A fire-retardant conveyor belt processing paste scraping device

Abstract

The present application relates to the technical field of paste scraping device, and discloses a kind of paste scraping device for processing flame-retardant conveyor belt.The device includes a rack, and further includes: a conveying mechanism for continuously conveying the flame-retardant conveyor belt, two symmetrically arranged paste scraping mechanisms, the spacing of the two paste scraping mechanisms is adjustable, a guide shaft, which is rotatably connected to the rack and driven by a first motor, a negative pressure paste suction assembly, which uses negative pressure to achieve negative pressure suction of the paste, and a paste scraping mechanism including a scraping frame, the scraping frame is fixedly installed with an inner cylinder and a linkage module linked with the guide shaft, and the top of the inner cylinder is provided with an inlet.The flame-retardant conveyor belt is conveyed in the present application, the guide shaft outputs the set speed in the state, the multiple scraping modules on the indexing cylinder can perform revolution after the guide shaft outputs the speed, the revolution of the scraping modules occurs, so that the multiple scraping modules can cyclically scrape the paste on the outer edge and the front and back surfaces of the flame-retardant conveyor belt.

Description

Technical Field

[0001] This invention relates to the technical field of flame-retardant conveyor belt processing scraping device, specifically a flame-retardant conveyor belt processing scraping device. Background Technology

[0002] Flame-retardant conveyor belts, also known as solid woven flame-retardant conveyor belts, are made by impregnating and plasticizing a solid core with polyvinyl chloride (PVC) paste and then extruding it. During the impregnation, plasticizing, and extrusion process of the solid core, the edges of the flame-retardant conveyor belt obtained immediately after impregnation and plasticizing with PVC paste are uneven, with clumps of PVC paste hanging on it. After these PVC paste clumps dry, they are difficult and troublesome to clean because the flame-retardant conveyor belt is very long. Moreover, after cleaning, the edges of the flame-retardant conveyor belt appear uneven, affecting its appearance and performance.

[0003] In the prior art, patent document with publication number CN215046006U discloses a scraping device for processing flame-retardant conveyor belts, including a mounting base, support legs, a front scraping assembly, a side scraping mechanism, a reversing wheel mechanism, and a drive assembly. The support legs are fixed to the bottom of the mounting base, and the front scraping assembly is fixed to the side of the mounting base away from the support legs. The front scraping assembly includes a pressing mechanism and a scraping plate mechanism, with the scraping plate mechanism fixed to the pressing mechanism. By setting the front scraping assembly, the glue balls on both sides of conveyor belts of different thicknesses can be scraped off at one time. By setting the side scraping mechanism, the glue balls on the sides of conveyor belts of different widths can be scraped off quickly.

[0004] However, the above-mentioned paste scraping device has the following technical problems in use:

[0005] 1. Most existing paste scraping devices are single-plate scraping structures. Due to the limitations of the above structure, the scraping efficiency of the paste is relatively limited. Moreover, existing paste scraping devices cannot achieve sequential rotational scraping of the paste, online rapid centralized discharge of scraped paste, and negative pressure collection.

[0006] 2. Existing paste scraping devices cannot effectively prevent the scraped paste from overflowing from the scraping structure;

[0007] Based on this, the present invention provides a flame-retardant conveyor belt processing scraping device to solve the technical problems mentioned in the background art. Summary of the Invention

[0008] The purpose of this invention is to provide a paste scraping device for processing flame-retardant conveyor belts. In this invention, when the flame-retardant conveyor belt is conveyed, the guide shaft outputs a rotational speed in a set state. After the guide shaft outputs the rotational speed, on the one hand, multiple scraping modules on the indexing cylinder can revolve. Through the revolve motion of the scraping modules, the multiple scraping modules can cyclically scrape the paste on the outer edge and front and back surfaces of the flame-retardant conveyor belt. On the other hand, when the multiple scraping modules revolve, the reciprocating screw reciprocates in both forward and reverse directions within a set cycle. After the reciprocating screw reciprocates in both forward and reverse directions within the set cycle, the distance between the two scraper blades can be changed back and forth. Through the reciprocating change of the distance between the two scraper blades, the paste scraped from the scraper frame can be quickly collected and quickly discharged.

