An injection molding machine

Abstract

The present invention discloses an injection molding machine, comprising a connecting rod assembly disposed between the tail plate and the second plate. The connecting rod assembly comprises a rear hook hinge, a first hinge rod, a second hinge rod, and a crosshead. The piston rod of the first oil cylinder is fixed with the crosshead. One end of the rear hook hinge is hinged to the tail plate, and the other end is hinged to the first hinge rod. The first hinge rod is hinged to the second hinge rod and the second plate, respectively. The crosshead is located between the second hinge rods, and each end of the crosshead is movably connected to the second hinge rod. When the first oil rod pushes forward, the crosshead moves forward, and the second hinge rod also moves forward, pushing the rear hook hinge and the long rod forward. This in turn pushes the second plate against the head plate, gradually increasing the pressure in the mold cavity formed by the mold, offsetting the back pressure on the mold when the material is injected into the mold cavity, and ensuring that the plastic in the mold cavity is properly formed. When the first oil rod retracts, the crosshead drives the second hinge rod backward, causing the first hinge rod and the rear hook hinge to bend, generating a strong pulling force that pulls the second plate toward the tail plate, ensuring that the mold on the tail plate and the second plate are separated. This arrangement is suitable for large-scale and heavy-duty molds and has good practicality.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding machines, and in particular relates to an injection molding machine. Background Art

[0002] An injection molding machine is a mechanical device that uses molding tools to make plastic products of various shapes. One of the most important parts of an injection molding machine is the clamping device, which includes a head plate, a second plate, and a tail plate. The second plate can be moved to merge the mold fixed on the second plate with the mold on the tail plate. In the prior art, different molds need to be fixed on the second plate and the tail plate according to different products, and the weight of molds of different specifications affects the thrust, which is also related to the degree of clamping of the second plate and the tail plate. The drive device for clamping the mold in the prior art includes a screw drive structure through a conveyor belt, and there is also a patent document with the publication number CN115107219A, which is titled "A High-Efficiency Intermittent Multi-Rule Plastic Injection Molding Machine," "Ejection Mechanism 5 Package The present invention also provides an injection molding machine according to the present invention, which comprises a fixed mold 51 arranged on a shift slide 42, a movable mold 52 arranged between the shift slide 42 and the fixed mold 51, and a demolding assembly 6 arranged on the mounting bracket 11, which is used to drive the movable mold 52 to shift, thereby completing the mold closing and demolding work. The demolding assembly includes an oil cylinder arranged on the mounting bracket... The oil cylinder can drive the shift rack and the movable mold to shift. Although the oil cylinder can meet the existing needs of mold closing and locking of the injection molding machine, the better the clamping degree during mold closing, the better the effect of the product produced. At the same time, the greater the thrust of the oil cylinder, the less restriction on the production of the product. Therefore, the present invention proposes an injection molding machine. Summary of the Invention

[0003] The purpose of the present invention is to solve the above-mentioned technical problems existing in the prior art and to provide an injection molding machine. By adding a connecting rod assembly between the second plate and the tail plate, the clamping force and separation force of the heavy mold are improved, the molding effect of the product is ensured, and the quality of the product is indirectly improved.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] An injection molding machine comprises: a clamping part, an injection part and a feeding part, wherein the material is injected into the injection part through the feeding part, and the injection part injects the molten material into the clamping part; the clamping part comprises a head plate, a second plate and a tail plate, and the tail plate is provided with a first oil cylinder to push the second plate; the machine is characterized in that: a connecting rod assembly is provided between the tail plate and the second plate, the connecting rod assembly comprises a rear hook hinge, a first hinge rod, a second hinge rod and a crosshead, the piston rod of the first oil cylinder is fixed with a crosshead, one end of the rear hook hinge is hinged to the tail plate, and the other end is hinged to the first hinge rod, the second hinge rod and the second plate are hinged to the first hinge rod respectively, the crosshead is between the second hinge rods, and the two ends of the crosshead are movably connected to the second hinge rod respectively.

[0006] Furthermore, a plurality of slots are provided at intervals on both sides of the first hinge rod, and a plurality of slotted blocks are provided at intervals on the second plate. When the second plate is hinged at one side of the slot, the slotted block is embedded in the slot.

