High branch scissors capable of adjusting angle of working head

Abstract

The utility model discloses a pair of high branch scissors capable of adjusting the angle of a working head, which comprises a handle and the working head rotationally connected to the end part of the handle, an electric angle adjusting mechanism is arranged between the handle and the working head, and the electric angle adjusting mechanism comprises an electric component arranged on the handle and a chuck driven by the electric component to rotate; the chuck and the working head are connected in an embedded mode so as to keep synchronous rotation of the chuck and the working head. The high branch shears have the advantages that the chuck driven by the electric assembly to rotate is arranged, the clamping piece and the working head are connected in an embedded mode, and the problem that existing high branch shears have high requirements for the strength of the connecting position of the working head and the handle is solved. Due to the fact that the chuck is connected with the working head, the limitation of an original transmission shaft on the size can be broken through, the contact area of the chuck and the working head can be increased, and the requirement for the strength of the connecting position of the working head is lowered as long as the strength of the chuck is guaranteed, so that the overall cost of the working head is lowered. And installation and replacement are more convenient.

Description

Technical Field

[0001] The utility model relates to a power tool, in particular to a high branch shear with an adjustable working head angle. Background Art

[0002] A high branch shear is a tool for pruning higher branches such as in orchards, gardens, and vine plants. However, since the branches to be pruned at different positions vary, it is necessary for the working head of our high branch shear to be able to adjust multiple angles accordingly to adapt to the branches at different working conditions and positions for shearing.

[0003] As disclosed in the existing Chinese Patent Publication No. CN219780998U, titled "A Fruit Tree Pruning Device", it uses a worm and worm gear structure to drive a connecting block to rotate relative to a U-shaped plate. Generally, a rotating shaft passes through the worm gear, and the rotating shaft is fixedly connected to the U-shaped plate, thereby driving the U-shaped plate to rotate relatively. Since there is a power part such as a motor in addition to the saw blade on the working head to drive the saw blade to move, due to space limitations, the size of the worm gear will not be too large, which results in the size of the shaft passing through the worm gear not being large either. This poses a high strength requirement for the connection between the connecting block and the shaft. And the connecting block is generally integrally provided with the overall frame of the working head, resulting in an increase in the manufacturing cost of the entire frame. In addition, for the technical solution disclosed in the above patent, in addition to rotating relative to the U-shaped plate, the connecting block also needs to ensure that it does not move axially relative to the U-shaped plate during and after rotation. Therefore, the connecting block will abut against the inner side of the U-shaped plate. When the connecting block rotates, the connecting block directly rubs against the U-shaped plate, which will not only generate noise but also cause an increase in the gap between the two due to long-term wear. Subsequently, problems such as saw blade shaking are likely to occur during use, not only reducing the pruning efficiency but also posing safety risks such as saw blade breakage. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a high branch shear with an adjustable working head angle, which can effectively solve the problem of high strength requirements for the connection between the working head and the handle of the existing high branch shear.

[0005] In order to solve the above technical problems, the utility model is realized through the following technical solutions:

[0006] A high branch shear with an adjustable working head angle includes a handle and a working head rotatably connected to the end of the handle. An electric angle adjustment mechanism is provided between the handle and the working head. The electric angle adjustment mechanism includes an electric component provided on the handle and a chuck driven by the electric component to rotate. The chuck is mutually embedded with the working head to keep the chuck and the working head rotating synchronously.

[0007] In the above high branch shear with an adjustable working head angle, one of the end faces of the chuck and the working head is provided with a plurality of spaced-apart clamping blocks, and the other is provided with clamping grooves adapted to the clamping blocks.

[0008] In the above-mentioned high-branch shear with an adjustable working head angle, the clamping blocks are distributed in an annular array around the rotation axis of the chuck.

[0009] In the above-mentioned high-branch shear with an adjustable working head angle, the working head includes a left housing and a right housing respectively located on the left and right sides of the electric component, and the left housing and the right housing are respectively engaged with a chuck.

