Double-track stepping type conveying mechanism

Abstract

The double-track stepping type conveying mechanism comprises a track beam and a double-track track, the double-track track is horizontally installed under the track beam, a walking gap is formed in the extending direction of the double-track track, a double-track pulley hook penetrates through the walking gap from bottom to top, and a walking wheel matched with the double-track track is installed at the top of the double-track pulley hook through a pulley yoke; a poke rod capable of directionally reciprocating in the horizontal direction is arranged in the track beam, a wedge-shaped poke block is connected to the bottom of the poke rod, when the poke rod directionally moves in the extending direction, the wedge-shaped poke block can poke the pulley yoke to directionally move in a stepping mode, and when the poke rod reversely moves, the wedge-shaped poke block can deflect and reversely move to cross the pulley yoke. According to the double-track stepping type conveying mechanism, the carcasses can be conveyed one by one in the pre-cooling room in a stepping mode, the distance between the different carcasses is ensured, the conveying work efficiency is high, the quality of the carcasses can be ensured, and cross contamination between the carcasses is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of carcass conveying, in particular to a double-track step-by-step conveying mechanism, which is used for directional conveying of double-track pulley hooks, namely carcasses, in a pre-cooling room. Background Art

[0002] In the pork processing, pre-cooling and acid removal is an important step, which can effectively improve the quality of pork and prevent nutrient loss. Among them, carcass acid removal has extremely strict requirements on temperature, humidity, space and time, and the carcass needs to be evenly hung on the double-track track in the pre-cooling room.

[0003] Traditional pre-cooling room tracks mostly use motor-driven chain conveying or manual pushing. Manual pushing is not only inefficient and labor-intensive, but also cannot ensure uniform distribution of carcasses; while motor-driven conveying has a complex structure, is not conducive to installation, and consumes a lot of energy. This equipment uses the reciprocating cycle of the cylinder to make the carcass move forward in a step-by-step manner. It has a high degree of automation, low energy consumption, and a simple structure that is easy to install. Summary of the invention

[0004] The embodiment of the present application provides a double-track step-by-step conveying mechanism, which can convey carcasses one by one in a pre-cooling room in a step-by-step manner, while ensuring the spacing between different carcasses, with high conveying efficiency, low energy consumption, and can ensure the quality of the carcasses.

[0005] An embodiment of the present application provides a double-track step-by-step conveying mechanism for directional conveying of a double-track pulley hook in a pre-cooling room, wherein the double-track pulley hook is specifically used for hooking carcasses, such as pig carcasses. The double-track stepping conveying mechanism comprises a track beam and a double-track track, the double-track track being horizontally installed directly below the track beam, the double-track track forming a walking gap along an extension direction, the double-track pulley hook penetrating the walking gap from bottom to top, and a walking wheel that cooperates with the double-track track and is rotatable is installed on the top through a pulley frame, a toggle rod that can directional reciprocate in a horizontal direction is arranged in the track beam, a wedge-shaped toggle block is evenly connected to the bottom of the toggle rod in an articulated manner, the articulation enables the wedge-shaped toggle block to have an activity space in the moving direction of the toggle rod, and the activity space is configured as follows: when the toggle rod is directionally moved along the extension direction, the wedge-shaped toggle block can toggle the pulley frame for directionally stepping movement, and when the toggle rod moves in the reverse direction, the wedge-shaped toggle block can deflect in the activity space and move in the reverse direction to pass over the pulley frame.

[0006] In a possible implementation, the top of the track beam is fixed to the on-site main steel beam through a secondary steel beam, at least one linear telescopic element is installed in the secondary steel beam, and the telescopic end of the linear telescopic element is connected to the toggle rod through an adapter plate.

[0007] In a possible implementation, the linear telescopic element is a cylinder, and there are 1-3 linear telescopic elements.

[0008] In a possible implementation, the track beam is composed of U-shaped steels that are horizontally symmetrically distributed, and the opening of the U-shaped steel is located on the inner side. A slider is provided in the moving space formed by the two U-shaped steels, and the slider is connected to the top of the toggle rod.

