Uniform mixing and uniform distribution control device for spreading coiled material particles

Abstract

The invention relates to the technical field of particle control equipment, and discloses a uniform mixing and uniform distribution control device for coiled material particle spreading, which comprises a material box for feeding particle materials; a base; the regulation and control mechanism is used for regulating and controlling the particle materials in the material box; and the regulation and control mechanism comprises a uniform control device, a width control device and a material control device. According to the uniform mixing and uniform distribution control device for spreading the coiled material particles, the uniform distribution roller composed of the two half rollers (the first half roller and the second half roller) rotating oppositely is arranged, particle materials are automatically distributed in the left direction and the right direction to be thrown in the falling process, the distribution uniformity of the particle materials on the surface of a coiled material is effectively improved, and the uniformity of the particle materials is improved. And threaded sleeves in the width control device are matched with opening limiting frames, and the two threaded sleeves adopt opposite thread screwing directions, so that the two opening limiting frames can move relatively, the width of the discharging opening is adjusted, and the requirements of coiled materials with different widths or different sowing densities are met.

Description

Technical Field

[0001] This invention relates to the field of particle control equipment technology, specifically to a mixing and uniform distribution control device for spreading particles in rolled materials. Background Technology

[0002] A spreader is used to spread granular, powdery, and other materials. A movable agitator is attached to the top of the spreader to ensure even distribution of the material within the hopper. A distributing vibrating roller is attached to the bottom of the hopper to prevent material clumping and ensure uniform feeding; this roller is typically driven by a servo motor.

[0003] However, in the current processing and production of some leathers, certain special leathers require the application of specific granules. This necessitates a spreader to evenly distribute the granules onto the leather surface. However, current spreaders suffer from several drawbacks: firstly, uniformity cannot be guaranteed; secondly, the spreading width cannot be adapted during the spreading process; and thirdly, the spreading method cannot be adjusted as needed, resulting in overly simplistic spreading control. Therefore, a mixing and uniform distribution control device for spreading granules on roll materials is proposed to address these issues. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a mixing and uniform distribution control device for spreading granules in rolled materials, which solves the problem that the spreading method of the spreader in the prior art is too singular and the spreading uniformity is poor.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a mixing and uniform distribution control device for spreading granular materials in rolls, comprising a material bin for dispensing granular materials; a base; and a control mechanism for controlling the granular materials in the material bin; the control mechanism includes a uniform control device, a width control device, and a material control device.

[0006] The equalization control device includes a servo motor. The output end of the servo motor is connected to the power shaft via a transmission component. The power shaft is rotatably connected to the material box. A roller is mounted on the power shaft. A equalization roller is arranged below the roller. A first gear and a third gear are connected to the power shaft. A second gear and a fourth gear are respectively meshed on the first gear and the third gear. A large gear is meshed on the surface of the fourth gear.

[0007] Preferably, the equalizing roller includes a first half-roller and a second half-roller, with a central shaft rotatably connected at the axis of the first half-roller and the second half-roller, the second gear being connected to the first half-roller, and the large gear being connected to the first half-roller.

[0008] Preferably, the width control device includes a limiting frame, a collection box is connected to the side of the limiting frame, a support plate is connected to the collection box, a threaded sleeve is threadedly connected to the support plate, and the threaded sleeve is connected to the central shaft.

[0009] Preferably, there are two limiting brackets and threaded sleeves, and the two limiting brackets are slidably connected to each other, and the threads of the two threaded sleeves are opposite in direction.

[0010] Preferably, the material control device includes a movable plate, a lever connected to the side of the movable plate, the lever being slidably connected in a groove in the material box, a cam abutting the surface of the lever, the cam being connected to a power shaft, an opening groove being provided on the movable plate, an inclined plate being slidably connected to the right side of the movable plate, the inclined plate being installed inside the base, and the third gear engaging with the cam.

[0011] Preferably, the third gear and the cam are both connected to keyways on their opposing surfaces. The rotation of the third gear causes the keyways on its surface to abut against the keyways on the cam, thereby causing the cam to rotate synchronously.

