A stepless travel switch connecting mechanism arranged on a farm machine

Abstract

This utility model discloses a stepless limit switch connection mechanism installed on agricultural machinery, including a pull rod connecting frame, a power connection pull rod, a limit switch fixing frame, a limit switch, a swing link, and a telescopic control plate. An adjusting link and a torsion spring are fitted at the hinge joint between the swing link and the limit switch fixing frame. A pressure rod supported at the bottom of the power connection pull rod is provided on the adjusting link. A tension spring is provided between the adjusting link and the limit switch fixing frame. When the power connection pull rod moves upward, the tension spring releases its tension, causing the adjusting link to move the adjusting bolt and the swing link upward. The torsion spring stores energy. When the limit switch control plate touches the limit switch, it releases a signal. When the power connection pull rod moves downward, it causes the pressure rod and the adjusting link to move downward. The torsion spring releases its torque, causing the swing link to reset. The tension spring stores energy, causing the limit switch control plate to move back and forth, driving the limit switch to operate, thus achieving stable operation of the limit switch.

Description

Technical Field

[0001] This utility model belongs to the technical field of braking and starting devices for agricultural machinery, specifically relating to a stepless limit switch connection mechanism installed on agricultural machinery. Background Technology

[0002] Limit switches are mainly used in agricultural machinery to switch the working state of the circuit by changing the travel position of the mechanical moving parts, thereby achieving precise control and limit protection. The core components of the limit switch include the operating head, the contact system, and the housing. When the mechanical moving parts hit the operating head of the limit switch, the operating head is displaced and transmitted to the contact system through the internal transmission mechanism, causing the contacts to close or open, thereby sending an electrical control signal.

[0003] like Figure 1 The diagram shows the installation structure of a commonly used limit switch on agricultural machinery. The working principle of this limit switch assembly is as follows: The limit switch assembly is fixed to the pull rod connection position on the "fertilizer and seeder" via a mounting bracket. The lower part of its chain connects to the power connection pull rod, and the upper part connects to a tension spring and a ring. The ring is connected to the rocker arm on the rotary limit switch. The length of the chain is adjusted according to the working conditions of the fertilizer and seeder to ensure the upper and lower positions meet the requirements of the power connection pull rod. In actual use, due to the high dust levels in farmland and the significant vibration of the fertilizer and seeder, the rotary limit switch is constantly in an unstable working state, leading to various problems. It becomes difficult and inconvenient to use, has a short service life, low accuracy, and requires complicated chain length adjustment.

[0004] Therefore, a new stepless limit switch connection mechanism is needed on agricultural machinery to ensure the stability of rotary limit switches. Summary of the Invention

[0005] In view of this, the purpose of this utility model is to provide a stepless limit switch connection mechanism installed on agricultural machinery. This mechanism includes a limit switch, a swing linkage, a limit switch control board, an adjusting linkage, a tension spring, a torsion spring, an adjusting bolt, a pressure rod, and a power connection rod. When the power connection rod moves upward, it releases the tension spring, causing the adjusting linkage to move the adjusting bolt and the swing linkage upward. The torsion spring stores energy. When the limit switch control board touches the limit switch, it releases a signal. At this time, the power connection rod can still move upward. When the power connection rod moves downward, it causes the pressure rod and the adjusting linkage to move downward. The torsion spring releases torque, causing the swing linkage to reset. The tension spring stores energy, causing the limit switch control board to move back and forth, driving the limit switch to operate, thus achieving stable operation of the limit switch.

[0006] To achieve the above objectives, this utility model provides a stepless limit switch connection mechanism installed on agricultural machinery, comprising a pull rod connecting frame, a power connection pull rod hinged to the pull rod connecting frame, and a limit switch fixing frame installed on the pull rod connecting frame. The top of the limit switch fixing frame is provided with a limit switch and a limit switch control plate. A swing link is hinged to the lower part of the limit switch fixing frame. A telescopic control plate that works in conjunction with the limit switch is connected to the top of the swing link. An adjusting link and a torsion spring are fitted at the hinge point between the swing link and the limit switch fixing frame. One end of the torsion spring is connected to the swing link, and the other end is connected to the adjusting link. A pressure rod supported at the bottom of the power connection pull rod is provided at the other end of the adjusting link away from the swing link. A tension spring is provided between the adjusting link and the limit switch fixing frame. An adjusting bolt for connecting the agricultural machinery seed box is provided at the bottom of the swing link near the adjusting link.

