Automatic raw coal stacking and taking equipment

Abstract

The utility model discloses automatic raw coal stacking and taking equipment, and relates to the field of raw coal stacking and taking. The device comprises a stockpiling bin, a fixing frame is arranged at the top of the stockpiling bin, a material tank is arranged on the lower side of the fixing frame and located in the stockpiling bin, a displacement assembly is arranged between the fixing frame and the material tank, a first material conveying pipe is arranged on one side of the upper portion of the material tank, and a second material conveying pipe is arranged at the bottom of the material tank. A material gathering assembly is arranged on the peripheral side of the second material conveying pipe, and material conveying assemblies are arranged in the first material conveying pipe and the second material conveying pipe. The second material conveying pipe at the bottom of the material tank is moved to raw coal in the stockpiling bin through the displacement assembly, the raw coal is conveyed into the material tank through the second material conveying pipe and then conveyed out through the first material conveying pipe for material taking, the raw coal can be conveyed into the stockpiling bin for stockpiling through reverse operation, and therefore the situation that the raw coal is automatically stockpiled and taken can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of raw coal stacking and taking, in particular to an automatic raw coal stacking and taking device. Background Art

[0002] Chinese utility model patent application number: CN202321775778.0, discloses a raw coal stacking control system. Its technical solution includes: a stacking bin, a partition and a fixed plate, the top surface of the stacking bin is welded with a top plate, and the inner wall of the top plate is installed with a fixed rod 2 and a motor 3, the output shaft of the motor 3 is welded with a screw rod 1, the fixed plate is slidably sleeved on the fixed rod 2, and the fixed plate is installed on the screw rod 1 through a thread, the inner wall of the fixed plate is installed with a fixed rod 1 and a motor 2, and the output shaft of the motor 2 is welded with a screw rod 2, a hydraulic rod is installed in the partition, and a tank body is provided on the hydraulic rod, the top surface of the inner wall of the tank body is installed with a motor 1, and a rotating shaft is welded on the output shaft of the motor 1, and a spiral blade is welded on the rotating shaft. This utility model meets the requirements of raw coal stacking, and stacking is more convenient to meet the needs of later use;

[0003] The above patent uses a motor to drive the rotating shaft to rotate forward or reverse so that the spiral blade can drive the raw coal spiral downward or upward, and discharge it through the feed pipe or inject it into the tank body for storage and loading and unloading. However, in the process of taking materials, the feed pipe moves downward to take materials from the raw coal in the stacking bin. After a certain period of time, the raw coal here will collapse. At this time, the position of the tank body must be frequently moved to carry out the material taking operation.

[0004] Therefore, we have made improvements to this and proposed an automatic raw coal stacking equipment. Utility Model Content

[0005] The purpose of the utility model is to take materials from the raw coal in the stockpile by moving the feed pipe downward during the material taking process. After a certain period of time, the raw coal here will collapse. At this time, the position of the tank body must be frequently moved to carry out the material taking operation.

[0006] In order to achieve the above-mentioned purpose of the invention, the present invention provides the following technical solutions:

[0007] The invention discloses an automatic raw coal stacking and taking device to improve the above problems.

[0008] The specific application is as follows:

[0009] It includes a material stacking bin, a fixed frame is installed on the top of the material stacking bin, a material tank is provided on the lower side of the fixed frame and inside the material stacking bin, a displacement assembly is provided between the fixed frame and the material tank, a first material delivery pipe is installed on one side of the upper part of the material tank, the first material delivery pipe extends to the interior of the material tank, a second material delivery pipe is installed at the bottom of the material tank, a material gathering assembly is provided on the circumference of the second material delivery pipe, a driving assembly is provided on the top of the material tank, a material delivery assembly is provided inside the first and second material delivery pipes, and the driving assembly cooperates with the material delivery assembly.

