and do not constitute an improper limitation of this application.

Figure 1 is a schematic structural diagram of a sliding edge screw removal tool according to Embodiment 1 of the present application;

Figure 2 is a schematic structural diagram of the screw retainer of the sliding edge screw removal tool according to Embodiment 1 of the present application;

Figure 3 is a schematic structural diagram of the bottom surface of the main gear plate of the sliding edge screw removal tool in Embodiment 1 of the present application;

Figure 4 is a schematic diagram of the cooperation mode between the main gear plate and the gear cutter head of the sliding edge screw removal tool in Embodiment 1 of the present application;

Figure 5 is a schematic diagram of the screw retainer structure assembly of the sliding edge screw removal tool according to Embodiment 1 of the present application;

Figure 6 is a schematic diagram of the working state of the sliding edge screw removal tool according to Embodiment 1 of the present application;

Among them, 1-inner knife arbor, 11-handle, 12-rod body, 13-cutter head, 121-ratchet, 2-outer knife arbor, 21-pick, 22-grip, 23-insulation anti-touch cover, 3- Screw retainer, 31-retainer shell, 32-main gear plate, 33-slotted chassis, 34-gear cutter head, 311-top cap, 321-gear plate through hole, 322-helical protrusion, 331-chassis Through hole, 332-through slot, 341-groove, 4-torque sensing system, 41-display, 42-battery compartment, 43-torque sensor.

Detailed ways

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meanings commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular forms are also intended to include the plural forms unless the context clearly indicates otherwise. Furthermore, it will be understood that when the terms "comprises" and/or "includes" are used in this specification, they indicate There are features, steps, operations, means, components and/or combinations thereof.

In order to enable those skilled in the art to understand the technical solutions of the present application more clearly, the technical solutions of the present application will be described in detail below with reference to specific embodiments.

Example 1

This embodiment discloses a sliding edge screw removal tool. Referring to Figure 1, it includes an inner cutter bar 1, an outer cutter bar 2, and a screw holder 3; the inner cutter bar 1 includes a handle 11, a rod body 12, and a cutter head 13. The rod body 12 is a rectangular cross-section rod with one end fixed to the handle 11 and the other end connected to the cutter head 13; the projection of the cutter head 13 along the central axis of the rod body 12 is included in the rectangular cross-section of the rod body 12; the outer cutter rod 2 is a hollow circular rod with both ends open, and the outer cutter bar 2 is sleeved on the outside of the rod body 12; the screw retainer 3 includes a retainer shell 31, and the retainer shell 31 is a cylinder with both ends open. An open end of the housing 31 is installed with a top cap 311, and the end of the outer cutter bar 2 facing the cutter head 13 is connected to the top cap 311;

Specifically, the handle 11 is an injection molded handle 11, and anti-slip strips are installed on both sides of the handle 11. The anti-slip strips are made of PP material. Of course, the handle 11 can adopt other anti-slip designs, which only need to be convenient for the operator to twist the outer blade. 2 is enough;

The cutter head 13 is detachably connected to the rod body 12. In this embodiment, the cutter head 13 can be replaced to cope with different types of nut grooves 341, such as a straight shape or a cross shape; further, because the cutter head 13 is along the center of the rod body 12 The projection in the axial direction is contained within the rectangular cross section of the rod body 12. When the rod body 12 slides along the central axis in the through hole, the cutter head 13 will not hinder the sliding of the rod body 12.

The outer cutter bar 2 also includes a grip 22 and an insulating anti-touch cover 23; the grip 22 is fixed on the outer wall of the outer cutter bar 2; the insulating anti-touch cover 23 is arranged around the outer wall of the outer cutter bar 2 and is connected with the outer wall of the outer cutter bar 2. The handle 22 is connected to the side facing the screw holder 3;

Specifically, the grip 22 is an injection-molded non-slip insulating grip 22, which is made of PP+TRP material, and can provide good friction feedback when the operator grasps the grip 22; the insulating anti-touch cover 23 It is connected to the handle 22 by welding. When the operator grasps the handle 22, the insulating anti-touch cover 23 can be used to block the sliding of the operator's hand to prevent personnel from getting electric shock.

