A double-screw single-plunger special machine

Abstract

The utility model discloses a double-screw single-plunger special machine, including a mold locking unit and an injection unit, wherein the injection unit is connected to the mold locking unit through two sets of shooting cylinder guide column assemblies, and the injection unit includes a transmission assembly, a double-screw assembly and a plunger assembly arranged in a triangular structure, wherein the shooting cylinder guide column assembly and the double-screw assembly form a balanced force structure, and the plunger assembly is arranged inside the shooting cylinder guide column assembly and the double-screw assembly to form a balanced injection structure. The double-screw single-plunger special machine has more stable power transmission and higher strength, good double-screw structure stability, higher pressurization accuracy, and the plunger assembly forms a balanced injection structure during the injection process. The double-screw guide column assembly guides the plunger assembly, and the double-screw assembly transmits force, and the force is evenly applied, so that the plunger assembly will not be offset or unevenly stressed during the injection process, thereby greatly improving the quality of the product.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a double-screw single-plunger special machine. Background Art

[0002] The single-plunger injection molding machine with screw drive has the following problems during use: low overall structural strength, poor injection process stability, low pressurization accuracy, and short service life. At the same time, during the injection process, the plunger rod will deviate and be unevenly stressed, resulting in poor quality of the injection molded products.

[0003] Therefore, it is urgent to design a double-screw single-plunger special machine that can improve the structural strength and pressurization accuracy of the overall injection molding machine, while extending its service life. During the injection molding process, the plunger head will not be offset, the force will be evenly applied, and the injection molding product quality will be high. Utility Model Content

[0004] The purpose of the utility model is to solve the problems of the existing single-screw transmission single-plunger injection molding machine, such as low overall structural strength, poor injection process stability, low pressurization accuracy, short service life, and the plunger rod will deviate and be unevenly stressed during the injection process, resulting in poor quality of injection molded products. A double-screw single-plunger special machine is provided, which can effectively improve the structural strength and pressurization accuracy of the overall injection molding machine and extend the service life. During the injection molding process, the plunger head will not deviate, the force is evenly applied, and the injection molded product quality is high.

[0005] The technical solution adopted by the utility model to achieve the purpose of the invention is: a double-screw single-plunger special machine, including a clamping unit and an injection unit, the injection unit is connected to the clamping unit through two groups of shooting cylinder guide column assemblies, the injection unit includes a transmission assembly, a double-screw assembly and a plunger assembly arranged in a triangular structure, the shooting cylinder guide column assembly and the double-screw assembly form a balanced force structure, and the plunger assembly is arranged on the inner side of the shooting cylinder guide column assembly and the double-screw assembly to form a balanced injection structure. The double-screw single-plunger special machine has a new design for the transmission component in the injection unit, and sets the transmission component in a triangular structure, so that the power transmission is more stable and has higher strength. At the same time, the double-screw component is designed to transmit force. The double-screw component is evenly stressed and pressurized, which not only prolongs the life of the screw but also improves the injection precision. During the injection process, the double-screw structure is more stable and the pressurization precision is higher. In addition, a balanced force structure is formed on the outside of the plunger component by the double-screw component and the double-shot cylinder guide column component, so that the plunger component forms a balanced injection structure during the injection process. The double-shot cylinder guide column component guides the plunger component, and the double-screw component transmits force, so that the plunger component will not be offset or unevenly stressed during the injection process, which greatly improves the quality of the product.

[0006] Preferably, the clamping unit comprises a cylinder lower template, a lower template and an upper template, wherein the upper template is connected to the cylinder lower template through a set of mold cylinder machine columns, and the lower template is arranged in the middle of the mold cylinder machine columns; a mold cylinder assembly and a quick cylinder assembly are arranged between the cylinder lower template and the lower template. The clamping unit is mainly used to realize the clamping and mold opening operation, so a mold cylinder assembly and a quick cylinder assembly are arranged between the cylinder lower template and the lower template.

[0007] Preferably, the injection unit is mounted on the upper mold plate of the clamping unit; a limit rod is provided on the upper mold plate. The injection unit is mounted on the upper mold plate to realize the integrated design of the injection unit and the clamping unit, making the overall structure more compact and stable. The limit rod is provided to limit the injection process of the plunger assembly. The limit rod can limit the downward limit position of the upper mold plate to ensure the injection stroke of the plunger assembly.

[0008] Preferably, the injection unit further comprises an upper template for connecting the plunger assembly and driving the plunger assembly to move up and down, and a synchronous belt fixing plate for installing the transmission assembly. The upper template is provided to realize the installation of the plunger assembly and to drive the upper template to move up and down through the double screw assembly to realize the up and down movement of the plunger assembly, thereby realizing the injection function. The synchronous belt fixing plate is provided to facilitate the installation of the transmission assembly and to facilitate the transmission assembly to form a triangular structure and a stable force-bearing structure.