[0010] The second conveying pipe at the bottom of the material tank is moved to the raw coal in the stacking bin through the displacement component, and the second spiral blade is driven to rotate in the second conveying pipe by the driving component, and the first spiral blade is rotated in the first conveying pipe to convey the raw coal into the material tank through the second conveying pipe, and then conveyed out through the first conveying pipe for material retrieval. The opposite operation can convey the raw coal into the stacking bin, thereby achieving automatic stacking of raw coal. When the second conveying pipe is used to retrieve materials, the gathering racks on its surrounding sides are laid on the raw coal, and the conveyor belt is driven to rotate by the brushless motor and the driving rod, so that the gathering plate moves the raw coal to the center position of the second conveying pipe, reducing the need to frequently move the position of the tank body when retrieving materials, which affects the efficiency of retrieving materials.

[0011] As a preferred embodiment of the automatic raw coal stacking equipment provided by the present invention, a fixed block is installed on the circumferential side of the second conveying pipe, and adjustment grooves are provided on all four sides of the fixed block. The material gathering assembly includes a material gathering rack that rotatably fits between the inner walls on both sides of the adjustment groove, and an installation groove is provided on one side of the material gathering rack. First bevel gears are installed on both sides of the material gathering rack, and two adjacent first bevel gears are meshed with each other.

[0012] As a preferred embodiment of the automatic raw coal stacking equipment provided by the utility model, a first motor is installed on the top of the adjusting groove, the output shaft of the first motor is installed with a first threaded rod, the bottom end of the first threaded rod is installed with a limit block, the circumferential side thread of the first threaded rod is fitted with an adjusting block, and a sliding groove is provided at the bottom of one of the adjusting grooves, and the adjusting block is slidably fitted in the sliding groove.

[0013] As a preferred embodiment of the automatic raw coal stacking equipment provided by the utility model, a tooth plate is installed at the bottom of the adjusting block, and a spur gear is installed on one of the material collecting racks, and the spur gear is engaged with the tooth plate. Two driving rods are rotatably engaged between the inner walls on both sides of the mounting groove, and a brushless motor is provided in the middle of one of the driving rods. Conveyor belts are provided on the two driving rods, and a plurality of material collecting plates are installed on the outer circumference of the conveyor belt.

[0014] As a preferred embodiment of the automatic raw coal stacking equipment provided by the present invention, the driving assembly includes a second motor installed on the top of the material tank, the output shaft of the second motor is equipped with a first rotating rod, a protective frame is installed at the bottom of the top plate of the material tank, and a second rotating rod is rotatably engaged on one side plate of the protective frame. One end of the second rotating rod and the peripheral side of the first rotating rod are equipped with second bevel gears, and the two second bevel gears are meshed with each other.

[0015] As a preferred embodiment of the automatic raw coal stacking equipment provided by the present invention, the conveying assembly includes a first spiral blade installed on the circumferential side of the second rotating rod, the first spiral blade is located in the first conveying pipe, and a second spiral blade is installed on the circumferential side of the first rotating rod, and the second spiral blade is located in the second conveying pipe.

[0016] As a preferred embodiment of the automatic raw coal stacking equipment provided by the present invention, the displacement assembly includes a first displacement frame slidingly fitted on both sides of the inner wall of the fixed frame, and a second displacement frame slidingly fitted on both sides of the inner wall of the first displacement frame.

[0017] As a preferred embodiment of the automatic raw coal stacking equipment provided by the utility model, a third motor is installed on one side of the inner wall of the fixed frame, the output shaft of the third motor is installed with a second threaded rod, the second threaded rod is threadedly engaged with the first displacement frame, and a fourth motor is installed on one side of the inner wall of the first displacement frame, the output shaft of the fourth motor is installed with a third threaded rod, and the third threaded rod is threadedly engaged with the second displacement frame.

