Small scarifier power transmission device based on soil resistance feedback

Abstract

The invention discloses a small scarifier power transmission device based on soil resistance feedback, and relates to the technical field of scarifiers, the small scarifier power transmission device comprises a machine shell and a rotating rod rotationally connected between two opposite inner walls of the machine shell, and the side wall of the rotating rod is provided with a plurality of groups of scarifying pieces; the soil loosening device further comprises a driving mechanism arranged on the machine shell and used for driving the soil loosening teeth, the driving mechanism comprises a driving box fixedly connected to the machine shell, the driving box is rotationally connected with a driving rod, and the driving rod is connected with the rotating rod through a transmission assembly. According to the small scarifier power transmission device based on the soil resistance feedback, through the arrangement of the driving mechanism, power transmission of all the scarifying teeth is achieved, and meanwhile by means of the arrangement of the power adjusting assembly, under the cooperation effect of the pushing assembly and the moving assembly, the scarifying teeth can be conveniently adjusted according to the hardness of soil to be scarified; and the rotating speed of each soil loosening tooth is automatically adjusted.

Description

Technical Field

[0001] This invention relates to the field of soil tiller technology, specifically to a small soil tiller power transmission device based on soil resistance feedback. Background Technology

[0002] In agricultural production, home gardening, and greenhouse cultivation, small soil loosening machines have become key equipment for improving soil structure and enhancing crop growing conditions due to their compact size, flexible operation, and adaptability to small plots of farmland. Their core function is to break up the soil and remove compacted layers through loosening components (such as loosening teeth and shovels), providing a loose soil environment for seed germination and root growth. They are currently widely used in small-scale operations such as home gardens, flower nurseries, and facility agriculture.

[0003] However, existing small soil tillers generally use a "fixed transmission ratio" design for their power transmission devices. This means that when the power source transmits power to the soil tillering components through components such as the gearbox and drive shaft, the transmission ratio, output speed, and torque remain constant. This makes it impossible to adaptively adjust to dynamic changes in soil resistance, requiring manual adjustment. For example, when soil resistance increases, operators need to reduce the load on the equipment by slowing down the pushing speed or decreasing the soil tillering depth, or manually switch mechanical gears (some models are equipped with manual transmission mechanisms) to adapt to the resistance changes. However, manual adjustment has a "lag"—operators need to judge the resistance changes by observing the soil tillering effect (such as the degree of soil breakage and equipment vibration) before making adjustments, which can easily lead to missing the optimal adjustment time. At the same time, during long-term operation, operators need to continuously monitor the soil condition and apply pushing force. Especially in high-resistance soil areas, equipment vibration intensifies, and fatigue from holding the handle increases significantly. This does not conform to the development trend of "lightweight and convenient" small agricultural equipment. Therefore, we propose a power transmission device for small soil tillers based on soil resistance feedback. Summary of the Invention

[0004] The purpose of this invention is to provide a small soil loosening machine power transmission device based on soil resistance feedback, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a small soil loosening machine power transmission device based on soil resistance feedback, comprising a housing and a rotating rod rotatably connected between two opposite inner walls of the housing, wherein the side wall of the rotating rod is provided with multiple sets of soil loosening components, each set of soil loosening components is composed of multiple soil loosening teeth arranged in a ring array, and further comprising a drive mechanism disposed in the housing for driving each soil loosening tooth. The drive mechanism includes a drive box fixedly connected to the housing, a drive rod rotatably connected to the drive box, the drive rod being connected to a rotating rod via a transmission assembly, a drive plate being connected to one end of the drive rod via a universal joint, and the end of the drive plate away from the drive rod being connected to the power component of the tractor.

[0006] Preferably, the transmission assembly includes a transmission rod rotatably connected between two opposite inner walls of the drive housing, a transmission disc fixedly connected to the side wall of the transmission rod, a transmission belt sleeved on the transmission disc, a rotating rod connected to the transmission belt via a power adjustment assembly, a control assembly for controlling the tension of the transmission belt in the drive housing, a worm gear fixedly connected to the inner side wall of the drive rod, a worm wheel fixedly connected to the side wall of the transmission rod, and the worm wheel and worm gear meshing with each other.

