A feeding device for MPP pipe production

Abstract

The present invention relates to the technical field of MPP pipe production equipment, and specifically to a feeding device for MPP pipe production, comprising a fixed plate, a spiral feeder and an outer shell, wherein the fixed plate is fixedly installed on a working ground by expansion bolts, the spiral feeder is fixedly installed on the top of the fixed plate, the outer shell is installed at the feeding port of the spiral feeder, an annular sleeve is installed on the top of the outer shell, a discharge chamber is formed between the annular sleeve and the inner wall of the outer shell, a plug-in hole is provided at the center position of the outer side of the annular sleeve, a discharge hole is opened at the lower position of the inner side of the annular sleeve, a horizontal plate is fixedly installed on the top of the plug-in hole, circular holes are opened at equal intervals in the inner circumferential direction of the horizontal plate, a rectangular hole is opened at the center position of the horizontal plate, an annular baffle is fixedly installed on the top of the horizontal plate and between the circular hole and the rectangular hole, a feeding part is installed inside the plug-in hole, and the present invention has the characteristics of quantitative proportioning, mixed feeding, wide application range and low waste rate.

Description

Technical Field

[0001] The invention relates to the technical field of MPP pipe production equipment, in particular to a material adding device for MPP pipe production. Background Art

[0002] MPP pipe is also called MPP power cable protection pipe and MPP cable protection pipe, which is divided into trenching type and non-trenching type; PP non-trenching power pipeline is also called MPP jacking pipe or drag pipe. The main connection method of MPP pipe is butt welding with hot melt welding machine. MPP pipe has the characteristics of high temperature resistance and external pressure resistance, so it is widely used as pipe for cable groups of high-voltage transmission lines above 10KV. The main production process of MPP pipe includes: raw material feeding, screw extruder molding, spray vacuum setting box for spraying, immersion cooling water tank, ink printing machine, etc. Among them, raw material feeding mainly serves the screw extruder, adding the raw materials required for product production into the screw extruder.

[0003] Commonly used feeding devices generally use a spiral feeding method. In the production process of MPP pipes, the raw materials are mainly composed of modified polypropylene and additives. The ratio of modified polypropylene and additives varies depending on the finished product. When a spiral feeder is used for feeding, its feeding port cannot quantitatively proportion the raw materials fed. The operator is also required to weigh and proportion the raw materials before feeding, making the entire feeding process relatively cumbersome. Summary of the invention

[0004] In view of the problem that when a spiral feeder is used for feeding in the prior art, its feeding port cannot quantitatively proportion the fed raw materials, and the operator is required to weigh and proportion the raw materials before feeding, which makes the entire feeding process relatively cumbersome, the present invention provides a feeding device for MPP pipe production.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a feeding device for MPP pipe production, comprising a fixed plate, a spiral feeder and an outer shell, wherein the fixed plate is fixedly installed on the working ground by expansion bolts, the spiral feeder is fixedly installed on the top of the fixed plate, the outer shell is installed at the feeding port of the spiral feeder, an annular sleeve is installed on the top of the outer shell, a discharge chamber is formed between the annular sleeve and the inner wall of the outer shell, a plug-in hole is provided at the center position of the outer side of the annular sleeve, a discharge hole is provided at the lower position inside the annular sleeve, a horizontal plate is fixedly installed on the top of the plug-in hole, circular holes are provided at equal intervals inside the horizontal plate in the circumferential direction, a rectangular hole is provided at the center position of the horizontal plate, an annular baffle is fixedly installed on the top of the horizontal plate and at a position between the circular hole and the rectangular hole, a feeding part is installed inside the plug-in hole, a driving assembly is connected to the top of the feeding part, and the spiral feeder is used to transport the raw materials for MPP pipe production to the feed port of the screw extruder;