[0018] As a preferred embodiment of the automatic raw coal stacking equipment provided by the present invention, a hydraulic rod is installed in the middle of the second displacement frame, the bottom end of the telescopic shaft of the hydraulic rod is fixedly connected to the top of the second motor, and first limit rods are installed on both sides of the bottom of the second displacement frame, and second limit rods are installed on both sides of the top of the material tank, and the first limit rod and the second limit rod are slidably matched.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the second conveying pipe at the bottom of the material tank is moved to the raw coal in the stacking bin through the displacement component, the second spiral blade is driven to rotate in the second conveying pipe by the driving component, and the first spiral blade is rotated in the first conveying pipe, and the raw coal is conveyed into the material tank through the second conveying pipe, and then conveyed out through the first conveying pipe for material retrieval. The opposite operation can convey the raw coal into the stacking bin, thereby achieving the situation of automatic stacking of raw coal. When the second conveying pipe is used to retrieve materials, the gathering frame on its peripheral side is laid on the raw coal, and the conveyor belt is driven to rotate by the brushless motor and the driving rod, so that the gathering plate moves the raw coal to the center position of the second conveying pipe, reducing the need to frequently move the position of the tank body when retrieving materials, which affects the efficiency of retrieving materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the overall structure of the automatic raw coal stacking equipment provided in this application;

[0021] Figure 2 Schematic diagram of the material tank structure of the automatic raw coal stacking and unloading equipment provided for this application;

[0022] Figure 3 This is a schematic diagram of the structure of multiple material collection racks connected to the automatic raw coal stacking equipment provided in this application;

[0023] Figure 4 Schematic diagram of the structure of the material gathering component of the automatic raw coal stacking equipment provided in this application;

[0024] Figure 5 Schematic diagram of the drive assembly structure of the automatic raw coal stacking and unloading equipment provided in this application;

[0025] Figure 6 Schematic diagram of the displacement component structure of the automatic raw coal stacking equipment provided in this application.

[0026] Indicated in the figure:

[0027] 1. Stacking silo; 2. Fixed frame; 3. Material tank; 4. First feeding pipe; 5. Second feeding pipe; 6. Fixed block; 7. Adjusting slot; 8. Aggregating rack; 9. Mounting slot; 10. First bevel gear; 11. First motor; 12. First threaded rod; 13. Slide; 14. Adjusting block; 15. Limiting block; 17. Tooth plate; 18. Spur gear; 19. Driving rod; 20. Brushless motor; 21. Conveyor belt; 22. Aggregating plate; 23. Second motor; 24. First rotating rod; 25. Protective frame; 26. Second rotating rod; 27. Second bevel gear; 28. First spiral blade; 29. ​​Second spiral blade; 30. First displacement frame; 31. Second displacement frame; 32. Hydraulic rod; 33. Third motor; 34. Second threaded rod; 35. Fourth motor; 36. Third threaded rod; 37. First limiting rod; 38. Second limiting rod. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them.

[0029] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein can be combined with each other.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0032] In the description of this utility model, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is typically placed when in use, or the orientations or positional relationships commonly understood by those skilled in the art. Such terms are intended solely to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" and the like are used solely for distinction and description and should not be construed as indicating or implying relative importance.

[0033] As described in the background art, during the material taking process, the feed pipe moves downward to take material from the raw coal in the stockpile. After a certain period of time, the raw coal here will collapse. At this time, the position of the tank must be frequently moved to perform the material taking operation.

[0034] In order to solve this technical problem, the utility model provides an automatic raw coal stacking and taking device.

[0035] Specifically, please refer to Figure 1-6 The automatic stacking and unloading equipment for raw coal specifically includes: a stacking bin 1, a fixed frame 2 is installed on the top of the stacking bin 1, a material tank 3 is provided on the lower side of the fixed frame 2 and inside the stacking bin 1, a displacement component is provided between the fixed frame 2 and the material tank 3, a first material conveying pipe 4 is installed on one side of the upper part of the material tank 3, the first material conveying pipe 4 extends to the interior of the material tank 3, a second material conveying pipe 5 is installed at the bottom of the material tank 3, a material gathering component is provided on the surrounding side of the second material conveying pipe 5, a driving component is provided on the top of the material tank 3, a material conveying component is provided inside the first material conveying pipe 4 and the second material conveying pipe 5, and the driving component cooperates with the material conveying component.