[0007] Furthermore, a bolt post is provided on the lower side wall of the limit switch fixing bracket, and a hinge sleeve fitted on the bolt post is provided on the side wall of the swing link. A hinge seat is provided at the end of the adjusting link, and through holes for the hinge sleeve to pass through are provided on both sides of the hinge seat. A hinge bolt connected to the bolt post is provided on the other side wall of the swing link away from the hinge sleeve.

[0008] Furthermore, the telescopic control plate is provided with a connecting shaft at its top, and the swing linkage is provided with a connecting hole for accommodating the connecting shaft at its top. The end of the connecting shaft is connected with screws and washers for fixing it to the swing linkage.

[0009] Furthermore, an adjustment plate is provided on the side wall of the swing linkage, and the adjustment plate has adjustment holes evenly distributed along the arc for accommodating adjustment bolts.

[0010] Furthermore, the side wall of the swing linkage is provided with an arc-shaped groove and an adjustment plate mounting hole. An arc-shaped adjustment plate is connected to the adjustment plate mounting hole by a fixing bolt. The adjustment bolt is fixed to the end of the arc-shaped adjustment plate and extends through the arc-shaped groove to the adjustment linkage. The arc-shaped adjustment plate is provided with an arc-shaped adjustment groove for accommodating the fixing bolt.

[0011] Furthermore, the limit switch mounting bracket is provided with a tension spring adjusting plate, the tension spring adjusting plate is evenly distributed with tension spring mounting holes for attaching one end of the tension spring, and the adjusting connecting rod is provided with no less than 3 tension spring mounting holes I for attaching the other end of the tension spring.

[0012] Furthermore, the limit switch mounting bracket is provided with a front baffle and a rear baffle at the front and rear ends of the top of the swing linkage, respectively. The front baffle is provided with a telescopic control plate receiving groove for accommodating the movement of the telescopic control plate.

[0013] Furthermore, a limit part is provided at the lower part of the control board near the end, and a drive part is provided at the upper part near the middle to abut against the limit switch control board.

[0014] Furthermore, the top of the limit switch mounting bracket is provided with a limit switch and a limit switch control board mounting base, and the side wall of the mounting base is provided with a limit switch control groove for accommodating the limit switch control board.

[0015] Furthermore, the limit switch is configured as a micro limit switch.

[0016] The beneficial effects of this utility model are as follows:

[0017] This utility model relates to a stepless limit switch connection mechanism installed on agricultural machinery. It comprises a limit switch, a swing linkage, a limit switch control board, an adjusting linkage, a tension spring, a torsion spring, an adjusting bolt, a pressure rod, and a power connection rod. When the power connection rod moves upward, it releases the tension spring, causing the adjusting linkage to move the adjusting bolt and the swing linkage upward. The torsion spring stores energy. When the limit switch control board touches the limit switch, it releases a signal, allowing the power connection rod to continue moving upward. When the power connection rod moves downward, it causes the pressure rod and the adjusting linkage to move downward. The torsion spring releases its torque, resetting the swing linkage. The tension spring stores energy, causing the limit switch control board to move back and forth, driving the limit switch to operate and achieving stable operation of the limit switch. Attached Figure Description

[0018] Figure 1 An installation diagram of the existing limit switch connection mechanism;

[0019] Figure 2 This is an installation diagram of the stepless limit switch connection mechanism of this utility model installed on agricultural machinery;

[0020] Figure 3 This is a schematic diagram of the stepless limit switch connection mechanism installed on agricultural machinery according to this utility model;

[0021] Figure 4 This is a schematic diagram of the limit switch mounting bracket in the stepless limit switch connection mechanism installed on agricultural machinery according to this utility model;

[0022] Figure 5 This is a schematic diagram of the telescopic plate in the stepless limit switch connection mechanism installed on agricultural machinery according to this utility model;

