Waste cleaning device for 3D printing

Abstract

The waste cleaning device for 3D printing comprises a shielding mechanism and a material guiding assembly, the shielding mechanism is either a shielding piece with a shaft penetrating hole matched with a spring and a notch-tooth structure to be tightly attached to an optical axis fixing piece, or the shielding mechanism is an elastic shielding soft sleeve with a radial penetrating seam, and the shielding piece is attached to an optical axis after being fixed in an adhesive mode; according to the device, through the synergistic effect of all the components, waste can be prevented from entering an optical axis hole from the source, the waste on the bottom plate can be guided to be separated from equipment without disassembling the outer frame, normal operation of a printer is not interfered, and the device is simple in structure, convenient to use and high in practicability. The equipment stability, the cleaning efficiency and the printing quality are remarkably improved, the adaptability is high, and the cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to 3D printing technical field, concretely relates to a waste cleaning device for 3D printing. BACKGROUND

[0002] 3D printing technology has been widely used in industrial manufacturing, medical health, education and scientific research and many other fields with the advantages of flexible forming, strong individual customization capability, etc. In the printing process, material melting and cooling, support structure stripping and other links will inevitably produce filament, granular or debris waste. If these waste materials are not timely and effectively treated, it will directly affect the equipment operation stability and the quality of the printed parts.

[0003] The current 3D printer mainly faces two major problems in waste cleaning:

[0004] First, there are natural holes and gaps in the cooperation of the optical axis and the optical axis fixing part. The fine waste produced by printing can easily enter the inside of the optical axis installation through these gaps. With the continuous accumulation of waste, the rotation resistance of the optical axis will increase, causing the motion accuracy to decrease, and in severe cases, causing the optical axis to jam and wear. Not only will it affect the dimensional accuracy and surface quality of the printed parts, but it will also need to be frequently disassembled for cleaning and maintenance, greatly increasing the use cost.

[0005] Second, it is difficult to clean the waste at the edge of the printer bottom plate. Due to the shielding effect of the outer frame, traditional manual cleaning and dust collector adsorption methods cannot completely remove the accumulated waste in this area. Long-term retention of waste may block the positioning marks on the bottom plate, affecting the positioning accuracy of subsequent printing, and even causing the nozzle to collide with the waste pile and other equipment failures. Complete cleaning often requires disassembling the outer frame, which is tedious and seriously affects the printing efficiency.

[0006] Therefore, there is an urgent need for a waste cleaning device that can accurately solve the two major pain points and does not interfere with the normal operation of the printer, making the cleaning operation convenient, in order to improve the practicality of 3D printing equipment and user experience. INVENTION CONTENTS

[0007] The utility model aims at solving one of the technical problems existing in the prior art.

[0008] The present application provides a waste cleaning device for 3D printing, which comprises a bottom plate, an outer frame, an optical axis and an optical axis fixing part, and further comprises a shielding mechanism and a material guiding assembly. The shielding mechanism is used to block the gap between the optical axis fixing part and the optical axis. The material guiding assembly is used to guide the waste to separate from the bottom plate.

[0009] The shielding mechanism comprises a shielding piece with a shaft hole. The shielding piece is installed in the optical axis fixing part through a fixing structure, and the shaft hole is sleeved outside the optical axis.

[0010] The fixing structure comprises a spring, a plurality of notches and a plurality of teeth, the notches are circumferentially spaced apart and arranged on the circumferential wall of the optical axis fixing member, the teeth are synchronously fixed to the outer periphery of the shielding sheet and are in sliding fit with the notches respectively, and the spring is used for applying an upward force to the shielding sheet, so that the teeth are in close fit with the top ends of the corresponding notches, thereby realizing the close fit between the shielding sheet and the optical axis fixing member.

[0011] The fixing structure further comprises a positioning sleeve, which is fixed to the bottom of the inner cavity of the optical axis fixing member and is used for radially limiting the spring, and the spring is sleeved outside the positioning sleeve, the lower end of the spring is in abutment with the bottom surface of the inner cavity of the optical axis fixing member, and the upper end of the spring is in abutment with the bottom surface of the shielding sheet.