[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0010] A flame-retardant conveyor belt processing scraping device includes a frame and further includes:

[0011] Conveying mechanism for continuous conveying of flame-retardant conveyor belts;

[0012] Two symmetrically arranged paste-scraping mechanisms, the distance between the two paste-scraping mechanisms is adjustable;

[0013] The guide shaft is rotatably connected to the frame and driven by the first motor;

[0014] The negative pressure suction assembly uses negative pressure to remove paste.

[0015] The scraping mechanism includes a scraper frame, on which an inner cylinder and a linkage module linked to a guide shaft are fixedly mounted. A feed port is opened at the top of the inner cylinder. A rotating cylinder is rotatably sleeved on the inner cylinder. Both the inner cylinder and the rotating cylinder are driven by the linkage module. A negative pressure shaft cylinder, which is connected to the negative pressure suction assembly, is rotatably connected to the axial position of the inner cylinder. An internal gear ring is fixedly mounted on the negative pressure shaft cylinder. A set of scraping modules arranged in a circumferential array and drivenly connected to the internal gear ring are mounted on the rotating cylinder.

[0016] Preferably, the conveying mechanism includes two guide rollers symmetrically rotatably connected between the inner surfaces of the frame. The frame conveys a flame-retardant conveyor belt through the guide rollers. A vertical processing section is fixedly provided on the flame-retardant conveyor belt at a position corresponding to the two guide rollers. A conveying motor is fixedly installed on the side of the frame, and the output shaft end of the conveying motor is fixedly connected to one of the guide rollers.

[0017] Preferably, an adjustable lead screw driven by a second motor is rotatably connected to the frame. The adjustable lead screw is symmetrically provided with a positive thread area a and a negative thread area a, which are respectively connected to the scraper frame in the two scraping mechanisms.

[0018] Preferably, the linkage module includes a transmission sleeve and a coupling rotatably connected to the scraper. The transmission sleeve is driven by a guide shaft. Both the coupling and the transmission sleeve are fixedly installed with linkage bevel teeth, which mesh with each other. A first chain and a second chain are respectively driven connected to the coupling. The first chain is driven to the indexing cylinder, and the second chain is driven to the negative pressure cylinder.

[0019] Preferably, the transmission sleeve has a fixed shaft groove with openings at both ends and slidably connected to the guide shaft. The cross-sections of the shaft groove and the guide shaft are both regular polygons, and the rotation speed of the negative pressure shaft cylinder is 5 times that of the rotation speed of the indexing cylinder.

[0020] Preferably, the negative pressure suction assembly includes a storage box connected to the frame, a suction pump fixedly connected to the storage box, a three-way flexible hose fixedly connected to the negative pressure port of the suction pump, a negative pressure suction channel connected to the three-way flexible hose inside the negative pressure cylinder, and a set of negative pressure suction holes arranged in a circumferential array and connected to the negative pressure suction channel on the negative pressure cylinder.

[0021] Preferably, the scraping module includes a scraping frame fixedly connected to the indexing cylinder, a material discharge port is provided on the indexing cylinder and at a position adjacent to the scraping frame, a scraping notch adapted to the width of the flame-retardant conveyor belt is fixedly provided in the middle of the scraping frame, a reciprocating drive component connected to the internal gear ring is rotatably connected to the inner wall of the indexing cylinder, and two symmetrically arranged material removal shovels are slidably connected to the inner wall of the scraping frame, the distance between the two material removal shovels is changed reciprocally by the reciprocating drive component.

[0022] Preferably, the reciprocating drive component includes a reciprocating lead screw rotatably connected between the inner surface of the indexing cylinder, a torsion spring fixedly provided at the rotatable connection between the reciprocating lead screw and the indexing cylinder, a positive thread area b and a negative thread area b symmetrically provided on the reciprocating lead screw, the positive thread area b and the negative thread area b being respectively drivenly connected to two material removal shovels on the scraping module, a first gear fixedly installed on the reciprocating lead screw, a gear shaft rotatably connected to the side of the indexing cylinder, a half-transmission gear and a second gear fixedly installed on the gear shaft, the half-transmission gear being drivenly connected to the first gear, and the second gear being drivenly connected to the internal gear ring.