[0023] Figure 6 This is a schematic diagram of the swing linkage in the stepless limit switch connection mechanism installed on agricultural machinery according to this utility model;

[0024] Figure 7 This is a schematic diagram of the adjusting linkage in the stepless limit switch connection mechanism installed on agricultural machinery according to this utility model;

[0025] Figure 8 This is a schematic diagram of the micro switch in the stepless limit switch connection mechanism installed on agricultural machinery according to this utility model;

[0026] Figure 9 This is a schematic diagram of another embodiment of the stepless limit switch connection mechanism of this utility model installed on agricultural machinery;

[0027] Figure 10 This is a schematic diagram of the arc-shaped adjusting plate in the stepless travel switch connection mechanism installed on agricultural machinery according to this utility model.

[0028] Reference numerals in the attached diagram: 1. Chain; 2. Tension spring; 3. Limit switch; 4. Protective cover; 5. Limit switch mounting plate; 6. Pull rod connecting bracket; 7. Power connection pull rod; 8. Pressure rod. 9. Adjusting link; 10. Swinging link; 11. Telescopic control plate; 12. Limit switch control plate; 13. Adjusting plate; 14. Connecting shaft; 15. Limit switch mounting bracket; 16. Arc-shaped adjusting plate; 17. Hinge bolt; 18. Torsion spring; 19. Adjusting fixing bolt; 20. Self-locking nut; 21. Front baffle; 22. Adjusting hole; 23. Adjusting bolt; 24. Hinge sleeve; 25. Arc-shaped groove; 26. Adjusting plate mounting hole; 27. Arc-shaped adjusting groove; 28. Adjusting plate bolt hole; 29. ​​Torsion spring mounting groove; 30. Limit switch control slide; 31. Telescopic control plate receiving groove; 32. Rear baffle; 33. Tension spring mounting hole; 34. Bolt post; 35. Stop part; 36. Push part; 37. Connecting hole; 38. Hinge sleeve I; 39. Connecting hole I; 40. Tension spring mounting hole I; 41. Hinge seat; 42. Micro limit switch. Detailed Implementation

[0029] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Example

[0030] like Figure 2-9The diagram shows the structure of the stepless limit switch connection mechanism installed on agricultural machinery according to this utility model. This utility model discloses a stepless limit switch connection mechanism installed on agricultural machinery, including a pull rod connecting frame 6, a power connection pull rod 7 hinged to the pull rod connecting frame 6, and a limit switch fixing frame 15 installed on the pull rod connecting frame 6. A limit switch 3 and a limit switch control plate 12 are installed on the top of the limit switch fixing frame 15, and a swing connecting rod 10 is hinged to the lower part of the limit switch fixing frame 15. The top of the swing connecting rod 10 is connected to a limit switch control plate 12. The telescopic control plate 11, which works in conjunction with the swing link 10, is fitted with an adjusting link 9 and a torsion spring 18 at the hinge of the limit switch fixing frame 15. One end of the torsion spring 18 is connected to the swing link 10, and the other end is connected to the adjusting link 9. The other end of the adjusting link 9 away from the swing link 10 is provided with a pressure rod 8 supported at the bottom of the power connection pull rod 7. A tension spring 2 is provided between the adjusting link 9 and the limit switch fixing frame 15. An adjusting bolt 23 for connecting the agricultural machinery seed box is provided at the bottom of the swing link 10 near the adjusting link 9.

[0031] The tie rod connecting frame 6 is hinged to the power connecting tie rod 7, which is connected to the power mechanism. A torsion spring 18 is installed between the hinged ends of the swing connecting rod 10 and the adjusting connecting rod 9. A position adjusting bolt 23 is installed between the two connecting surfaces of the swing connecting rod 10 and the adjusting connecting rod 9. The swing connecting rod 10 is connected to the arc-shaped adjusting plate 16. The position of the precision seeding machine is adjusted and controlled by adjusting the position of the adjusting bolt. The swing connecting rod 10 and the adjusting connecting rod 9 are simultaneously hinged to the lower part of the limit switch fixing frame 15. The top of the swing connecting rod 10 is hinged to the tail of the telescopic control plate 11. At the same time, the telescopic control plate 11 moves back and forth in the telescopic control plate receiving groove 31 on the upper part of the limit switch fixing frame 15. A pressure rod 8 is installed on the top of the adjusting connecting rod 9 and contacts the bottom of the power connecting tie rod 7. A tension spring 2 is provided on the limit switch fixing frame 15 of the adjusting connecting rod 9.

