A light and simple rotary membrane breaking device with counting function

Abstract

The application discloses a light and simple rotary membrane breaking device with a counting function, which comprises a rack, a rotary driving mechanism arranged at the lower end of the rack, and a membrane breaking assembly connected with the rotary driving mechanism; and further comprises a counting mechanism, wherein the counting mechanism comprises a counter and a triggering device connected with the counter; the counter is fixedly arranged on the upper portion of the rack; the triggering device is arranged between the rotary driving mechanism and the membrane breaking assembly; the triggering device generates a triggering signal when the membrane breaking assembly completes a complete membrane breaking action; and the counter accumulatively counts after receiving the triggering signal. The application has the advantages of simple and compact structure, low manufacturing cost, light weight, small size, flexible and convenient operation, no need of manually tearing the membrane, labor saving, counting function, and convenient post management.

Description

Technical Field

[0001] This invention relates to a lightweight, simple rotary film-breaking device with counting function, belonging to the technical field of agricultural film-breaking equipment, and is suitable for film-breaking operations in the planting process of film-covered crops such as tobacco, vegetables, and cotton. Background Technology

[0002] Mulching technology is a core measure in modern agriculture for conserving moisture, increasing temperature, suppressing weeds, and improving quality and yield. This planting technique has become a widely adopted yield-increasing technology in dryland and facility agriculture, and is widely used in the cultivation of cash crops, grains, and vegetables. However, mulching technology still has several shortcomings in practical operation: the soil covering the roots of seedlings is too thin after transplanting, making it difficult for the inside of the film to effectively exchange with the outside atmosphere. This makes it easy for weeds to grow around the film holes, thus competing with crops for water and fertilizer, ultimately adversely affecting the yield and quality of crops such as tobacco and peppers. Therefore, breaking the film is an indispensable step before sowing, transplanting, and seedling introduction. Appropriately sized openings should be made at the transplanting points on the ridge according to the designed plant spacing, and a suitable amount of soil should be pressed over the openings. This practice can significantly reduce weed damage and improve gas and water exchange between the inside and outside of the film, thereby ensuring both stable water supply and continuous weed control during the seedling stage.

[0003] However, traditional manual film-breaking operations are inefficient, labor-intensive, and produce irregular hole shapes and large hole spacing deviations, making it difficult to meet the needs of standardized planting. Large machinery, on the other hand, is poorly adapted to hilly terrain and small plots. Therefore, lightweight and efficient film-breaking and hole-drilling machines have become a necessity. The current shift in agricultural production towards simplification and mechanization, coupled with labor shortages and rising costs, is further driving the research and development and implementation of simplified operation equipment.

[0004] Existing handheld film-breaking devices are mainly divided into sawtooth film-breaking, cone film-breaking, and roller film-breaking. Their working principle is to align the film-breaking head with the desired location and use pressure to complete the film-breaking operation. These handheld film-breaking devices mainly have the following problems: (1) The rupture head of the sawtooth film rupture machine has multiple blades, which can form multiple ruptures on the film. However, after rupture, the film needs to be manually rotated and torn, making it difficult to guarantee the rupture quality. (2) The cone-shaped film breaker forms regular holes with relatively uniform size during the film breaking process. However, the cone head will penetrate into the soil during operation, resulting in greater resistance during the film breaking process. In Guizhou, a region with heavy clay soil, the soil tends to stick to the film breaking head during the film breaking process, requiring regular cleaning. (3) The roller film breaking machine can complete the film breaking operation at equal distances and equal sizes, and the film breaking quality is good. However, this film breaking method has a smaller film breaking size and is not suitable for some seedling transplanting (such as tobacco seedling well cellar transplanting).

[0005] In summary, existing handheld film-breaking devices suffer from problems such as inconsistent soil penetration depth, easy tearing of mulch film, and incomplete film breaking. Considering the fragmented nature of plots and diverse mulched crops in the hilly and mountainous areas of Guizhou, there is an urgent need to optimize the punching mechanism, power source, and human-machine operation performance to improve the adaptability, operational accuracy, portability, and durability of film-breaking equipment. Research on a lightweight, simplified rotary film-breaking machine can solve the challenges of film-breaking operations in small-area, highly flexible scenarios. Summary of the Invention

[0006] In view of this, the present invention provides a lightweight and simple rotary film breaking device with counting function, which overcomes the defects of existing handheld film breaking devices such as the need for manual rotation to tear the film, large resistance to soil entry, incomplete film opening, and lack of counting function.

