Lawn mower

Abstract

The utility model discloses a mowing machine, relates to the plant cutting technical field, the technical scheme mainly comprises a machine body and an operating rod used for heightening the machine body, the machine body is provided with a gear shifting groove, the operating rod is rotatably connected with the machine body and is limited in the gear shifting groove to carry out gear shifting operation, the machine body is internally provided with a dustproof assembly corresponding to the gear shifting groove, and the dustproof assembly is connected with the operating rod. The dustproof assembly at least comprises a first dustproof plate and a second dustproof plate, the first dustproof plate and the second dustproof plate are connected in a sliding mode, the first dustproof plate is in linkage with the operating rod, and gear shifting operation of the operating rod drives the first dustproof plate and the second dustproof plate to stretch out and draw back relatively so as to shield the gear shifting groove. According to the utility model, the dustproof area can be increased, and the size of the gear shifting groove does not need to be increased additionally.

Description

Technical Field

[0001] The utility model relates to the technical field of plant cutting, in particular to a lawn mower. Background Art

[0002] A lawn mower is a mechanical tool used to trim lawns, vegetation, etc. A blade is installed on the output shaft of the engine. The engine drives the blade to rotate at high speed, and then the lawn can be trimmed. The speed is much higher than that of manpower, which saves the working time of weeding workers and reduces a lot of human resources. In use, in order to achieve different cutting heights, it is necessary to set a height adjustment device on the lawn mower, and adjust the height of the blade through the height adjustment device. The existing height adjustment structure includes a height adjustment baffle, an operating handle and other main structures. A dustproof device needs to be set at the height adjustment baffle of the lawn mower to prevent weeds from affecting the normal use of the structure at the height adjustment baffle.

[0003] Usually, a hard plastic first dustproof plate is added between the shift plate and the fixed surface of the casing. The first dustproof plate can slide freely in the middle. There is a waist-shaped hole on the first dustproof plate, and the operating rod passes through the waist-shaped hole. During the shift adjustment process, the operating rod can drive the dust cover to move back and forth to play a dust-proof role. However, when the gear adjustment range is large, the corresponding first dustproof plate also requires a larger sliding space, so the overall volume of the lawn mower has to be increased, otherwise the dustproof device cannot be arranged. Utility Model Content

[0004] In order to overcome the deficiencies of dust-proof structures in the prior art lawn mowers in actual use, the utility model provides a lawn mower that can increase the dust-proof area without additionally increasing the volume of the shift groove.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a lawn mower, comprising a body and an operating rod for adjusting the height of the body, the body being provided with a shift groove, the operating rod being rotatably connected to the body and being confined in the shift groove for shifting operations, a dustproof component being arranged in the body corresponding to the shift groove, the dustproof component comprising at least a first dustproof plate and a second dustproof plate, the first dustproof plate and the second dustproof plate being slidably connected, the first dustproof plate being linked to the operating rod, and the shifting operation of the operating rod drives the first dustproof plate and the second dustproof plate to extend and retract relative to each other to cover the shift groove.

[0006] After adopting the above technical scheme, the utility model has the following advantages: by slidingly connecting an additional second dustproof plate to the first dustproof plate, when the user performs a gear shifting operation, the operating lever drives the first dustproof plate to slide, while the second dustproof plate expands and contracts relative to the first dustproof plate, thereby changing the dustproof area of ​​the overall dustproof assembly, shielding the portion of the shift slot exposed when the first dustproof plate moves, and providing a dustproof assembly with a variable dustproof area without increasing the shift slot space to cope with different large gear shifting situations.

[0007] Furthermore, the dustproof assembly also includes a third dustproof plate, and the third dustproof plate and the second dustproof plate are respectively slidably connected to both sides of the first dustproof plate. When the operating lever performs a gear shifting operation to drive the first dustproof plate to slide, one of the second dustproof plate and the third dustproof plate shrinks relative to the first dustproof plate, and the other expands relative to the first dustproof plate.