[0007] Furthermore, the two plates are provided with a pushing assembly, which includes a first rod body and a pushing plate, and a fixing part is provided on the pushing plate, which includes a first fixing plate and a second fixing plate, the first fixing plate is provided with a groove, and the second fixing plate is restricted to movement in the groove, the first fixing plate is provided with a first fixing hole, and the second fixing plate is provided with a second fixing hole, one end of the second fixing hole is larger than the other end, the maximum diameter of the second rod body is between the aperture lengths at both ends of the first fixing hole, and the first rod body is provided with a radially recessed circumferential groove.

[0008] Furthermore, the injection part includes a nozzle assembly, a barrel and a screw assembly. The screw assembly includes a screw, which is arranged in the barrel. The screw coupling is connected to the second rotary motor. The second rotary motor is provided with a push cylinder to push the second rotary motor. A plurality of screw grooves are formed between the threads on the screw and the barrel. The screw grooves gradually transition from deep to shallow in the direction of the feed part toward the nozzle assembly.

[0009] Furthermore, the nozzle assembly includes a nozzle head, the inner cavity of the nozzle head is connected to the inner cavity of the barrel, and the outer portion of the nozzle head is provided with a first heating coil.

[0010] Furthermore, the feeding part includes a hopper, a hopper mounting plate and a hopper support plate. The hopper is arranged on the hopper mounting plate. The hopper support plate is provided with a discharge port and a material guide port corresponding to the discharge port of the hopper respectively. The injection part is provided with a feed port, and the material guide port passes through the feed port. The hopper mounting plate is slidably connected to the hopper support plate. The hopper mounting plate is provided with a material passing port. A locking piece is connected to the hopper mounting plate, and the locking piece limits the free sliding of the hopper mounting plate.

[0011] Furthermore, a shooting platform bracket is provided between the feeding part and the injection part, and the shooting platform bracket is provided with a shooting cylinder.

[0012] Furthermore, a first limiting cavity and a second limiting cavity are provided on the shooting platform bracket. The first limiting cavity passes through the first opening and the second opening which are perpendicular to each other. The barrel is embedded in the first limiting cavity through the first opening, so that the feed port of the barrel corresponds to the second opening, the feed part is fixed at the second opening, the second opening corresponds to the discharge port of the feed part, and the push cylinder is fixed in the second limiting cavity.

[0013] Furthermore, it also includes a frame, which is provided with an upper cavity and a lower cavity, the upper cavity and the lower cavity are connected, the material locking part is provided in the upper cavity, and a drop hopper is provided in the lower cavity, and the drop hopper is placed below the second plate and the head plate.

[0014] Furthermore, the feeding part and the injection part are provided with sliding blocks, and a sliding assembly is provided under the sliding block. The sliding assembly includes an annular plate, which is hollow and has parallel slide rails on both sides, so that the feeding part and the injection part are horizontally mounted above the hollow annular plate, and the sliding block is limited on the slide rail for sliding.

[0015] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0016] The present invention provides a connecting rod assembly between the tail plate and the second plate for linkage, and the first oil cylinder amplifies the thrust by pushing the connecting rod assembly. The connecting rod assembly includes a rear hook hinge, a first hinge rod, a second hinge rod and a crosshead. The piston rod of the first oil cylinder is fixed with a crosshead. One end of the rear hook hinge is hinged to the tail plate, and the other end is hinged to the first hinge rod. The second hinge rod and the second plate are hinged to the first hinge rod respectively. The crosshead is between the second hinge rod, and the two ends of the crosshead are movably connected to the second hinge rod. When the first oil rod pushes, the crosshead moves forward, and the second hinge rod also moves forward accordingly, pushing the rear hook hinge and the length forward, thereby pushing the two plates to squeeze the head plate, gradually increasing the pressure of the mold cavity formed by the mold, offsetting the back pressure on the mold when the material is injected into the mold cavity, and ensuring that the plastic in the mold cavity is well formed. When the first hinge rod and the rear hook hinge are flattened, the two plates move to the maximum distance from the tail plate, that is, the maximum thrust is achieved. When the first oil boom retracts, the crosshead drives the second hinge rod backward, bending the first hinge rod and the rear hook hinge. This generates a strong pulling force that pulls the second plate toward the tail plate, ensuring that the mold on the second plate and the tail plate are separated. This setting can accommodate large and heavy molds, ensuring the clamping and separation force between the molds. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a side view of the clamping part of the present invention;