[0006] The feeding part includes a moving tube vertically plugged into the inner wall of the plug hole, a conical groove is formed inside the moving tube, a blanking hole is formed on the outer wall of the moving tube, and the blanking hole is connected to the bottom of the conical groove, leakage holes are formed at equal intervals in the circumferential direction on the top of the moving tube, and the leakage holes are connected to the top of the conical groove, a plurality of sleeves are fixedly installed on the top of the moving tube, a circular arc hole is formed on the outer side of each sleeve at a lower position, and each sleeve is plugged into the circular hole;

[0007] The top end surface of the annular sleeve is a conical surface, and a circular groove is provided at the connection between the top conical surface of the annular sleeve and the horizontal plate, a sealing ring is placed in the circular groove, and a plurality of material storage grooves are provided at equal intervals in the circumferential direction at the bottom of the circular groove, and a material discharge port is provided at the bottom of each material storage groove, and a material feeding area is formed between the top conical surface of the annular sleeve, the sealing ring, the horizontal plate, the sleeve and the annular baffle;

[0008] A push rod is fixedly installed at the bottom center of the moving tube, and support rods are installed at equal intervals on the outer wall of the bottom of the push rod. Fixed brackets are fixedly connected to the end faces of several support rods. An isolation ring block is installed at the top position of the fixed bracket. Cross bars are welded at equal intervals on the inner wall of the isolation ring block. A circular arc baffle is fixedly installed at the end of each cross bar.

[0009] The driving assembly includes a driving motor installed at a position above the outer shell through a fixed frame, the output end of the driving motor is connected to a driving disc through a driving shaft, a driving arm is installed inside the driving disc through an eccentric rod, the bottom of the driving arm is connected to a shaft seat, the shaft seat is fixedly installed at the top center position of the moving tube, and the driving arm is located in the rectangular hole.

[0010] An annular groove is provided on the inner wall of the plug hole, and the annular groove is connected with the discharge port, a slide groove is provided at the bottom of the discharge port, a limit slider is installed inside the slide groove, a tension spring is installed between the limit slider and the inner wall of the slide groove, a quantitative plate is installed on the top of the limit slider, and the quantitative plate is plugged into the discharge port, a quantitative hole is provided inside the quantitative plate, an extrusion ring is welded on the outer wall of the mobile tube and in the area of ​​the annular groove, and the cross section of the extrusion ring is a trapezoidal surface;

[0011] An extended ring block is installed at the bottom of the isolation ring block, and the inner wall of the extended ring block is close to the bottom outer wall of the annular sleeve. When the eccentric rod is at the lowest point, the lower end face of the extended ring block is below the bottom of the annular sleeve. When the eccentric rod is at the highest point, the lower end face of the extended ring block is in the discharge chamber.

[0012] Furthermore, the inner wall of the isolation ring block is welded with path rods at equal intervals, and the path rods in different horizontal planes are arranged in an interlaced manner, and the gaps between the interlaced path rods form different falling path channels, and the falling path channels are only used for the dropping of auxiliary agents.

[0013] Furthermore, the plurality of quantitative holes include at least two different sizes, and the quantitative holes of the same size are circumferentially distributed with equal spacing.

[0014] Furthermore, when the eccentric rod is located at the lowest point, the horizontal height of the upper end surface of the sleeve is higher than the horizontal height of the upper end surface of the horizontal plate.

[0015] Furthermore, when the eccentric rod is located at the highest point, the horizontal height of the lower edge of the arc hole is higher than the horizontal height of the lower end surface of the horizontal plate.

[0016] Furthermore, the lower end surfaces of the discharge hole and the drop hole are both inclined surfaces.

[0017] 1: The present invention provides a feeding device for MPP pipe production, which is provided with components such as a feeding part and a driving assembly. The present invention puts modified polypropylene and additives into different areas for storage through the mutual cooperation of the feeding part and the driving assembly. When the driving assembly is started to work continuously, automatic proportioning work can be achieved during the feeding process, without the need for operators to perform manual weighing before feeding, while meeting the production proportioning requirements of different MPP pipe products.