[0008] By adopting the above-mentioned technical solution, when the operating lever shifts gears along one end of the second dustproof plate of the shift slot, the second dustproof plate expands relative to the first dustproof plate in the opposite direction of the shifting to increase the dustproof area of ​​the entire dustproof assembly, while the third dustproof plate on the other side contracts relative to the first dustproof plate, which can reduce the space occupied by the dustproof assembly on the shift slot and does not interfere with other components in the shift slot. When the operating lever shifts gears along the other end of the shift slot, the third dustproof plate expands relative to the first dustproof plate in the opposite direction of the shifting to increase the dustproof area of ​​the entire dustproof assembly, while the second dustproof plate on the other side contracts relative to the first dustproof plate, which can reduce the space occupied by the dustproof assembly on the shift slot.

[0009] Furthermore, the second dustproof plate and the third dustproof plate are both provided with a sliding cavity, and the second dustproof plate and the third dustproof plate are slidably connected to the first dustproof plate through the sliding cavity to realize the expansion and contraction of the second dustproof plate and the third dustproof plate relative to the first dustproof plate.

[0010] By adopting the above-mentioned technical solution, the second dustproof plate and the second slide plate can slide on the first dustproof plate along a fixed path through the sliding cavity to prevent the second dustproof plate and the second slide plate from shifting, so that they can cover the exposed part of the shift groove according to the imagined position.

[0011] Furthermore, an arc-shaped shift plate is provided on the outer surface of the body, the shift groove is provided on the arc-shaped shift plate and extends in an arc, and the dustproof component is close to the inner side of the arc-shaped shift plate and extends and retracts along the arc trajectory of the shift groove.

[0012] By adopting the above-mentioned technical solution, since the shift groove is arranged on the arc-shaped shift plate and extends in an arc, the entire shift groove is an arc-shaped shift groove, and the dustproof assembly slides along the arc trajectory of the shift groove as the operating lever rotates. Under the action of gravity, the second dustproof plate and the third dustproof plate have a tendency to expand outward relative to the first dustproof plate, making it easier for the second dustproof plate and the third dustproof plate to expand relative to the first dustproof plate.

[0013] Furthermore, the second dustproof plate is provided with a first limiting protrusion, and the slide groove is provided with an outwardly protruding second limiting protrusion. When the first limiting protrusion abuts against the second limiting protrusion, the first dustproof plate drives the second dustproof plate to slide along the shift groove.

[0014] By adopting the above-mentioned technical solution, when the first dust shield plate slides, the first limiting protrusion of the second dust shield plate is offset against the second limiting protrusion in the sliding groove, so that the first dust shield plate can drive the second dust shield plate to slide in the shift groove. There is no need to apply additional force to the second dust shield plate, and the function of the second dust shield plate automatically reaching the designated dust protection position can be realized.

[0015] Furthermore, the arc-shaped shift plate includes a fixing assembly, and the arc-shaped shift plate is fixed to the outer periphery of the shift groove through the fixing assembly.

[0016] By adopting the above-mentioned technical solution, the shift plate is fixed to the outer periphery of the shift slot by a fixing component, and the shift plate is fastened to the outer periphery of the shift slot to ensure the stability and accuracy of the shift operation.

[0017] Furthermore, the arc-shaped shift plate is provided with a plurality of shift slots along the length direction.

[0018] By adopting the above-mentioned technical solution, the gear slot on the arc-shaped gear plate can facilitate the user to clamp the operating lever after shifting gears to prevent accidental contact from causing gear changes.

[0019] Furthermore, a blocking member cooperating with the second dustproof plate is also provided in the shift groove. When the blocking member abuts against the second dustproof plate, the blocking member restricts the second dustproof plate from sliding along with the first dustproof plate.

[0020] By adopting the above-mentioned technical solution, the second dustproof plate is limited by the blocking member to prevent the second dustproof plate from sliding excessively following the first dustproof plate, resulting in the second dustproof plate being unable to cover the shift groove, allowing weeds and dust to enter the shift groove.