[0009] Preferably, each group of shooting cylinder guide pin assemblies includes a shooting cylinder guide pin and a guide sleeve, wherein the lower end of the shooting cylinder guide pin is connected to the upper template via the guide sleeve, and the upper end of the shooting cylinder guide pin is connected to the synchronous belt fixing plate. First, the shooting cylinder guide pin is used to realize the guiding function, so the upper end of the shooting cylinder guide pin is connected to the synchronous belt fixing plate and the lower end is connected to the upper template, so that the upper template can move up and down along the shooting cylinder guide pin, thereby driving the plunger assembly to move up and down. Second, the shooting cylinder guide pin and the double screw rod form a stable force-bearing structure, which is convenient for the transmission setting of the double screw rod.

[0010] Preferably, the double-screw assembly includes two ball screws arranged vertically and parallel to each other, and the two ball screws are arranged along a diagonal line of the synchronous belt fixing plate; the two shooting cylinder guide pillars are arranged along the other diagonal line of the synchronous belt fixing plate. The two ball screws and the two shooting cylinder guide pillars are respectively arranged on the two diagonals of the synchronous belt fixing plate, which not only simplifies the structure of the whole machine and forms a stable balanced force structure, but also facilitates the internal installation of the plunger assembly, improves the pressurization accuracy, and the plunger assembly injection process will not have the phenomenon of offset and uneven force. Of course, this structure is for the case where the synchronous belt fixing plate is arranged in a roughly square structure. If the synchronous belt fixing plate is arranged in a circular or other shape as a whole, the two ball screws and the two shooting cylinder guide pillars can be arranged along two perpendicularly intersecting diameters or arranged in staggered positions around the plunger assembly, thereby forming a balanced force structure.

[0011] Preferably, the two ball screws and the two cylinder guide pins form the balanced force structure between the synchronous belt fixing plate and the upper mold plate, and the balanced injection structure is formed between the balanced force structure and the plunger assembly. The balanced force structure makes the structure more stable, and the injection accuracy and pressurization accuracy are higher. The formation of the balanced injection structure makes the plunger assembly have good guiding performance and uniform force during the injection process, and will not cause deviation, uneven force and other phenomena, which can greatly improve the quality of injection products.

[0012] Preferably, the plunger assembly includes a weighing sensor, a plunger connecting rod and a plunger head. The weighing sensor is fixed to the lower plate surface of the upper mold plate through a sensor fixing plate. The upper end of the plunger connecting rod is fixedly connected to the sensor fixing plate through a plunger flange. The plunger head is fixed to the lower end of the plunger connecting rod for product injection. The weighing sensor is set in the plunger assembly to weigh the injection plastic and achieve precise injection, and the above structure of the plunger assembly is to achieve stable pressurized injection.

[0013] Preferably, the transmission assembly comprises an injection driving wheel driven by an injection motor, an injection driven wheel assembly arranged on a double screw assembly, and a synchronous belt wound around the injection driving wheel and the injection driven wheel assembly. Preferably, the transmission assembly is driven by an injection motor and is driven by a synchronous belt. A stable transmission mechanism of a triangular structure is formed by the injection driving wheel arranged on the output shaft of the injection motor and the injection driven wheel arranged on the ball screw, which effectively improves the strength of the overall structure.

[0014] Preferably, the output shaft of the injection motor is vertically arranged upward, and the output shaft of the injection motor is arranged in parallel with the double screw assembly in a triangular structure, and the injection driving wheel and the injection driven wheel assembly are arranged at three points. The three-point arrangement forms a triangular stable structure with good strength and stability.

[0015] The beneficial effects of the utility model are as follows: the transmission assembly of the double-screw single-plunger special machine is arranged in a triangular structure, so that the power transmission is more stable and the strength is higher, the double-screw structure has good stability, and the pressurization accuracy is higher. During the injection process, the plunger assembly forms a balanced injection structure, the double-cylinder guide column assembly guides the plunger assembly, and the double-screw assembly transmits force, and the force is evenly applied, so that the plunger assembly will not deviate or be unevenly stressed during the injection process, thereby greatly improving the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural schematic diagram of some components of a double-screw single-plunger special machine.

[0017] FIG. 2 is a structural schematic diagram of some components of the double-screw single-plunger special machine of the utility model from another angle.

[0018] Figure 3 It is a structural schematic diagram of the injection unit in the utility model.

[0019] Figure 4 It is a cross-sectional view of the injection unit in the utility model.