[0012] The hole diameter of the shaft hole is greater than the diameter of the optical axis, and the outer diameter of the shielding sheet is matched with the size of the optical axis fixing member, so as to cover the opening of the optical axis fixing member.

[0013] The shielding sheet is made of rigid material, and the end surface of the shielding sheet is parallel to the end surface of the optical axis fixing member after the shielding sheet is in close fit with the optical axis fixing member.

[0014] The shielding mechanism comprises a shielding soft sleeve provided with a through slit, the shielding soft sleeve is made of elastic soft material, is inserted into the mounting hole of the optical axis fixing member, and the optical axis passes through the through slit, and the through slit can be automatically reset and is in close fit with the outer wall of the optical axis.

[0015] The through slit is provided with a plurality of slits, which are uniformly and spaced apart radially from the center of the shielding soft sleeve, and the optical axis passes through the center of the intersection of the slits.

[0016] The side surface of the shielding soft sleeve is fixed to the wall surface of the optical axis fixing member by means of gluing.

[0017] The material guiding assembly comprises a material guiding plate and a fixing assembly, the fixing assembly is used for detachably connecting the material guiding plate and the bottom plate, the material guiding plate comprises a lifting inclined surface and an outward extending guide surface, the lifting inclined surface is used for lifting waste under the action of the cleaning tool, the lower end of the lifting inclined surface is in close fit with the top surface of the bottom plate, the upper end of the lifting inclined surface is fixedly connected with the inner end of the outward extending guide surface, and the outward extending guide surface is inclined downward and outward, and the outer end of the outward extending guide surface passes through the outer frame.

[0018] The fixing assembly comprises a fixing groove and a fixing block, the fixing groove is arranged on the bottom plate and comprises an insertion section and a clamping section which are in communication, the width of the clamping section is smaller than that of the insertion section, and the fixing block comprises an integrated insertion section and a bending section, the insertion section is fixed to the bottom surface of the material guiding plate and has a width greater than that of the clamping section.

[0019] The beneficial effects of the utility model are as follows:

[0020] 1、Through the small gap reserved between the through shaft hole of the shielding piece in the shielding mechanism and the optical axis, and the continuous upward force exerted on the shielding piece by the spring, the shielding piece is tightly attached to the optical axis fixing part, and the circumferential limiting structure of the slot and the tooth is obtained, which can effectively block the waste from entering the optical axis mounting hole, and avoid the wear caused by the direct friction between the shielding piece and the optical axis, while ensuring the smooth movement of the optical axis.

[0021] 2、By adopting the shielding soft sleeve made of elastic soft material and provided with radial slits, and the installation method of gluing the side surface of the shielding soft sleeve to the wall surface of the optical axis fixing part, the slits can be automatically opened when the optical axis is inserted, and can be automatically reset and tightly attached to the outer wall of the optical axis after insertion, realizing self-adaptive sealing of different diameter optical axes, and the structure is simple, the cost is low, and the installation is convenient.

[0022] 3、By setting a lifting slope at the front end of the guide plate and connecting an outwardly inclined extension guide surface at the rear end, and stably installing the guide plate on the bottom plate by the fixed assembly, and the extension guide surface penetrates out of the printer frame, the waste on the bottom plate can be easily cleaned and guided to the outside of the equipment without disassembling the frame, greatly simplifying the cleaning operation and improving the cleaning efficiency.

[0023] 4、By setting a fixed groove containing an insertion section and a clamping section on the bottom plate, and setting a fixed block with a shape matching the fixed groove at the bottom of the guide plate, the guide plate can be quickly and stably installed on the bottom plate by the "insertion-horizontal movement" method, and it is also convenient to disassemble and replace, and can effectively prevent the guide plate from swinging up and down during cleaning. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a perspective view of a waste cleaning device for 3D printing in the embodiments of the present application,

[0025] Figure 2 is a partial sectional view of a waste cleaning device for 3D printing in the embodiments of the present application,

[0026] Figure 3 is Figure 2 is a local enlarged structure diagram at A in the embodiment,

[0027] Figure 4 is a shielding mechanism structure diagram in embodiments 2 and 3 of the present application,

[0028] Figure 5 is a shielding mechanism structure diagram in embodiment 4 of the present application,

[0029] Figure 6 is a guide assembly perspective view in the embodiments of the present application,

[0030] Figure 7 is a bottom plate perspective view in the embodiments of the present application.