[0009] In a possible implementation, a U-shaped groove is provided at the bottom of the shifting rod, the wedge-shaped shifting block is hinged at the groove walls on both sides of the U-shaped groove, and the wedge-shaped shifting block has a limiting top. When the wedge-shaped shifting block shifts the pulley frame, the limiting top abuts against the groove bottom of the U-shaped groove, and the lower part of the wedge-shaped shifting block is inclined obliquely downward close to the pulley frame;

[0010] An arc-shaped transition structure is provided on one side of the limit top close to the pulley frame, and a hinge point between the wedge-shaped shift block and the shift rod is close to the arc-shaped transition structure, so that when the shift rod moves in the opposite direction, the wedge-shaped shift block can be deflected in a directional manner to move the limit top away from the bottom of the U-shaped groove.

[0011] In a possible implementation, a shifting plane structure is provided at a lower portion of a side of the wedge-shaped shifting block close to the pulley frame, so that when the wedge-shaped shifting block shifts the pulley frame, the shifting plane structure can abut against a surface of the pulley frame.

[0012] In a possible implementation, a groove is provided at the top of the double-track track corresponding to the wedge-shaped shift block, so that when the wedge-shaped shift block shifts the pulley frame into place, the traveling wheel can be exactly located in the groove.

[0013] In a possible implementation, the bottom of the toggle rod is evenly connected to a wedge-shaped block in the U-shaped groove in an articulated manner, and the wedge-shaped block has 1 to 4 blocks, which are correspondingly arranged at the rear side of 1 to 4 wedge-shaped blocks close to the tail end of the moving direction, and the wedge-shaped block cooperates with the wedge-shaped block to clamp and move the pulley frame;

[0014] The outer side of the wedge-shaped stopper is vertically connected to a limiting plate, and the limiting plate is flush with the end surface of the wedge-shaped stopper away from the clamping side. A limiting slide rail is arranged on the outer side of the track beam, and the limiting slide rail extends in a horizontal direction and is higher than the walking wheel, so that when the wedge-shaped shifting block shifts the pulley frame close to the groove, the limiting plate can be deflected and moved along the limiting slide rail and gradually move to the top of the limiting slide rail, and when the shifting rod moves in the opposite direction, the limiting plate can move along the limiting slide rail and drive the wedge-shaped stopper to reset.

[0015] In a possible implementation, the wedge-shaped shift block is composed of a metal shift block near the tail end in the moving direction and the remaining multiple nylon shift blocks, the bottom of the metal shift block is pointed, and the bottom of the nylon shift block is parallel to the limit top.

[0016] In a possible implementation, the limiting slide rail includes a main slide rail and an auxiliary slide rail, the main slide rail is opposite to the side of the limiting plate close to the wedge-shaped stop block, and the auxiliary slide rail is horizontally and vertically connected to one end of the main slide rail close to the wedge-shaped stop block and faces the limiting plate.

[0017] Beneficial effects: Compared with the prior art, the double-track step-by-step conveying mechanism provided by the present application drives the evenly distributed wedge-shaped shifting blocks to shift each double-track pulley hook to move on the double-track track through the shifting rod, and performs a return operation after the movement is in place, so that the wedge-shaped shifting blocks can shift the double-track pulley hooks that subsequently enter the pre-cooling room again, thereby realizing the step-by-step directional movement of the carcass in the pre-cooling room, the moving speed is controllable, the distance between the carcasses is controllable, and the conveying efficiency of the carcasses can be effectively improved, and the labor cost can be reduced;

[0018] Based on the special structure of the wedge-shaped shifting block, the limiting top abuts against the bottom of the U-shaped groove, thereby forming a limit for the wedge-shaped shifting block, so that the wedge-shaped shifting block can stably shift the double-track pulley hook to move. In addition, the arc-shaped transition structure enables the wedge-shaped shifting block to deflect and pass over the double-track pulley hook when encountering resistance in the reverse movement, so that the conveying mechanism can realize the step-by-step reciprocating continuous conveying of carcasses, and the operation is reliable;

[0019] Among them, 1-4 wedge-shaped blocks can effectively block the double-track pulley hook that is quickly transported from the entry switch to the pre-cooling room, ensuring that the carcasses in the pre-cooling room can move step by step.

[0020] These and other objects, features and advantages of the present invention will be fully reflected in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The schematic diagram of the structure of the double-track step-by-step conveying mechanism of the present application is shown.

[0022] Figure 2 A partial structural schematic diagram of the double-track stepping conveying mechanism of the present application is shown.

[0023] Figure 3 A partial rear view structural schematic diagram of the double-track stepping conveying mechanism of the present application during reverse movement is shown.