[0020] FIG. 5 is a schematic structural diagram of the complete double-screw single-plunger special machine of the utility model.

[0021] In the figure: 1. rack assembly, 2. electric control box assembly, 3. operation box assembly;

[0022] 4. Clamping unit, 41. Cylinder lower template, 42. Cylinder assembly, 42-1. Cylinder sleeve, 42-2. Cylinder mandrel, 43. Lower template, 44. Quick cylinder assembly, 44-1. Quick cylinder sleeve, 44-2. Quick cylinder mandrel, 44-3. Quick cylinder rear cover, 45. Cylinder column, 46. Upper template;

[0023] 5. injection unit, 6. mold cover assembly, 7. mold, 71. upper mold, 72. lower mold;

[0024] 8. Injection motor assembly, 81. Injection motor, 82. Injection motor adjustment plate, 83. Pressure strip, 84. Injection motor adjustment plate positioning block, 85. Motor adjustment positioning block;

[0025] 9. Transmission assembly, 91. Injection driving wheel, 92. Injection driven wheel assembly, 92-1. Injection driven wheel 1, 92-2. Injection driven wheel 2, 93. Synchronous belt, 94. Double screw assembly, 94-1. Ball screw, 94-2. Ball screw bearing assembly, 94-3. Screw bearing seat 1, 94-4. Ball screw bearing 1, 94-5. Screw bearing seat 2, 94-6. Ball screw bearing 2, 94-7. Ball screw flange;

[0026] 10. plunger assembly, 101. weighing sensor, 102. sensor fixing plate, 103. plunger flange, 104. plunger connecting rod, 105. plunger head, 106. heating rod;

[0027] 11. Shooting cylinder guide post assembly, 11-1. Shooting cylinder guide post, 11-2. Guide sleeve, 11-3. Guide post nut;

[0028] 12. Upper template, 13. Synchronous belt fixing plate, 14. Limit rod. DETAILED DESCRIPTION

[0029] The technical solution of the utility model is further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0030] Embodiment 1:

[0031] exist Figure 1 , Figure 2 In the illustrated embodiment, a double-screw single-plunger special purpose machine includes a clamping unit 4 and an injection unit 5 disposed on the clamping unit 4 .

[0032] The injection unit 5 is connected to the clamping unit 4 through two sets of shooting cylinder guide column assemblies 11. The injection unit 5 includes a transmission assembly 9, a double screw assembly 94 and a plunger assembly 10 arranged in a triangular structure. The shooting cylinder guide column assembly 11 and the double screw assembly 94 form a balanced force structure. The plunger assembly 10 is arranged on the inner side of the shooting cylinder guide column assembly 11 and the double screw assembly 94 to form a balanced injection structure.

[0033] The clamping unit 4 comprises a cylinder lower template 41 , a mold cylinder assembly 42 , a lower template 43 , a mold cylinder column 45 and an upper template 46 .

[0034] The lower end of the mold cylinder machine column 45 is fixedly connected to the cylinder lower template 41 , the upper end of the mold cylinder machine column 45 is connected to the upper template 46 , and the lower template 43 is arranged in the middle position of the mold cylinder machine column 45 .

[0035] The mold cylinder assembly 42 includes a mold cylinder sleeve 42-1 and a mold cylinder core shaft 42-2. The mold cylinder sleeve 42-1 is fixed at the center position of the lower plate surface of the lower mold plate 43, and the lower end of the mold cylinder core shaft 42-2 is connected to the cylinder lower mold plate 41.

[0036] The quick cylinder assembly 44 includes a quick cylinder sleeve 44-1 and a quick cylinder core shaft 44-2. The quick cylinder sleeve 44-1 is fixedly connected to the lower mold plate 43 through a quick cylinder rear cover 44-3 and is located on both sides of the mold cylinder assembly 42. The lower end of the quick cylinder core shaft 44-2 is connected to the cylinder lower mold plate 41.

[0037] The injection unit 5 is mounted on the upper mold plate 46 of the clamping unit 4 .

[0038] The injection unit 5 further comprises an injection motor assembly 8 and an upper mold plate 12. The transmission assembly 9 is driven by the injection motor assembly 8.

[0039] The shooting unit 5 is connected to the upper mold plate 46 via a shooting cylinder guide column assembly 11. The shooting cylinder guide column assembly 11 includes a shooting cylinder guide column 11-1 and a guide sleeve 11-2.

[0040] The lower end of the shooting cylinder guide post 11-1 is connected to the upper template 46 through a guide sleeve 11-2. The guide sleeve 11-2 is used to guide the shooting cylinder guide post. The upper end of the shooting cylinder guide post 11-1 is connected to a synchronous belt fixing plate 13 through a guide post nut 11-3, connecting the synchronous belt fixing plate 13 and the upper template 46 together.