[0031] Reference signs

[0032] 1-bottom plate, 2-outer frame, 3-optical axis, 4-optical axis fixing part, 5-shielding mechanism, 51-penetration shaft hole, 52-shielding piece, 53-fixing structure, 531-spring, 532-groove, 533-tooth, 534-positioning sleeve, 501-shielding soft sleeve, 502-penetration slot, 6-material guiding assembly, 61-material guiding plate, 611-lifting inclined surface, 612-extended guiding surface, 62-fixing assembly, 621-fixing groove, 6211-insertion section, 6212-clamping section, 622-fixing block, 6221-insertion section, 6222-bent section. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0034] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually a category, and are not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally represents a "or" relationship between the front and rear associated objects.

[0035] The waste cleaning device for 3D printing provided by the embodiments of the present application will be described in detail below in combination with the drawings, through specific embodiments and application scenarios.

[0036] Embodiment 1:

[0037] The embodiments of the present application provide a waste cleaning device for 3D printing, which comprises a bottom plate 1, an outer frame 2, an optical axis 3 and an optical axis fixing part 4, and further comprises a shielding mechanism 5 and a material guiding assembly 6. The shielding mechanism 5 is used to block the gap at the cooperation position of the optical axis fixing part 4 and the optical axis 3, and the material guiding assembly 6 is used to guide the waste to separate from the bottom plate 1.

[0038] As Figures 1 to 7As shown, due to the adoption of the above structure, through the combined design of the "shielding mechanism 5 + material guiding assembly 6", the two core waste cleaning pain points of the 3D printer can be solved at the same time: on the one hand, the shielding mechanism 5 can precisely cover the cooperation gap between the optical axis fixing part 4 and the optical axis 3, thereby blocking the filament and granular waste from entering the optical axis fixing part 4 from the source, on the other hand, the material guiding assembly 6 can directly guide the waste on the bottom plate 1 to separate from the equipment body, without the need to disassemble the outer frame 2 to complete the cleaning, greatly reducing the operation difficulty.

[0039] Embodiment 2:

[0040] In this embodiment, in addition to including the structural features of the preceding embodiments, the shielding mechanism 5 includes a shielding piece 52 with a shaft hole 51, the shielding piece 52 is installed in the optical axis fixing part 4 through a fixing structure 53, and the shaft hole 51 is sleeved outside the optical axis 3.

[0041] In this embodiment of the application, the fixing structure 53 includes a spring 531, a plurality of notches 532 and a plurality of teeth 533, each notch 532 is circumferentially spaced apart and provided on the peripheral wall of the optical axis fixing part 4, each tooth 533 is slidably fitted with the corresponding notch 532 and is synchronously fixed on the outer periphery of the shielding piece 52, and the spring 531 is used to apply an upward force to the shielding piece 52, so that each tooth 533 is in contact with the top end of the corresponding notch 532, so as to realize the close contact between the shielding piece 52 and the optical axis fixing part 4.

[0042] In this embodiment of the application, the fixing structure 53 further includes a positioning sleeve 534, the positioning sleeve 534 is fixedly arranged at the bottom of the inner cavity of the optical axis fixing part 4, and is used to radially limit the spring 531, the spring 531 is sleeved outside the positioning sleeve 534, the lower end of the spring 531 is in abutment with the bottom surface of the inner cavity of the optical axis fixing part 4, and the upper end of the spring 531 is in abutment with the bottom surface of the shielding piece 52.