[0010] In the above-mentioned high-branch shear with an adjustable working head angle, a transmission shaft is provided between the two chucks, and the electric component drives the transmission shaft to rotate.

[0011] In the above-mentioned high-branch shear with an adjustable working head angle, the handle includes a left handle housing and a right handle housing. An accommodation cavity for the chuck is provided between the left handle housing and the left housing, and an accommodation cavity for the chuck is also provided between the right handle housing and the right housing.

[0012] In the above-mentioned high-branch shear with an adjustable working head angle, a left placement hole is formed on the end face of the left housing facing the left handle housing, and the left handle housing is provided with a left rotating portion extending into the left placement hole. The left placement hole and the left rotating portion form the accommodation cavity, and the outer side wall of the left rotating portion can rotate relative to the inner side wall of the left placement hole; a right placement hole is formed on the end face of the right housing facing the right handle housing, and the right handle housing is provided with a right rotating portion extending into the right placement hole. The right placement hole and the right rotating portion form the accommodation cavity, and the outer side wall of the right rotating portion can rotate relative to the inner side wall of the right placement hole.

[0013] In the above-mentioned high-branch shear with an adjustable working head angle, the rotation axis of the chuck coincides with the rotation axis of the working head relative to the handle.

[0014] In the above-mentioned high-branch shear with an adjustable working head angle, the electric component includes a motor, a worm gear and a worm. The worm is fixedly connected to the output shaft of the motor and rotates coaxially, and the worm gear drives the chuck to rotate.

[0015] In the above-mentioned high-branch shear with an adjustable working head angle, the electric component includes an electric push rod, a rack and a transmission gear. The electric push rod drives the rack to reciprocate along the length direction of the handle, and the transmission gear drives the chuck to rotate.

[0016] Compared with the prior art, the advantages of the present utility model are:

[0017] By setting a chuck driven by an electric component to rotate, and the card is mutually engaged with the working head, the problem that the current high-branch shears have high strength requirements for the connection between the working head and the handle is solved. Since the connection between the chuck and the working head can break through the limitation of the original transmission shaft on the size, the contact area between the chuck and the working head can be increased. As long as the strength of the chuck is ensured, the strength requirement for the connection of the working head can be reduced, so that the overall cost of the working head is reduced, and the chuck and the working head are mutually engaged, which is also more convenient during installation and when replacement is needed. By driving the chuck by the electric component to drive the working head to rotate relative to the handle, the user can adjust the angle of the working head at any time during the pruning process according to the position of the branches to be pruned in a wired or wireless manner, greatly improving the pruning efficiency.

[0018] Furthermore, one of the end face of the chuck and the working head is provided with a plurality of spaced-apart clamping blocks, and the other is provided with a clamping groove adapted to the clamping blocks. By setting the clamping blocks or clamping grooves on the end face of the chuck, the maximum area of the chuck can be fully utilized, and as many clamping blocks or clamping grooves as possible can be set to engage with the working head, and the engagement contact area between the chuck and the working head can be increased as much as possible. When the chuck transmits power to the working head, the force can be dispersed as much as possible, reducing the strength requirement for the contact part between the working head and the chuck.

[0019] Furthermore, the clamping blocks are distributed in an annular array around the rotation axis of the chuck. The annular array can evenly distribute the force on the entire end face of the chuck.

[0020] Furthermore, the working head includes a left housing and a right housing respectively located on the left and right sides of the electric component, and the left housing and the right housing are respectively mutually engaged with a chuck. The two sides of the working head are evenly stressed, which can also ensure that the working head does not deflect during rotation.

[0021] Furthermore, a transmission shaft is provided between the two chucks, and the electric component drives the transmission shaft to rotate. The two chucks are driven to rotate synchronously by the transmission shaft to ensure that the working head does not twist during rotation.

[0022] Furthermore, the handle includes a left handle shell and a right handle shell. An accommodating cavity for accommodating the chuck is provided between the left handle shell and the left housing, and an accommodating cavity for accommodating the chuck is also provided between the right handle shell and the right housing. Through the accommodating cavity formed between the handle shell and the corresponding housing, the chuck can be protected, and it can avoid the influence of debris generated during the operation of the electric component and sundries in the environment on the chuck.

