CN112718551A

CN112718551A - Automatic select separately formula agricultural product processing is with pesticide residue concentration detection device

Info

Publication number: CN112718551A
Application number: CN202011448428.4A
Authority: CN
Inventors: 纪在克
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-04-30

Abstract

The invention discloses an automatic sorting type pesticide residue concentration detection device for processing agricultural products, which comprises a supporting table, an adjusting motor and a pesticide concentration detector, wherein the inner side of the supporting table is in bearing connection with a wheel shaft, the outer side of the wheel shaft is provided with a belt pulley, the outer side of the belt pulley is provided with a steel plate conveying belt in an attaching mode, the front end of the wheel shaft is in key connection with a driven gear, the upper side of the driven gear is in meshing connection with a driving gear, the inner side of the driving gear is in key connection with a driving rotating rod, and the front end of the driving rotating rod is connected with the output. This automatic pesticide residue concentration detection device is used in processing of sorting formula agricultural product utilizes the equidistant distribution's on the steel sheet conveyer belt place the platform and carry the processing to melon and fruit continuation nature, and the use of cooperation locating plate and first spring can be injectd the position of melon and fruit, avoids sliding by oneself at the in-process melon and fruit of carrying, can be stable carry the work efficiency of device to melon and fruit.

Description

Automatic select separately formula agricultural product processing is with pesticide residue concentration detection device

Technical Field

The invention relates to the technical field of agricultural product processing, in particular to an automatic sorting type agricultural product processing pesticide residue concentration detection device.

Background

Agricultural products are edible articles obtained by processing products harvested by agricultural activities through multiple processes, are one of main edible sources of people, can provide abundant required nutrient components for people, contain a plurality of types of agricultural products, comprise grains, vegetables, fruits and the like, have different nutrient components, are eaten by people in a balanced manner, can keep balanced nutrition, and are processed for the use safety of people when processing melon and fruit articles in the agricultural products, so that the concentration of pesticide remained outside melons and fruits needs to be detected.

The utility model is CN 207263626U's a portable pesticide residue concentration detection device can integrate, the realization is to the accuracy of melon and fruit vegetables surface residual pesticide, the rapid survey, utilize spectral analysis and imaging technique that combines together to detect melon and fruit, agricultural product surface pesticide residue concentration such as vegetables, it can integrate and portable to realize pesticide residue concentration detection device, nevertheless, be unfavorable for measuring agricultural product of batch and continuity, intensity of labour is higher, need consume a large amount of time and energy, and can not automize and select separately the higher melon and fruit of concentration content, need increase subsequent sorting step, and the reduction machining efficiency.

Therefore, we propose an automatic sorting type agricultural product processing pesticide residue concentration detection device so as to solve the above-mentioned problems.

Disclosure of Invention

The invention aims to provide an automatic sorting type pesticide residue concentration detection device for processing agricultural products, which solves the problems that the pesticide residue concentration detection device in the market at present is not beneficial to detecting agricultural products in batches and continuously and can not automatically sort melons and fruits with high concentration content, wherein the problems are provided by the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: an automatic sorting type pesticide residue concentration detection device for processing agricultural products comprises a supporting table, an adjusting motor and a pesticide concentration detector, wherein an inner side bearing of the supporting table is connected with a wheel shaft, a belt pulley is arranged on the outer side of the wheel shaft, a steel plate conveying belt is attached to the outer side of the belt pulley, a driven gear is in keyed connection with the front end of the wheel shaft, a driving gear is in meshed connection with the upper side of the driven gear, an inner side key of the driving gear is connected with a driving rotating rod, the front end of the driving rotating rod is connected with the output end of a transmission motor, a mounting plate is fixed on the outer side of the steel plate conveying belt through bolts, a placing table is arranged on the outer side of the mounting plate, a lead screw is connected with the inner side bearing of the placing table, a connecting rotating rod is connected with the rear side bearing of the, a connecting rod is installed on the upper side of the adjusting seat, a clamping groove is formed in the inner side of the screw rod, a push plate is connected to the upper end of the connecting rod, fixing plates are welded to the left end and the right end of the placing table respectively, the inner sides of the fixing plates are connected with positioning plates through first springs, the adjusting motor is fixed to the rear side of the supporting table through bolts, an adjusting rotating rod is connected to the output end of the adjusting motor, an adjusting gear is connected to the outer side of the adjusting rotating rod through a key, a connecting plate is installed on the rear side of the inner side of the supporting table, a tooth block is connected to the lower side of the connecting plate, idler wheels are installed at the front end and the rear end of the connecting rotating rod, a supporting frame is fixedly installed on the upper side of the supporting table, a hydraulic cylinder is fixed to the upper side of the, and the right lower side of the supporting platform is connected with a second collecting box.