[0043] As Figure 1 , Figure 2 and Figure 4As shown, due to the adoption of the above structure, the components of the fixing structure 53 form a synergistic effect: the notches 532 arranged at intervals along the wall of the fixing member 4 are in sliding fit with the teeth 533 on the outer periphery of the shielding piece 52, which can precisely limit the circumferential rotation of the shielding piece 52, ensure that the through-hole 51 is always coaxial with the optical axis 3, avoid the gap or jam caused by the deviation of the shielding piece 52, the upward force exerted by the spring 531 on the shielding piece 52 can make the shielding piece 52 tightly fit (without gap) with the end face of the optical axis fixing member 4, completely block the path of waste materials, and the newly added positioning sleeve 534 can limit the radial position of the spring 531, prevent the spring 531 from deviating or twisting after long-term stress, and ensure the stability of the spring force of the spring 531 (avoid the deviation of the shielding piece 52 due to the deviation of the spring 531), so that the overall structure not only realizes reliable sealing of the hole, but also can adapt to the axial micro-displacement of the optical axis 3 (such as the expansion or vibration of the optical axis 3 during printing), without affecting the normal function of the moving part.

[0044] Embodiment 3:

[0045] In this embodiment, in addition to the structural features of the foregoing embodiments, the hole diameter of the through-hole 51 is larger than the diameter of the optical axis 3, and the outer diameter of the shielding piece 52 is adapted to the size of the optical axis fixing member 4 to cover the opening of the optical axis fixing member 4.

[0046] In this embodiment of the application, the shielding piece 52 is made of rigid material, and after the shielding piece 52 is attached to the optical axis fixing member 4, the end face of the shielding piece 52 is parallel to the end face of the optical axis fixing member 4.

[0047] As shown in Figure 1 , Figure 2 and Figure 4 , due to the adoption of the above structure, the hole diameter of the through-hole 51 is larger than the diameter of the optical axis 3, a small gap can be reserved between the shielding piece 52 and the optical axis 3 to avoid direct friction between them (to prevent the optical axis 3 from being worn or the shielding piece 52 from being scratched, and to prolong the service life of the components), and the gap is much smaller than the size of the common waste materials, so it will not cause the waste materials to enter. The shielding piece 52 is made of rigid material (such as ABS plastic or thin metal sheet), which can avoid the generation of gaps due to deformation during long-term use, and its outer diameter is adapted to the size of the optical axis fixing member 4, which can completely cover the opening area of the optical axis fixing member 4 without blind area. The end face of the shielding piece 52 is parallel to the end face of the optical axis fixing member 4, which further ensures the sealing performance and eliminates the problem of "partial gap leakage", and is more suitable for high-frequency and high-load printing scenarios compared with the flexible shielding structure.

[0048] Embodiment 4:

[0049] In this embodiment, in addition to the structural features of the preceding embodiments, the shielding mechanism 5 comprises a shielding sleeve 501 provided with slits 502, the shielding sleeve 501 is made of elastic soft material, and is inserted into the mounting hole of the optical axis fixing member 4, the optical axis 3 passes through the slits 502, and the slits 502 can automatically reset and fit the outer wall of the optical axis 3.

[0050] In this embodiment of the application, the slits 502 are provided in several rows and are uniformly and regularly distributed radially outward from the center of the shielding sleeve 501, and the optical axis 3 passes through the center where the slits 502 intersect.

[0051] In this embodiment of the application, the side surface of the shielding sleeve 501 is fixed to the wall surface of the optical axis fixing member 4 by adhesive.

[0052] As shown in Figure 1 and Figure 3 Due to the above structure, the elastic soft material (such as silicone or elastic rubber) of the shielding sleeve 501 has excellent deformation ability: the radially distributed slits 502 can be automatically opened when the optical axis 3 is inserted, and can adapt to optical axes 3 of different diameters (within a certain range), and after insertion, the slits 502 can automatically reset and tightly fit the outer wall of the optical axis 3 by relying on the material elasticity, forming a “flexible seal”. Even if the optical axis 3 has slight radial jumping, the slits 502 can also deform synchronously with the optical axis 3, always blocking the waste from entering, and the side adhesive fixing method does not require additional installation structure (such as screws or buckles), simplifying the installation steps, and the adhesive surface can fill the small gap between the shielding sleeve 501 and the wall surface of the optical axis fixing member 4, further improving the sealing effect. Compared with the “shielding piece 52 + spring 531” structure, this scheme eliminates metal components, has lower cost and lighter weight, and avoids the risk of spring 531 rust and jamming, and is suitable for humid and dusty printing environments.