[0023] Preferably, the radius of the half gear is 8 to 10 times the radius of the first gear.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0025] In this invention, when the flame-retardant conveyor belt is conveying, the guide shaft outputs a rotational speed in a set state. After the guide shaft outputs the rotational speed, on the one hand, multiple scraping modules on the indexing cylinder can revolve. Through the revolve motion of the scraping modules, the multiple scraping modules can cyclically scrape off the paste on the outer edge and front and back surfaces of the flame-retardant conveyor belt. On the other hand, when the multiple scraping modules revolve, the reciprocating screw reciprocates in both directions within a set cycle. After the reciprocating screw reciprocates in both directions within the set cycle, the distance between the two scraper blades can be changed back and forth. Through the reciprocating change of the distance between the two scraper blades, the paste scraped off the scraper frame can be quickly collected and discharged. Through the realization of the above-mentioned rapid collection and discharge effect, on the one hand, the adhesion rate of the paste on the inner wall of the scraper frame can be effectively reduced, thereby avoiding the paste overflowing from the scraper frame during continuous scraping, and on the other hand, the scraping effect of the paste can be effectively improved. Attached Figure Description

[0026] Figure 1 A schematic diagram of a flame-retardant conveyor belt scraping device;

[0027] Figure 2 A schematic diagram of the storage tank and suction pump;

[0028] Figure 3 for Figure 2 A magnified schematic diagram of the local structure at point A;

[0029] Figure 4 This is a schematic diagram of the scraper frame and scraper structure;

[0030] Figure 5 for Figure 4 A magnified schematic diagram of the local structure at point B;

[0031] Figure 6 for Figure 4 A magnified schematic diagram of the structure at point C in the middle;

[0032] Figure 7 A schematic diagram of the scraper frame and reciprocating lead screw;

[0033] Figure 8 for Figure 7 A magnified schematic diagram of the local structure at point D;

[0034] Figure 9 A schematic diagram of the inner cylinder and the negative pressure shaft cylinder;

[0035] Figure 10 This is a schematic diagram of the negative pressure shaft cylinder and the negative pressure suction hole.

[0036] The components are as follows: 1. Frame; 2. Flame-retardant conveyor belt; 3. Guide shaft; 4. Scraper frame; 5. Inner cylinder; 6. Feed inlet; 7. Indexing cylinder; 8. Negative pressure shaft cylinder; 9. Internal gear ring; 10. Guide roller; 11. Conveyor motor; 12. Adjustable screw; 13. Transmission sleeve; 14. Coupling; 15. Storage box; 16. Suction pump; 17. T-shaped hose; 18. Negative pressure suction hole; 19. Scraper frame; 20. Discharge port; 21. Scraping notch; 22. Removal shovel; 23. Reciprocating screw; 24. Torsion spring; 25. Gear shaft; 26. Half transmission gear; 27. Second gear; 28. First motor; 29. ​​Second motor; 30. First gear. Detailed Implementation

[0037] 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.

[0038] Please see Figure 1-10 A flame-retardant conveyor belt processing scraping device includes a frame 1, and further includes:

[0039] A conveying mechanism for continuous conveying of the flame-retardant conveyor belt 2;

[0040] like Figure 1 As shown, the conveying mechanism includes two guide rollers 10 symmetrically rotatably connected between the inner surfaces of the frame 1. The frame 1 conveys a flame-retardant conveyor belt 2 through the guide rollers 10. A vertical processing section is fixedly provided on the flame-retardant conveyor belt 2 at the position corresponding to the two guide rollers 10. A conveying motor 11 is fixedly installed on the side of the frame 1. The output shaft end of the conveying motor 11 is fixedly connected to a guide roller 10.

[0041] During the scraping operation, the flame-retardant conveyor belt 2 moves at a set speed, thereby enabling the scraping mechanism to scrape the flame-retardant conveyor belt 2.

[0042] Two symmetrically arranged glue-scraping mechanisms, with an adjustable spacing between them;

[0043] The guide shaft 3 is rotatably connected to the frame 1 and driven by the first motor 28;

[0044] The negative pressure suction assembly uses negative pressure to remove paste.