[0023] Further, a left placement hole is formed in the end face of the left housing facing the left handle housing, and a left rotating portion extending into the left placement hole is provided on the left handle housing. The left placement hole and the left rotating portion form the accommodation cavity, and the outer side wall of the left rotating portion can rotate relative to the inner side wall of the left placement hole; a right placement hole is formed in the end face of the right housing facing the right handle housing, and a right rotating portion extending into the right placement hole is provided on the right handle housing. The right placement hole and the right rotating portion form the accommodation cavity, and the outer side wall of the right rotating portion can rotate relative to the inner side wall of the right placement hole. The insertion and cooperation of the rotating portion and the corresponding placement hole not only support the working head when the working head rotates, but also this structure can break through the limitation of the chuck and be made as large as possible to ensure sufficient strength to support the working head. In addition, an accommodation cavity can be formed between the rotating portion and the placement hole to provide space for the setting of the chuck.

[0024] Further, the rotation axis of the chuck coincides with the rotation axis of the working head relative to the handle. The coincidence of the two axes can be directly driven by a transmission shaft, simplifying the structure of the electric component and improving the transmission efficiency.

[0025] Further, the electric component includes a motor, a worm gear and a worm. The worm is fixedly connected to the output shaft of the motor and rotates coaxially, and the worm gear drives the chuck to rotate. The worm gear transmission has a self-locking characteristic, which can lock the angle after the working head rotates to a specified angle to ensure the smooth progress of subsequent pruning work.

[0026] Further, the electric component includes an electric push rod, a rack and a transmission gear. The electric push rod drives the rack to reciprocate along the length direction of the handle, and the transmission gear drives the chuck to rotate. Another structural form of the electric component uses the electric push rod to lock the position and allows the working head to work at the executed angular position. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural view of a high-branch shear with an adjustable working head angle according to the present invention;

[0028] Figure 2 is a cross-sectional view of the connection between the handle and the working head in the present invention;

[0029] Figure 3 is an exploded view of the connection between the handle and the working head in the present invention;

[0030] Figure 4 is a schematic structural view of the chuck in the present invention;

[0031] Figure 5 is a structural view of the left housing in the present invention;

[0032] Figure 6This is a schematic structural diagram of the right handle housing in the present utility model.

[0033] The reference numerals are as follows:

[0034] Handle 100, left handle housing 110, left rotating part 111, right handle housing 120, right rotating part 121;

[0035] Working head 200, chuck 210, left housing 220, left placement hole 221, right housing 230;

[0036] Electric component 300, motor 310, worm gear 320, worm 330, control switch 340;

[0037] Chuck 400, card slot 410, transmission shaft 420;

[0038] Electric saw 500. Detailed implementation manners

[0039] A high-branch shear with an adjustable working head angle includes a handle 100 and a working head 200 rotatably connected to the end of the handle 100. An electric angle adjustment mechanism is provided between the handle 100 and the working head 200. The electric angle adjustment mechanism includes an electric component 300 provided on the handle 100 and a chuck 400 driven by the electric component 300 to rotate. The chuck 400 is mutually engaged with the working head 200 to keep the chuck 400 and the working head 200 rotating synchronously.

[0040] By providing a chuck 400 driven by an electric component 300 and the card being mutually engaged with the working head 200, the problem that the current high-branch shear has high strength requirements for the connection between the working head 200 and the handle 100 is solved. Since the connection between the chuck 400 and the working head 200 can break through the original size limitation of the transmission shaft 420, the contact area between the chuck 400 and the working head 200 can be increased. As long as the strength of the chuck 400 is ensured, the strength requirements for the connection of the working head 200 can be reduced, so that the overall cost of the working head 200 can be reduced, and the chuck 400 and the working head 200 are mutually engaged, which is also more convenient during installation and replacement. The electric component 300 drives the chuck 400 to drive the working head 200 to rotate relative to the handle 100, and the user can adjust the angle of the working head 200 at any time according to the position of the branches to be trimmed during the trimming process, greatly improving the trimming efficiency.