[0020] Figure 3 Schematic diagram of the partial structure of the clamping part of the present invention (1);

[0021] Figure 4 Schematic diagram of the structure of the injection part of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the shooting platform support in the present invention;

[0023] Figure 6 Schematic diagram of the internal structure of the injection part of the present invention;

[0024] Figure 7 Schematic diagram of the structure of the feeding part of the present invention;

[0025] Figure 8 This is a schematic structural diagram of the hopper mounting plate in the present invention;

[0026] Figure 9 Schematic diagram of the structure of the first rod and the fixing member in the present invention;

[0027] Figure 10 for Figure 6 Enlarged view of point B in the middle;

[0028] Figure 11 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 12 Schematic diagram of the partial structure of the clamping part of the present invention (II);

[0030] Figure 13 Schematic diagram of the local structure of the clamping part in the present invention (3).

[0031] In the figure, 1-feeding part; 2-injection part; 3-clamping part; 4-frame; 5-drop hopper; 6-electrical box; 7-controller; 8-head plate; 9-second plate; 10-tail plate; 11-connecting rod assembly; 12-pushing assembly; 13-first oil cylinder; 14-second gear; 15-pull rod; 16-rear hook hinge; 17-first hinge rod; 18-second hinge rod; 19-crosshead; 20-second rotary motor; 21-annular plate; 22-slide rail; 23-shooting platform bracket; 24-shooting cylinder; 25-second heating coil; 26-first heating coil; 27-nozzle head; 28-first limiting cavity; 29-second limiting cavity; 30-first opening; 31-hopper; 32-hopper mounting plate; 33-hopper support plate; 34-baffle; 35-feeding port; 36-locating pin; 37-discharge port; 38-locating notch; 39-feeding port; 40-fixing piece; 41-barrel; 42-first rod body; 43-circumferential groove; 44-first fixing plate; 45-first fixing hole; 46-groove; 47-second fixing plate; 48-second fixing hole; 49-second opening; 50-screw groove; 51-second oil cylinder; 52-push plate; 53-second rod body; 54-limiting groove; 55-first rotary motor; 56-first gear; 57-slot; 58-embedded block; 59-locking piece; 60-screw; 61-feeding port. DETAILED DESCRIPTION

[0032] like Figures 1 to 13As shown, an injection molding machine of the present invention includes: a clamping part 3, an injection part 2 and a feeding part 1, the material is injected into the injection part 2 through the feeding part 1, and the injection part 2 injects the molten material into the clamping part 3; the clamping part 3 includes a head plate 8, a second plate 9 and a tail plate 10, and the tail plate 10 is provided with a first oil cylinder 13 to push the second plate 9; a connecting rod assembly 11 is provided between the tail plate 10 and the second plate 9, and the connecting rod assembly 11 includes a rear hook hinge 16, a first hinge rod 17, a second hinge rod 18 and a crosshead 19, and the piston rod of the first oil cylinder 13 is fixed with the crosshead 19, one end of the rear hook hinge 16 is hinged to the tail plate 10, and the other end is hinged to the first hinge rod 17, the second hinge rod 18 and the second plate 9 are hinged on the first hinge rod 17 respectively, the crosshead 19 is between the second hinge rod 18, and the two ends of the crosshead 19 are movably connected to the second hinge rod 18. By setting up this connecting rod structure, the conveyor belt structure in the prior art is eliminated, and the thrust of the cylinder is directly used as the driving force of the second plate 9, thereby improving the force conversion. At the same time, the connecting rod assembly 11 can increase the clamping force of the second plate 9 and the tail plate 10, amplifying the thrust of the first cylinder 13, and solving the technical problem of the present invention.