[0007] Preferably, the power adjustment assembly includes a plurality of arc-shaped plates arranged in a circular array on the periphery of the side wall of the rotating rod. An adjustment plate is fixedly connected to the two opposite side walls of each arc-shaped plate. An adjustment ring is connected to the side wall of the rotating rod through a first guide assembly. The adjustment ring is provided with a pushing assembly for pushing each arc-shaped plate. The drive box is provided with a moving assembly for moving the adjustment ring. One of the two opposite adjustment plates is connected to the inner wall of the drive box through a second guide assembly.

[0008] Preferably, the first guide assembly includes a first guide groove formed on the side wall of the rotating rod, the first guide groove is slidably connected to a first guide plate, and one end of the first guide plate is connected to an arc-shaped plate.

[0009] Preferably, the second guide component includes a second guide groove formed on the side of the adjustment plate away from the arc plate, the second guide groove is slidably connected to a second guide plate, and one end of the second guide plate is connected to the inner wall of the drive box.

[0010] Preferably, the pushing assembly includes two mutually symmetrically arranged pushing plates rotatably connected between the adjusting ring and the arc plate, with the two ends of the two pushing plates respectively hinged to the adjusting ring and the arc plate.

[0011] Preferably, a trencher is provided on the side of the drive box near the drive plate. The trencher is connected to the drive box via a connecting assembly. The connecting assembly includes a connecting plate slidably connected to the side of the drive box near the trencher. Four T-shaped rods are slidably connected to the connecting plate and arranged symmetrically in pairs. One end of each of the four T-shaped rods is connected to the drive box. Connecting springs are sleeved on the side walls of the four T-shaped rods. The two ends of each of the four connecting springs are respectively connected to the connecting plate and the drive box.

[0012] Preferably, the moving component includes a moving plate slidably connected to the drive box near the trencher side, one end of the moving plate being connected to a connecting plate, the other end of the moving plate being located inside the drive box and hinged to a rotating plate, an adjusting ring being rotatably connected to a moving ring on the side of the rotating plate near the rotating plate, and the end of the rotating plate away from the moving plate being hinged to the moving ring.

[0013] Preferably, the control assembly includes two symmetrically arranged control plates disposed within the drive housing, a control rod rotatably connected between the two control plates, a transmission belt slidably connected to the control rod, and a pressing assembly for pressing the control rod within the drive housing.

[0014] Preferably, the extrusion assembly includes an extrusion box fixedly connected to the inner wall of the drive box. An extrusion plate is slidably connected to the side of the extrusion box near the control rod. One end of the extrusion plate is connected to the control plate. The end of the extrusion plate away from the control plate is located inside the extrusion box and is fixedly connected to a sliding plate. An extrusion rod is fixedly connected between two opposing inner walls of the extrusion box. The sliding plate is slidably connected to the extrusion rod. Extrusion springs are sleeved on the side walls of the two extrusion rods. The two ends of the two extrusion springs are respectively connected to the inner wall of the extrusion box and the sliding plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The present invention relates to a small soil loosening machine power transmission device based on soil resistance feedback. Through the setting of the drive mechanism, it realizes power transmission to each loosening tooth. At the same time, through the setting of the power adjustment component, with the cooperation of the push component and the moving component, it is convenient to automatically adjust the rotation speed of each loosening tooth according to the hardness of the soil to be loosened. This reduces the risk of damage to each loosening tooth due to excessive rotation speed when loosening hard soil, while improving the sensitivity and convenience of power adjustment of each loosening tooth during the soil breaking process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the drive mechanism of the present invention; Figure 3 This is a schematic diagram showing the positional relationship between the power adjustment component and the moving component of the present invention; Figure 4 This is a schematic diagram of the structure of the first guide component and the second guide component of the present invention; Figure 5 This is a schematic diagram showing the positional relationship between the pushing component, the adjusting ring, and the arc plate of the present invention; Figure 6 This is a schematic diagram of the extrusion assembly structure of the present invention; Figure 7 for Figure 6 Enlarged view of point A in the middle.