[0032] Upward movement: When the power connection rod 7 is rotated upward, the pressure rod 8 and the adjusting rod 9 move upward under the action of the tension spring 2. At this time, the swinging rod 10 is stationary until the adjusting rod 9 compresses the torsion spring to make the swinging rod 10 rigidly connected, driving the adjusting rod 9, the swinging rod 10 and the adjusting bolt 23 to rotate counterclockwise. The precision seeding box moves downward, causing the telescopic control plate 11 to disengage from the spring on the micro switch 42. The micro switch releases a signal, and the seeding function is activated. When the telescopic control plate 11 moves a very small distance, it reaches the front baffle 21. At this time, the micro switch 42 is in the stabilization period.

[0033] Downward movement: When the power connection lever 7 rotates downward, the power connection lever 7 drives the pressure lever 8 to rotate the adjusting rod 9 clockwise. Under the torque of the torsion spring 18, the adjusting rod 9 and the swing rod 10 are in a rigid state. The head of the swing rod 10 drives the telescopic control plate 11. The spring on the micro switch 42 of the telescopic control plate 11 contacts. When it moves to about 3mm, the micro switch 42 releases a signal. At this time, the sowing function is turned off. When the telescopic control plate 11 moves to a very small distance, it reaches the rear baffle 32. At this time, the micro switch is in a stable period.

[0034] This reciprocating motion drives the micro-switch assembly to work, achieving stable operation of the limit switch.

[0035] In this embodiment, the stepless limit switch assembly is fixed to the pull rod connection position on the fertilizer planter by the limit switch fixing bracket 15. Its adjusting rod 9 is in contact with the power connection pull rod 7 under the combined action of the tension spring 2 and the torsion spring 18. The angle between the adjusting rod 9 and the swing rod 10 is adjusted according to the working conditions of the fertilizer planter and locked with the adjusting bolt 23.

[0036] When the power connection lever 7 moves upward, it drives the adjusting link 9, the swing link 10, and the telescopic control plate 11. The spring pusher 36 on the telescopic control plate 11 drives the spring to rotate. When the spring reaches a certain position, the small button of the micro switch pops up. After moving a very small distance, the stop part 35 on the telescopic control plate 11 hits the front baffle 21 of the limit switch fixing bracket 15 and stops moving. When the power connection lever continues to move upward, the adjusting link 9 will also move. At this time, the swing link 10 is in a stationary state. The precision seeding box reaches the seeding position. The torsion spring between the adjusting link 9 and the swing link 10 begins to compress. At this time, the movement of the adjusting link 9 is a no-load movement. At this time, the micro switch is in a stable state without any fluctuation.

[0037] When the power connection lever 7 moves downward, it drives the adjusting link 9, the swing link 10, and then the telescopic control plate 11. The spring push part 36 on the telescopic control plate 11 drives the spring to rotate. When the spring reaches a certain position, the small button of the micro switch pops up. After moving a very small distance, the stop part 35 of the telescopic control plate 11 hits the back baffle 32 of the limit switch fixing bracket 15 and stops moving. At this time, the swing link 10 is in a stationary state, and the precision seeding box reaches the initial position. When the power connection lever 7 moves downward again, the adjusting link 9 will also move. At this time, the movement of the adjusting link 9 is a no-load movement. At this time, the micro switch is in a stable state without any fluctuation.