[0033] Taking into account that the greater the thrust, the easier it is for the connecting rod assembly 11 to deform, a number of spaced slots 57 are provided on both sides of the first hinge rod 17, and a number of spaced-apart locking blocks 58 are provided on the second plate 9. When the second plate 9 is hinged to one side of the slot 57, the locking block 58 is embedded in the slot 57, so that the first hinge rod 17 and the locking block 58 are connected at intervals, thereby strengthening the hinge strength of the first hinge rod 17 and the second plate 9. The slot 57 on the other side of the first hinge rod 17 is also connected to the rear hook hinge 16 in the same way, thereby improving the overall strength of the connecting rod assembly 11.

[0034] The second plate 9 is provided with a push assembly 12, which includes a second oil cylinder 51 and a push plate 52. The second oil cylinder 51 acts on the push plate 52, which is provided with a push rod. The second oil cylinder 51 helps the push rod to extend and retract by pushing the push plate 52. The push rod includes a first rod body 42 and a second rod body 53. The push plate 52 is provided with a fixing member 40, which includes a first fixing plate 44 and a second fixing plate 47. The first fixing plate 44 is provided with a groove 46, and the second fixing plate 47 is restricted in movement within the groove 46. The first fixing plate 44 is provided with a first fixing hole 45, and the second fixing plate 47 is provided with a second fixing hole 48. One end of the second fixing hole 48 is larger than the other end. The maximum diameter of the second rod body 53 is between the lengths of the two ends of the first fixing hole 45. The first rod body 42 is provided with a radially recessed circumferential groove 43. When fixing, the larger end of the second fixing hole 48 is first aligned with the first fixing hole 45. After the end of the first rod body 42 passes through the first fixing hole 45 and the second fixing hole 48, the second fixing plate 47 slides downward along the groove 46, so that the plate edge of the smaller end of the second fixing hole 48 is embedded in the circumferential groove 43, so that the second fixing plate 44 blocks the first fixing hole 45, thereby limiting the first rod body 42 in the first fixing hole 45.

[0035] The second plate 9 is provided with a limiting groove 54, and the push plate 52 and the push rod move in the limiting groove 54. A through hole is provided on the side wall of one side of the limiting groove 54, and the through hole and the limiting groove 54 are connected. The side wall on the other side is used to fix the second oil cylinder 51, so that the second oil cylinder 51 is stably fixed, and it also helps to guide the movement of the push plate 52 and the push rod.

[0036] Four pull rods 15 are fixed to the four corners of the head plate 8, and the tail plate 10 and the second plate 9 are threadedly connected to the pull rods 15. The tail plate 10 is provided with a first gear 56 and a first rotating motor 55. The pull rod 15 is provided with a second gear 14. The first rotating motor 55 is provided with a third gear on the rotating shaft. The first gear 56 is respectively engaged with the second gear 14 and the third gear. When the first rotating motor 55 rotates, the third gear drives the first gear 56 to rotate, and the first gear 56 drives the second gear 14 to rotate. When the second gear 14 rotates, that is, when the pull rod 15 rotates, the tail plate 10 and the second plate 9 can move along the pull rod 15 to adjust the distance between the second plate 9 and the head plate 8. This setting can adjust the distance according to the thickness of different molds.

[0037] The injection unit 2 includes a nozzle assembly, a barrel 41, and a screw 60 assembly. The screw 60 assembly includes a screw 60, which is disposed within the barrel 41 and is coupled to a second rotary motor 20. The second rotary motor 20 is provided with a push cylinder to push the second rotary motor 20. A plurality of screw grooves 50 are formed between the threads on the screw 60 and the barrel 41. The screw grooves 50 gradually transition from deep to shallow in the direction from the feed unit 1 toward the nozzle assembly. Compared with the prior art, the screw 60 can push while rotating within the barrel 41, uniformly heating the raw material and accelerating the melting rate. The raw material is ground from the deep screw grooves 50 to the shallow screw grooves 50, reducing the particles of the liquid raw material and increasing the fineness of the liquid raw material, which is beneficial to improving the quality of the melt.

[0038] Several second heating coils 25 are arranged in a close-fitting manner on the outside of the barrel 41 to melt the material inside the barrel 41. The nozzle assembly includes a nozzle head 27, the inner cavity of which is connected to the inner cavity of the barrel 41. The nozzle head 27 is covered with a first heating coil 26 to prevent the liquid raw material from prematurely cooling and solidifying before being conveyed into the clamping unit 3. The solidified raw material adheres to the nozzle head 27 and affects the subsequent conveying of the liquid raw material.