[0018] 2: The present invention provides a feeding device for MPP pipe production, which is provided with components such as an extension ring block. The state of the discharge chamber, that is, whether it is sealed, is changed by the extension ring block, so that the raw materials that have been quantitatively proportioned enter the spiral feeder in an integral form. When the raw materials slide in as a whole, they will collide and roll with the bottom of the outer shell to achieve partial mixing of the raw materials, and different falling path channels are formed at the gaps between the path rods arranged in an interlaced manner. When the PP toughening agent and the masterbatch auxiliary materials fall from one end of the discharge port, the PP toughening agent and the masterbatch auxiliary materials will fall into the discharge chamber along different falling channels, increasing the discreteness of the PP toughening agent and the masterbatch auxiliary materials falling into the discharge chamber, that is, the PP toughening agent and the masterbatch auxiliary materials fall into the discharge chamber non-vertically, and will not be concentrated on the modified polypropylene. The situation occurs, so that the raw materials are more uniform when they enter the spiral feeder for feeding later; at the same time, the present invention effectively reduces the waste of raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a stereogram of the overall structure of the present invention;

[0021] Figure 2 It is a partial structural section of the present invention Figure 1 ;

[0022] Figure 3 It is a partial structural cross-sectional view of the present invention;

[0023] Figure 4 The present invention Figure 2 A partial enlarged schematic diagram of the middle A area;

[0024] Figure 5 The present invention Figure 2 A partial enlarged schematic diagram of the middle B area;

[0025] Figure 6 The present invention Figure 2 A partial enlarged schematic diagram of the middle C area;

[0026] In the figure: 1, fixed plate; 2, spiral feeder; 3, outer shell; 4, annular sleeve; 5, feeding part; 6, driving assembly; 41, plug hole; 42, discharge hole; 43, horizontal plate; 44, round hole; 45, rectangular hole; 46, annular baffle; 47, annular groove; 48, storage trough; 49, discharge port; 40, sealing ring; 51, moving tube; 52, conical groove; 53, drop hole; 54, leakage hole; 55, sleeve; 56, arc hole ; 511, push rod; 512, support rod; 513, fixed bracket; 514, isolation ring block; 515, cross bar; 516, arc baffle; 61, drive motor; 62, drive disc; 63, drive arm; 64, shaft seat; 491, annular groove; 492, quantitative plate; 493, quantitative hole; 494, slide groove; 495, limit slider; 496, tension spring; 497, extrusion ring; 5141, extension ring block; 5142, path rod. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] like Figure 1-Figure 6As shown, a feeding device for MPP pipe production described in the present invention comprises a fixing plate 1, a spiral feeder 2 and an outer shell 3, wherein the fixing plate 1 is fixedly installed on the working ground by expansion bolts, the spiral feeder 2 is fixedly installed on the top of the fixing plate 1, the outer shell 3 is installed at the feeding port of the spiral feeder 2, an annular sleeve 4 is installed on the top of the outer shell 3, a discharge chamber is formed between the annular sleeve 4 and the inner wall of the outer shell 3, a plug hole 41 is provided at the center position of the outer side of the annular sleeve 4, a discharge hole 42 is provided at the lower position of the inner side of the annular sleeve 4, and the plug hole 41 A horizontal plate 43 is fixedly installed on the top, and circular holes 44 are opened at equal intervals in the circumferential direction inside the horizontal plate 43. A rectangular hole 45 is opened at the center of the horizontal plate 43. An annular baffle 46 is fixedly installed on the top of the horizontal plate 43 and located between the circular hole 44 and the rectangular hole 45. A feeding part 5 is installed inside the plug hole 41, and a driving component 6 is connected to the top of the feeding part 5. The screw feeder 2 is used to transport the raw materials for the production of MPP pipes to the feed port of the screw extruder. Therefore, during the installation project, it is necessary to ensure that the discharge port of the screw feeder 2 is directly opposite to the feed port of the screw extruder;