In this application, a ratchet 121 is provided on the side wall of the rod body 12, and the ratchet 121 is welded to the rod body 12; the inner wall of the outer knife rod 2 is provided with a paddle 21, and the paddle 21 is used to lock the ratchet 121. Rotation freedom in one direction; by setting the ratchet 121 and the paddle 21, when the paddle 21 is not involved in locking, the inner knife bar 1 rotates around the central axis, while the outer knife bar 2 is stationary; when the paddle 21 is involved in locking, The inner cutter bar 1 rotates around the central axis, and the paddle 21 engages with the ratchet 121, causing the inner cutter bar 1 and the outer cutter bar 2 to rotate synchronously;

Furthermore, the ratchet wheel 121 is a bidirectional ratchet wheel 121. The bidirectional ratchet wheel 121 does not have a specific locking direction, so that the outer tool bar 2 can rotate clockwise or counterclockwise around the central axis along with the inner tool bar 1, effectively It is suitable for forward-rotating screws and counter-rotating screws to improve the versatility of this embodiment;

Of course, those skilled in the art can clearly realize that, on the premise that the ratchet 121 does not leave the influence range of the paddle 21, the ratchet 121 can slide to a certain extent along the direction of the central axis of the tool bar, that is, the inner tool bar 1 can slide on the outer tool bar. Limited sliding is performed inside the rod 2; in order to avoid slippage, a stopper can be provided on the inner wall of the outer tool rod 2 to block the sliding of the ratchet wheel 121.

Referring to Figures 2-5, the screw holder 3 also includes a main gear plate 32; the main gear plate 32 is stored inside the holder shell 31 and can rotate relative to the holder shell 31; the main gear plate 32 is opened There is a gear plate through hole 321 for the rod body 12 to pass through; the gear plate through hole 321 is a rectangular cross-section through hole, and the main force gear plate 32 achieves rotational linkage with the rod body 12 through the gear plate through hole 321;

Specifically, the main gear plate 32 is made of CRV chromium vanadium steel, which provides excellent mechanical strength. Of course, other high-hardness wear-resistant materials can also be selected; in this embodiment, the cross-section of the rod body 12 and the gear plate through hole 321 Both are rectangular. When the rod body 12 penetrates the gear plate through hole 321, the two form a form lock, that is, the rotation of the rod body 12 drives the main gear plate 32 to rotate.

It also includes a slotted chassis 33; the slotted chassis 33 is fixed on the open end of the retainer shell 31, and the slotted chassis 33 is in contact with the main gear plate 32; the slotted chassis 33 and the retainer shell 31 together form a space for The space to prevent the main gear plate 32 from coming out of the holder shell 31; the slotted chassis 33 is provided with a chassis through hole 331, the chassis through hole 331 is a circular through hole, and the chassis through hole 331 is concentrically arranged with the gear plate through hole 321 ; The slotted chassis 33 also has a through slot 332, the height of the through slot 332 is less than the arch height of the gear cutter head 34, and the through slot 332 is used to engage the gear cutter head 34;

Specifically, the gear cutter head 34 is made of S2 impact-resistant and vibration-resistant steel. The hardness of this material is higher than that of ordinary nuts, which can ensure that the tip of the gear cutter head 34 penetrates into the nut without collapsing; the gear cutter head 34 It is an arched sheet member with the tip as the center and both sides radiating in two different directions. The outer wall of the arched side of the gear cutter head 34 is provided with grooves 341 at intervals; the grooved chassis 33 is provided with through grooves 332. The height of the through groove 332 is less than the arch height of the gear cutter head 34, and the through groove 332 is used to engage the gear cutter head 34 to lock the rotational freedom of the gear cutter head 34;

The chassis through hole 331 is used for the nut to pass through. After the nut passes through, it is located at the same level as the gear cutter head 34 clamped in the through slot 332. The specific diameter of the chassis through hole 331 can be set by the operator according to the requirements. Removed rusted nut identified.

In order to realize the movement of the gear cutter head 34, the side of the main gear plate 32 in contact with the grooved chassis 33 is provided with a spiral protrusion 322, and the spiral protrusion 322 can mesh with the groove 341 of the gear cutter head 34; when When the main gear plate 32 rotates, the gear cutter head 34 is driven by the spiral protrusion 322 to move toward the center of the chassis through hole 331. The moving direction of the gear cutter head 34 is in the same direction as the sharp end of the gear cutter head 34; because the gear The cutter head 34 is at the same level as the nut. It can be understood that when the gear cutter head 34 moves toward the center of the chassis through hole 331, the tip of the gear cutter head 34 will gradually penetrate into the nut; this embodiment mainly For corroded screws, the surface strength of the nut is significantly reduced after corrosion, so that the tip of the gear cutter head 34 can penetrate smoothly to realize the fitting of the gear cutter head 34 and the screw;