Preferably, the outer diameter of the driven gear is one fourth of the outer diameter of the driving gear, the number of teeth of the driven gear is one half of the number of teeth of the driving gear, and the driving gear is of a half-tooth structure.

Preferably, the mounting plates are distributed on the outer side surface of the steel plate conveying belt at equal intervals, and the width of each mounting plate is smaller than the outer diameter of the belt pulley.

Preferably, the side view surface of the placing table is in a convex structure, and the length of a horizontal connecting line of the central points of the adjacent 2 placing tables is 2 times of the outer diameter of the belt pulley.

Preferably, the push pedal with place the platform and be sliding connection, and the contact department of push pedal and locating plate is smooth arc structure to the tip position of the section of bowing of locating plate is the slope form and distributes, and the locating plate constitutes elastic construction through first spring and fixed plate simultaneously.

Preferably, the connecting rotating rod comprises a mounting groove, a second spring and a clamping plate, the mounting groove is formed in the connecting rotating rod, the second spring is mounted inside the mounting groove, the outer end of the second spring is connected with the clamping plate, the side view surface of the connecting rotating rod is of a T-shaped structure, and the connecting rotating rod penetrates through the inside of the screw rod.

Preferably, the rear section of the clamping plate is of a T-shaped structure, the contact part of the clamping plate and the screw rod is of a smooth arc structure, the clamping plate forms an elastic structure with the mounting groove through a second spring, and the inner side of the screw rod is provided with clamping grooves at equal angles.

Preferably, the tooth blocks are distributed on the lower side surface of the connecting plate at equal intervals, and the horizontal distance between the left end part of the connecting plate and the right end part of the adjusting gear is larger than zero.

Compared with the prior art, the invention has the beneficial effects that: the automatic sorting type pesticide residue concentration detection device for processing agricultural products,

(1) utilize equidistant distribution's on the steel sheet conveyer belt to place the platform and carry out the processing of continuation transport to the melon and fruit, the use of cooperation locating plate and first spring, can prescribe a limit to the position of melon and fruit, avoid melon and fruit slip by oneself in the in-process of carrying, can be stable carry the melon and fruit, the work efficiency of the device is improved, and the use of cooperation half dentate driving gear and driven gear, but intermittent type nature carry the melon and fruit, reserve the check-out time, can be accurate detect, this process need not artifical the assistance, the degree of automation is high, the convenience of operation is high;

(2) utilize pesticide concentration detector to detect the melon and fruit, and to detect on signal transmission to the controller, can be according to the concentration qualified data contrast of independently adjusting, control adjustment motor drive adjusting gear rotates, thereby drive gear drives and connects bull stick and lead screw rotation, move the push pedal, the push pedal extrudees the locating plate in step, it is spacing to the melon and fruit to relieve the locating plate, promote the melon and fruit simultaneously, with the melon and fruit separation to first collecting box in, realize the automatic separation of melon and fruit, the follow-up staff of being convenient for directly handles unqualified melon and fruit, reduce staff's the amount of labour, and reduce the process flow of melon and fruit, degree of autonomy is high, the convenience of use is high.

Drawings

FIG. 1 is a schematic side view of the present invention;

FIG. 2 is an enlarged view of the structure at A in FIG. 1 according to the present invention;

FIG. 3 is a schematic side sectional view of the support table of the present invention;

FIG. 4 is a schematic side sectional view of the placement table of the present invention;

FIG. 5 is a schematic top view of a support stage according to the present invention;

FIG. 6 is a schematic view of a support platform of the present invention in a top-down view;

FIG. 7 is a schematic view of a support table according to the present invention;

FIG. 8 is a front view of the connecting plate of the present invention;

FIG. 9 is a side view of the connecting rod of the present invention;

FIG. 10 is a schematic view of a rear section of the connecting rod of the present invention.