[0029] It should be noted that the raw materials for the production of MPP pipes are composed of modified polypropylene and additives, the additives mainly include PP toughening agents and masterbatch auxiliary materials, the modified polypropylene is the main raw material, the PP toughening agent functions to increase the overall toughness of the finished MPP pipe, and the masterbatch auxiliary materials are used to adjust the appearance color of the finished MPP pipe. The raw materials of the embodiment of the present invention are modified polypropylene, PP toughening agent and masterbatch auxiliary materials for illustration;

[0030] See also Figure 2-Figure 6 The feeding part 5 includes a moving tube 51 vertically inserted into the inner wall of the plug hole 41, a conical groove 52 is provided inside the moving tube 51, a blanking hole 53 is provided on the outer wall of the moving tube 51, and the blanking hole 53 is communicated with the bottom of the conical groove 52, a leakage hole 54 is provided at equal intervals in the circumferential direction on the top of the moving tube 51, and the leakage hole 54 is communicated with the top of the conical groove 52, and a plurality of sleeves 55 are fixedly installed on the top of the moving tube 51, and a circular arc hole 56 is provided at the lower position of the outer side of each sleeve 55, and each sleeve 55 is inserted into the circular hole 44;

[0031] See also Figure 2The top end surface of the annular sleeve 4 is a conical surface. A circular groove 47 is provided at the connection between the top conical surface of the annular sleeve 4 and the horizontal plate 43. A sealing ring 40 is placed in the circular groove 47. A plurality of material storage grooves 48 are provided at equal intervals in the circumferential direction at the bottom of the circular groove 47. A discharge port 49 is provided at the bottom of each material storage groove 48. A material feeding area is formed between the top conical surface of the annular sleeve 4, the sealing ring 40, the horizontal plate 43, the sleeve 55 and the annular baffle 46. When working, the sealing ring 40 is manually opened first, so that a plurality of material storage grooves are 48 leaks out, PP toughening agent and masterbatch auxiliary materials are sequentially put into the storage tank 48, and then the sealing ring 40 is covered in the ring groove 47, and finally the modified polypropylene material is poured into the feeding area. It should be noted that the volume of the storage tank 48 can meet the production of a batch of MPP pipes (in the production process of a batch of MPP pipes, the consumption of auxiliary agents is 0.25-0.3% of the modified polypropylene, which is much less than the consumption of modified polypropylene), that is, in the working process of the present invention, it is not necessary to open the sealing ring 40 for secondary feeding of auxiliary agents;

[0032] See also Figure 2-Figure 6 A push rod 511 is fixedly installed at the bottom center of the moving tube 51, and support rods 512 are installed at equal intervals on the outer wall of the bottom of the push rod 511. The end faces of several support rods 512 are fixedly connected with fixed brackets 513. The top position of the fixed bracket 513 is installed with an isolation ring block 514. The inner wall of the isolation ring block 514 is welded with cross bars 515 at equal intervals in the circumferential direction. The end of each cross bar 515 is fixedly installed with an arc baffle 516. The moving tube 51 can be relatively centrally located at the annular sleeve 4. The inner wall of the plug hole 41 is displaced in the vertical direction, and after the displacement occurs, the moving tube 51 can drive the arc baffle 516 to move together through the push rod 511, the support rod 512, the fixed bracket 513, the isolation ring block 514 and the cross bar 515. In this process, the push rod 511, the support rod 512, the fixed bracket 513, the isolation ring block 514 and the cross bar 515 can be understood as connecting parts formed by mutual welding. The arc baffle 516 is connected to the moving tube 51 through the connecting part and moves together;