[0053] Embodiment 5:

[0054] In this embodiment, in addition to the structural features of the preceding embodiments, the material guiding assembly 6 comprises a material guiding plate 61 and a fixing assembly 62, the fixing assembly 62 is used to detachably connect the material guiding plate 61 and the bottom plate 1, the material guiding plate 61 comprises a lifting inclined surface 611 and an outward extending guide surface 612, the lifting inclined surface 611 is used to lift the waste under the action of the cleaning tool, the lower end of the lifting inclined surface 611 is fitted with the top surface of the bottom plate 1, and the upper end is fixedly connected with the inner end of the outward extending guide surface 612, and the outward extending guide surface 612 is inclined downward and outward, and the outer end of the outward extending guide surface 612 passes through the outer frame 2.

[0055] As shown in Figures 4 to 7As shown, due to the above-mentioned structure, the special shape design of the guide plate 61 is perfectly suited to the needs of cleaning waste at the bottom of the printer: the lower end of the lifting slope 611 is in contact with the top surface of the base plate 1, and the waste accumulated on the base plate 1 (such as support structure fragments and printing residue) can be lifted along the slope by tools such as cleaning brushes, avoiding the accumulation of waste in the gap between the base plate 1 and the outer frame 2. The lifted waste can be discharged from the equipment along the extended guide surface 612 without the need for manual secondary cleaning. The guide component 6 is detachably connected to the base plate 1. When the guide plate 61 is worn or blocked, it can be quickly disassembled and replaced without affecting the overall operation of the printer. In addition, the design of the extended guide surface 612 extending out of the outer frame 2 completely solves the problem of "front frame blocking waste cleaning", and the bottom waste cleaning can be completed without disassembling the outer frame 2.

[0056] Example 6:

[0057] In this embodiment, in addition to the structural features of the aforementioned embodiments, the fixing component 62 includes a fixing groove 621 and a fixing block 622. The fixing groove 621 is formed on the base plate 1 and includes an insertion section 6211 and a snap-fit ​​section 6212 that are interconnected. The width of the snap-fit ​​section 6212 is smaller than the width of the insertion section 6211. The fixing block 622 includes an integrally formed insertion section 6221 and a bent section 6222. The insertion section 6221 is fixed to the bottom surface of the guide plate 61 and its width is greater than that of the snap-fit ​​section 6212.

[0058] like Figures 5 to 7 As shown, due to the above-mentioned structure, the "insertion-clamping" design of the fixing component 62 achieves a quick and stable connection between the guide plate 61 and the base plate 1: the insertion section 6211 of the fixing groove 621 is relatively wide, which facilitates the quick insertion of the insertion section 6221 of the fixing block 622 (no precise alignment is required during installation). After insertion, it moves laterally to the clamping section 6212 (the width of the clamping section 6212 is smaller than that of the insertion section 6221). The size limit can prevent the fixing block 622 from coming out of the clamping section 6212. The top surface of the bending section 6222 of the fixing block 622 fits against the bottom surface of the base plate 1, which can limit the up and down swing of the guide plate 61 (avoiding the guide plate 61 shaking and causing waste to spill when cleaning waste). At the same time, the bending section 6222 can disperse the cleaning force (such as the pushing force of the cleaning brush) borne by the guide plate 61, preventing the guide plate 61 from deforming. This structure can be installed and disassembled without tools, shortening maintenance time, and eliminating the risk of stripped screws or corrosion. It has stronger long-term stability.

[0059] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the method and apparatus of the present application can be carried out by someone other than the person named in the independent claims, and that the scope of the independent claims is not limited to the person named in the independent claims. In addition, it should be noted that the scope of the method and apparatus of the present application is not limited to performing the functions in the order discussed or illustrated, but can include performing the functions in a substantially simultaneous manner or in the reverse order, for example, the described method can be performed in an order different from that described, and various steps can be added, omitted, or combined, in addition, features described with reference to certain examples can be combined in other examples.