[0017] In the diagram: 101, machine housing; 102, rotating rod; 103, loosening tooth; 201, drive box; 202, drive rod; 203, drive square plate; 301, transmission rod; 302, transmission belt; 303, worm gear; 304, worm wheel; 401, arc plate; 402, adjusting plate; 403, adjusting ring; 501, first guide groove; 502, first guide plate; 601, second guide groove; 602, second guide plate; 7, trencher; 801, connecting plate; 802, T-shaped rod; 803, connecting spring; 901, moving plate; 902, rotating plate; 903, moving ring; 10, push plate; 1101, control plate; 1102, control rod; 1201, extrusion box; 1202, extrusion plate; 1203, sliding plate; 1204, extrusion rod; 1205, extrusion spring. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 Please see Figures 1-7 The diagram shows a small soil loosening machine power transmission device based on soil resistance feedback, including a housing 101 and a rotating rod 102 rotatably connected between two opposite inner walls of the housing 101. The side wall of the rotating rod 102 is provided with multiple sets of loosening components, each set of loosening components is composed of multiple loosening teeth 103 arranged in a ring array, and also includes a drive mechanism provided in the housing 101 for driving each loosening tooth 103. The drive mechanism includes a drive box 201 fixedly connected to the housing 101, a drive rod 202 rotatably connected to the drive box 201, the drive rod 202 being connected to the rotating rod 102 via a transmission assembly, a drive square plate 203 being connected to one end of the drive rod 202 via a universal joint, and the end of the drive square plate 203 away from the drive rod 202 being connected to the power component of the tractor. It should be noted that, through the configuration of the drive mechanism, while power transmission is achieved to each loosening tooth 103, the power adjustment component, in conjunction with the push component and the moving component, facilitates the automatic adjustment of the rotation speed of each loosening tooth 103 according to the hardness of the soil to be loosened. This reduces the risk of damage to each loosening tooth 103 due to excessive rotation speed when loosening hard soil, while improving the sensitivity and convenience of power adjustment for each loosening tooth 103 during soil breaking.

[0020] Please see Figure 2 The transmission assembly shown in the figure includes a transmission rod 301 rotatably connected between two opposing inner walls of the drive box 201. A transmission disc is fixedly connected to the side wall of the transmission rod 301, and a transmission belt 302 is sleeved on the transmission disc. A rotating rod 102 is connected to the transmission belt 302 through a power adjustment assembly. The drive box 201 is provided with a control assembly for controlling the tension of the transmission belt 302. A worm gear 303 is fixedly connected to the inner side wall of the drive rod 202. A worm wheel 304 is fixedly connected to the side wall of the transmission rod 301. The worm wheel 304 and the worm gear 303 are meshed with each other. It should be noted that, through the configuration of the transmission components, as each set of loosening teeth 103 moves on the soil surface, the power component drives the drive plate 203 to rotate. This, in turn, under the transmission action of the universal joint, drives the worm gear 303 on the side wall of the drive rod 202 to rotate. Then, under the meshing transmission action of the worm gear 303 and the worm wheel 304, the transmission disc rotates. Thus, under the transmission action of the transmission belt 302, the rotating rod 102 rotates, which in turn drives each set of loosening teeth 103 to rotate. Therefore, by utilizing the rotation of each set of loosening teeth 103, the soil is broken up, thereby achieving the purpose of loosening the soil.

[0021] Please see Figures 3-5 The power adjustment assembly shown in the figure includes a plurality of arc-shaped plates 401 arranged in a ring array on the periphery of the side wall of the rotating rod 102. An adjustment plate 402 is fixedly connected to the two opposite side walls of each arc plate 401. An adjustment ring 403 is connected to the side wall of the rotating rod 102 through a first guide assembly. The adjustment ring 403 is provided with a pushing assembly for pushing each arc plate 401. The drive box 201 is provided with a moving assembly for moving the adjustment ring 403. One of the two opposite adjustment plates 402 is connected to the inner wall of the drive box 201 through a second guide assembly. It should be noted that: by setting up the power adjustment component, with the cooperation of the pushing component and the moving component, the rotation speed of each loosening tooth 103 can be automatically adjusted according to the hardness of the soil to be loosened. This reduces the risk of damage to each loosening tooth 103 due to excessive rotation speed when loosening hard soil, while improving the sensitivity and convenience of power adjustment of each loosening tooth 103 during the soil breaking process.