[0012] Preferably, the cam is provided with an adjustment device, the adjustment device including a round sleeve connected to the cam, the round sleeve having a slot, a pull rod connected inside the slot, a threaded sleeve connected to the bottom of the pull rod, and a small screw threadedly connected inside the threaded sleeve, the small screw being rotatably connected to the surface of the threaded sleeve.

[0013] Preferably, the control shaft is provided with a connecting key, and the threaded sleeve and the small screw are respectively provided with a key and a sliding key inside, and a rotating wheel is connected to the end face of the control shaft.

[0014] Preferably, a limiting block is connected to the side of the material box, and the pull rod is slidably connected in the inner groove of the limiting block.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a mixing and uniform distribution control device for spreading rolled material granules, which has the following beneficial effects: 1. The mixing and uniform distribution control device for spreading granules on roll materials, by setting up a distribution roller consisting of two relatively rotating half rollers (half roller one and half roller two), automatically divides the granules into left and right directions during the falling process, effectively improving the uniformity of the distribution of granules on the surface of the roll material.

[0016] 2. The uniform distribution control device for spreading roll material granules uses the cooperation of the threaded sleeve and the limiting frame in the width control device. The two threaded sleeves adopt opposite thread directions, so that the two limiting frames can move relative to each other, thereby adjusting the width of the discharge port to meet the needs of roll materials of different widths or different spreading densities.

[0017] 3. This mixing and distribution control device for spreading granules in rolled materials can switch between two modes: "intermittent feeding" and "continuous feeding" through the cooperation of the movable plate, open slot, and cam in the material control device. In intermittent mode, the granular material is distributed in a "dense-sparse-dense-sparse" cycle; in continuous mode, the granular material falls evenly and continuously to meet different process requirements.

[0018] 4. This device for uniformly distributing and controlling the spread of rolled material granules integrates uniform control, width control, and material control. It achieves power distribution through a servo motor and gear transmission, and manual adjustment through a rotating wheel and control shaft. It has a compact structure, is easy to operate, and is suitable for actual production environments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall front structure of a mixing and uniform distribution control device for spreading rolled material particles proposed in this invention. Figure 2 This is a schematic diagram of the overall back structure of a mixing and uniform distribution control device for spreading rolled material particles proposed in this invention. Figure 3 This is a schematic diagram of the uniform distribution control device of a mixing and distribution control device for spreading rolled material particles proposed in this invention. Figure 4 This is a schematic diagram of the connection structure of the distribution roller of a mixing and uniform distribution control device for spreading rolled material particles according to the present invention. Figure 5 This is a schematic diagram of the width control device structure of a mixing and uniform distribution control device for spreading rolled material particles proposed in this invention. Figure 6 This is a schematic diagram of the material control device structure of a mixing and uniform distribution control device for spreading rolled material granules proposed in this invention. Figure 7 This is a schematic diagram of the key position structure of a mixing and uniform distribution control device for spreading rolled material particles proposed in this invention. Figure 8 This is a schematic diagram of the connection structure of the control shaft of a mixing and uniform distribution control device for spreading rolled material particles proposed in this invention.