[0036] The second conveying pipe 5 at the bottom of the material tank 3 is moved to the raw coal in the stacking bin 1 through the displacement component, and the second spiral blade 29 is driven by the driving component to rotate in the second conveying pipe 5, and the first spiral blade 28 is rotated in the first conveying pipe 4, so that the raw coal is transported to the material tank 3 through the second conveying pipe 5, and then transported out through the first conveying pipe 4 for material retrieval. The opposite operation can transport the raw coal into the stacking bin 1, so that the raw coal can be automatically stacked. When the second conveying pipe 5 is used to retrieve materials, the gathering frame 8 on its side is laid on the raw coal, and the conveyor belt 21 is driven to rotate by the brushless motor 20 and the driving rod 19, so that the gathering plate 22 moves the raw coal to the center position of the second conveying pipe 5, reducing the need to frequently move the position of the tank body when retrieving materials, which affects the efficiency of retrieving materials.

[0037] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein can be combined with each other.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0040] Example 1

[0041] Please refer to Figure 1-6, an automatic raw coal stacking and taking device, comprising: a stacking bin 1, a fixed frame 2 is installed on the top of the stacking bin 1, a material tank 3 is provided on the lower side of the fixed frame 2 and located inside the stacking bin 1, a displacement assembly is provided between the fixed frame 2 and the material tank 3, a first conveying pipe 4 is installed on one side of the upper part of the material tank 3, the first conveying pipe 4 extends into the interior of the material tank 3, a second conveying pipe 5 is installed at the bottom of the material tank 3, a material gathering assembly is provided on the circumference of the second conveying pipe 5, a driving assembly is provided on the top of the material tank 3, a material feeding assembly is provided inside the first conveying pipe 4 and the second conveying pipe 5, and the driving assembly cooperates with the material feeding assembly. A fixed block 6 is installed on the circumference of the second conveying pipe 5, and an adjustment groove 7 is provided on all four sides of the fixed block 6. The material gathering assembly includes a material gathering frame 8 that rotatably fits between the inner walls on both sides of the adjustment groove 7, a mounting groove 9 is provided on one side of the material gathering frame 8, and first bevel gears 10 are installed on both sides of the material gathering frame 8, and two adjacent first bevel gears 10 are meshed with each other. A first motor 11 is mounted on the top of the adjustment slot 7. A first threaded rod 12 is mounted on the output shaft of the first motor 11. A limit block 15 is mounted on the bottom end of the first threaded rod 12. An adjustment block 14 is threadedly engaged with the circumferential side of the first threaded rod 12. A slide groove 13 is provided at the bottom of one of the adjustment slots 7. The adjustment block 14 slides within the slide groove 13. A toothed plate 17 is mounted on the bottom of the adjustment block 14. A spur gear 18 is mounted on one of the material collecting racks 8. The spur gear 18 meshes with the toothed plate 17. Two drive rods 19 are rotatably engaged between the inner walls of both sides of the mounting slot 9. A brushless motor 20 is mounted in the middle of one of the drive rods 19. A conveyor belt 21 is sleeved on the two drive rods 19. A plurality of material collecting plates 22 are mounted on the outer circumference of the conveyor belt 21.

[0042] Implementation process: By turning on the first motor 11 to drive the first threaded rod 12 to rotate, the adjusting block 14 can be driven to slide up and down in the slide groove 13. The adjusting block 14 that slides up and down drives the tooth plate 17 to slide up and down. The tooth plate 17 is engaged with the spur gear 18 of one of the aggregate racks 8, thereby driving one of the aggregate racks 8 to rotate between the inner walls on both sides of the adjusting groove 7. The adjacent aggregate racks 8 are engaged with each other through the first bevel gear 10. The rotation of one aggregate rack 8 can drive multiple aggregate racks 8 to rotate synchronously, thereby adjusting the angles of multiple aggregate racks 8. During the material taking process of the second feeding pipe 5, multiple aggregate racks 8 can be brought into contact with the raw coal to gather the raw coal. When not in use, multiple aggregate racks 8 can be rotated upwards, and multiple teeth can be provided at the place where the two driving rods 19 are mounted on the conveyor belt 21 to engage with each other.