Further, in order to improve the nut-holding effect of the gear cutter heads 34, at least two gear cutter heads 34 are provided; the number of through-slots 332 of the grooved chassis 33 is the same as the number of gear cutter heads 34;

This embodiment provides an arrangement of gear cutter heads 34. A total of three gear cutter heads 34 are provided. The three gear cutter heads 34 are respectively located in the directions of 330°, 120°, and 240° of the grooved chassis; when the main gear plate When 32 rotates, the gear cutter head 34 gradually tightens until it penetrates into the nut, providing a firm clamping effect;

It can be understood that the three gear cutter heads 34 will produce a stroke difference due to the thread distribution during the rotation and tightening process. The stroke difference can be offset by adjusting the length of the gear cutter heads 34 so that the three gear cutter heads 34 contact the nut synchronously. .

It also includes a torque sensing system 4, which includes a display screen 41, a battery compartment 42, and a torque sensor 43; the torque sensor 43 is used to monitor the torque data of the inner tool bar 1, and the torque data is displayed through the display The screen 41 is displayed, and the display screen 41 is made of LED material; the battery compartment 42 is used to place the battery and provide power for the torque sensing system 4;

When the gear cutter head 34 clamps the nut, the torque of the inner cutter bar 1 will increase. The operator can clearly judge through the sensor indication whether the current torque can achieve the goal of the gear cutter head 34 firmly clamping the screw, and at the same time, it can prevent the supply of screws. The tip of the gear cutter head 34 is broken due to excessive torque, which significantly improves the efficiency of screw removal and the durability of the device.

Example 2

This embodiment discloses a method of using a sliding edge screw removal tool; referring to Figure 6, the operator holds the handle 22 with one hand, borrows force from the insulating anti-touch cover 23 with his hand, and presses the sliding edge screw removal tool against the The screws to be removed and the nut passes through the chassis through hole 331 of the slotted chassis 33; release the pick 21 and rotate the handle 11 of the inner knife bar 1 to rotate the inner knife bar 1 together with the main gear plate 32. At this time The outer cutter bar 2 is not linked with the inner cutter bar 1 through the paddle 21, and the outer cutter bar 2 and its connected holder housing 31 have no action; the main gear plate 32 drives the gear cutter head 34 through the thread gradually toward the chassis through hole when rotating. 331 moves in the direction of the center of the circle, that is, the gear cutter head 34 gradually approaches the nut;

The operator observes the number displayed on the display screen 41. When the number displayed on the display screen 41 suddenly increases, the gear cutter head 34 completes the clamping of the nut; stops rotating the handle 11, and adjusts the paddle 21 to engage the paddle 21 with the ratchet 121. , realize the synchronous rotation of the outer knife bar 2 and the inner knife bar 1, because the outer knife bar 2 is connected to the holder shell 31, and the grooved chassis 33 is set on the holder shell 31, that is, the inner knife bar 1 and the grooved chassis 33 Rotate synchronously, and the gear blade, that is, the gear blade, is clamped in the slot 332 of the slotted chassis 33;

When disassembling a screw with a smooth edge, only the gear cutter head 34 is required to clamp the nut, and the gear cutter head 34 is used to directly output torque to the nut, thereby solving the problem that the smooth-edged screw cannot fit with the cutter head 13;

When disassembling the unsmoothed rusted screws, after the gear cutter head 34 is clamped, adjust the inner cutter bar 1 until the cutter head 13 is embedded in the groove 341 of the nut, and turn the handle 11 so that the cutter head 13 and the gear cutter head 34 are in the same position. The nut provides torque to unscrew the corroded screw, thereby avoiding the screw slip problem caused by the conventional technique of only providing torque through the screwdriver bit 13, thereby achieving efficient removal of the corroded screw.