[0045] The paste scraping mechanism includes a scraper frame 4;

[0046] A pitch adjustment screw 12 driven by a second motor 29 is rotatably connected to the frame 1. The pitch adjustment screw 12 is symmetrically provided with a positive thread area a and a negative thread area a. The positive thread area a and the negative thread area a are respectively connected to the scraper frame 4 in the two scraping mechanisms.

[0047] The inner cylinder 5 and the linkage module linked with the guide shaft 3 are fixedly installed on the scraper frame 4. A feed port 6 is opened at the top of the inner cylinder 5. A rotating cylinder 7 is rotatably sleeved on the inner cylinder 5. Both the inner cylinder 5 and the rotating cylinder 7 are driven by the linkage module.

[0048] The inner cylinder 5 is rotatably connected to a negative pressure shaft cylinder 8, which is connected to the negative pressure suction assembly, at the axial position.

[0049] Please see Figure 3 The linkage module includes a transmission sleeve 13 and a coupling 14 rotatably connected to the scraper 4, and the transmission sleeve 13 is driven by the guide shaft 3.

[0050] The transmission sleeve 13 has a fixed shaft groove with openings at both ends and slidably connected to the guide shaft 3. The cross-sections of the shaft groove and the guide shaft 3 are both regular polygons.

[0051] By setting the shaft groove and the guide shaft 3 with a regular polygonal cross section, the transmission sleeve 13 can be continuously driven by the guide shaft 3 during the movement of the transmission sleeve 13 along the position of the guide shaft 3.

[0052] Both the coupling 14 and the transmission sleeve 13 are fixedly installed with linkage bevel teeth. The two linkage bevel teeth mesh with each other. The coupling 14 is respectively connected to a first chain belt and a second chain belt. The first chain belt is connected to the indexing cylinder 7 and the second chain belt is connected to the negative pressure shaft cylinder 8.

[0053] The rotation speed of the negative pressure shaft cylinder 8 is 5 times that of the rotation speed of the indexing cylinder 7;

[0054] An internal gear ring 9 is fixedly installed on the negative pressure shaft cylinder 8, and a set of scraping modules arranged in a circumferential array and connected to the internal gear ring 9 are installed on the indexing cylinder 7.

[0055] By setting the rotational speed difference between the negative pressure shaft cylinder 8 and the indexing cylinder 7, the transmission ratio of the internal gear ring 9 can be effectively improved.

[0056] Please see Figure 1 , Figure 2 and Figure 10 The negative pressure suction assembly includes a storage tank 15 connected to the frame 1, a suction pump 16 fixedly connected to the storage tank 15, a three-way hose 17 fixedly connected to the negative pressure port of the suction pump 16, a negative pressure suction channel connected to the three-way hose 17 opened inside the negative pressure shaft cylinder 8, and a set of negative pressure suction holes 18 arranged in a circumferential array and connected to the negative pressure suction channel opened on the negative pressure shaft cylinder 8.

[0057] By setting up the suction pump 16 and the negative pressure suction hole 18, the paste scraped off the flame retardant conveyor belt 2 is removed and collected under negative pressure.

[0058] Please see Figure 4 and Figure 5 The scraping module includes a scraping frame 19 fixedly connected to the rotating cylinder 7. A material leakage port 20 is provided on the rotating cylinder 7 and at a position adjacent to the scraping frame 19. A scraping notch 21 adapted to the width of the flame-retardant conveyor belt 2 is fixedly provided in the middle of the scraping frame 19.

[0059] During the scraping operation, when the discharge port 20 and the feed port 6 are in communication, the scraped paste leaks into the inner cylinder 5 through the discharge port 20, and is then suctioned out by negative pressure through the negative pressure suction hole 18 on the negative pressure shaft cylinder 8.

[0060] The inner wall of the indexing cylinder 7 is rotatably connected to a reciprocating drive component that is connected to the internal gear ring 9. The inner wall of the scraper frame 19 is slidably connected to two symmetrically arranged material removal shovels 22. The distance between the two material removal shovels 22 is changed reciprocally by the reciprocating drive component.