[0020] In the diagram: 1. Material bin; 2. Base; 3. Control mechanism; 301. Power shaft; 302. Roller; 303. Inclined blade; 304. Distributing roller; 305. First gear; 306. Second gear; 307. Half roller one; 308. Third gear; 309. Fourth gear; 310. Large gear; 311. Half roller two; 312. Central shaft; 313. Rotary wheel; 314. Threaded sleeve; 315. Support plate; 316. Collection box; 317. Limiting frame; 318. Movable piece; 319. Opening slot; 320. Lever; 321. Cam; 322. Locking key; 323. Circular sleeve; 324. Limiting block; 325. Pull rod; 326. Screw sleeve; 327. Small screw; 328. Control shaft; 329. Insert key; 330. Sliding key. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-8 A mixing and uniform distribution control device for spreading granules in rolled materials includes a material bin 1 for dispensing granular materials; a base 2; and a control mechanism 3 for controlling the granular materials in the material bin 1. The control mechanism 3 includes a uniform control device, a width control device, and a material control device. The uniform control device includes a servo motor, the output of which is connected to a power shaft 301 via a transmission component. The power shaft 301 is rotatably connected to the material box 1. A roller 302 is mounted on the power shaft 301, and a distributing roller 304 is positioned below the roller 302. A first gear 305 and a third gear 308 are connected to the power shaft 301. A second gear 306 and a fourth gear 309 are meshed on the first gear 305 and the third gear 308, respectively. A large gear 310 meshes on the surface of the fourth gear 309. Below the roller 302, the distributing roller 304 is used to distribute the falling particles evenly. To achieve bidirectional relative rotation of the distributing roller 304, the first gear 305 and the third gear 308 are coaxially mounted on the power shaft 301. The first gear 305 and its meshing second gear 306 form the first-stage transmission pair, directly driving one side of the distribution roller 304. The third gear 308 meshes with the fourth gear 309, which in turn meshes with a larger diameter gear 310, forming the second-stage reduction and reversing transmission chain. Through this gear system, the power input from the single shaft of the servo motor is decomposed into two outputs with opposite rotational directions, driving the two parts of the distribution roller 304 to rotate relative to each other, thereby symmetrically scattering the falling granular material on the roller surface and achieving uniform distribution from left to right.

[0023] In this embodiment, the equalizing roller 304 includes a first half-roller 307 and a second half-roller 311. A central shaft 312 is rotatably connected to the axis of the first half-roller 307 and the second half-roller 311. A second gear 306 is connected to the first half-roller 307, and a large gear 310 is connected to the first half-roller 307. The equalizing roller 304 consists of two relatively independent and structurally symmetrical half-rollers, namely the first half-roller 307 and the second half-roller 311. The two are coaxially rotatably connected at their axis through the central shaft 312. The two ends of the central shaft 312 are fixed to the support structure on the side wall of the material box 1, providing a stable rotation center for the half-rollers. The outer surfaces of the first half-roller 307 and the second half-roller 311 may be provided with evenly distributed material-guiding plates or grooves, which are used to guide and diffuse the falling particles during rotation, further improving the uniformity of distribution.

[0024] Furthermore, in terms of power transmission, the second gear 306 is connected to the end of half-roller 307 via a key connection or flange fixation, receiving power input from the first gear 305 and driving half-roller 307 to rotate in the first direction. The large gear 310 is fixed to the corresponding end of half-roller 311, obtaining power through meshing with the fourth gear 309. Due to the design of the gear transmission chain, the rotation direction of half-roller 311 is opposite to that of half-roller 307. In this way, the two half-rollers achieve relative rotational motion on the central shaft 312. When the granular material falls into the gap between the two rollers, it is spread in both directions, effectively avoiding the problem of one-sided accumulation or uneven distribution, and significantly improving the symmetry and uniformity of spreading.

[0025] Furthermore, the width control device includes a limiting frame 317, with a collection box 316 connected to the side of the limiting frame 317. A support plate 315 is connected to the collection box 316, and a threaded sleeve 314 is threadedly connected to the support plate 315. The threaded sleeve 314 is connected to the central shaft 312. Two limiting frames 317 and threaded sleeves 314 are provided, with the two limiting frames 317 slidably connected to each other, and the threads of the two threaded sleeves 314 having opposite directions. The support plate 315 is fixedly connected to the outside of the collection box 316, and the support plate 315 has threaded holes machined on it, forming a threaded fit with the threaded sleeves 314. The threaded sleeves 314 are rotatably connected to the central shaft 312 via bearings or bushings and can rotate around it. Specifically, the width control device has two limiting frames 317 and corresponding threaded sleeves 314. The two limiting frames 317 are slidably connected to each other via a slide rail and slide groove structure, ensuring that they can move relatively close or far apart during adjustment, and that the movement is smooth and without jamming. Two threaded sleeves 314 rotate synchronously. Due to their opposite rotation directions, they drive the two threaded support plates 315 to move towards or in opposite directions, thereby pulling the two limiting frames 317 to open and close symmetrically along the central axis. Through this structure, the effective width of the material drop opening can be precisely and continuously adjusted to meet the production needs of roll materials of different widths, while maintaining the uniform distribution of particles in the width direction.