It is understandable that corroded screws are difficult to remove because the rust layer adheres to the inner wall of the screw hole. Once the connection between the rust layer and the screw hole is destroyed, the corroded screw can be easily removed, which means that high torque needs to be applied to the screw in the early stages of disassembly. Breaking through the rust layer connection. When removing the screws with a conventional screwdriver, the resistance of breaking through the rust layer connection is too high, and the nut will be screwed, resulting in slippery edges;

Although the sliding edge screw removal tool in this embodiment uses a gear bit 34 that is separated from the main body, the gear bit 34 has the ability to output high torque in the early stage of screw removal. It only needs to use the gear bit 34 to break through the rust layer. The remaining screw removal stroke can be completely completed by the inner cutter bar 1 or other conventional tools; the separately set cutter head 13 can be quickly replaced for different screws and has strong adaptability.

The above descriptions are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Claims (7)

1. A sliding edge screw removal tool, including an inner cutter shank, an outer cutter shank, and a screw holder; the inner cutter shank includes a handle, a shaft body, and a cutter head. One end of the shaft body is fixed to the handle, and the other end is connected to the cutter head. Connected rectangular cross-section rods; the projection of the cutter head along the central axis of the rod body is contained within the rectangular cross-section of the rod body; the outer cutter rod is a hollow circular rod with both ends open, and the outer cutter rod is sleeved on the outside of the rod body; The screw retainer includes a retainer shell, which is a cylinder with both ends open, a top cap is installed on one open end of the retainer shell, and the end of the outer cutter bar facing the cutter head is connected to the top cap; A ratchet is provided on the side wall of the rod body; a paddle is provided on the inner wall of the outer knife rod, and the paddle is used to lock the rotational freedom of the ratchet wheel in one direction; The screw holder also includes a main gear plate; the main gear plate is stored inside the holder shell and can rotate relative to the holder shell; the main gear plate has a gear plate through hole for the rod body to pass through; The gear plate through hole is a rectangular cross-section through hole, and the main gear plate realizes rotational linkage with the rod body through the gear plate through hole; The screw holder also includes a slotted chassis and a gear cutter head; the slotted chassis is fixed on the open end of the holder shell away from the top cap, and the slotted chassis is in contact with the main gear plate; the slotted chassis is in contact with the holder shell Together they form a space for accommodating the main gear plate; the grooved chassis is provided with a chassis through hole, the chassis through hole is a circular through hole, and the chassis through hole and the gear plate through hole are concentrically arranged; The gear cutter head has a sharp arched structure at one end, and the outer wall of the arched side of the gear cutter head is provided with grooves at intervals; the grooved chassis has a through groove, and the height of the through groove is smaller than the arch height of the gear cutter head. , the through slot is used to engage the gear cutter head. 2. A sliding edge screw removal tool according to claim 1, characterized in that the ratchet wheel is a bidirectional ratchet wheel. 3. A sliding edge screw removal tool as claimed in claim 1, characterized in that the side of the main gear plate in contact with the slotted chassis is provided with a spiral protrusion, and the spiral protrusion can engage with the gear cutter. The groove of the head meshes; when the main gear plate rotates, the gear cutter head moves toward the center of the chassis through hole driven by the spiral protrusion. The moving direction of the gear cutter head is the same as the sharp end of the gear cutter head. 4. A sliding edge screw removal tool as claimed in claim 1, characterized in that at least two gear cutter heads are provided; and the number of slots in the grooved chassis is the same as the number of gear cutter heads. 5. A sliding-edge screw removal tool according to claim 1, wherein the outer cutter bar further includes a grip and an insulating anti-touch cover; the grip is fixed on the outer wall of the outer cutter bar; The insulating anti-touch cover is arranged around the outer wall of the outer tool bar and is connected to the end of the handle facing the screw holder. 6. A sliding edge screw removal tool according to claim 1, characterized in that it also includes a torque sensing system, the torque sensing system includes a display screen, a battery compartment, and a torque sensor; the torque sensor is used for Monitor the torque data of the inner tool holder. 7. A method of using a sliding edge screw removal tool, utilizing the sliding edge screw removal tool according to any one of claims 1 to 6, characterized in that the operator holds the handle with one hand and points his hand toward the insulating anti-touch cover. With the help of force, press the sliding edge screw removal tool against the screw to be removed, and make the nut pass through the chassis through hole of the slotted chassis; adjust the pick to separate the pick from the ratchet, and turn the handle of the inner knife bar. Make the inner cutter bar rotate together with the main gear plate; the operator observes the display number and stops turning the handle when the display number suddenly increases to complete the gear cutter head clamping nut; adjust the pick so that the pick and the ratchet fit , realize the synchronous rotation of the outer knife holder and the inner knife holder, and turn the handle to remove the screw.