In the figure: 1. a support table; 2. a wheel axle; 3. a belt pulley; 4. a steel plate conveyer belt; 5. a driven gear; 6. an active rotating rod; 7. a transfer motor; 8. mounting a plate; 9. a placing table; 10. a roller; 11. a screw rod; 12. an adjusting seat; 13. a connecting rod; 14. pushing the plate; 15. a fixing plate; 16. a first spring; 17. positioning a plate; 18. an adjusting gear; 19. connecting the rotating rod; 1901. mounting grooves; 1902. a second spring; 1903. clamping a plate; 20. a transmission gear; 21. a card slot; 22. a support plate; 23. a connecting plate; 24. a tooth block; 25. adjusting the rotating rod; 26. adjusting the motor; 27. a driving gear; 28. a first collection tank; 29. a second collection tank; 30. a support frame; 31. a pesticide concentration detector; 32. and a hydraulic cylinder.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-10, the present invention provides a technical solution: an automatic sorting type pesticide residue concentration detection device for processing agricultural products comprises a supporting table 1, a wheel shaft 2, a belt pulley 3, a steel plate conveying belt 4, a driven gear 5, a driving rotating rod 6, a conveying motor 7, a mounting plate 8, a placing table 9, rollers 10, a screw rod 11, an adjusting seat 12, a connecting rod 13, a push plate 14, a fixing plate 15, a first spring 16, a positioning plate 17, an adjusting gear 18, a connecting rotating rod 19, a mounting groove 1901, a second spring 1902, a clamping plate 1903, a transmission gear 20, a clamping groove 21, a supporting plate 22, a connecting plate 23, a gear block 24, an adjusting rotating rod 25, an adjusting motor 26, a driving gear 27, a first collecting box 28, a second collecting box 29, a supporting frame 30, a pesticide concentration detector 31 and a hydraulic cylinder 32, wherein the inner side bearing of the supporting table 1 is connected with the wheel shaft 2, the belt pulley 3 is mounted on the outer side, the front end key of the wheel shaft 2 is connected with a driven gear 5, the upper side of the driven gear 5 is engaged and connected with a driving gear 27, the inner side key of the driving gear 27 is connected with a driving rotating rod 6, the front end of the driving rotating rod 6 is connected with the output end of a conveying motor 7, the outer side of a steel plate conveying belt 4 is fixed with a mounting plate 8 through bolts, the outer side of the mounting plate 8 is provided with a placing table 9, the inner side bearing of the placing table 9 is connected with a lead screw 11, the rear side bearing of the placing table 9 is connected with a connecting rotating rod 19, the end key of the connecting rotating rod 19 is connected with a transmission gear 20, the outer side of the lead screw 11 is in threaded connection with an adjusting seat 12, the upper side of the adjusting seat 12 is provided with a connecting rod 13, the inner side of the lead screw 11 is provided with a clamping groove 21, the upper end of the, adjusting motor 26 bolt fastening is in the rear side of brace table 1, and adjusting motor 26's output is connected with the regulation bull stick 25, the outside key-type connection of regulation bull stick 25 has adjusting gear 18, connecting plate 23 is installed to the inboard rear side of brace table 1, and the downside of connecting plate 23 is connected with tooth piece 24, gyro wheel 10 is all installed at both ends around connecting bull stick 19, the upside fixed mounting of brace table 1 has support frame 30, and the upside bolt fastening of support frame 30 has pneumatic cylinder 32, pesticide concentration detector 31 fixed mounting is at the lower extreme of pneumatic cylinder 32, backup pad 22 is installed to the inboard of brace table 1 upper end, and the front side bolt fastening at brace table 1 middle part has first collecting box 28, the right downside of brace table 1 is connected with second collecting box 29.