[0038] In a preferred embodiment, a bolt post 34 is provided on the lower side wall of the limit switch fixing bracket 15, and a hinge sleeve 24 fitted onto the bolt post 34 is provided on the side wall of the swing link 10. A hinge seat 41 is provided at the end 9 of the adjusting link. Through holes for the hinge sleeve 24 to pass through are provided on both sides of the hinge seat 41. A hinge bolt connected to the bolt post 34 is provided on the other side wall of the swing link 10 away from the hinge sleeve 41. The shaft hole of the adjusting link is fitted onto the pivot position of the swing link. A torsion spring and a washer are installed in the middle. The four parts are installed on the pivot position of the limit switch fixing bracket. Then, the telescopic control plate is inserted into the small rectangular hole on the front stop of the limit switch fixing bracket with screws. A washer is placed on the pivot position of the telescopic control plate and inserted into the upper hole of the swing link. Another washer is placed and locked with a nail. A micro switch assembly is installed at the top of the limit switch fixing bracket. Finally, a hexagonal head bolt with a cross groove is installed at the bottom of the swing link.

[0039] In a preferred embodiment, the top of the telescopic control plate 11 is provided with a connecting shaft 14, the top of the swing link 10 is provided with a connecting hole for accommodating the connecting shaft 14, and the end of the connecting shaft 14 is connected with a screw and a washer for fixing it to the swing link.

[0040] In a preferred embodiment, an adjustment plate 13 is provided on the side wall of the swing link 10, and adjustment holes 22 for accommodating adjustment bolts 23 are evenly distributed along the arc on the adjustment plate 13.

[0041] In a preferred embodiment, the limit switch mounting bracket 15 is provided with a tension spring adjusting plate, the tension spring adjusting plate is evenly distributed with tension spring mounting holes for attaching one end of the tension spring, and the adjusting connecting rod is provided with not less than 3 tension spring mounting holes I for attaching the other end of the tension spring.

[0042] In a preferred embodiment, a front baffle 21 and a rear baffle 32 are respectively provided on the limit switch mounting bracket 15 at the front and rear ends of the top of the swing linkage. The front baffle 21 is provided with a telescopic control plate receiving groove for accommodating the movement of the telescopic control plate.

[0043] In a preferred embodiment, a limit part is provided at the lower part of the control board near the end, and a drive part is provided at the upper part near the middle to abut against the limit switch control board.

[0044] In a preferred embodiment, the top of the limit switch mounting bracket is provided with a limit switch and a limit switch control board mounting base, and the side wall of the mounting base is provided with a limit switch control groove for accommodating the limit switch control board.

[0045] In a preferred embodiment, the limit switch is a micro limit switch. In this embodiment, two micro switches are designed and fixed on a switch base. The switch base has a control shaft connected to the limit switch control board. The control shaft is equipped with a spring and a torsion spring. The torque generated by the torsion spring causes the spring to rotate clockwise, so that the spring comes into contact with the micro switch, causing the small button of the micro switch to fall down, thus activating the micro switch. Example

[0046] like Figure 9-10 The diagram shown is a structural schematic of another embodiment of the stepless limit switch connection mechanism of this utility model installed on agricultural machinery;

[0047] The difference between this embodiment and embodiment one is that: the side wall of the swing linkage is provided with an arc-shaped groove and an adjustment plate mounting hole. An arc-shaped adjustment plate is connected to the adjustment plate mounting hole by a fixing bolt. The adjustment bolt is fixed to the end of the arc-shaped adjustment plate and extends through the arc-shaped groove to the adjustment linkage. The arc-shaped adjustment plate is provided with an arc-shaped adjustment groove for accommodating the fixing bolt.

[0048] In this embodiment, the arc-shaped adjusting plate is placed on the lower surface of the swing connecting rod. Screws are simultaneously inserted into the arc-shaped groove of the arc-shaped adjusting plate and the screw hole of the M6 ​​swing connecting rod, and nuts are installed. Then, M6 screws are simultaneously inserted into the screw hole of the M6 ​​arc-shaped adjusting plate and the arc-shaped groove of the swing connecting rod, and nuts are installed. During operation, the position of the seeds and fertilizer of the fertilizer and seeder is controlled by the position of the arc-shaped adjusting plate according to the working needs of the fertilizer and seeder. The position at which to start fertilizing and sowing, and at which to stop, is determined. After determining the position, the two nuts are tightened. Ideally, fertilizing and sowing should stop when the fertilizer and seeder leaves the ground surface, and should start working when the fertilizer and seeder reaches a certain depth below the ground surface.