[0026] In addition, the material control device includes a movable plate 318, with a lever 320 connected to its side. The lever 320 is slidably connected in a groove in the material box 1. A cam 321 abuts against the surface of the lever 320, and the cam 321 is connected to the power shaft 301. An opening slot 319 is provided on the movable plate 318, and an inclined plate 303 is slidably connected to the right side of the movable plate 318. The inclined plate 303 is installed inside the base 2, and a third gear 308 engages with the cam 321. An opening slot 319 is provided in the middle of the movable plate 318, and the shape of the slot corresponds to the material drop area above the inclined plate 303. When the movable plate 318 is at different heights, the relative position of the opening slot 319 and the inclined plate 303 changes, thereby controlling whether the granular material can pass through and the amount that passes through. The right edge of the movable plate 318 and the side of the inclined plate 303 are slidably connected by a groove or guide rail structure to ensure that the movement of the movable plate 318 does not affect the fixed position of the inclined plate 303. The inclined blade 303 is fixedly installed inside the base 2, serving as a guide to ensure the smooth flow of granular material to the distributing roller 304. In terms of transmission control, the end faces of the third gear 308 and the cam 321 are detachably engaged via a key 322 structure. When the key is engaged, the rotation of the third gear 308 drives the cam 321 to rotate synchronously, thereby driving the movable blade 318 to reciprocate up and down, achieving intermittent material spreading. When the key 322 disengages, the cam 321 stops rotating, and the movable blade 318 falls to a fixed position under gravity, with the opening slot 319 aligned with the inclined blade 303, achieving continuous material spreading. Keys 322 are connected to the opposing surfaces of the third gear 308 and the cam 321. The rotation of the third gear 308 causes the key 322 on its surface to abut against the key 322 on the cam 321, thereby driving the cam 321 to rotate synchronously.

[0027] In addition, the cam 321 is equipped with an adjustment device, which includes a sleeve 323 connected to the cam 321. The sleeve 323 has a slot, inside which a pull rod 325 is connected. A threaded sleeve 326 is connected to the bottom of the pull rod 325. A small screw 327 is threadedly connected to the inside of the threaded sleeve 326, and the small screw 327 is rotatably connected to the surface of the threaded sleeve 314. When switching the feeding mode, the operator can drive the threaded sleeve 314 to rotate via the rotary wheel 313 and control shaft 328, thereby causing the small screw 327 to rotate. Because the threaded sleeve 326 and the small screw 327 are threadedly engaged, and their axial movement is constrained by the pull rod 325 and the slot of the sleeve 323, the rotation of the small screw 327 will drive the threaded sleeve 326 to move laterally along the axis, thereby pulling the pull rod 325 and the connected sleeve 323 and cam 321 to slide axially along the power shaft 301. This axial displacement allows the locking key 322 on the end face of the cam 321 to disengage from the locking key 322 on the third gear 308, thereby cutting off the power input to the cam 321 and realizing the mode switching from "intermittent feeding" to "continuous feeding".

[0028] It is worth noting that a connecting key is provided on the control shaft 328, and a key 329 and a sliding key 330 are respectively opened inside the threaded sleeve 314 and the small screw 327. A rotating wheel 313 is connected to the end face of the control shaft 328. A limit block 324 is connected to the side of the material box 1, and the pull rod 325 is slidably connected in the internal groove of the limit block 324. A keyway 329 is opened at a corresponding position inside the threaded sleeve 314, and a sliding keyway 330 is provided axially inside the small screw 327. When the control shaft 328 is pushed or pulled axially, the connecting key on it can selectively engage with the keyway 329 or the sliding keyway 330, thereby realizing the transmission switching of different functions. To ensure the stability and guiding accuracy of the pull rod 325 during lateral movement, a limit block 324 is fixedly provided on the side of the material box 1. A horizontal sliding groove is machined inside the limit block 324, and the pull rod 325 passes through the sliding groove and forms a sliding engagement with it. This structure not only restricts the pull rod 325 to move horizontally only in the set direction, preventing it from wobbling or jamming during adjustment, but also provides partial support, ensuring that the cam 321 and related adjustment devices maintain reliable alignment and smooth movement during frequent operation.