In this embodiment, the outer diameter of the driven gear 5 is one fourth of the outer diameter of the driving gear 27, the number of teeth of the driven gear 5 is one half of the number of teeth of the driving gear 27, and the driving gear 27 is a half-tooth structure, so that the driving gear 27 rotates once to drive the driven gear 5 to rotate twice, and the half-tooth structure of the driving gear 27 is used to drive the driven gear 5 intermittently;

the mounting plates 8 are distributed on the outer side surface of the steel plate conveying belt 4 at equal intervals, and the width of each mounting plate 8 is smaller than the outer diameter of the belt pulley 3, so that the mounting plates 8 can smoothly span the belt pulleys 3 when moving along with the steel plate conveying belt 4, and the placing table 9 can be conveyed smoothly and continuously;

the side view of the placing table 9 is of a convex structure, the length of a horizontal connecting line of the central points of the adjacent 2 placing tables 9 is 2 times of the outer diameter of the belt pulley 3, the design can ensure that the belt pulley 3 rotates for two circles, and the placing table 9 is moved to the position below the pesticide concentration detector 31;

the push plate 14 is in sliding connection with the placing table 9, the contact part of the push plate 14 and the positioning plate 17 is of a smooth arc structure, the end part of the depression section of the positioning plate 17 is distributed in an inclined shape, and the positioning plate 17 and the fixing plate 15 form an elastic structure through the first spring 16, so that the friction force between the push plate 14 and the positioning plate 17 can be reduced, the push plate 14 can be guaranteed to smoothly move between 2 adjacent positioning plates 17, and the positioning plate 17 is extruded;

the connecting rotating rod 19 comprises a mounting groove 1901, a second spring 1902 and a clamping plate 1903, the mounting groove 1901 is formed in the connecting rotating rod 19, the second spring 1902 is mounted in the mounting groove 1901, the clamping plate 1903 is connected to the outer end of the second spring 1902, the side view surface of the connecting rotating rod 19 is of a T-shaped structure, and the connecting rotating rod 19 penetrates through the inside of the screw rod 11, the connecting rotating rod 19 and the screw rod 11 are connected through the design, and the screw rod 11 can be driven to rotate synchronously by the rotation of the connecting rotating rod 19;

the rear section of the clamping plate 1903 is of a T-shaped structure, the contact part of the clamping plate 1903 and the lead screw 11 is of a smooth arc structure, the clamping plate 1903 and the mounting groove 1901 form an elastic structure through a second spring 1902, and clamping grooves 21 are distributed on the inner side of the lead screw 11 at equal angles, so that the connection mode between the clamping plate 1903 and the lead screw 11 can be flexibly adjusted, the clamping plate 1903 can be ensured to slide on the inner side of the lead screw 11, and the locking of the connecting rotating rod 19 and the lead screw 11 can be released according to actual conditions;

the tooth blocks 24 are distributed on the lower side surface of the connecting plate 23 at equal intervals, the horizontal distance between the left end of the connecting plate 23 and the right end of the adjusting gear 18 is larger than zero, and the tooth blocks 24 can be used for driving the adjusting gear 18 to rotate to realize self-driving of the adjusting gear 18.