[0022] Please see Figure 4 The first guide assembly shown in the figure includes a first guide groove 501 opened on the side wall of the rotating rod 102, and a first guide plate 502 slidably connected to the first guide groove 501. One end of the first guide plate 502 is connected to an arc plate 401. It should be noted here that the first guide component is used to guide and limit the movement of the adjusting ring 403.

[0023] Please see Figure 4 The second guide component shown in the figure includes a second guide groove 601 opened on the side of the adjustment plate 402 away from the arc plate 401. The second guide groove 601 is slidably connected to the second guide plate 602, and one end of the second guide plate 602 is connected to the inner wall of the drive box 201. It should be noted here that the second guide component is used to provide guidance and limit the movement of each arc plate 401.

[0024] Please see Figure 5 The push assembly shown in the figure includes two mutually symmetrically arranged push plates 10 that are rotatably connected between the adjusting ring 403 and the arc plate 401. The two ends of the two push plates 10 are respectively hinged to the adjusting ring 403 and the arc plate 401. It should be noted here that by setting up the push components, it is easy to push the various curved plates 401 to move away from or towards each other.

[0025] Please see Figure 3 The drive box 201 shown in the figure has a trencher 7 on the side near the drive square plate 203. The trencher 7 is connected to the drive box 201 through a connecting assembly. The connecting assembly includes a connecting plate 801 that is slidably connected to the side of the drive box 201 near the trencher 7. The connecting plate 801 is slidably connected to four T-shaped rods 802 that are symmetrically arranged in pairs. One end of the four T-shaped rods 802 is connected to the drive box 201. The side walls of the four T-shaped rods 802 are fitted with connecting springs 803. The two ends of the four connecting springs 803 are respectively connected to the connecting plate 801 and the drive box 201. It should be noted that: by setting up the trencher 7, when the tractor drives the housing 101 to move, it will simultaneously drive the trencher 7 on one side of the drive box 201 to move, thereby realizing the trenching of the loosened soil layer, thus improving the diversity of soil loosening.

[0026] Please see Figure 3 The movable component shown in the figure includes a movable plate 901 slidably connected to the drive box 201 near the trencher 7. One end of the movable plate 901 is connected to the connecting plate 801, and the other end of the movable plate 901 is located inside the drive box 201 and is hinged to a rotating plate 902. An adjusting ring 403 is rotatably connected to a movable ring 903 near the rotating plate 902. The end of the rotating plate 902 away from the movable plate 901 is hinged to the movable ring 903. It should be noted here that the movable component is designed to facilitate the pushing of the adjusting ring 403 according to the movement of the trencher 7.

[0027] Please see Figure 6 The control components shown in the figure include two control plates 1101 arranged symmetrically in the drive box 201, a control rod 1102 rotatably connected between the two control plates 1101, a transmission belt 302 slidably connected to the control rod 1102, and a pressing component for pressing the control rod 1102 in the drive box 201. It should be noted here that: by setting the control components, the elastic stretching action of the compression component on the control rod 1102 ensures that the transmission belt 302 maintains its tension, thereby ensuring the stability of the power transmission from the transmission belt 302 to the rotating rod 102.

[0028] Please see Figure 7 The extrusion assembly shown in the figure includes an extrusion box 1201 fixedly connected to the inner wall of the drive box 201. An extrusion plate 1202 is slidably connected to the side of the extrusion box 1201 near the control rod 1102. One end of the extrusion plate 1202 is connected to the control plate 1101. The other end of the extrusion plate 1202 away from the control plate 1101 is located inside the extrusion box 1201 and is fixedly connected to a sliding plate 1203. An extrusion rod 1204 is fixedly connected between two opposing inner walls of the extrusion box 1201. The sliding plate 1203 is slidably connected to the extrusion rod 1204. Extrusion springs 1205 are sleeved on the side walls of the two extrusion rods 1204. The two ends of the two extrusion springs 1205 are respectively connected to the inner wall of the extrusion box 1201 and the sliding plate 1203. It should be noted here that the compression assembly is used to provide elastic tensile force to the control lever 1102.