[0007] The objective of this invention is achieved through the following technical solution: A lightweight, simplified rotary film-breaking device with counting function includes a frame, a rotary drive mechanism and a film-breaking assembly connected to the rotary drive mechanism at the lower end of the frame; it also includes a counting mechanism, which includes a counter and a triggering device connected to it. The counter is fixedly installed on the upper part of the frame, and the triggering device is located between the rotary drive mechanism and the film-breaking assembly. The triggering device generates a trigger signal when the film-breaking assembly completes a complete film-breaking action, and the counter accumulates the count after receiving the trigger signal.

[0008] Furthermore, the frame includes an operating lever and a connecting rod detachably connected to the lower end of the operating lever. The connecting rod is a hollow tube. A handle is fixedly provided at the upper end of the operating lever, and the handle has a T-shaped or U-shaped structure.

[0009] Furthermore, the rotary drive mechanism includes a limiting sleeve with a connecting plate on its outer circumference, so that the limiting sleeve is fixedly connected to the lower end of the connecting rod through the connecting plate. The upper section of the limiting sleeve is provided with a spiral limiting groove, and an adjusting rod is fitted inside the limiting sleeve. The upper end of the adjusting rod is fixedly connected with a limiting pin, and the limiting pin is located in the spiral limiting groove. A spring is provided in the middle of the adjusting rod, and a connecting flange is provided at the lower end. The membrane breaking assembly is connected to the adjusting rod through the connecting flange.

[0010] Furthermore, a plurality of adjusting holes are provided at intervals along the axis of the adjusting rod, and adjusting pins are provided in the adjusting holes. The spring is fitted on the adjusting rod and is located between the limiting sleeve and the adjusting pin.

[0011] Furthermore, the membrane breaking assembly includes a rotating cylinder, and a serrated membrane breaking head is provided at the bottom end of the rotating cylinder. The serrated membrane breaking head includes a plurality of serrations evenly distributed circumferentially along the lower end face of the rotating cylinder.

[0012] Furthermore, a guide rod is provided at the center of the rotating cylinder, with the lower end of the guide rod extending relative to the lower end of the rotating cylinder and located below the serrations of the rotating cylinder.

[0013] Furthermore, the bottom end of the guide rod has a tapered structure, and the tapered structure is also provided with a barb structure to facilitate the collection of residual film.

[0014] Furthermore, the counter is an electronic counter fixedly mounted on the handle. The upper end of the connecting rod is provided with a mounting hole opposite to the highest point of the spiral limiting groove. The triggering device is set in the mounting hole. When the limiting pin moves along the spiral limiting groove to the highest point of the spiral limiting groove, it approaches the triggering device. The triggering device sends an electrical signal to the counter. After receiving the signal, the counter accumulates the count and displays it.

[0015] Furthermore, the triggering device includes, but is not limited to, an infrared detector, a proximity switch, and a Hall switch.

[0016] Furthermore, a mounting bracket is provided in the middle of the handle, and a fixing part is provided in the middle of the mounting bracket. The fixing part is provided with a mounting groove adapted to the counter. The counter is fixedly connected in the mounting groove. Fixing clamps are symmetrically provided on both sides of the fixing part. The fixing clamps are snapped onto the handle and fixedly connected to it by U-bolts.

[0017] Compared with the prior art, the beneficial effects of the present invention are: (1) The structure is simple and compact, and the manufacturing cost is low. The present invention adopts a handheld design, which is lightweight, small in size, flexible and convenient to operate, and is not limited by terrain. It is suitable for breaking the film of various mulched crops such as tobacco, vegetables, and cotton.

[0018] (2) No manual film tearing required, saving labor. This invention uses a spiral limiting groove structure to mechanically drive the rotating cylinder and the sawtooth film-breaking head to rotate. The rotating sawtooth cuts and breaks the film. The operator only needs to press down and lift the operating rod to complete the film-breaking operation. Compared with the traditional manual rotating film tearing method, there is no need for the operator to manually apply force to rotate the film-breaking cylinder, which greatly reduces labor intensity and improves work efficiency.