The working principle is as follows: when the automatic sorting type pesticide residue concentration detection device for processing agricultural products is used, firstly, a user firstly places the whole device shown in fig. 1 into a working area stably, as shown in a combined view of fig. 5, melons and fruits are placed on the placing table 9 and gradually extrude the positioning plates 17, the positioning plates 17 extrude the first springs 16, the distance between the positioning plates 17 is increased, the melons and fruits are placed between the positioning plates 17, the positioning plates 17 are utilized to limit the melons and fruits, the fruits and the fruits are prevented from sideslipping in the conveying process, as shown in a combined view of fig. 3, the conveying motor 7 is powered on, the conveying motor 7 is controlled to drive the driving rotating rod 6 to rotate slowly, the driving rotating rod 6 drives the driving gear 27 installed on the outer side to rotate anticlockwise in the direction shown in fig. 7, when the driving gear 27 rotates to be meshed and connected with the driven gear 5, the driven gear 5 can be, the driven gear 5 drives the wheel shaft 2 to rotate in the same direction, the wheel shaft 2 drives the belt pulley 3 to rotate, the steel plate conveying belt 4 is controlled to move, the placing table 9 is controlled to move rightwards, when the placing table 9 moves to the position below the pesticide concentration detector 31, the driving gear 27 rotates to be disengaged from the driven gear 5 and is connected with the driven gear 5, the steel plate conveying belt 4 stops moving, conveying of the placing table 9 is stopped, the pesticide concentration detector 31 is switched on to start working, pesticide concentration detection is carried out on melons and fruits on the placing table 9 by using the pesticide concentration detector 31, meanwhile, workers can limit the rest melons and fruits to the placing table 9 at corresponding positions according to the steps, subsequent continuity detection is facilitated, when the pesticide concentration detector 31 detects that the pesticide concentration of the melons and fruits exceeds a qualified index, signals can be transmitted to the controller, and the controller gives an alarm, and controlling the adjusting motor 26 to start working, the adjusting motor 26 driving the adjusting rotating rod 25 to rotate, the adjusting rotating rod 25 driving the adjusting gear 18 to rotate, as shown in fig. 2, the adjusting gear 18 driving the transmission gear 20 in meshing connection to rotate, the transmission gear 20 driving the connecting rotating rod 19 shown in fig. 4 to rotate, thereby controlling the screw rod 11 to rotate, the screw rod 11 driving the adjusting seat 12 in external threaded connection to move, the adjusting seat 12 driving the connecting rod 13 to control the push plate 14 to move, when the push plate 14 moves, the push plate 14 gradually pushes and pushes the positioning plate 17 to release the position limitation of the positioning plate 17 on the melon and fruit, simultaneously pushing the melon and fruit, pushing and collecting the melon and fruit with too high pesticide residue concentration into the first collecting box 28, the pesticide residue with too high concentration can not be detected by the pesticide concentration detector 31, and then stopping the operation of the adjusting motor 26, when the steel plate conveying belt 4 is moved again according to the above, the novel melon and fruit can be moved to the pesticide concentration detector 31 for detection, the placing table 9 below the pesticide concentration detector 31 continues to move rightwards, and when the transmission gear 20 moves to be meshed and connected with the connecting plate 23, the transmission gear 20 can be controlled to move reversely, so that the connecting rotating rod 19 is controlled to drive the screw rod 11 to move reversely, the push plate 14 is controlled to reset, and subsequent continuous use is facilitated;

when the pesticide concentration detector 31 detects that the pesticide residue concentration of the melons and fruits is within the qualified range, the melons and fruits are continuously placed on the placing table 9 and move rightwards along with the steel plate conveying belt 4, when the transmission gear 20 moves to be meshed and connected with the connecting plate 23, the position of the push plate 14 does not move, so that the lead screw 11 is clamped and does not stand still, as shown in the combined figure 10, the connecting rotating rod 19 rotates, the lead screw 11 extrudes and pushes the clamping plate 1903, the clamping plate 1903 extrudes the second spring 1902, smooth rotation of the connecting rotating rod 19 is ensured, smooth movement of the steel plate conveying belt 4 and the placing table 9 is ensured, the melons and fruits are conveyed, when the melons and fruits are conveyed to the rightmost end, due to the gravity of the melons and fruits, the melons and fruits can fall into the second collecting box 29 from the placing table 9 to be collected, the sorting of the melons and fruits is realized, only, the centralized cleaning of the melons and fruits is carried out, which is the working process of the whole device, and the content which is not described in detail in the specification belongs to the prior art which is known by the professional technicians in the field.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides an automatic select separately formula agricultural product processing is with pesticide residue concentration detection device, includes brace table (1), accommodate motor (26) and pesticide concentration detection appearance (31), its characterized in that: the inner side bearing of the supporting table (1) is connected with a wheel shaft (2), a belt pulley (3) is installed on the outer side of the wheel shaft (2), a steel plate conveying belt (4) is attached to the outer side of the belt pulley (3), the front end of the wheel shaft (2) is in keyed connection with a driven gear (5), a driving gear (27) is in meshed connection with the upper side of the driven gear (5), an inner side key of the driving gear (27) is connected with a driving rotating rod (6), the front end of the driving rotating rod (6) is connected with the output end of a conveying motor (7), a mounting plate (8) is fixed on the outer side of the steel plate conveying belt (4) through bolts, a placing table (9) is installed on the outer side of the mounting plate (8), the inner side bearing of the placing table (9) is connected with a lead screw (11), a rear bearing of the placing table (9) is connected with a connecting rotating rod (, the outer side of the screw rod (11) is in threaded connection with an adjusting seat (12), a connecting rod (13) is installed on the upper side of the adjusting seat (12), a clamping groove (21) is formed in the inner side of the screw rod (11), a push plate (14) is connected to the upper end of the connecting rod (13), fixing plates (15) are welded to the left end and the right end of the placing table (9), a positioning plate (17) is connected to the inner side of the fixing plate (15) through a first spring (16), an adjusting motor (26) is fixed to the rear side of the supporting table (1) through bolts, the output end of the adjusting motor (26) is connected with an adjusting rotating rod (25), an adjusting gear (18) is connected to the outer side key of the adjusting rotating rod (25), a connecting plate (23) is installed on the inner rear side of the supporting table (1), a tooth block (24) is connected to the lower side of the connecting plate (23, the pesticide concentration detector is characterized in that a support frame (30) is fixedly mounted on the upper side of the support table (1), a hydraulic cylinder (32) is fixed on the upper side of the support frame (30) through bolts, a pesticide concentration detector (31) is fixedly mounted at the lower end of the hydraulic cylinder (32), a support plate (22) is mounted on the inner side of the upper end of the support table (1), a first collecting box (28) is fixed on a front side bolt in the middle of the support table (1), and a second collecting box (29) is connected to the lower right side of the support table (1).