[0021] Furthermore, the machine body also includes a chassis and a casing, the shift groove is arranged between the chassis and the casing, and an abutment groove is provided on the chassis. When the second dustproof plate slides toward the chassis, the second dustproof plate abuts against the abutment groove to stop the second dustproof plate from sliding and shrink relative to the first dustproof plate part.

[0022] By adopting the above-mentioned technical solution, when a large gear shift is made, the abutment groove can abut against the second dust shield plate to stop the second dust shield plate from sliding. At this time, the first dust shield plate will continue to slide due to the action of the operating lever, and part of the first dust shield plate will overlap with the second dust shield plate, thereby realizing the storage function of the second dust shield plate and preventing the second dust shield plate from interfering with the internal components of the gear shift groove.

[0023] Furthermore, a positioning hole is provided on the first dustproof plate, and the operating rod part passes through the positioning hole and is arranged on the outer surface of the casing.

[0024] By adopting the above-mentioned technical solution, the operating rod part passes through the positioning hole so that the first dustproof plate can slide by moving the operating rod; and the user can directly see the height adjustment structure. Since the height adjustment structure is relatively simple, the user knows how to use it after seeing the structure without special instructions, which is convenient for the user to operate and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings:

[0026] Figure 1 This is an exploded schematic diagram of a partial structure inside a shift slot of a lawn mower according to the utility model;

[0027] Figure 2 Schematic diagram of the structure of the first dustproof plate and the second dustproof plate;

[0028] Figure 3 for Figure 2 A magnified schematic diagram;

[0029] Figure 4 This is a schematic diagram of the retracted structure of the second dustproof plate;

[0030] Figure 5 This is a schematic diagram of the second dustproof plate opening structure;

[0031] Figure 6 It is a schematic diagram of the half-section structure of the shift groove (I);

[0032] Figure 7 It is a schematic diagram of the half-section structure of the shift groove (II);

[0033] In the figure: casing 1, shift slot 11, first dustproof plate 12, slide slot 121, second limiting protrusion 122, second dustproof plate 13, first limiting protrusion 131, sliding cavity 132, blocking member 14, arc-shaped shift plate 15, shift slot 151, positioning hole 16, third dustproof plate 17, chassis 2, abutment slot 21, operating rod 3, operating handle 31. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0035] The terms "first", "second", etc. (if any) in the specification and claims of the present utility model are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish a certain technical feature, it does not necessarily mean that it has "first". It should be understood that in the present utility model, "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. It should be understood that in the present utility model, "multiple" refers to two or more. "And / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0036] The following specific embodiments are used to describe the technical solution of the utility model in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0037] like Figures 1 to 7 As shown, the utility model provides a lawn mower, including a body and an operating rod 3 for adjusting the height of the body, a shift groove 11 is provided on the body, the operating rod 3 is rotatably connected to the body and is confined in the shift groove 11 for shifting operations, a dustproof component is arranged in the body corresponding to the shift groove 11, the dustproof component includes at least a first dustproof plate 12 and a second dustproof plate 13, the first dustproof plate 12 and the second dustproof plate 13 are slidably connected, the first dustproof plate 12 is linked to the operating rod 3, and the shifting operation of the operating rod 3 drives the first dustproof plate 12 and the second dustproof plate 13 to extend and retract relative to each other to cover the shift groove.

[0038] The utility model has an additional second dustproof plate 13 slidably connected to the first dustproof plate 12, so that when the user performs a gear shifting operation, the operating rod 3 drives the first dustproof plate 12 to slide, and the second dustproof plate 13 is extended and retracted relative to the first dustproof plate 12, thereby changing the dustproof area of ​​the overall dustproof assembly and shielding the portion of the gear shifting slot exposed when the first dustproof plate 12 moves. Without increasing the gear shifting slot space, a dustproof assembly with a variable dustproof area is provided to cope with different large gear shifting situations.