[0029] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that provides control.

[0030] The working principle is as follows: First, the servo motor is controlled to rotate, and the servo motor synchronously controls the rotation of the power shaft 301 through the transmission components. The particles inside the material bin 1 will rotate with the rotation of the roller 302 driven by the power shaft 301, slowly flowing downwards from the side opening, and then falling onto the inclined plate 303. They then flow upwards along the inclined plate 303 towards the distribution roller 304. Under the rotation of the power shaft 301, the first gear 305 and the third gear 308 will rotate synchronously. The rotation of the first gear 305 will then interact with the second gear 308... The meshing of gear 6 drives half-roller 307 to rotate counterclockwise, while the rotation of the third gear 308 will drive the large gear 310 to rotate clockwise through the fourth gear 309 in the middle. Finally, half-roller 311 will rotate clockwise. Therefore, half-roller 307 and half-roller 311 will rotate relative to each other. The granular material falling above them will be divided into two directions and evenly sprinkled onto the roll material below. By using two relatively moving half-rollers, the material can be automatically sprinkled in half during the falling process, thereby improving the uniformity of the granular material. The simultaneously installed width control device can limit the width of material spreading. At this time, the operator needs to control the rotation of the rotary wheel 313. The rotary wheel 313 will drive the internal control shaft 328 to rotate. Using the engagement of the connecting key and the insertion key 329, the threaded sleeve 314 will rotate synchronously. There are two threaded sleeves 314, and the other side operates on the same principle. The two threaded sleeves 314 will rotate synchronously. At this time, the support plate 315, which is threadedly connected to the two threaded sleeves 314, will move laterally, thereby causing the collection box 316 and the limiting frame 317 to move laterally. Because the threads of the two threaded sleeves 314 have opposite directions, the two... The two limiting frames 317 will move relative to each other, thereby narrowing the opening formed by the two limiting frames 317. At this time, the granular material above will only fall from the opening formed in the middle, while the granular material on the sides will enter the collection box 316 for collection. It can then be conveyed back to the material box 1 by the conveyor. The reason for collection is that if it is not collected, the granular material on the sides will concentrate and fall inward. The density of the granular material in the middle position remains unchanged, but when the granular material on both sides concentrates inward, the density of the granular material on both sides of the roll will increase, resulting in uneven distribution of the granular material. A material control device is also installed on the entire device.The material control device mainly controls the way granular material is sprinkled. When the third gear 308 rotates, it will synchronously drive the side key 322 to rotate. At this time, the key 322 on the cam 321 and the key 322 on the third gear 308 are in abutting state, so the cam 321 will rotate synchronously. When the cam 321 rotates, it will use the abutment of the protrusion position with the lever 320 to drive it to slide up and down. Then it will drive the movable plate 318 to slide up and down synchronously. The up and down sliding of the movable plate 318 will control the position change of the opening slot 319. So when the granular material falls onto the inclined plate 303, it will be blocked by the movable plate 318. When the opening slot 319 is flush with the inclined plate 303, the granular material will flow from the position of the opening slot 319 to the top of the equalizing roller 304. So at this time, the granular material forms a certain degree of intermittent feeding method, which is finally reflected on the roll material. This creates a dense-sparse-dense-sparse cycle, thus changing the overall distribution pattern of the granular material. Operators can also change this pattern by controlling the inner side of the rotating wheel 313 to press and slide, thereby causing the connecting key on the control shaft 328 to slide onto the sliding key 330 on the small screw 327. Rotating the control shaft 328 then drives the small screw 327 to rotate, causing the threaded sleeve 326 connected to the small screw 327 to move laterally. This causes the pull rod 325 to move laterally, and the end face of the pull rod 325 is located on the round sleeve 323, thus simultaneously driving the round sleeve 323 and the cam 321 to move. The locking key 322 on the control cam 321 disengages from the locking key 322 on the third gear 308, so power transmission disappears. At this point, the movable plate 318 moves downwards with gravity, automatically aligning the opening slot 319 with the inclined surface above the inclined plate 303. Finally, the granular material will flow smoothly at the opening trough 319, achieving continuous feeding.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A uniformity control device for roll good particulate dispensing, comprising: The utility model relates to a granular material feeding device The utility model discloses a granular material feeding device which comprises a material box (1) for feeding granular material, a base (2), a regulating mechanism (3) for regulating the granular material in the material box (1), wherein the regulating mechanism (3) comprises a uniform control device, a wide control device and a material control device. The uniform control device comprises a servo motor, the output end of the servo motor is in transmission connection with a power shaft (301) through a transmission part, the power shaft (301) is rotationally connected to the material box (1), a roller (302) is installed on the power shaft (301), a uniform distribution roller (304) is arranged below the roller (302), a first gear (305) and a third gear (308) are connected to the power shaft (301), a second gear (306) and a fourth gear (309) are respectively engaged with the first gear (305) and the third gear (308), and a large gear (310) is engaged with the surface of the fourth gear (309). The uniform distribution roller (304) comprises a half roller one (307) and a half roller two (311), the shaft centers of the half roller one (307) and the half roller two (311) are rotationally connected with a center shaft (312), the second gear (306) is connected with the half roller one (307), and the large gear (310) is connected with the half roller one (307). The wide control device comprises a limited mouth frame (317), the side surface of the limited mouth frame (317) is connected with a collection box (316), the collection box (316) is connected with a supporting plate (315), the supporting plate (315) is threadedly connected with a threaded sleeve (314), and the threaded sleeve (314) is connected with the center shaft (312). The limited mouth frame (317) and the threaded sleeve (314) are provided with two, the two limited mouth frames (317) are slidably connected with each other, and the threads of the two threaded sleeves (314) are opposite in rotation direction.