[0033] The driving assembly 6 includes a driving motor 61 installed at a position above the outer shell 3 through a fixing frame, the output end of the driving motor 61 is connected to a driving disc 62 through a driving shaft, a driving arm 63 is installed inside the driving disc 62 through an eccentric rod, the bottom of the driving arm 63 is connected to a shaft seat 64, the shaft seat 64 is fixedly installed at the top center position of the moving tube 51, and the driving arm 63 is located in the rectangular hole 45, and the rectangular hole 45 reserves a certain space for the left and right swing amplitude of the driving arm 63 when working, that is, to ensure that the driving arm 63 can work normally. In the initial state, the eccentric rod inside the driving disc 62 is located at the highest point position of the driving disc 62 (that is, the end of the driving arm 63 connected to the eccentric rod is deflected to the highest point position, and the moving tube 51 is displaced to the highest water level relative to the inner wall of the plug-in hole 41). The above-mentioned MPP tube raw material feeding process can be executed in this state. In this state, a plurality of arc holes 56 are located in the feeding area. The modified polypropylene material fed into the feeding area will fall into the conical groove 52 along the arc holes 56. The horizontal position of the drop hole 53 provided in the mobile tube 51 is higher than the horizontal position of the discharge hole 42 (that is, the drop hole 53 and the discharge hole 42 are misaligned and not connected to each other). The drop hole 53 is blocked by the inner wall of the plug hole 41, so that the modified polypropylene material falling into the conical groove 52 will not slide from the drop hole 53. The arc baffle 516 is moved to the discharge port 49, and the discharge port 49 is blocked by the arc baffle 516, so that the PP toughening agent and masterbatch auxiliary materials fed into the storage tank 48 will not slide from the discharge port 49.During specific operation, the driving motor 61 is manually driven to enter the working state, and the driving motor 61 drives the driving disc 62 to rotate at a constant speed. After the driving disc 62 rotates, the driving arm 63 drives the moving tube 51 to make a vertical reciprocating motion in the plug-in hole 41. When the moving tube 51 moves from the initial position to the lowest position, the blanking hole 53 gradually moves toward the position of the discharge hole 42. When the blanking hole 53 moves to partially overlap or completely overlap with the discharge hole 42, the modified polypropylene material in the conical groove 52 will enter the inner bottom end of the annular sleeve 4 along the discharge hole 42, and continue to slide from the gap between the bottom of the annular sleeve 4 and the outer shell 3 and finally enter the spiral feeder 2 to realize the filling of modified polypropylene. In this embodiment, when the moving tube 51 is constrained to move to the lowest horizontal position, the discharge hole 42 and the blanking hole 53 are completely overlapped. When the moving tube 51 moves vertically upward again, the discharge hole 42 and the blanking hole 53 are misaligned with each other, and the filling process of the modified polypropylene is no longer executed. , that is, intermittent quantitative feeding of modified polypropylene is realized. At the same time, during the process of adding modified polypropylene, the moving pipe 51 drives the arc baffle 516 to move through the above-mentioned connecting piece, so that the arc baffle 516 moves vertically downward from one side of the discharge port 49, and the discharge port 49 loses the blocking effect of the arc baffle 516. The PP toughening agent and masterbatch auxiliary materials put in the storage tank 48 are squeezed out from one side of the discharge port 49 under the action of their own gravity. Similarly, the modified polypropylene enters the spiral feeding In the machine 2 (this following can be understood as the relative setting level of the discharge port 49 is higher than the level of the discharge hole 42, and the time for the PP toughening agent and the masterbatch auxiliary material to fall from one side of the discharge port 49 into the spiral feeder 2 is slower than the time required for the modified polypropylene), the feeding process of the PP toughening agent and the masterbatch auxiliary material is realized, and after the moving pipe 51 is reset, the arc baffle 516 is again blocked on one side of the discharge port 49, that is, the feeding of the PP toughening agent and the masterbatch auxiliary material is a similar equal amount feeding process. ;

[0034] It is further explained that the above-mentioned similar equal amount adding process is explained as follows: the principle of PP toughening agent and masterbatch auxiliary materials falling from one side of the discharge port 49 is that the gravity of the raw materials stored in the upper part of the storage tank 48 gravity squeezes the raw materials at the discharge port 49 to make them leave the discharge port 49. As the raw materials in the storage tank 48 are added, the raw materials at the upper part of the discharge port 49 gradually decrease, and the extrusion pressure applied to the raw materials at the discharge port 49 decreases accordingly, and the raw materials falling from the discharge port 49 are relatively reduced. The solution can be solved by feeding the materials into the storage tank 48. The feeding process needs to be added when there is no modified polypropylene raw material in the feeding area to prevent the modified polypropylene raw material from falling into the storage tank 48.