[0039] In this embodiment, the dustproof assembly further includes a third dustproof plate 17, and the third dustproof plate 17 and the second dustproof plate 13 are respectively slidably connected to both sides of the first dustproof plate 12. When the operating rod 3 performs a shift operation to drive the first dustproof plate to slide, one of the second dustproof plate 13 and the third dustproof plate 17 shrinks relative to the first dustproof plate 12, and the other expands relative to the first dustproof plate 12. Specifically, when the operating rod 3 performs a shift operation toward the high gear position at the rear end, the operating rod 3 drives the second dustproof plate 13 to expand relative to the first dustproof plate 12 to increase the dustproof area of ​​the entire dustproof assembly, and the third dustproof plate 17 shrinks relative to the first dustproof plate 12, which can reduce the space occupied by the dustproof assembly on the shift groove 11 and does not interfere with other components in the shift groove 11; similar to the above-mentioned high gear shift operation, when the operating rod 3 performs a shift operation toward the low gear position at the front end, the operating rod 3 drives the second dustproof plate 13 to shrink relative to the first dustproof plate 12, and the third dustproof plate 17 expands relative to the first dustproof plate 12.

[0040] In this embodiment, an arc-shaped shift plate 15 is further provided on the outer surface of the body, and the shift groove 11 is arranged on the arc-shaped shift plate and extends in an arc shape. The dustproof component is close to the inner side of the arc-shaped shift plate 15 and extends and retracts along the arc trajectory of the shift groove 11. Since the first dustproof plate 12, the second dustproof plate 13 and the third dustproof plate 17 slide along the arc trajectory of the shift groove 11 as the operating lever 3 rotates, the second dustproof plate 13 and the third dustproof plate 17 have a tendency to expand outward relative to the first dustproof plate 12 under the action of gravity, making it easier for the second dustproof plate 13 and the third dustproof plate 17 to expand relative to the first dustproof plate 12.

[0041] In this embodiment, the arc-shaped shift plate 15 includes a fixing component, and the arc-shaped shift plate 15 is fixed to the outer periphery of the shift groove 11 through the fixing component. The design that the arc-shaped shift plate 15 is fixed to the outer periphery of the shift groove 11 through the fixing component fastens the arc-shaped shift plate 15 to the outer periphery of the shift groove 11, thereby ensuring the stability and accuracy of the shift operation. Among them, the fixing component is a positioning hole and a screw set on both sides of the arc-shaped shift plate 15, and the outer periphery of the shift groove 11 is provided with a corresponding screw hole, and the screw passes through the positioning hole of the arc-shaped shift plate 15 and cooperates with the screw hole of the shift groove 11 to form a fastened connection. It can be understood that in other embodiments, the arc-shaped shift plate 15 can also be integrally formed with the outer periphery of the shift groove 11, or the arc-shaped shift plate 15 and the outer periphery of the shift groove 11 are connected by welding.

[0042] Specifically, the arc-shaped shift plate 15 passes through the operating rod 3 and is arranged above the first dustproof plate 12. The arc-shaped shift plate 15 is provided with seven shift slots 151 along the length direction. The shift slots 151 on the arc-shaped shift plate 15 can facilitate the user to clamp the operating rod 3 after shifting gears to prevent accidental contact from causing gear change.

[0043] Among them, the diameter of the operating rod 3 on the first dustproof plate 12 is the width of the positioning hole 16. When shifting gears, the operating rod 3 can move in the positioning hole 16 in the width direction of the positioning hole so as to be inserted into the gear slot 151. The operating rod 3 partially passes through the positioning hole 16 and is arranged on the outer surface of the casing 1; the operating rod 3 partially passes through the positioning hole 16 so that the first dustproof plate 12 can slide through the movement of the operating rod 3; and the user can directly see the height adjustment structure. Since the height adjustment structure is relatively simple, the user knows how to use it when seeing the structure, and no special instructions are required, which is convenient for the user to operate and use.

[0044] Specifically, the operating rod 3 further includes an operating handle 31, and the operating handle 31 is located above the arc-shaped shift plate 15. The user can operate the operating rod 3 through the operating handle 31 to perform a shift operation, thereby improving the user's experience.