[0061] Please see Figure 5 , Figure 6 , Figure 7 and Figure 8 The reciprocating drive includes a reciprocating lead screw 23 rotatably connected between the inner surfaces of the indexing cylinder 7. A torsion spring 24 is fixedly installed at the rotatable connection between the reciprocating lead screw 23 and the indexing cylinder 7. A positive thread area b and a negative thread area b are symmetrically arranged on the reciprocating lead screw 23. The positive thread area b and the negative thread area b are respectively connected to two material removal shovels 22 on the scraping module. A first gear 30 is fixedly installed on the reciprocating lead screw 23. A gear shaft 25 is rotatably connected to the side of the indexing cylinder 7. A half transmission gear 26 and a second gear 27 are respectively fixedly installed on the gear shaft 25. The half transmission gear 26 is connected to the first gear 30, and the second gear 27 is connected to the internal gear ring 9.

[0062] The radius of the half-gear 26 is 8 times the radius of the first gear 30;

[0063] By setting the half-gear 26 and torsion spring 24, the reciprocating screw 23 can reciprocate forward and reverse within a set cycle after the internal gear ring 9 outputs a rotational speed. The reciprocating screw 23 can drive the distance between the two material removal shovels 22 to change reciprocally within a set cycle.

[0064] By repeatedly changing the distance between the two scraper blades 22, the paste scraped from the scraper frame 19 can be quickly collected and discharged. Through the aforementioned rapid collection and discharge effect, on the one hand, the adhesion rate of the paste on the inner wall of the scraper frame 19 can be effectively reduced, thereby preventing the paste from overflowing from the scraper frame 19 during continuous scraping. On the other hand, the scraping effect of the paste can be effectively improved.

[0065] Before operation, the distance between the two scraping mechanisms is adjusted according to the width of the flame-retardant conveyor belt 2. After the distance between the two scraping mechanisms is adjusted, the flame-retardant conveyor belt 2 moves and conveys at a set speed. When the flame-retardant conveyor belt 2 is conveying, the guide shaft 3 outputs a rotational speed in a set state. After the guide shaft 3 outputs a rotational speed, on the one hand, multiple scraping modules on the rotary drum 7 can revolve. Through the revolve motion of the scraping modules, multiple scraping modules can circulate and scrape off the paste on the outer edge of the flame-retardant conveyor belt 2. On the other hand, the revolve motion of multiple scraping modules generates... During production, the reciprocating screw 23 reciprocates in both forward and reverse directions within a set cycle. After the reciprocating screw 23 reciprocates in both forward and reverse directions within the set cycle, the distance between the two scraper 22 can be changed back and forth. By changing the distance between the two scraper 22 back and forth, the paste scraped on the scraper frame 19 can be quickly collected and discharged. Through the realization of the above-mentioned rapid collection and discharge effect, on the one hand, the adhesion rate of the paste on the inner wall of the scraper frame 19 can be effectively reduced, thereby avoiding the paste overflowing from the scraper frame 19 when scraping continuously. On the other hand, the scraping effect of the paste can be effectively improved.

[0066] 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, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fire-retardant conveyor belt processing paste scraping device comprising a frame (1), characterized in that, Also include: Conveying mechanism for continuous conveying of fire-retardant conveying belt (2); Two symmetrically arranged paste scraping mechanisms, the distance between the two paste scraping mechanisms is adjustable; Guide shaft rod (3) is rotatably connected to the rack (1) and driven by the first motor (28); Negative pressure paste suction assembly realizes negative pressure suction of paste through negative pressure; The paste scraping mechanism includes a scraper frame (4), an inner cylinder (5) and a linkage module connected to the guide shaft rod (3) are fixedly installed on the scraper frame (4), a feeding port (6) is formed at the top of the inner cylinder (5), a shift cylinder (7) is rotatably arranged on the inner cylinder (5), the inner cylinder (5) and the shift cylinder (7) are driven by the linkage module, the axis position of the inner cylinder (5) is rotatably connected with the negative pressure shaft cylinder (8) which is in communication with the negative pressure paste suction assembly, the inner gear ring (9) is fixedly installed on the negative pressure shaft cylinder (8), a group of scraping modules are arranged in a circumferential array on the shift cylinder (7) and are in transmission connection with the inner gear ring (9). The scraping module includes a scraper frame (19) fixedly connected with the shift cylinder (7), a material leakage port (20) is formed at the position of the shift cylinder (7) adjacent to the scraper frame (19), a paste scraping gap (21) is fixedly arranged on the middle part of the scraper frame (19) and is matched with the width of the fire-retardant conveying belt (2), a reciprocating driving member in transmission connection with the inner gear ring (9) is rotatably connected to the inner wall of the shift cylinder (7), two symmetrically arranged material removing shovels (22) are slidably connected to the inner wall of the scraper frame (19), and the distance between the two material removing shovels (22) is changed by the reciprocating driving member.