2. The apparatus for detecting the concentration of a pesticide residue for processing an automatically sorted agricultural product according to claim 1, wherein: the outer diameter of the driven gear (5) is one fourth of the outer diameter of the driving gear (27), the number of teeth of the driven gear (5) is one half of the number of teeth of the driving gear (27), and the driving gear (27) is of a half-tooth-shaped structure.

3. The apparatus for detecting the concentration of a pesticide residue for processing an automatically sorted agricultural product according to claim 1, wherein: the mounting plates (8) are distributed on the outer side surface of the steel plate conveying belt (4) at equal intervals, and the width of the mounting plates (8) is smaller than the outer diameter of the belt pulley (3).

4. The apparatus for detecting the concentration of a pesticide residue for processing an automatically sorted agricultural product according to claim 1, wherein: the side surface of the placing table (9) is of a convex structure, and the length of a horizontal connecting line of the central points of the adjacent 2 placing tables (9) is 2 times of the outer diameter of the belt pulley (3).

5. The apparatus for detecting the concentration of a pesticide residue for processing an automatically sorted agricultural product according to claim 1, wherein: the push plate (14) is in sliding connection with the placing table (9), the contact position of the push plate (14) and the positioning plate (17) is of a smooth arc structure, the end position of the depression section of the positioning plate (17) is distributed in an inclined mode, and meanwhile the positioning plate (17) and the fixing plate (15) form an elastic structure through a first spring (16).

6. The apparatus for detecting the concentration of a pesticide residue for processing an automatically sorted agricultural product according to claim 1, wherein: connect bull stick (19) including mounting groove (1901), second spring (1902) and cardboard (1903), and connect the inside of bull stick (19) and seted up mounting groove (1901) to the internally mounted of mounting groove (1901) has second spring (1902), and the outer end of second spring (1902) is connected with cardboard (1903) simultaneously, the profile view face of connecting bull stick (19) is "T" shape structure, and connects the inside that bull stick (19) run through lead screw (11).

7. The apparatus for detecting the concentration of a pesticide residue for processing an automatically sorted agricultural product according to claim 6, wherein: the back section of cardboard (1903) is "T" shape structure, and the contact department of cardboard (1903) and lead screw (11) is smooth arc structure to cardboard (1903) constitute elastic construction through second spring (1902) and mounting groove (1901), and the inboard of lead screw (11) is equant to be distributed simultaneously has draw-in groove (21).

8. The apparatus for detecting the concentration of a pesticide residue for processing an automatically sorted agricultural product according to claim 1, wherein: the tooth blocks (24) are distributed on the lower side surface of the connecting plate (23) at equal intervals, and the horizontal distance between the left end of the connecting plate (23) and the right end of the adjusting gear (18) is larger than zero.