[0035] See also Figure 2-Figure 6In another embodiment, an annular groove 491 is provided on the inner wall of the plug hole 41, and the annular groove 491 is communicated with the discharge port 49, a slide groove 494 is provided at the bottom of the discharge port 49, a limit slider 495 is installed inside the slide groove 494, a tension spring 496 is installed between the limit slider 495 and the inner wall of the slide groove 494, a quantitative plate 492 is installed on the top of the limit slider 495, and the quantitative plate 492 is plugged into the discharge port 49, and a quantitative hole 493 is provided inside the quantitative plate 492, an outer wall of the mobile tube 51 and an area located in the annular groove 491 are welded with an extrusion ring 497, and the cross-section of the extrusion ring 497 is a trapezoidal surface, and the raw materials are put into the storage tank 48 When the moving tube 51 moves vertically downward, part of the raw materials will directly fall into the quantitative hole 493. In the process of the moving tube 51 moving vertically downward, the moving tube 51 drives the extrusion ring 497 to move together. The inclined surface of the extrusion ring 497 will apply an extrusion force to one end of the quantitative plate 492. Under the action of the extrusion force, the quantitative plate 492 moves toward the discharge port 49 together with the limit slider 495. After moving a certain distance, the quantitative hole 493 is displaced from the initial storage tank 48 to the discharge chamber. The raw materials stored in the quantitative hole 493 lose the supporting force at the bottom of the storage tank 48, and then the raw materials stored in the quantitative hole 493 will fall under the action of their own gravity. This method can realize the quantitative loading of PP toughening agent and masterbatch auxiliary materials.

[0036] See also Figure 2 and Figure 6 In another embodiment, an extension ring block 5141 is installed at the bottom of the isolation ring block 514, and the inner wall of the extension ring block 5141 is close to the bottom outer wall of the annular sleeve 4, and when the eccentric rod is at the lowest point, the lower end surface of the extension ring block 5141 is located below the bottom of the annular sleeve 4, and when the eccentric rod is at the highest point, the lower end surface of the extension ring block 5141 is located in the discharge chamber. In specific operation, when the moving tube 51 moves vertically downward, when the inner wall of the extension ring block 5141 contacts the bottom outer wall of the annular sleeve 4, the extension ring block 5141 seals the discharge chamber. The added raw materials cannot fall directly into the screw feeder 2, and will stay in the closed area formed by the discharge chamber and the extended ring block 5141 for a certain period of time. When the movable tube 51 moves vertically upward to reset, the extended ring block 5141 will be separated from the bottom outer wall of the annular sleeve 4, and the discharge chamber will return to its initial state (i.e., unsealed state). In this way, the raw materials that have been quantitatively proportioned can enter the screw feeder 2 as a whole (entering from the front and back in a non-unsealed state). When the whole slides in, the raw materials will collide and tumble with the bottom of the outer shell 3 to achieve partial mixing of the raw materials.

[0037] See also Figure 2 and Figure 6The inner wall of the isolation ring block 514 is welded with path rods 5142 at equal intervals, and the path rods 5142 in different horizontal planes are arranged in an interlaced manner, and the gaps between the interlaced path rods 5142 form different falling path channels. When the PP toughening agent and the masterbatch auxiliary materials fall from one end of the discharge port 49, the PP toughening agent and the masterbatch auxiliary materials will fall into the discharge chamber along different falling channels, increasing the discreteness of the PP toughening agent and the masterbatch auxiliary materials falling into the discharge chamber, that is, the PP toughening agent and the masterbatch auxiliary materials fall into the discharge chamber non-vertically, and will not be concentrated on the modified polypropylene, so that the raw materials will be more uniform when they enter the spiral feeder 2 for loading later.