2. A fire resistant conveyor belt processing paste scraping device according to claim 1, wherein: The conveying mechanism includes two guide rollers (10) symmetrically rotatably connected between the inner surfaces of the rack (1), the fire-retardant conveying belt (2) is conveyed through the guide rollers (10), the fire-retardant conveying belt (2) is fixedly provided with a vertical processing section at the position corresponding to the two guide rollers (10), and the conveying motor (11) is fixedly installed on the side surface of the rack (1). The output shaft end of the conveying motor (11) is fixedly connected with a guide roller (10).

3. A fire resistant conveyor belt processing paste scraping device according to claim 2, wherein: The rack (1) is rotatably connected with a pitch adjusting lead screw (12) driven by a second motor (29), the pitch adjusting lead screw (12) is symmetrically provided with a positive thread area a and a reverse thread area a, and the positive thread area a and the reverse thread area a are in transmission connection with the scraper frames (4) in the two paste scraping mechanisms, respectively.

4. A fire resistant conveyor belt processing paste scraping device according to claim 3, wherein: The linkage module includes a transmission sleeve (13) and a coupling shaft (14) rotatably connected to the scraper frame (4), the transmission sleeve (13) is driven by the guide shaft rod (3), the coupling shaft (14) and the transmission sleeve (13) are both fixedly installed with linkage bevel gears, the two linkage bevel gears are in meshing with each other, the coupling shaft (14) is respectively in transmission connection with a first chain belt and a second chain belt, the first chain belt is in transmission connection with the shift cylinder (7), and the second chain belt is in transmission connection with the negative pressure shaft cylinder (8).

5. A fire resistant conveyor belt processing paste scraping device according to claim 4, wherein: The inside of the transmission sleeve (13) is fixed with an axle slot with two open ends and is in sliding connection with the guide axle rod (3), the cross sections of the axle slot and the guide axle rod (3) are regular polygons, and the rotational speed of the negative pressure axle cylinder (8) is 5 times that of the indexing cylinder (7).

6. A fire resistant conveyor belt processing paste scraping device according to claim 5, wherein: The negative pressure paste suction assembly comprises a storage tank (15) connected with the rack (1), the storage tank (15) is fixedly and communicatively connected with a suction pump (16), a negative pressure port of the suction pump (16) is fixedly and communicatively connected with a three-way hose (17), the negative pressure axle cylinder (8) is provided with a negative pressure suction channel in communication with the three-way hose (17), and the negative pressure axle cylinder (8) is provided with a plurality of negative pressure suction holes (18) in circumferential array and in communication with the negative pressure suction channel.

7. A fire resistant conveyor belt processing paste scraping device according to claim 6, wherein: The reciprocating driving member comprises a reciprocating screw rod (23) rotationally connected between the inner surfaces of the indexing cylinder (7), the reciprocating screw rod (23) is fixedly provided with a torsion spring (24) at the rotationally connected position with the indexing cylinder (7), the reciprocating screw rod (23) is symmetrically provided with a positive screw thread area b and a reverse screw thread area b, the positive screw thread area b and the reverse screw thread area b are respectively in transmission connection with the two material removing shovels (22) of the material removing module, the reciprocating screw rod (23) is fixedly provided with a first gear (30), the indexing cylinder (7) is rotationally connected with a gear shaft (25) on the side surface, the gear shaft (25) is respectively fixedly provided with a half transmission gear (26) and a second gear (27), the half transmission gear (26) is in transmission connection with the first gear (30), and the second gear (27) is in transmission connection with the inner gear ring (9).

8. A fire resistant conveyor belt processing paste scraping device according to claim 7, wherein: The radius of the half transmission gear (26) is 8-10 times that of the first gear (30).

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