[0024] Figure 4 The schematic diagram of the structure of the nylon shifting block in the present application when shifting the double-track pulley hook is shown.

[0025] Figure 5A three-dimensional structural schematic diagram of the wedge-shaped stopper in the present application is shown. DETAILED DESCRIPTION

[0026] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0027] Those skilled in the art should understand that, in the disclosure of the specification, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0028] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0029] refer to Figures 1 to 5 The embodiment of the present application provides a double-track step-by-step conveying mechanism for directional conveying of a double-track pulley hook 10 in a pre-cooling room, wherein the pre-cooling room has a relative inbound side and an outbound side, and the carcasses hooked by the double-track pulley hook 10 are quickly conveyed to the pre-cooling room through the inbound turnout, and the carcasses in the pre-cooling room flow out to the outbound side.

[0030] The double-track step-by-step conveying mechanism includes a track beam 20 and a double-track track 30. The double-track track 30 is horizontally installed directly below the track beam 20. The double-track track 30 forms a walking gap 301 along the extension direction, wherein the double-track pulley hook 10 penetrates the walking gap 301 from bottom to top, and a walking wheel 12 that matches and can rotate with the double-track track 30 is installed on the top through the pulley frame 11, wherein the walking wheel 12 is located on both sides of the pulley frame 11, and is respectively opposite to each track of the double-track track 30, and matches with the wheel axle of the pulley frame through the bearing, so that the walking wheel can rotate freely and walk.

[0031] The track beam 20 is provided with a toggle rod 21 capable of directional reciprocating movement in the horizontal direction, and the bottom of the toggle rod 21 is evenly connected to a wedge-shaped toggle block 22 in an articulated manner, wherein the articulation allows the wedge-shaped toggle block 22 to have an activity space in the moving direction of the toggle rod 21, that is, this articulated relationship allows the wedge-shaped toggle block 22 to only be able to directional deflection, wherein the activity space is configured such that when the toggle rod 21 is directionally moved along the extension direction, the wedge-shaped toggle block 22 can toggle the pulley frame 11 directional step The double-track pulley hook 10 and the carcass can be moved in a directional step-by-step manner, and when the toggle rod 21 moves in the reverse direction, the wedge-shaped block 22 can deflect in the activity space and move in the reverse direction to pass over the double-track pulley hook 10. This deflection is an automatic behavior based on the resistance formed by the double-track pulley hook 10. Since the double-track pulley hook 10 is hooked with a carcass and has a large weight, the wedge-shaped block 22 can easily deflect when moving in the reverse direction. The specific structure of the wedge-shaped block 22 will be further described in detail later. In this way, the carcasses can be moved step by step one by one on the double-track track 30 in the pre-cooling room through the wedge-shaped blocks 22 evenly distributed and hingedly connected on the toggle rod 21. Not only the conveying speed is controllable, but also the distance between two adjacent carcasses is controllable, which can avoid or reduce the problem of cross contamination between adjacent carcasses, and the conveying is more stable and reliable, with high conveying efficiency, which can effectively reduce labor costs.

[0032] In one embodiment, the top of the track beam 20 is fixed to the on-site main steel beam through a secondary steel beam, and at least one linear telescopic element 23 is installed in the secondary steel beam, and the telescopic end of the linear telescopic element 23 is connected to the toggle rod 21 through an adapter plate 24, so as to drive the toggle rod 21 to move back and forth in a certain direction, wherein the linear telescopic element 23 is preferably a cylinder, and the reciprocating operation is more reliable, and the energy consumption is low, which can save costs. In addition, based on factors such as the length of the double-track stepping conveying mechanism and the weight of the carcass, the linear telescopic element 23 is preferably 1-3, wherein a single linear telescopic element 23 can drive the toggle rod 21 to move back and forth in a certain direction, wherein the coordinated work of multiple linear telescopic elements 23 can also provide a higher and more stable reciprocating driving force, and even if a certain linear telescopic element 23 fails, it still does not affect the movement of the toggle rod.

[0033] In one embodiment, the track beam 20 is composed of U-shaped steels 201 that are horizontally symmetrically distributed, and the opening of the U-shaped steel 201 is located on the inner side. A slider 25 is provided in a matching manner in the moving space formed by the two U-shaped steels 201, and the slider 25 is connected to the top of the toggle rod 21. In this way, the accuracy of the moving direction of the toggle rod 21 and the stability of the movement can be ensured through the cooperation of the slider 25 and the track beam 20, so that the movement of the carcass is more stable and orderly.