[0041] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation of the present utility model.

[0042] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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, and therefore should not be construed as a limitation to the present utility model.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0044] In the present utility model, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] Refer to Figures 1 to 6 For an embodiment of a high-branch shear with an adjustable working head angle of the present utility model, a high-branch shear with an adjustable working head angle includes a handle 100 and a working head 200 rotatably connected to the end of the handle 100. Generally, the working head 200 is rotatably connected to the top of the handle 100, and a handle can be provided at the bottom of the handle 100 and components such as a battery can be built in. The handle 100 can be a telescopic handle 100 or a handle with a replaceable handle length to facilitate adjusting the length according to the height of the tree branch. The working head 200 includes a saw 500 for trimming tree branches. A control switch for controlling the operation of the saw is provided on the handle 100 or the operation of the saw is controlled by wireless remote control.

[0046] An electric angle adjustment mechanism is provided between the top end of the handle 100 and the working head 200. Through the electric angle adjustment mechanism, the working head 200 can be rotated relative to the handle 100 to a suitable angle, either wired or wirelessly, for pruning branches. The electric angle adjustment structure includes an electric component 300 provided on the handle 100 and a chuck 400 driven by the electric component 300 to rotate. The heavier electric component 300 is arranged on the handle 100 to reduce the pressure at the connection between the working head 200 and the handle 100. The chuck 400 and the working head 200 are mutually engaged to keep the chuck 400 and the working head 200 rotating synchronously.

[0047] For the engagement between the chuck 400 and the working head 200, holes can be provided on the working head 200, the chuck 400 extends into the holes, and the outer periphery of the chuck 400 is engaged with the working head 200. It can also be that the end face of the chuck 400 is engaged with the working head 200, or the circumferential surface and the end face of the chuck 400 are both engaged with the working head 200. In this embodiment, in order to increase the contact surface between the chuck 400 and the working head 200 as much as possible, the rotational power is dispersed, and the local strength of the working head 200 is reduced.

[0048] As Figure 4 、 Figure 5 shown, on one of the end face of the chuck 400 and the working head 200, a plurality of spaced clamping blocks 210 are provided, and on the other, a clamping groove 410 adapted to the clamping blocks 210 is provided. In this embodiment, the clamping groove 410 is provided on the end face of the chuck 400, and the clamping blocks 210 are provided inside the working head 200. The clamping blocks 210 are generally integrally provided with the outer shell of the working head 200. Further, the clamping blocks 210 are distributed in an annular array around the rotation axis of the chuck 400. This not only makes the arrangement of the clamping groove 410 and the clamping blocks 210 more regular, but also facilitates the engagement during assembly, that is, it is convenient to insert the clamping blocks 210 into the clamping grooves 410 during assembly.

[0049] As Figures 3 to 6 shown, on the basis of the above embodiment, in order to make the working head 200 rotate more smoothly and not easily twist, the working head 200 includes a left housing 220 and a right housing 230 respectively located on the left and right sides of the electric component 300. A placement cavity is formed between the left housing 220 and the right housing 230, which can accommodate components such as a saw. The left housing 220 and the right housing 230 are respectively mutually engaged with a chuck 400. In this way, the housings on both sides of the electric component 300 will rotate synchronously, and the driving force for rotating the working head 200 is dispersed to the two housings, reducing the strength requirement for a single-side housing. Further, a transmission shaft 420 is provided between the two chucks 400, and the electric component 300 drives the transmission shaft 420 to rotate, so that the two chucks 400 can rotate synchronously, avoiding torsion when the working head 200 rotates.