[0060] The embodiments of the present application described above are merely illustrative, and are not intended to limit the present application, and the specific embodiments described above are merely illustrative, and are not intended to limit the present application, and the person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, and all forms belong to the protection of the present application.

Claims

1. A waste cleaning device for 3D printing, comprising a bottom plate, an outer frame, an optical axis and an optical axis fixing piece, characterized in that, The device further comprises a shielding mechanism and a material guiding assembly, the shielding mechanism is used for shielding the gap between the optical axis fixing member and the optical axis, and the material guiding assembly is used for guiding the waste to separate from the bottom plate.

2. A waste cleaning device for 3D printing according to claim 1, characterized in that, The shielding mechanism comprises a shielding piece with a through hole, the shielding piece is installed in the optical axis fixing member through a fixing structure, and the through hole is sleeved outside the optical axis.

3. A waste cleaning device for 3D printing according to claim 2, characterized in that, The fixing structure comprises a spring, a plurality of notches and a plurality of teeth, each notch is spaced apart in the circumferential direction and is arranged on the circumferential wall of the optical axis fixing member, each tooth is slidably connected with the corresponding notch and is fixed on the outer circumference of the shielding piece, and the spring is used for applying an upward force to the shielding piece, so that the top end of each tooth is in close contact with the corresponding notch, thereby realizing the close contact between the shielding piece and the optical axis fixing member.

4. A waste cleaning device for 3D printing according to claim 3, characterized in that, The fixing structure further comprises a positioning sleeve, the positioning sleeve is fixedly arranged at the bottom of the inner cavity of the optical axis fixing member and is used for limiting the radial position of the spring, the spring is sleeved outside the positioning sleeve, the lower end of the spring is in abutment with the bottom surface of the inner cavity of the optical axis fixing member, and the upper end of the spring is in abutment with the bottom surface of the shielding piece.

5. A waste cleaning device for 3D printing according to claim 2, wherein, The diameter of the through hole is greater than the diameter of the optical axis, and the outer diameter of the shielding piece is matched with the size of the optical axis fixing member, so as to cover the opening of the optical axis fixing member.

6. The waste cleaning device for 3D printing according to claim 1, wherein, The shielding mechanism comprises a shielding soft sleeve with a through slit, the shielding soft sleeve is made of elastic soft material, is inserted into the mounting hole of the optical axis fixing member, the optical axis passes through the through slit, and the through slit can automatically reset and abut against the outer wall of the optical axis.

7. A waste cleaning device for 3D printing according to claim 6, characterized in that, The through slit is provided with a plurality of slits which are uniformly and evenly distributed radially outward from the center of the shielding soft sleeve, and the optical axis passes through the center of the intersection of the slits.

8. A waste cleaning device for 3D printing according to claim 6, wherein, The side surface of the shielding soft sleeve is fixed to the wall surface of the optical axis fixing member by means of adhesion.

9. The waste cleaning device for 3D printing according to claim 1, wherein, The material guiding assembly comprises a material guiding plate and a fixing assembly, the fixing assembly is used for detachably connecting the material guiding plate with the bottom plate, the material guiding plate comprises a lifting inclined surface and an outward extending guiding surface, the lifting inclined surface is used for lifting the waste under the action of the cleaning tool, the lower end of the lifting inclined surface is in abutment with the top surface of the bottom plate, and the upper end of the lifting inclined surface is fixedly connected with the inner end of the outward extending guiding surface, the outward extending guiding surface is inclined outward and downward, and the outer end of the outward extending guiding surface passes through the outer frame.

10. A waste cleaning device for 3D printing according to claim 9, characterized in that, The fixing assembly comprises a fixing groove and a fixing block, the fixing groove is arranged on the bottom plate and comprises an insertion section and a clamping section which are in communication with each other, the width of the clamping section is smaller than the width of the insertion section, and the fixing block comprises an integrated insertion section and a bending section, the insertion section is fixedly arranged on the bottom surface of the material guiding plate and has a width greater than that of the clamping section.

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