[0034] In one embodiment, a U-shaped groove 202 is provided at the bottom of the toggle rod 21. The wedge-shaped toggle block 22 is hinged at the groove walls on both sides of the U-shaped groove 202, and the wedge-shaped toggle block 22 has a limiting top 221. When the wedge-shaped toggle block 22 toggles the pulley frame 11, the limiting top 221 abuts against the groove bottom of the U-shaped groove 202, and the lower part of the wedge-shaped toggle block 22 is inclined obliquely downward close to the pulley frame 11, so that the wedge-shaped toggle block 22 can be limited by the cooperation of the limiting top 221 and the groove bottom, so as to prevent the wedge-shaped toggle block 22 from deflecting in the direction close to and away from the pulley frame 21 during the toggle process, so as to stably toggle the double-track pulley hook 10 to move;

[0035] An arc-shaped transition structure 222 is provided on the side of the limiting top 221 close to the pulley frame 11, and the hinge point between the wedge-shaped shift block 22 and the shift rod 21 is close to the arc-shaped transition structure 222, so that when the shift rod 21 moves in the opposite direction, the wedge-shaped shift block 22 can be deflected in a directional manner (towards the upper right) to make the limiting top 221 away from the bottom of the U-shaped groove 202, so that the wedge-shaped shift block 22 can pass over the pulley frame 11, thereby realizing the reciprocating step-by-step conveying of the double-track pulley hook by the wedge-shaped shift block 22.

[0036] Further preferably, a shifting plane structure 223 is provided at the lower part of one side of the wedge-shaped shift block 22 close to the pulley frame 11, so that when the wedge-shaped shift block 22 shifts the pulley frame 11, the shifting plane structure 223 can abut against the surface of the pulley frame 11, and the contact area is larger, which can further improve the stability and reliability of the wedge-shaped shift block 22 shifting the pulley frame 11.

[0037] It is worth mentioning that, considering that when the wedge-shaped shift block 22 shifts the carcass to move, the carcass swings left and right, if the carcass is to be controlled to stay in a predetermined position, it may be necessary to reduce the moving speed of the shift rod 21. Obviously, this will reduce the conveying efficiency of the carcass. Therefore, in one embodiment, a groove 302 (or a horizontal groove) is provided at the top of the double-track track 30 corresponding to the travel wheel at a predetermined position, so that when the wedge-shaped shift block 22 shifts the pulley frame 11 into place, the travel wheel 12 can be exactly located in the groove 302, so that during the forward conveying of the carcass, the groove 302 can form a certain degree of limitation for the double-track pulley hook 10, so that the carcass can stay accurately in the predetermined position, and at the same time, it does not affect the reciprocating movement of the shift rod 21 at a normal moving speed, and does not affect the conveying efficiency. Thereafter, the shift rod 21 moves in the opposite direction, and when it needs to continue to move, it only needs to remove the double-track pulley hook 10 from the groove 302 through the wedge-shaped shift block 22.

[0038] In addition, to ensure work efficiency, the carcass generally maintains a relatively fast moving speed on the entry switch, that is, it enters the double-track track 30 at a relatively fast initial speed, which means that the carcass has a relatively large moving inertia and yaw inertia when it just enters the double-track track 30. If no restriction is imposed, it will obviously affect the normal transportation of the carcass on the double-track track 30, such as collision. Therefore, the bottom of the toggle rod 21 is also hinged in the U-shaped groove 202 to ensure that the carcass is not moved normally. The wedge-shaped block 26 is evenly connected, wherein the wedge-shaped block 26 has 1-4 pieces and is correspondingly arranged on the rear side (i.e., the side away from the entry switch) of the wedge-shaped block 22 close to the tail end of the moving direction (i.e., close to the entry switch), and each wedge-shaped block 22 cooperates with a wedge-shaped block 26 to clamp and move the pulley frame 11, that is, the carcass just entering the entry switch is blocked by the wedge-shaped block 26. In addition, if only one wedge block is used Although the carcass movement speed can be directly reduced by blocking with a plurality of wedge-shaped blocks 26, the effect on the carcass sway inertia may be limited, and there is still the problem that the carcass sway inertia changes the carcass movement speed. Therefore, it is best to form a progressive block by using a plurality of wedge-shaped blocks 26 distributed at intervals to reduce the sway inertia of the carcass until it disappears. The number of wedge-shaped blocks 26 is mainly based on the difference between the entry speed of the carcass and the movement speed of the carcass on the double-track track 30. In addition, the wedge-shaped blocks The block 26 not only plays a role of blocking or progressive blocking, but also cooperates with the wedge-shaped shifting block 22 to convey one or more carcasses that have just entered the double-track track 30 in a clamping manner, which can further improve the conveying stability of these carcasses with large inertia (including moving inertia and yaw inertia), and at the same time force these carcasses to stabilize quickly. Among the carcasses blocked by 1-4 wedge-shaped blocks 26, the closer to the entry switch, the greater the moving inertia and yaw inertia of the carcasses;