[0050] The handle 100 includes a left handle housing 110 and a right handle housing 120. The handle 100 configured in this way is more conducive to manufacturing and can also facilitate the installation of the electric angle adjustment mechanism. The structures of the left handle housing 110 and the right handle housing 120 are symmetrically arranged with respect to a plane perpendicular to the rotation axis of the working head 200. The left handle housing 110 cooperates with the left housing 220, and a receiving cavity for accommodating the chuck 400 is formed therebetween; the right handle housing 120 cooperates with the right housing 230, and a receiving cavity for accommodating the chuck 400 is also formed therebetween. The receiving cavity isolates the chuck 400 from the outside world, preventing powder generated during the operation of the electric angle adjustment mechanism or foreign objects from the outside from affecting the chuck 400.

[0051] A left placement hole 221 is formed in the end face of the left housing 220 facing the left handle housing 110. The left handle housing 110 is provided with a left rotating portion 111 extending into the left placement hole 221. The left placement hole 221 and the left rotating portion 111 form a receiving cavity, and the outer wall of the left rotating portion 111 can rotate relative to the inner wall of the left placement hole 221; a right placement hole is formed in the end face of the right housing 230 facing the right handle housing 120. The right handle housing 120 is provided with a right rotating portion 121 extending into the right placement hole. The right placement hole and the right rotating portion 121 form a receiving cavity, and the outer wall of the right rotating portion 121 can rotate relative to the inner wall of the right placement hole. By the cooperation of the left rotating portion 111 and the left placement hole 221, and the cooperation of the right rotating portion 121 and the right placement hole, a rotating shaft can be formed, and the size of the rotating portion can be made larger, with sufficient strength to support the working head 200 and ensure its stable rotation.

[0052] Based on the above embodiments, the electric component 300 in this embodiment includes a motor 310, a worm gear 320, and a worm 330. The output shaft of the motor 310 is arranged at the top end of the handle 100 along the length direction of the handle 100, so that the space in the length direction of the handle 100 can be fully utilized. The output shaft of the motor 310 is fixedly connected to one end of the worm 330. The worm 330 is rotatably arranged at the top end of the handle 100. The worm 330 is driven to rotate by the motor 310. The worm 330 meshes with the worm gear 320, and the worm gear 320 drives the chuck 400 to rotate, so that the working head 200 rotates relative to the handle 100. The worm gear 320 and the chuck 400 can be connected by a transmission shaft 420 to achieve synchronous rotation. In this way, the rotation axis of the worm gear 320, the rotation axis of the chuck 400, and the rotation axis of the working head 200 relative to the handle 100 coincide. This structure is also the simplest way to arrange the drive component. Of course, an intermediate gear can also be provided on the transmission shaft 420, and the intermediate gear meshes with the worm gear 320. At this time, the rotation axis of the worm gear 320 does not coincide with the rotation axis of the working head 200 relative to the handle 100. The intermediate gear can be used to adjust the rotation ratio between the working head 200 and the worm gear 320. By using the self-locking function of the worm gear 320 and the worm 330, after the electric component 300 drives the chuck 400 to adjust the angle, the current angle of the working head 200 can be locked to ensure the smooth progress of the trimming work.

[0053] In addition to the above structure of the electric component 300, the electric component 300 adopts another structure. The electric component 300 includes an electric push rod, a rack, and a gear. The electric push rod is fixed at the top end of the handle 100, and its reciprocating motion direction is consistent with the length direction of the handle 100. The rack is slidably arranged at the top end of the handle 100. The rack is driven to reciprocate by the electric push rod. The gear meshes with the rack, and the gear drives the chuck 400 to rotate. In the structure of this electric component 300, the connection method between the gear and the chuck 400 is the same as the connection method between the worm gear 320 and the chuck 400. Through the self-locking property of the electric push rod, the current angle of the working head 200 can also be locked.