[0029] Working principle: When loosening the soil, the housing 101 is first connected to the tractor, and the drive plate 203 on one side of the drive box 201 is connected to the power components (including but not limited to motors, diesel engines, etc.) on the tractor. Then, the traction of the tractor can be used to drive the loosening teeth 103 on the housing 101 to move on the soil surface. As each set of loosening teeth 103 moves on the soil surface, the power component drives the drive plate 203 to rotate. Then, under the transmission action of the universal joint, the worm gear 303 on the side wall of the drive rod 202 rotates. Subsequently, under the meshing transmission action of the worm gear 303 and the worm wheel 304, the transmission disc rotates. Thus, under the transmission action of the transmission belt 302, the rotating rod 102 is rotated, which in turn drives each set of loosening teeth 103 to rotate. Thus, by utilizing the rotation of each set of loosening teeth 103, the soil is broken up, thereby achieving the purpose of loosening the soil. Furthermore, as the tractor moves the housing 101, it will simultaneously move the trencher 7 on one side of the drive box 201, thereby enabling trenching of the loosened soil layer and improving the diversity of soil loosening. Meanwhile, when the soil layer with loose soil has a high hardness, it will apply a large pushing force to the trencher 7. Under the pushing force and the guiding action of the four T-shaped rods 802, the trencher 7 moves closer to the drive box 201, which in turn pushes the moving plate 901 to move within the drive box 201. Then, under the pushing force, the rotating plate 902 rotates. During the rotation of the rotating plate 902, under the pushing force and the guiding action of the first guide component, the adjusting ring 403 on one side of the moving ring 903 moves against the side wall of the rotating rod 102, which in turn drives each push plate 10 to rotate. During the rotation of each push plate 10, each arc plate 401 will move away from each other. After the arc plates 401 move away from each other, the transmission ratio of the transmission belt 302 to the rotating rod 102 will increase, thereby reducing the rotation speed of the rotating rod 102. This reduces the rotation speed of each loosening tooth 103 when the soil hardness is high, thereby increasing the rotation torque of each loosening tooth 103 and increasing the breaking force on hard soil. This reduces the risk of damage to each loosening tooth 103 due to excessive rotation speed when loosening hard soil, while improving the sensitivity and convenience of power adjustment of each loosening tooth 103 during soil breaking. Meanwhile, when the transmission belt 302 is stretched, the elastic stretching action of the compression assembly on the control rod 1102 will maintain the tension of the transmission belt 302, thereby ensuring the stability of the power transmission from the transmission belt 302 to the rotating rod 102.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A power transmission device for a small soil tiller based on soil resistance feedback, comprising: The housing (101) and the rotating rod (102) rotatably connected between the two inner walls of the housing (101) are provided with multiple sets of soil loosening components on the side wall of the rotating rod (102), and each set of soil loosening components is composed of multiple soil loosening teeth (103) arranged in a ring array; Its characteristic is that it further includes: A drive mechanism installed in the housing (101) for driving each loosening tooth (103); The drive mechanism includes a drive box (201) fixedly connected to the housing (101). The drive box (201) is rotatably connected to a drive rod (202). The drive rod (202) is connected to a rotating rod (102) through a transmission assembly. One end of the drive rod (202) is connected to a drive plate (203) through a universal joint. The end of the drive plate (203) away from the drive rod (202) is connected to the power component of the tractor.

2. The power transmission device for a small soil loosening machine based on soil resistance feedback according to claim 1, characterized in that: The transmission assembly includes a transmission rod (301) rotatably connected between two opposing inner walls of the drive box (201). A transmission disc is fixedly connected to the side wall of the transmission rod (301), and a transmission belt (302) is sleeved on the transmission disc. The rotating rod (102) is connected to the transmission belt (302) through a power adjustment assembly. The drive box (201) is provided with a control assembly for controlling the tension of the transmission belt (302). A worm gear (303) is fixedly connected to the inner side wall of the drive rod (202), and a worm wheel (304) is fixedly connected to the side wall of the transmission rod (301). The worm wheel (304) and the worm gear (303) are meshed with each other.