[0039] The outer side of the wedge-shaped stopper 26 is vertically connected to a limiting plate 27, wherein the limiting plate 27 is flush with the end surface of the wedge-shaped stopper 26 away from the clamping side (the clamping side is the side where the wedge-shaped stopper 26 cooperates with the wedge-shaped shifting block 22 to clamp the pulley frame 11. At the same time, a limiting slide rail 28 is arranged on the outer side of the track beam 20, and the limiting slide rail 28 extends in the horizontal direction and is higher than the walking wheel, so that when the wedge-shaped shifting block 22 shifts the pulley frame 11 to approach the groove 302, the limiting plate 27 can deflect and move along the limiting slide rail 28 and gradually move to the top of the limiting slide rail 28, so that the double-track pulley hook 10 can smoothly reach the groove 302 position and stay. In addition, when the shifting rod 21 moves in the opposite direction, the limiting plate 27 can move along the limiting slide rail 28 and drive the wedge-shaped stopper 26 to reset, and during this period, it can easily cross the pulley frame 11 and the walking wheel 12.

[0040] Similarly, considering that the carcass transported from the entry turnout to the double-track track 30 has a large moving inertia and often collides with the wedge-shaped shifting block 22, the wedge-shaped shifting block 22 is composed of a metal shifting block 2201 near the tail end of the moving direction and the remaining multiple nylon shifting blocks 2202, wherein there are generally a plurality of nylon shifting blocks 2202, wherein the bottom of the metal shifting block 2201 is pointed, so that the carcass transported from the entry turnout can be directly hit by the good structural characteristics of the metal material (higher strength and more durability). The pulley frame 11 and the metal shift block 2201 have a long service life, and the pointed tip at the bottom has a smaller blocking area, which can ensure that the double-track pulley hook 10 moves faster. The bottom of the nylon shift block 2202 is parallel to the limiting top 221, so that the entire bottom of the nylon shift block 2202 has good structural strength, which can more smoothly shift the double-track pulley hook 10 to move. In addition, nylon is light in weight and not easy to damage the double-track pulley hook 10. It is also low in cost and produces very little noise when colliding with the pulley frame 11 during use.

[0041] In one embodiment, the limiting slide rail 28 includes a main slide rail 281 and an auxiliary slide rail 282, wherein the main slide rail 281 is opposite to the side of the limiting plate 27 close to the wedge-shaped block 26, and the auxiliary slide rail 282 is horizontally and vertically connected to one end of the main slide rail 281 close to the wedge-shaped block 26, and is opposite to the limiting plate 27. Therefore, when the limiting plate 27 contacts the limiting slide rail 28, a larger contact area can be provided by the auxiliary slide rail 282, which can ensure that the limiting plate 27 drives the wedge-shaped block 26 to stably deflect and move to the top of the main slide rail 281, and has high reliability.

[0042] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. Double-track step-by-step conveying mechanism, used for directional conveying of double-track pulley hooks in the pre-cooling room, characterized in that: The invention comprises a track beam and a double-track track, the double-track track being horizontally installed directly below the track beam, the double-track track forming a walking gap along an extension direction, the double-track pulley hook penetrating the walking gap from bottom to top, and a walking wheel which cooperates with the double-track track and is rotatable is installed at the top through a pulley frame, a toggle rod which can move back and forth in a horizontal direction is arranged in the track beam, a wedge-shaped toggle block is evenly connected to the bottom of the toggle rod in an articulated manner, the articulation makes the wedge-shaped toggle block have an activity space in the moving direction of the toggle rod, and the activity space is configured as follows: when the toggle rod moves in a direction along the extension direction, the wedge-shaped toggle block can toggle the pulley frame for directional step-by-step movement, and when the toggle rod moves in the reverse direction, the wedge-shaped toggle block can deflect in the activity space and move in the reverse direction to pass over the pulley frame.