[0019] (3) The film opening is complete and regular. The present invention uses a rotary cutting method to break the mulch film. The serrated teeth rotate and cut the mulch film neatly, forming a complete circle with a uniform opening size and smooth and neat edges. Compared with the irregular tearing film opening caused by manual tearing, the film opening broken by the present invention is more conducive to the subsequent transplanting operation and can also better maintain the heat preservation and moisture retention effect of the mulch film.

[0020] (4) It has a counting function. The present invention automatically accumulates the count each time the film breaking action is completed through the cooperation of a trigger device and a counter. The operator can keep track of the number of films broken in real time without having to perform additional manual counting, which effectively solves the problems of low efficiency and poor accuracy of manual counting. The counting function is particularly suitable for large-scale planting scenarios, which facilitates later management.

[0021] (5) Low resistance during rotational cutting. This invention features a guide rod at the center of the rotating cylinder. During operation, the operator manually presses down the guide rod and the serrated edge at the bottom of the rotating cylinder to pierce the mulch film. The operator then continues to press down, guiding the rotating cylinder to cut the mulch film through a spiral limiting groove structure. This effectively reduces soil resistance during the cutting process. Simultaneously, the guide rod also has a residual film collection function, effectively saving subsequent residual film collection steps and time.

[0022] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will now be described in further detail with reference to the accompanying drawings, wherein: Figure 1 A front view of a simplified rotary membrane breaking device with counting function provided in an embodiment of the present invention; Figure 2 A side cross-sectional view of a lightweight, simplified rotary membrane breaking device with counting function provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the frame structure; Figure 4 This is a schematic diagram of the rotary drive mechanism; Figure 5 This is a structural diagram of the mounting bracket; Figure 6 This is a schematic diagram of the membrane breaking assembly provided in Embodiment 2 of the present invention.

[0024] In the diagram: 1. Operating lever; 2. Connecting rod; 3. Handle; 4. Limiting sleeve; 401. Connecting plate; 402. Spiral limiting groove; 5. Adjusting rod; 501. Connecting flange; 502. Adjusting hole; 6. Limiting pin; 7. Spring; 8. Adjusting pin; 9. Rotating cylinder; 901. Serrated film breaking head; 10. Guide rod; 11. Counter; 12. Triggering device; 13. Mounting bracket; 1301. Fixing part; 1302. Fixing clamp; 14. Barbed structure. Detailed Implementation

[0025] 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. Example 1

[0026] like Figures 1-5 As shown, the first embodiment of the present invention provides a lightweight and simplified rotary film breaking device with counting function, including a frame, a rotary drive mechanism, a film breaking component and a counting mechanism.

[0027] The frame is preferably made of stainless steel to ensure sufficient structural strength and corrosion resistance. The frame includes an operating lever 1 and a connecting rod 2 detachably connected to the lower end of the operating lever 1. The connecting rod 2 is a hollow tube. A handle 3 is fixedly installed at the upper end of the operating lever 1. The handle 3 has a T-shaped or U-shaped structure for easy two-handed operation. The surface of the handle 3 can be provided with anti-slip texture to increase grip friction. The lower end of the operating lever 1 is threaded to the upper end of the connecting rod 2. The lower end of the connecting rod 2 is connected to the rotary drive mechanism.

[0028] The rotary drive mechanism includes a limiting sleeve 4, with a connecting plate 401 on its outer circumference. The limiting sleeve 4 is fixedly connected to the lower end of the connecting rod 2 via the connecting plate 401. The upper section of the limiting sleeve 4 is located within the hollow structure of the connecting rod 2. A spiral limiting groove 402 is provided in the upper section of the limiting sleeve 4. An adjusting rod 5 is fitted inside the limiting sleeve 4. A limiting pin 6 is fixedly connected to the upper end of the adjusting rod 5, and the limiting pin 6 is located within the spiral limiting groove 402. A spring 7 is provided in the middle of the adjusting rod 5, and a connecting flange 501 is provided at the lower end. The membrane breaking assembly is connected to the adjusting rod via the connecting flange 501. The length of the spiral limiting groove 402 should ensure that the membrane breaking assembly can rotate at least a certain angle to achieve membrane breaking after the limiting pin 6 moves along the spiral limiting groove 402 to the highest point of the spiral limiting groove 402. Specifically, in this embodiment, the spiral limiting groove 402 extends spirally along the circumferential direction of the limiting sleeve 4, and its spiral angle is 60° to 90°, preferably 70°, so that the adjusting rod 5 can slide up and down along the axial direction of the limiting sleeve 4 and can rotate around the axis to achieve membrane breaking.