[0043] Implementation benefits: It is easy to adjust the positions of multiple gathering racks 8 so that the conveyor belts 21 and gathering plates 22 thereon are in contact with the raw coal to gather it.

[0044] Example 2

[0045] The drive assembly includes a second motor 23 mounted on the top of the tank 3. The output shaft of the second motor 23 is equipped with a first rotating rod 24. A protective frame 25 is mounted on the bottom of the top plate of the tank 3. A second rotating rod 26 is rotatably engaged with a side plate of the protective frame 25. Second bevel gears 27 are mounted on one end of the second rotating rod 26 and on the periphery of the first rotating rod 24, and the two second bevel gears 27 are meshed. The feed assembly includes a first spiral blade 28 mounted on the periphery of the second rotating rod 26 and located within the first feed pipe 4. A second spiral blade 29 is mounted on the periphery of the first rotating rod 24 and located within the second feed pipe 5. The displacement assembly includes a first displacement frame 30 that slides on both sides of the inner wall of the fixed frame 2. A second displacement frame 31 slides on both sides of the inner wall of the first displacement frame 30. A third motor 33 is mounted on one side of the inner wall of the fixed frame 2. The output shaft of the third motor 33 is mounted on a second threaded rod 34. The second threaded rod 34 is threadedly engaged with the first displacement frame 30. A fourth motor 35 is mounted on one side of the inner wall of the first displacement frame 30. The output shaft of the fourth motor 35 is mounted on a third threaded rod 36. The third threaded rod 36 is threadedly engaged with the second displacement frame 31. A hydraulic rod 32 is mounted in the middle of the second displacement frame 31. The bottom end of the telescopic shaft of the hydraulic rod 32 is fixedly connected to the top of the second motor 23. First limiting rods 37 are mounted on both sides of the bottom of the second displacement frame 31. Second limiting rods 38 are mounted on both sides of the top of the tank 3. The first limiting rod 37 and the second limiting rod 38 are slidably engaged.

[0046] Implementation process: The second motor 23 drives the first rotating rod 24 and the second spiral blade 29 to rotate in the second conveying pipe 5, and the two second bevel gears 27 are engaged to drive the second rotating rod 26 and the first spiral blade 28 to rotate in the first conveying pipe 4, and the raw coal is transported to the material tank 3 through the second conveying pipe 5, and then transported out through the first conveying pipe 4 for material collection. The opposite operation can be performed to transport the raw coal into the stacking bin 1.

[0047] Implementation benefits: The first spiral blade 28 provided in the first conveying pipe 4 can quickly convey the raw coal material in the material tank 3.

[0048] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the invention are included in the scope of the claims of the present invention.

Claims

1. A raw coal automatic stacking and taking device, characterized in that: include: A stacking bin (1) is provided with a fixed frame (2) on the top of the stacking bin (1), a material tank (3) is provided on the lower side of the fixed frame (2) and located inside the stacking bin (1), a displacement assembly is provided between the fixed frame (2) and the material tank (3), a first material delivery pipe (4) is provided on one side of the upper part of the material tank (3), the first material delivery pipe (4) extends into the interior of the material tank (3), a second material delivery pipe (5) is provided at the bottom of the material tank (3), a material gathering assembly is provided on the circumference of the second material delivery pipe (5), a driving assembly is provided on the top of the material tank (3), a material delivery assembly is provided inside the first material delivery pipe (4) and the second material delivery pipe (5), and the driving assembly cooperates with the material delivery assembly.