2. The double-track step-by-step conveying mechanism according to claim 1, characterized in that: The top of the track beam is fixed to the on-site main steel beam through a secondary steel beam, and at least one linear telescopic element is installed in the secondary steel beam. The telescopic end of the linear telescopic element is connected to the toggle rod through an adapter plate.

3. The double-track step-by-step conveying mechanism according to claim 2, characterized in that: The linear telescopic element is a cylinder, and the number of the linear telescopic element is 1-3.

4. The double-track step-by-step conveying mechanism according to claim 1, characterized in that: The track beam is composed of U-shaped steels that are horizontally symmetrically distributed, and the openings of the U-shaped steels are located on the inner side. A slider is arranged in the moving space formed by two U-shaped steels, and the slider is connected to the top of the toggle rod.

5. The double-track step-by-step conveying mechanism according to claim 1, characterized in that: A U-shaped groove is provided at the bottom of the shifting rod, the wedge-shaped shifting block is hinged at the groove walls on both sides of the U-shaped groove, and the wedge-shaped shifting block has a limiting top. When the wedge-shaped shifting block shifts the pulley frame, the limiting top abuts against the groove bottom of the U-shaped groove, and the lower part of the wedge-shaped shifting block is inclined obliquely downward close to the pulley frame; An arc-shaped transition structure is provided on one side of the limit top close to the pulley frame, and a hinge point between the wedge-shaped shift block and the shift rod is close to the arc-shaped transition structure, so that when the shift rod moves in the opposite direction, the wedge-shaped shift block can be deflected in a directional manner to move the limit top away from the bottom of the U-shaped groove.

6. The double-track step-by-step conveying mechanism according to claim 5, characterized in that: A shifting plane structure is provided at the lower part of one side of the wedge-shaped shifting block close to the pulley frame, so that when the wedge-shaped shifting block shifts the pulley frame, the shifting plane structure can abut against the surface of the pulley frame.

7. The double-track step-by-step conveying mechanism according to claim 5, characterized in that: A groove is provided at the top of the double-track track corresponding to the wedge-shaped shifting block, so that when the wedge-shaped shifting block shifts the pulley frame into place, the traveling wheel can be exactly located in the groove.

8. The double-track step-by-step conveying mechanism according to claim 7, characterized in that: The bottom of the toggle rod is evenly connected with a wedge-shaped block in the U-shaped groove in an articulated manner. There are 1 to 4 wedge-shaped blocks, which are correspondingly arranged at the rear side of 1 to 4 wedge-shaped blocks close to the tail end of the moving direction. The wedge-shaped block cooperates with the wedge-shaped blocks to clamp and move the pulley frame; The outer side of the wedge-shaped stopper is vertically connected to a limiting plate, and the limiting plate is flush with the end surface of the wedge-shaped stopper away from the clamping side. A limiting slide rail is arranged on the outer side of the track beam, and the limiting slide rail extends in a horizontal direction and is higher than the walking wheel, so that when the wedge-shaped shifting block shifts the pulley frame close to the groove, the limiting plate can be deflected and moved along the limiting slide rail and gradually move to the top of the limiting slide rail, and when the shifting rod moves in the opposite direction, the limiting plate can move along the limiting slide rail and drive the wedge-shaped stopper to reset.

9. The double-track step-by-step conveying mechanism according to claim 8, characterized in that: The wedge-shaped shifting block is composed of a metal shifting block near the tail end in the moving direction and the remaining multiple nylon shifting blocks. The bottom of the metal shifting block is pointed, and the bottom of the nylon shifting block is parallel to the limit top.

10. The double-track step-by-step conveying mechanism according to claim 8, characterized in that: The limiting slide rail includes a main slide rail and an auxiliary slide rail. The main slide rail faces the side of the limiting plate close to the wedge-shaped stopper. The auxiliary slide rail is horizontally and vertically connected to one end of the main slide rail close to the wedge-shaped stopper and faces the limiting plate.

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