[0049] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A stepless limit switch connection mechanism installed on agricultural machinery, comprising a pull rod connecting frame, a power connection pull rod hinged to the pull rod connecting frame, and a limit switch fixing frame installed on the pull rod connecting frame, wherein a limit switch and a limit switch control plate are provided on the top of the limit switch fixing frame, characterized in that: A swing link is hinged to the lower part of the limit switch mounting bracket. A telescopic control plate that works in conjunction with the limit switch is connected to the top of the swing link. An adjusting link and a torsion spring are fitted at the hinge point between the swing link and the limit switch mounting bracket. One end of the torsion spring is connected to the swing link, and the other end is connected to the adjusting link. A pressure rod that supports the bottom of the power connection rod is provided at the other end of the adjusting link away from the swing link. A tension spring is provided between the adjusting link and the limit switch mounting bracket. An adjusting bolt for connecting the agricultural machinery seed box is provided at the bottom of the swing link near the adjusting link.

2. The stepless limit switch connection mechanism installed on agricultural machinery as described in claim 1, characterized in that: A bolt post is provided on the lower side wall of the limit switch fixing bracket, and a hinge sleeve fitted on the bolt post is provided on the side wall of the swing link. A hinge seat is provided at the end of the adjusting link, and through holes for the hinge sleeve to pass through are provided on both sides of the hinge seat. A hinge bolt connected to the bolt post is provided on the other side wall of the swing link away from the hinge sleeve.

3. The stepless limit switch connection mechanism installed on agricultural machinery as described in claim 2, characterized in that: The telescopic control plate is provided with a connecting shaft at its top, and the swing linkage is provided with a connecting hole for accommodating the connecting shaft at its top. The end of the connecting shaft is connected with screws and washers for fixing it to the swing linkage.

4. The stepless limit switch connection mechanism installed on agricultural machinery as described in any one of claims 1 to 3, characterized in that: An adjustment plate is provided on the side wall of the swing linkage, and adjustment holes for accommodating adjustment bolts are evenly distributed along the arc of the adjustment plate.

5. The stepless limit switch connection mechanism installed on agricultural machinery as described in any one of claims 1 to 3, characterized in that: The side wall of the swing linkage is provided with an arc-shaped groove and an adjustment plate mounting hole. An arc-shaped adjustment plate is connected to the adjustment plate mounting hole by a fixing bolt. The adjustment bolt is fixed to the end of the arc-shaped adjustment plate and extends through the arc-shaped groove to the adjustment linkage. The arc-shaped adjustment plate is provided with an arc-shaped adjustment groove for accommodating the fixing bolt.

6. The stepless limit switch connection mechanism installed on agricultural machinery as described in claim 1, characterized in that: The limit switch mounting bracket is provided with a tension spring adjusting plate, and the tension spring adjusting plate is evenly distributed with tension spring mounting holes for attaching one end of the tension spring. The adjusting rod is provided with no less than 3 tension spring mounting holes I for attaching the other end of the tension spring.

7. The stepless limit switch connection mechanism installed on agricultural machinery as described in claim 1, characterized in that: The limit switch mounting bracket is provided with a front baffle and a rear baffle at the front and rear ends of the top of the swing linkage, respectively. The front baffle is provided with a telescopic control plate receiving groove for accommodating the movement of the telescopic control plate.

8. The stepless limit switch connection mechanism installed on agricultural machinery as described in claim 6, characterized in that: The control board has a limit part at the lower part near the end, and a drive part that abuts against the limit switch control board is provided at the upper part near the middle.

9. The stepless limit switch connection mechanism installed on agricultural machinery as described in claim 7, characterized in that: The top of the limit switch mounting bracket is provided with a limit switch and a limit switch control board mounting base, and the side wall of the mounting base is provided with a limit switch control groove to accommodate the limit switch control board.

10. The stepless limit switch connection mechanism installed on agricultural machinery as described in claim 1, characterized in that: The limit switch is configured as a micro limit switch.

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