[0045] In the prior art, in order to ensure that the dustproof plate made of a single piece of hard plastic can completely cover the gear slot during a large gear shift, the complete shielding effect is achieved by increasing the length of the dustproof plate. However, since the increased length of the dustproof plate will cause conflict or interference with the components in the gear shift slot, it is necessary to increase the space of the gear shift slot, which increases the volume of the entire lawn mower and increases the production cost. At the same time, the user also needs a larger space to place the lawn mower. In this embodiment, since the second dustproof plate 13 and the third dustproof plate 17 can be retracted relative to the first dustproof plate 12, when the gear is shifted significantly, the dustproof area can be expanded by expanding the second dustproof plate 13 on one side and reducing the occupancy rate of the internal space of the gear shift slot on the other side by contracting the third dustproof plate 17, or the third dustproof plate 17 can be expanded and contracted while the second dustproof plate 13 can be contracted to achieve the same effect, thereby achieving a larger dustproof area with a small occupancy rate of the gear shift slot space.

[0046] Specifically, the shift slot 11 is also provided with two blocking members 14 that cooperate with the second dustproof plate 13 and the third dustproof plate 17. The two blocking members 14 are arranged at the edges of the notches on the left and right sides of the shift slot 11, and do not interfere with the first dustproof plate 12. Taking the second dustproof plate 13 as an example, when the second dustproof plate 13 slides in the limiting direction of the blocking member 14 and cooperates with the blocking member 14, the blocking member 14 abuts against the second dustproof plate 13 and prevents the second dustproof plate 13 from sliding in the limiting direction; the second dustproof plate 13 is limited by the blocking member 14 to prevent the second dustproof plate 13 from sliding with the first dustproof plate 12 and being unable to stop the movement, resulting in the shift slot being partially exposed, causing weeds to enter the shift slot 11. The blocking member 14 can be a relatively small convex column or a card point installed near the notch.

[0047] In this embodiment, a sliding cavity 132 is provided on the second dustproof plate 13 and the third dustproof plate 17. Taking the second dustproof plate 13 as an example, the second dustproof plate is slidably connected to the first dustproof plate 12 through the sliding cavity 132 to achieve relative extension and retraction of the first dustproof plate 12 and the second dustproof plate 13; the second dustproof plate 13 can slide on the first dustproof plate 12 along a fixed path through the sliding cavity 132 to prevent the second dustproof plate 13 from shifting, so that it can cover the exposed part of the shift groove 11 according to the assumed position.

[0048] In another embodiment, taking the second dustproof plate 13 as an example, the sliding cavity is arranged on the first dustproof plate 12, the thickness and width of the second dustproof plate 13 are smaller than those of the first dustproof plate 12, and the second dustproof plate 13 is slidably arranged in the sliding cavity of the first dustproof plate 12, and the cavity mouth of the sliding cavity is provided with a protrusion to prevent the second dustproof plate 3 from completely slipping out of the sliding cavity, and the rear end of the second dustproof plate is relatively provided with a boss that cooperates with the protrusion. When the protrusion and the boss are against each other, the second dustproof plate 13 reaches the maximum extension value on the first dustproof plate 12 to cover the gear slot.

[0049] Specifically, a first limiting protrusion 131 is provided in the sliding cavity of the second dustproof plate 13, and an outwardly protruding second limiting protrusion 122 is provided in the sliding groove 121. When the first limiting protrusion 131 abuts against the second limiting protrusion 122, the first dustproof plate 12 drives the second dustproof plate 13 to slide along the shift groove 11. When the first dustproof plate 12 slides, the first limiting protrusion 131 of the second dustproof plate 13 abuts against the second limiting protrusion 122 in the sliding groove 121, so that the first dustproof plate 12 can drive the second dustproof plate 13 to slide in the shift groove 11, and the function of the second dustproof plate 13 automatically reaching the designated dustproof position can be realized without applying additional force to the second dustproof plate 13; in this embodiment, the first limiting protrusion 131 is a barb design, that is, the raised parts of the first limiting protrusion 131 and the second limiting protrusion 122 are buckled inwardly, and cooperate with each other to form a snap connection, so that the first dustproof plate 12 can drive the second dustproof plate 13 to slide.