[0029] Furthermore, multiple adjusting holes 502 are spaced apart along the axis of the adjusting rod 5, and adjusting pins 8 are provided in the adjusting holes 502. The spring 7 is fitted onto the adjusting rod 5 and located between the limiting sleeve 4 and the adjusting pins 8. By installing the adjusting pins 8 in different adjusting holes, the restoring force of the spring 7 can be adjusted. During the film breaking process, after the film breaking device is lifted, the film breaking assembly returns to its original state, waiting for the next film breaking. Specifically, the stiffness of the spring 7 is determined according to the weight of the film breaking assembly. Its selection principle is as follows: when the film breaking assembly is in a natural suspension state, the spring 7 should be in its natural length or slightly compressed state; when the film breaking assembly is pressed upward, the spring 7 is compressed and stores elastic potential energy; when the external force is removed, the spring 7 releases elastic potential energy and drives the adjusting rod 5 and the film breaking assembly to reset. For example, the spring 7 is a cylindrical helical compression spring, made of 65Mn spring steel, with a wire diameter of 1.5 to 3.0 mm and a spring stiffness of 5 to 20 N / mm. The specific value is adapted according to the actual weight of the film breaking assembly.

[0030] The membrane breaking assembly includes a rotating cylinder 9, with a serrated membrane breaking head 901 at the bottom end of the rotating cylinder 9. The rotating cylinder 9 is a cylindrical structure made of stainless steel.

[0031] A serrated film-breaking head 901 is fixedly disposed on the lower end face of the rotating cylinder 9. The serrated film-breaking head 901 includes 8 to 16 serrations evenly distributed circumferentially along the lower end face of the rotating cylinder 9. The cutting edge of each serration faces downward, and the serrations gradually narrow from the root to the tip, forming a V-shaped cutting gap between adjacent serrations.

[0032] A guide rod 10 is also provided at the center of the rotating cylinder 9. The lower end of the guide rod 10 extends relative to the lower end of the rotating cylinder 9, and when in the extended state, the lower end of the guide rod 10 is located below the serrations of the rotating cylinder 9. Specifically, the distance between the lower end of the guide rod 10 and the tip of the serrations of the rotating cylinder 9 is not less than 5 mm. During the rupture of the film, the bottom end of the guide rod 10 first contacts the film and plays a positioning and guiding role.

[0033] The counting mechanism includes a counter 11 and a triggering device 12 connected to it. The counter 11 is an electronic counter, fixedly mounted on the handle 3, and has a counting display window and a reset button. In this embodiment, the counter 11 can be a commercially available JK76 electronic counter, with an operating voltage of DC 3-12V, powered by a button battery or dry cell battery, and a signal input interface using level triggering or pulse triggering. The counter 11 has a counting range of 0-9999 and a power-off memory function. The triggering device 12 includes, but is not limited to, an infrared probe, a proximity switch, and a Hall effect switch. A mounting hole is provided at the upper end of the connecting rod 2, opposite to the highest point of the spiral limiting groove 402. The triggering device 12 is installed in the mounting hole. When the limiting pin 6 moves along the spiral limiting groove 402 to the highest point of the spiral limiting groove 402, it approaches the triggering device 12. The triggering device 12 sends an electrical signal to the counter 11, which receives the signal, accumulates the count, and displays the result. In this embodiment, the triggering device 12 is a Hall switch, with a corresponding magnet on the limiting pin 6. The sensing distance between the magnet and the Hall switch is 2-10 mm. The Hall switch is fixedly installed in the mounting hole at the upper end of the connecting rod 2, with its sensing surface facing the magnet on the limiting pin 6. When the limiting pin 6 moves along the spiral limiting groove 402 to the highest point of the spiral limiting groove 402, the magnet approaches the Hall switch, triggering the Hall switch to operate. The Hall switch sends an electrical pulse signal to the counter 11, which receives the signal, accumulates the count, and displays the result. The Hall switch and the counter 11 are electrically connected by a wire, which runs along the inside or outside of the operating rod 1 and the connecting rod 2. The power supply battery for the counter 11 is located inside the handle 3 or inside the housing of the counter 11.