[0054] The control switch 340 of the electric component 300 can be arranged at the tail end of the handle 100 for the convenience of the user to control. By supplying power to the electric component 300, the chuck 400 is driven to rotate. Since the chuck 400 is mutually engaged with the working head 200, the working head 200 will be driven to rotate relative to the handle 100. In this way, when the angle of the working head 200 needs to be adjusted, there is no need to retract the machine, and the operation is simple and efficient. When working at high altitude, not retracting the machine also reduces the occurrence of danger. In the present utility model, the traditional structure in which the electric component 300 is directly connected to the working head 200 through a rotating shaft is not adopted. Instead, a chuck 400 is added between the transmission shaft 420 and the working head 200. By the mutual engagement between the chuck 400 and the working head 200, the contact area between the chuck 400 and the working head 200 is increased. Compared with the traditional solution, it is not necessary to greatly increase the strength of the working head 200, so that the overall cost of the working head 200 is reduced. Moreover, since the chuck 400 and the working head 200 are mutually engaged, it is more convenient for installation and replacement.

[0055] The above are only specific embodiments of the present utility model, but the technical features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A high-branch shear with an adjustable working head angle, comprising a handle (100) and a working head (200) rotatably connected to the end of the handle (100). An electric angle adjustment mechanism is provided between the handle (100) and the working head (200), and it is characterized in that, The electric angle adjustment mechanism includes an electric component (300) disposed on the handle (100) and a chuck (400) driven by the electric component (300) to rotate. The chuck (400) and the working head (200) are mutually engaged to keep the chuck (400) and the working head (200) rotating synchronously.

2. The high-branch shear with an adjustable working head angle according to claim 1, characterized in that, One of the end face of the chuck (400) and the working head (200) is provided with a plurality of spaced clamping blocks (210), and the other is provided with a clamping groove (410) adapted to the clamping blocks (210).

3. The high branch shears with an adjustable working head angle according to claim 2, characterized in that, The clamping blocks (210) are distributed in an annular array around the rotation axis of the chuck (400).

4. A high-branch shear with an adjustable working head angle according to any one of claims 1 to 3, characterized in that, The working head (200) includes a left housing (220) and a right housing (230) respectively located on the left and right sides of the electric component (300). The left housing (220) and the right housing (230) are respectively mutually engaged with a chuck (400).

5. The high-branch shear with an adjustable working head angle according to claim 4, characterized in that A transmission shaft (420) is provided between the two chucks (400), and the electric component (300) drives the transmission shaft (420) to rotate.

6. The high-branch shear with an adjustable working head angle according to claim 4, characterized in that, The handle (100) includes a left handle shell (110) and a right handle shell (120). An accommodation cavity for accommodating the chuck (400) is provided between the left handle shell (110) and the left housing (220), and an accommodation cavity for accommodating the chuck (400) is also provided between the right handle shell (120) and the right housing (230).

7. The high-branch shear with an adjustable working head angle according to claim 6, characterized in that, The end face of the left housing (220) facing the left handle shell (110) is provided with a left placement hole (221), and the left handle shell (110) is provided with a left rotating part (111) extending into the left placement hole (221). The left placement hole (221) and the left rotating part (111) form the accommodation cavity, and the outer side wall of the left rotating part (111) can rotate relative to the inner side wall of the left placement hole (221); The end face of the right housing (230) facing the right handle shell (120) is provided with a right placement hole, and the right handle shell (120) is provided with a right rotating part (121) extending into the right placement hole. The right placement hole and the right rotating part (121) form the accommodation cavity, and the outer side wall of the right rotating part (121) can rotate relative to the inner side wall of the right placement hole.

8. The high branch shear with an adjustable working head angle according to claim 1, characterized in that, The rotation axis of the chuck (400) coincides with the rotation axis of the working head (200) relative to the handle (100).

9. The high-branch shear with an adjustable working head angle according to claim 1, characterized in that The electric component (300) includes a motor (310), a worm gear (320) and a worm (330). The worm (330) is fixedly connected to the output shaft of the motor (310) and rotates coaxially, and the worm gear (320) drives the chuck (400) to rotate.

10. The high-branch shear with an adjustable working head angle according to claim 1, characterized in that, The electric component (300) includes an electric push rod, a rack and a transmission gear. The electric push rod drives the rack to reciprocate along the length direction of the handle (100), and the transmission gear drives the chuck (400) to rotate.

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