3. The power transmission device for a small soil loosening machine based on soil resistance feedback according to claim 2, characterized in that: The power adjustment assembly includes a plurality of arc-shaped plates (401) arranged in a ring array on the periphery of the side wall of the rotating rod (102). An adjustment plate (402) is fixedly connected to the two opposite side walls of each arc-shaped plate (401). An adjustment ring (403) is connected to the side wall of the rotating rod (102) through a first guide assembly. The adjustment ring (403) is provided with a pushing assembly for pushing each arc-shaped plate (401). The drive box (201) is provided with a moving assembly for moving the adjustment ring (403). One of the two opposite adjustment plates (402) is connected to the inner wall of the drive box (201) through a second guide assembly.

4. The power transmission device for a small soil loosening machine based on soil resistance feedback according to claim 3, characterized in that: The first guide assembly includes a first guide groove (501) formed on the side wall of the rotating rod (102), and a first guide plate (502) is slidably connected to the first guide groove (501), and an arc plate (401) is connected to one end of the first guide plate (502).

5. The power transmission device for a small soil loosening machine based on soil resistance feedback according to claim 4, characterized in that: The second guide assembly includes a second guide groove (601) opened on the side of the adjustment plate (402) away from the arc plate (401), the second guide groove (601) is slidably connected to a second guide plate (602), and one end of the second guide plate (602) is connected to the inner wall of the drive box (201).

6. The power transmission device for a small soil loosening machine based on soil resistance feedback according to claim 5, characterized in that: The pushing assembly includes two mutually symmetrically arranged pushing plates (10) that are rotatably connected between the adjusting ring (403) and the arc plate (401). The two ends of the two pushing plates (10) are respectively hinged to the adjusting ring (403) and the arc plate (401).

7. The power transmission device for a small soil loosening machine based on soil resistance feedback according to claim 6, characterized in that: The drive box (201) is provided with a trencher (7) on the side near the drive square plate (203), and the trencher (7) is connected to the drive box (201) through a connecting assembly; The connecting assembly includes a connecting plate (801) slidably connected to the drive box (201) on the side near the trencher (7). The connecting plate (801) is slidably connected to four T-shaped rods (802) arranged symmetrically in pairs. One end of each of the four T-shaped rods (802) is connected to the drive box (201). The side walls of the four T-shaped rods (802) are fitted with connecting springs (803). The two ends of each of the four connecting springs (803) are respectively connected to the connecting plate (801) and the drive box (201).

8. The power transmission device for a small soil loosening machine based on soil resistance feedback according to claim 7, characterized in that: The moving component includes a moving plate (901) slidably connected to the drive box (201) on the side near the trencher (7). One end of the moving plate (901) is connected to the connecting plate (801), and the other end of the moving plate (901) is located inside the drive box (201) and is hinged to a rotating plate (902). The adjusting ring (403) is rotatably connected to the moving ring (903) on the side near the rotating plate (902). The end of the rotating plate (902) away from the moving plate (901) is hinged to the moving ring (903).

9. A small soil loosening machine power transmission device based on soil resistance feedback according to claim 8, characterized in that: The control assembly includes two control plates (1101) arranged symmetrically in the drive box (201), a control rod (1102) is rotatably connected between the two control plates (1101), the transmission belt (302) is slidably connected to the control rod (1102), and the drive box (201) is provided with a pressing assembly for pressing the control rod (1102).

10. A small soil loosening machine power transmission device based on soil resistance feedback according to claim 9, characterized in that: The extrusion assembly includes an extrusion box (1201) fixedly connected to the inner wall of the drive box (201). An extrusion plate (1202) is slidably connected to the side of the extrusion box (1201) near the control rod (1102). One end of the extrusion plate (1202) is connected to the control plate (1101). The end of the extrusion plate (1202) away from the control plate (1101) is located inside the extrusion box (1201) and is fixedly connected to a sliding plate (1203). An extrusion rod (1204) is fixedly connected between two opposing inner walls of the extrusion box (1201). The sliding plate (1203) is slidably connected to the extrusion rod (1204). Extrusion springs (1205) are sleeved on the side walls of the two extrusion rods (1204). The two ends of the two extrusion springs (1205) are respectively connected to the inner wall of the extrusion box (1201) and the sliding plate (1203).

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