[0038] See also Figure 2 and Figure 3 , several of the quantitative holes 493 include at least two different sizes. The ratio of the additive to the modified polypropylene and the selection of the additive are determined by the production size of the MPP tube and the form of the product. When different MPP tube production requirements are required, multiple quantitative holes 493 can meet the addition requirements of different types of additives and different amounts of additives. It should be noted that the quantitative addition amount of the modified polypropylene is determined by the rotation speed of the drive motor 61, that is, the overlap time of the discharge hole 42 and the drop hole 53 determines the addition amount of the modified polypropylene, and the quantitative holes 493 of the same size are distributed at equal intervals in the circumferential direction, so that the additives in the quantitative holes 493 fall into the discharge chamber in a dot matrix at equal distances to ensure the uniformity of the falling of the additives.

[0039] See also Figure 2 When the eccentric rod is at the lowest point, the horizontal height of the upper end surface of the sleeve 55 is higher than the horizontal height of the upper end surface of the horizontal plate 43, which prevents the modified polypropylene from falling into the gap between the horizontal plate 43 and the moving tube 51 when the modified polypropylene is put into the feeding area in the initial state, causing unnecessary waste of the modified polypropylene.

[0040] See also Figure 2-Figure 6 When the eccentric rod is at the highest point, the horizontal height of the lower edge of the arc hole 56 is higher than the horizontal height of the lower end surface of the horizontal plate 43, ensuring that the arc hole 56 can enter the feeding area under the drive of the moving tube 51 during the up and down reciprocating motion of the moving tube 51, thereby realizing normal and continuous feeding of the modified polypropylene.