[0034] A mounting bracket 13 is provided in the middle of the handle 3, and a fixing part 1301 is provided in the middle of the mounting bracket. The fixing part 1301 has a mounting groove adapted to the counter 11, and the counter 11 is fixedly connected in the mounting groove. Fixing clamps 1302 are symmetrically provided on both sides of the fixing part 1301. The fixing clamps 1302 are snapped onto the handle 3 and fixed to it by U-bolts. The mounting bracket 13 is made of stainless steel or engineering plastic to ensure that the counter 11 is installed firmly. Example 2

[0035] like Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that the bottom end of the guide rod 10 is a conical structure, and the conical structure at the bottom end of the guide rod 10 is also provided with a barbed structure 14 to facilitate the collection of residual film. When the film is broken, the guide rod 10 first punctures the film and plays a positioning and guiding role. At the same time, when the residual film is cut off by the saw teeth, it is inserted into the guide rod 10 under the action of the barbed structure 14 to achieve the collection of residual film.

[0036] The barbed structure 14 is an elastic sheet or an elastic rod. At least one elastic sheet or rod is provided and extends downwards at an angle along the tip of the conical structure. When the conical structure is pulled upwards, the barbed structure 14 helps the residual film to adhere to the guide and prevent it from falling off. The V-shape formed between the conical structure and the downwardly angled elastic sheet or rod further prevents the residual film from falling off and reduces resistance to soil penetration, making the operation more time-saving and efficient.

[0037] Working principle and process of the device: (1) Hold the handle 3 and control the operating lever 1 to make the rotating cylinder 9 press down on the film. Press down, and the serrations at the lower end of the rotating cylinder 9 and the conical structure at the lower end of the guide rod 10 located at the center of the rotating cylinder 9 will move downward. This can puncture the film first. Then, the operating lever 1 will continue to press down. The rotating cylinder 9 will be resisted by the soil of the ridge, causing the adjusting rod 5 to move vertically upward along the shaft hole of the connecting rod 2. This will cause the limiting pin 6 to move along the spiral limiting groove, driving the rotating cylinder 9 to rotate at a certain angle while moving upward. This can puncture the film and rotate to remove the part of the film that is still attached, thus completing the film breaking operation and removing the film. The barbed structure 14 at the lower end of the guide rod 10 can fix the cut residual film on the guide rod 10, and simultaneously collect the residual film. After the film breaking operation, the spring 7 releases the pressure, and the rotating cylinder 9 moves down to reset. Repeat the above steps to remove the film again. (2) During the membrane breaking process, when the limiting pin 6 moves along the spiral limiting groove to the highest point of the spiral limiting groove, it will approach the triggering device 12, thereby causing the triggering device 12 to send an electrical signal to the counter 11. After receiving the signal, the counter 11 will accumulate and display the signal.

[0038] The working principle of the Hall switch-based counting device for real-time detection of film breakage is as follows: A magnet is fixed to one end of a limit pin 6. During the film breakage process, the limit pin 6 moves along the spiral limit groove to its highest point. The magnet on the limit pin 6 periodically moves closer to or further away from the fixed Hall switch, sensing changes in the surrounding magnetic field based on the Hall effect and generating an electrical signal. The electrical signal generated by the Hall switch is sent to a counter chip for processing. The counter chip records the signal sensed by the Hall switch each time and converts it into a count value, thus realizing the counting function. Finally, the counter's display screen shows the number of film breaks. Therefore, each voltage pulse generated during the film breakage process counts once, thus achieving accurate counting.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments without departing from the technical solution of the present invention and based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A lightweight, simplified rotary membrane breaking device with counting function, characterized in that, The device includes a frame, with a rotary drive mechanism and a film-breaking assembly connected to the rotary drive mechanism at the lower end; it also includes a counting mechanism, which includes a counter (11) and a trigger device (12) connected thereto. The counter (11) is fixedly installed on the upper part of the frame, and the trigger device (12) is installed between the rotary drive mechanism and the film-breaking assembly. The trigger device (12) generates a trigger signal when the film-breaking assembly completes a complete film-breaking action, and the counter (11) accumulates the count after receiving the trigger signal.