[0039] The feeding section 1 includes a hopper 31, a hopper mounting plate 32, and a hopper support plate 33. The hopper 31 is mounted on the hopper mounting plate 32. The hopper support plate 33 is provided with a discharge port 37 and a material guide port corresponding to the discharge port of the hopper 31. The injection section 2 is provided with a feed port 61. The material guide port passes through the feed port 61. The hopper mounting plate 32 is slidably connected to the hopper support plate 33. The hopper mounting plate 32 is provided with a material passage 39. The hopper mounting plate 32 is connected to a locking member 59, which restricts the free sliding of the hopper mounting plate 32. The locking member 59 is connected to the hopper mounting plate 32. The locking member 59 adopts a handwheel screw 60. The handwheel screw 60 passes through the hopper mounting plate 32 and contacts the hopper support plate 33, resulting in a large friction force, thereby restricting the free sliding of the hopper mounting plate 32. Locating pins 36 are provided near the material guide port and the material discharge port 37, and a positioning notch 38 matching the positioning pin 36 is provided on the hopper mounting plate 32. When a positioning pin 36 rests against the inner wall of a positioning notch 38, the material outlet 39 is opposite to the material port close to the positioning pin 36, which facilitates material guiding or discharging.

[0040] A slide is formed between the fixed plate and the hopper mounting plate 32, and a baffle 34 is slidably connected in the slide. The baffle 34 is provided with a drop opening 35 corresponding to the discharge port and the feed opening 39 of the hopper 31. When the drop opening 35 is opposite to the discharge port of the hopper 31, the material in the hopper 31 can be discharged through the drop opening 35 and the feed opening 39 in sequence. When the drop opening 35 is staggered with the discharge port of the hopper 31, the baffle 34 blocks the discharge port of the hopper 31, thereby flexibly controlling the discharge amount of the material, and the operation is simple and convenient

[0041] A shooting platform bracket 23 is provided between the feed section 1 and the injection section 2. The shooting platform bracket 23 is equipped with a shot displacement cylinder 24. A first limiting cavity 28 and a second limiting cavity 29 are provided on the shooting platform bracket 23. The first limiting cavity 28 extends through a first opening 30 and a second opening 49, which are perpendicular to each other. The barrel 41 is inserted into the first limiting cavity 28 through the first opening 30, so that the feed port 61 of the barrel 41 corresponds to the second opening 49. The feed section 1 is fixed to the second opening 49, which corresponds to the discharge port of the feed section 1. A thrust cylinder is fixed in the second limiting cavity 29. The feed section 1 and the injection section 2 are stably connected together by the shooting platform bracket 23, which also facilitates the shot displacement cylinder 24 to move the feed section 1 and the injection section 2 as a whole to adjust the distance between the nozzle head 27 of the injection section 2 and the head plate 8.

[0042] The present invention further comprises a frame 4, which is provided with an upper cavity and a lower cavity, the upper and lower cavities being interconnected. The material locking portion is disposed in the upper cavity, and a drop hopper 315 is disposed in the lower cavity. Drop hopper 315 is positioned below the second plate 9 and the head plate 8. The provision of frame 4 acts as a protective shield for the mold locking portion 3, thereby improving production safety. Once the molded product is released, it falls into drop hopper 315, making it very easy to collect.

[0043] The feed section 1 and the injection section 2 are provided with sliding blocks, and a sliding assembly is provided below the sliding blocks. The sliding assembly includes an annular plate 21. The annular plate 21 is hollow and has two parallel slide rails 22 on both sides. The feed section 1 and the injection section 2 are horizontally mounted above the hollow annular plate 21, and the sliding blocks are limited to slide on the slide rails 22. A reinforcement plate is also provided inside the annular plate 21 to improve the structural strength of the annular plate 21. The annular plate 21 allows the feed section 1 and the injection section 2 mounted on the annular plate 21 to be suspended in the air, improving the heat dissipation effect.

[0044] The present invention is further provided with a controller 7 and an electrical box 6 to control the coordinated movement of the feeding part 1, the injection part 2 and the clamping part 3. This control method is a prior art and will not be elaborated in detail in the present invention.

[0045] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all included in the scope of protection of the present invention.