2. The automatic raw coal stacking and unloading equipment according to claim 1, characterized in that: A fixed block (6) is installed on the circumferential side of the second material conveying pipe (5), and adjustment grooves (7) are provided on all four sides of the fixed block (6). The material gathering assembly includes a material gathering frame (8) rotatably engaged between the inner walls on both sides of the adjustment groove (7), and a mounting groove (9) is provided on one side of the material gathering frame (8). First bevel gears (10) are installed on both sides of the material gathering frame (8), and two adjacent first bevel gears (10) are meshed with each other.

3. The automatic raw coal stacking and unloading equipment according to claim 2, characterized in that: A first motor (11) is installed at the top of the adjustment slot (7), an output shaft of the first motor (11) is installed with a first threaded rod (12), a limit block (15) is installed at the bottom end of the first threaded rod (12), and an adjustment block (14) is fitted with a circumferential thread of the first threaded rod (12), a sliding groove (13) is provided at the bottom of one of the adjustment slots (7), and the adjustment block (14) is slidably fitted in the sliding groove (13).

4. The automatic raw coal stacking and unloading equipment according to claim 3, characterized in that: A tooth plate (17) is installed at the bottom of the regulating block (14), a spur gear (18) is installed on one of the material collecting racks (8), and the spur gear (18) is meshed with the tooth plate (17). Two driving rods (19) are rotatably engaged between the inner walls of both sides of the mounting groove (9), a brushless motor (20) is provided in the middle of one of the driving rods (19), and a conveyor belt (21) is sleeved on the two driving rods (19), and a plurality of material collecting plates (22) are installed on the outer circumference of the conveyor belt (21).

5. The automatic raw coal stacking and unloading equipment according to claim 1, characterized in that: The driving assembly comprises a second motor (23) mounted on the top of the material tank (3); the output shaft of the second motor (23) is equipped with a first rotating rod (24); a protective frame (25) is mounted on the bottom of the top plate of the material tank (3); a second rotating rod (26) is rotatably engaged on a side plate of the protective frame (25); one end of the second rotating rod (26) and the peripheral side of the first rotating rod (24) are both equipped with second bevel gears (27), and the two second bevel gears (27) are meshed with each other.

6. The automatic raw coal stacking and unloading equipment according to claim 5, characterized in that: The feeding assembly includes a first spiral blade (28) installed on the circumference of the second rotating rod (26), the first spiral blade (28) is located in the first feeding pipe (4), and a second spiral blade (29) is installed on the circumference of the first rotating rod (24), the second spiral blade (29) is located in the second feeding pipe (5).

7. The automatic raw coal stacking and taking equipment according to claim 5, characterized in that: The displacement assembly comprises a first displacement frame (30) slidably fitted on both sides of the inner wall of the fixed frame (2), and second displacement frames (31) slidably fitted on both sides of the inner wall of the first displacement frame (30).

8. The automatic raw coal stacking and unloading equipment according to claim 7, characterized in that: A third motor (33) is mounted on one side of the inner wall of the fixed frame (2); an output shaft of the third motor (33) is mounted on a second threaded rod (34); the second threaded rod (34) is threadedly engaged with the first displacement frame (30); a fourth motor (35) is mounted on one side of the inner wall of the first displacement frame (30); an output shaft of the fourth motor (35) is mounted on a third threaded rod (36); the third threaded rod (36) is threadedly engaged with the second displacement frame (31).

9. The automatic raw coal stacking and taking equipment according to claim 7, characterized in that: A hydraulic rod (32) is installed in the middle of the second displacement frame (31), and the bottom end of the telescopic shaft of the hydraulic rod (32) is fixedly connected to the top of the second motor (23). First limiting rods (37) are installed on both sides of the bottom of the second displacement frame (31), and second limiting rods (38) are installed on both sides of the top of the material tank (3). The first limiting rod (37) and the second limiting rod (38) are slidably matched.

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