2. The lightweight, simplified rotary membrane breaking device with counting function according to claim 1, characterized in that, The frame includes an operating lever (1) and a connecting rod (2) detachably connected to the lower end of the operating lever (1). The connecting rod (2) is a hollow tube. A handle (3) is fixedly installed at the upper end of the operating lever (1), and the handle (3) has a T-shaped or U-shaped structure.

3. The lightweight, simplified rotary membrane breaking device with counting function according to claim 2, characterized in that, The rotary drive mechanism includes a limiting sleeve (4), and a connecting plate (401) is provided on the outer circumference of the limiting sleeve (4), so that the limiting sleeve (4) is fixedly connected to the lower end of the connecting rod (2) through the connecting plate (401). The upper section of the limiting sleeve (4) is provided with a spiral limiting groove (402). An adjusting rod (5) is fitted inside the limiting sleeve (4). The upper end of the adjusting rod (5) is fixedly connected with a limiting pin (6), and the limiting pin (6) is located in the spiral limiting groove (402). A spring (7) is provided in the middle of the adjusting rod (5), and a connecting flange (501) is provided at the lower end. The membrane breaking assembly is connected to the adjusting rod (5) through the connecting flange (501).

4. The lightweight, simplified rotary membrane breaking device with counting function according to claim 3, characterized in that, Multiple adjustment holes (502) are provided at intervals along the axis of the adjustment rod (5), and adjustment pins (8) are provided in the adjustment holes (502). The spring (7) is fitted on the adjustment rod (5) and located between the limiting sleeve (4) and the adjustment pin (8).

5. The lightweight, simplified rotary membrane breaking device with counting function according to claim 3, characterized in that, The membrane breaking assembly includes a rotating cylinder (9), and a serrated membrane breaking head (901) is provided at the bottom end of the rotating cylinder (9). The serrated membrane breaking head (901) includes a plurality of serrations evenly distributed along the lower end face of the rotating cylinder (9).

6. The lightweight, simplified rotary membrane breaking device with counting function according to claim 5, characterized in that, A guide rod (10) is also provided at the center of the rotating cylinder (9). The lower end of the guide rod (10) extends relative to the lower end of the rotating cylinder (9) and is located below the serrations of the rotating cylinder (9).

7. The lightweight, simplified rotary membrane breaking device with counting function according to claim 6, characterized in that, The bottom end of the guide rod (10) is a conical structure, and the conical structure is also provided with a barbed structure (14) to facilitate the collection of residual film.

8. The lightweight, simplified rotary membrane breaking device with counting function according to claim 3, characterized in that, The counter (11) is an electronic counter fixedly mounted on the handle (3). The upper end of the connecting rod (2) is provided with a mounting hole opposite to the highest point of the spiral limiting groove (402). The trigger device (12) is installed in the mounting hole. When the limiting pin (6) moves along the spiral limiting groove (402) to the highest point of the spiral limiting groove (402), it approaches the trigger device (12). The trigger device (12) sends an electrical signal to the counter (11). After receiving the signal, the counter (11) accumulates the count and displays it.

9. The lightweight, simplified rotary membrane breaking device with counting function according to claim 8, characterized in that, The triggering device (12) includes, but is not limited to, an infrared probe, a proximity switch, and a Hall switch.

10. The lightweight, simplified rotary membrane breaking device with counting function according to claim 8, characterized in that, A mounting bracket (13) is provided in the middle of the handle (3), and a fixing part (1301) is provided in the middle of the mounting bracket. The fixing part (1301) is provided with a mounting groove adapted to the counter (11). The counter (11) is fixed in the mounting groove. Fixing plates (1302) are symmetrically provided on both sides of the fixing part (1301). The fixing plates (1302) are snapped onto the handle (3) and fixed to it by U-bolts.

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