[0041] See also Figure 2 The lower end surfaces of the discharge hole 42 and the drop hole 53 are both inclined surfaces, which are contact surfaces when adding raw materials. The inclined surface design can ensure that no raw material residue is left at the end surface of the contact surface, reduce the waste of raw materials, and also avoid residual materials affecting the quantitative addition.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A feeding device for MPP pipe production, comprising a fixed plate (1), a screw feeder (2) and an outer shell (3), characterized in that: The fixing plate (1) is fixedly mounted on the working ground by means of expansion bolts; a spiral feeder (2) is fixedly mounted on the top of the fixing plate (1); an outer shell (3) is mounted at the feeding port of the spiral feeder (2); an annular sleeve (4) is mounted on the top of the outer shell (3); a discharge chamber is formed between the annular sleeve (4) and the inner wall of the outer shell (3); a plug hole (41) is provided at the center of the outer side of the annular sleeve (4); and a discharge hole is provided at the lower part of the inner side of the annular sleeve (4). (42), a horizontal plate (43) is fixedly installed on the top of the plug hole (41), circular holes (44) are opened at equal intervals in the circumferential direction inside the horizontal plate (43), a rectangular hole (45) is opened at the center of the horizontal plate (43), an annular baffle (46) is fixedly installed on the top of the horizontal plate (43) and located between the circular hole (44) and the rectangular hole (45), a feeding part (5) is installed inside the plug hole (41), and a driving assembly (6) is connected to the top of the feeding part (5); The material adding part (5) comprises a moving tube (51) vertically plugged into the inner wall of the plug hole (41); a conical groove (52) is provided inside the moving tube (51); a material dropping hole (53) is provided on the outer wall of the moving tube (51); and the material dropping hole (53) is communicated with the bottom of the conical groove (52); leakage holes (54) are provided at equal intervals in the circumferential direction on the top of the moving tube (51); and the leakage holes (54) are communicated with the top of the conical groove (52); and a plurality of sleeves (55) are fixedly mounted on the top of the moving tube (51); and a circular arc hole (56) is provided at a lower position on the outer side of each sleeve (55); and each sleeve (55) is plugged into the circular hole (44); The top end surface of the annular sleeve (4) is a conical surface. A circular groove (47) is provided at the connection between the top conical surface of the annular sleeve (4) and the horizontal plate (43). A sealing ring (40) is placed in the circular groove (47). A plurality of material storage grooves (48) are provided at equal intervals in the circumferential direction at the bottom of the circular groove (47). A material discharge port (49) is provided at the bottom of each material storage groove (48). A material feeding area is formed between the top conical surface of the annular sleeve (4), the sealing ring (40), the horizontal plate (43), the sleeve (55) and the annular baffle (46). A push rod (511) is fixedly installed at a central position of the bottom of the moving tube (51), support rods (512) are evenly installed at the outer wall of the bottom of the push rod (511), and fixed brackets (513) are fixedly connected at the end faces of a plurality of the support rods (512), and an isolation ring block (514) is installed at the top position of the fixed bracket (513), and cross bars (515) are welded to the inner wall of the isolation ring block (514) at equal intervals in the circumferential direction, and a circular arc baffle (516) is fixedly installed at the end of each cross bar (515); The driving assembly (6) comprises a driving motor (61) mounted at a position above the outer shell (3) via a fixing frame, the output end of the driving motor (61) is connected to a driving disc (62) via a driving shaft, a driving arm (63) is mounted inside the driving disc (62) via an eccentric rod, the bottom of the driving arm (63) is connected to a shaft seat (64), the shaft seat (64) is fixedly mounted at a top center position of the moving tube (51), and the driving arm (63) is located in the rectangular hole (45); An annular groove (491) is provided on the inner wall of the plug hole (41), and the annular groove (491) and the discharge port (49) are communicated with each other. A slide groove (494) is provided at the bottom of the discharge port (49). A limit slider (495) is installed in the slide groove (494). A tension spring (496) is installed between the limit slider (495) and the inner wall of the slide groove (494). A quantitative plate (492) is installed on the top of the limit slider (495). The quantitative plate (492) is plugged into the discharge port (49). A quantitative hole (493) is provided in the quantitative plate (492). An extrusion ring (497) is welded on the outer wall of the moving tube (51) and in the area of ​​the annular groove (491). The cross section of the extrusion ring (497) is a trapezoidal surface. An extended ring block (5141) is installed at the bottom of the isolation ring block (514), the inner wall of the extended ring block (5141) is in close contact with the bottom outer wall of the annular sleeve (4), and when the eccentric rod is at the lowest point, the lower end surface of the extended ring block (5141) is located below the bottom of the annular sleeve (4), and when the eccentric rod is at the highest point, the lower end surface of the extended ring block (5141) is located in the discharge chamber.

2. A feeding device for MPP pipe production according to claim 1, characterized in that The inner wall of the isolation ring block (514) is welded with path rods (5142) at equal intervals, and the path rods (5142) in different horizontal planes are arranged in a staggered manner.

3. A feeding device for MPP pipe production according to claim 1, characterized in that , the plurality of quantitative holes (493) include at least two different sizes, and the quantitative holes (493) of the same size are distributed at equal intervals in the circumferential direction.

4. A feeding device for MPP pipe production according to claim 1, characterized in that: When the eccentric rod is located at the lowest point, the horizontal height of the upper end surface of the sleeve (55) is higher than the horizontal height of the upper end surface of the horizontal plate (43).

5. The feeding device for MPP pipe production according to claim 1, characterized in that: When the eccentric rod is located at the highest point, the horizontal height of the lower edge of the circular arc hole (56) is higher than the horizontal height of the lower end surface of the horizontal plate (43).

6. A feeding device for MPP pipe production according to claim 1, characterized in that: The lower end surfaces of the discharge hole (42) and the drop hole (53) are both inclined surfaces.

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