Claims

1. An injection molding machine comprising: A clamping part, an injection part and a feeding part, wherein the material is injected into the injection part through the feeding part, and the injection part injects the molten material into the clamping part; The clamping part includes a head plate, a second plate, and a tail plate, and the tail plate is provided with a first oil cylinder for pushing the two plates; the characterizing feature is that a connecting rod assembly is provided between the tail plate and the second plates, the connecting rod assembly including a rear hook hinge, a first hinge rod, a second hinge rod, and a crosshead, the piston rod of the first oil cylinder is fixed with a crosshead, one end of the rear hook hinge is hinged to the tail plate, and the other end is hinged to the first hinge rod, the second hinge rod and the two plates are hinged to the first hinge rod, the crosshead is located between the second hinge rods, and both ends of the crosshead are movably connected to the second hinge rod; A plurality of slots are provided at intervals on both sides of the first hinge rod, and a plurality of slotted blocks are provided at intervals on the second plate. When the second plate is hinged to one side of the slot, the slotted blocks are embedded in the slot; The two plates are provided with a pushing assembly, which includes a first rod body, a second rod body and a pushing plate, and a fixing piece is provided on the pushing plate, and the fixing piece includes a first fixing plate and a second fixing plate, the first fixing plate is provided with a groove, and the second fixing plate is restricted to move in the groove, the first fixing plate is provided with a first fixing hole, and the second fixing plate is provided with a second fixing hole, one end of the second fixing hole is larger than the other end, the maximum diameter of the second rod body is between the aperture lengths at both ends of the first fixing hole, and the first rod body is provided with a radially recessed circumferential groove.

2. The injection molding machine according to claim 1, characterized in that: The injection part includes a nozzle assembly, a barrel and a screw assembly. The screw assembly includes a screw, which is arranged in the barrel. The screw coupling is connected to a second rotary motor. The second rotary motor is provided with a push cylinder to push the second rotary motor. A plurality of screw grooves are formed between the threads on the screw and the barrel. The screw grooves gradually transition from deep to shallow in the direction from the feed part toward the nozzle assembly.

3. The injection molding machine according to claim 2, characterized in that: The nozzle assembly comprises a nozzle head, the inner cavity of the nozzle head is connected to the inner cavity of the barrel, and the outer portion of the nozzle head is provided with a first heating coil.

4. The injection molding machine according to claim 1, characterized in that: The feeding part includes a hopper, a hopper mounting plate and a hopper support plate. The hopper is arranged on the hopper mounting plate. The hopper support plate is provided with a discharge port and a material guide port corresponding to the discharge port of the hopper respectively. The injection part is provided with a feeding port, and the material guide port passes through the feeding port. The hopper mounting plate is slidably connected to the hopper support plate. The hopper mounting plate is provided with a material passing port. A locking piece is connected to the hopper mounting plate, and the locking piece limits the free sliding of the hopper mounting plate.

5. The injection molding machine according to claim 2, characterized in that: A shooting platform bracket is provided between the feeding part and the injection part, and the shooting platform bracket is provided with a shooting cylinder.

6. The injection molding machine according to claim 5, characterized in that: The shooting platform bracket is provided with a first limiting cavity and a second limiting cavity, the first limiting cavity passes through the first opening and the second opening which are perpendicular to each other, the barrel is embedded in the first limiting cavity through the first opening, so that the feed port of the barrel corresponds to the second opening, the feed part is fixed at the second opening, the second opening corresponds to the discharge port of the feed part, and the push cylinder is fixed in the second limiting cavity.

7. The injection molding machine according to claim 1, characterized in that: Also includes: The frame is provided with an upper cavity and a lower cavity, the upper cavity and the lower cavity are connected, the locking part is arranged in the upper cavity, and a drop hopper is arranged in the lower cavity, and the drop hopper is placed below the second plate and the head plate.

8. The injection molding machine according to claim 1, characterized in that: The feeding part and the injection part are provided with a sliding block, and a sliding assembly is provided under the sliding block. The sliding assembly includes an annular plate, which is hollow. The annular plate is provided with sliding rails parallel to both sides, so that the feeding part and the injection part are horizontally mounted above the hollow annular plate, and the sliding block is limited to slide on the sliding rail.

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