[0050] In this embodiment, the machine body also includes a chassis 2 and a housing 1. The shift groove 11 is arranged between the chassis 2 and the housing 1. The chassis 2 is provided with an abutment groove 21. Taking the second dustproof plate 13 as an example, when the second dustproof plate 13 slides toward the chassis 2, the second dustproof plate 13 abuts against the abutment groove 21 to stop the second dustproof plate 13 from sliding and partially overlap with the first dustproof plate 12. The specific process is: when the gear is shifted significantly, the abutment groove 21 can abut against the second dustproof plate 13 to stop the second dustproof plate 13 from sliding. At this time, the first dustproof plate 12 will continue to slide due to the action of the operating rod 3, and part of the first dustproof plate 12 will overlap with the second dustproof plate 13, realizing the storage function of the second dustproof plate 13 and preventing the second dustproof plate 13 from interfering with the internal components of the shift groove 11.

[0051] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A lawn mower, comprising a machine body and an operating rod for adjusting the height of the machine body, wherein the machine body is provided with a shifting groove, the operating rod is rotatably connected to the machine body and is confined in the shifting groove for shifting operation, and a dustproof component is provided in the machine body corresponding to the shifting groove, characterized in that: The dustproof assembly includes at least a first dustproof plate and a second dustproof plate, the first dustproof plate and the second dustproof plate are slidably connected, the first dustproof plate is linked to the operating rod, and the shifting operation of the operating rod drives the first dustproof plate and the second dustproof plate to extend and retract relative to each other to cover the shift groove.

2. A lawn mower according to claim 1, characterized in that: The dustproof assembly also includes a third dustproof plate, and the third dustproof plate and the second dustproof plate are respectively slidably connected to both sides of the first dustproof plate. When the operating lever performs a gear shifting operation to drive the first dustproof plate to slide, one of the second dustproof plate and the third dustproof plate shrinks relative to the first dustproof plate, and the other expands relative to the first dustproof plate.

3. A lawn mower according to claim 2, characterized in that: The second dustproof plate and the third dustproof plate are both provided with a sliding cavity, and the second dustproof plate and the third dustproof plate are slidably connected with the first dustproof plate through the sliding cavity to realize the expansion and contraction of the second dustproof plate and the third dustproof plate relative to the first dustproof plate.

4. A lawn mower according to claim 2, characterized in that: The outer surface of the body is also provided with an arc-shaped shift plate, the shift groove is arranged on the arc-shaped shift plate and extends in an arc, and the dustproof component is close to the inner side of the arc-shaped shift plate and extends and retracts in accordance with the arc trajectory of the shift groove.

5. A lawn mower according to claim 3, characterized in that: The second dustproof plate is provided with a first limiting protrusion, and the first dustproof plate is also provided with a sliding groove, and the sliding groove is provided with an outwardly protruding second limiting protrusion. When the first limiting protrusion abuts against the second limiting protrusion, the first dustproof plate drives the second dustproof plate to slide along the shift groove.

6. A lawn mower according to claim 4, characterized in that: The arc-shaped shift plate comprises a fixing assembly, and the arc-shaped shift plate is fixed to the outer periphery of the shift groove through the fixing assembly.

7. A lawn mower according to claim 6, characterized in that: The arc-shaped shift plate is provided with a plurality of shift slots along the length direction.

8. A lawn mower according to claim 1, characterized in that: A blocking member cooperating with the second dustproof plate is also provided in the shift groove. When the blocking member abuts against the second dustproof plate, the blocking member restricts the second dustproof plate from sliding along with the first dustproof plate.

9. A lawn mower according to claim 1, characterized in that: The machine body also includes a chassis and a casing, the shift groove is arranged between the chassis and the casing, and an abutment groove is provided on the chassis. When the second dustproof plate slides toward the chassis, the second dustproof plate abuts against the abutment groove to stop the second dustproof plate from sliding and shrink relative to the first dustproof plate.

10. A lawn mower according to claim 9, characterized in that: The first dustproof plate is provided with a positioning hole, and the operating rod part passes through the positioning hole and is arranged on the outer surface of the casing.

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