2. A uniform mixing and distribution control device for granular spreading of a roll good according to claim 1, wherein: The material control device comprises a movable piece (318), the side surface of the movable piece (318) is connected with a lever (320), the lever (320) is slidably connected in a sliding groove of the material box (1), the surface of the lever (320) is abutted with a cam (321), the cam (321) is connected with the power shaft (301), an opening groove (319) is formed in the movable piece (318), the right side of the movable piece (318) is slidably connected with an inclined piece (303), the inclined piece (303) is installed in the inside of the base (2), and the third gear (308) is clamped with the cam (321).

3. A uniformity control device for granular broadcast of a roll good according to claim 2, wherein: The opposite surfaces of the third gear (308) and the cam (321) are both connected with clamping keys (322), the third gear (308) rotates to drive the clamping keys (322) on the surface thereof to abut against the clamping keys (322) on the cam (321), thereby driving the synchronous rotation of the cam (321).

4. A uniformity control device for granular broadcast of a roll good according to claim 3, wherein: ​ 5. A uniformity control device for granular broadcast of a roll good according to claim 4, wherein: ​ 6. A uniformity control device for granular broadcast of a web material according to claim 5, wherein: ​ 7. A uniformity control device for granular broadcast of a roll good according to claim 6, wherein: The cam (321) is provided with an adjusting device, the adjusting device comprises a round sleeve (323), the round sleeve (323) is connected with the cam (321), a slot is formed in the round sleeve (323), a pull rod (325) is connected in the slot, a screw sleeve (326) is connected to the bottom of the pull rod (325), a small screw rod (327) is screw-connected in the screw sleeve (326), and the small screw rod (327) is rotationally connected to the surface of the threaded sleeve (314).

8. A uniformity control device for granular broadcast of a roll good according to claim 7, wherein: A connecting key is arranged on the control shaft (328), and a plug key (329) and a sliding key (330) are respectively arranged in the interiors of the threaded sleeve (314) and the small screw rod (327).

9. A uniformity control device for granular broadcast of a web material according to claim 8, wherein: The side of the material box (1) is connected with a limiting block (324), and the pull rod (325) is slidingly connected in the inner sliding groove of the limiting block (324).

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