[0041] There are two groups of the shooting cylinder guide posts 11 - 1 , which are respectively arranged at two corner positions of a group of diagonal lines of the upper template 46 .

[0042] The plunger assembly 10 is disposed on the lower plate surface of the upper mold plate 12 and can move up and down together with the upper mold plate 12 .

[0043] The injection motor assembly 8 includes an injection motor 81 and an injection motor adjustment plate 82 .

[0044] The injection motor 81 is mounted on the injection motor adjustment plate 82, and the injection motor adjustment plate 82 is adjustably connected and mounted on the synchronous belt fixing plate 13 through a group of pressure strips 83. A plurality of adjustment positioning holes are arranged on the pressure strips 83, which are used to adjust the distance between the injection motor adjustment plate and the synchronous belt fixing plate. The sides of the injection motor adjustment plate 82 and the pressure strips 83 are provided with injection motor adjustment plate positioning blocks 84, and the motor adjustment positioning blocks 85 are adjusted back at the matching position of the injection motor adjustment plate 82 and the free ends of the pressure strips 83, which are used to realize the adjustment and positioning of the injection motor.

[0045] The transmission assembly 9 includes an ejection driving wheel 91 , an ejection driven wheel assembly 92 and a synchronous belt 93 .

[0046] like Figure 3 As shown, the injection motor 81 is vertically arranged and the output shaft of the injection motor 81 is upwardly arranged, and the output shaft of the injection motor is arranged in parallel with the double-screw assembly 94 in a triangular structure, and the injection driving wheel 91 and the injection driven wheel assembly 92 are arranged in a three-point position.

[0047] The injection driving wheel 91 is fixedly connected to the output shaft of the injection motor 81 .

[0048] The double screw assembly 94 is provided with two groups, and the two groups of double screw assembly 94 are respectively arranged at the corner position where the other group of diagonal lines of the upper template 46 is located. The two groups of double screw assembly 94 and the two groups of shooting cylinder guide column assembly 11 form a four-point balance structure on the upper template 16. A limit rod 14 is also provided on the upper template 46 between the double screw assembly 94 and the shooting cylinder guide column assembly 11, which is used to limit the lower limit position of the upper template 12.

[0049] The double-screw assembly 94 includes two vertically arranged and mutually parallel ball screws 94 - 1 , the two ball screws 94 - 1 are arranged along a diagonal line of the synchronous belt fixing plate 13 ; the two shooting cylinder guide pillars 11 - 1 are arranged along another diagonal line of the synchronous belt fixing plate 13 .

[0050] The two ball screws 94 - 1 and the two shooting cylinder guide pins 11 - 1 form the balanced force structure between the synchronous belt fixing plate 13 and the upper mold plate 46 , and the balanced injection structure is formed between the balanced force structure and the plunger assembly 10 .

[0051] The upper end of the ball screw 94-1 extends to the upper part of the synchronous belt fixing plate 13. The ball screw flange 94-7 in the ball screw 94-1 is fixedly connected to the upper template, and the ball screw rotates to transmit the force to the ball screw flange, and the ball screw flange 94-7 moves up and down, thereby driving the upper template 12 to move up and down through the ball screw flange.

[0052] like Figure 4 As shown, the plunger assembly 10 includes a weighing sensor 101, a sensor fixing plate 102, a plunger flange 103, a plunger connecting rod 104 and a plunger head 105. The weighing sensor 101 is fixed to the lower plate surface of the upper mold plate 12 through the sensor fixing plate 102, the upper end of the plunger connecting rod 104 is fixedly connected to the sensor fixing plate 102 through the plunger flange 103 and the upper end of the plunger connecting rod 104 is inserted into the sensor fixing plate 102, a heating rod 106 is arranged inside the plunger connecting rod 104, and the plunger head 105 is fixed to the lower end of the plunger connecting rod 104 for realizing product injection.

[0053] Injection unit movement process:

[0054] The injection motor drives the injection driving wheel to rotate, and the injection driving wheel drives the injection driven wheel assembly to rotate through the synchronous belt. The injection driven wheel assembly drives the ball screw to rotate, and the force is applied to the ball screw flange, causing the ball screw flange to move up and down, driving the upper template to move up and down, and the upper and lower movement of the upper template drives the plunger head to move up and down, completing the injection of the product.

[0055] Embodiment 2:

[0056] exist Figure 5 In the illustrated embodiment, a double-screw single-plunger special machine includes a frame assembly 1, an electric control box assembly 2 and an operation box assembly 3 installed on the frame assembly 1, a clamping unit 4 and an injection unit 5 arranged on the clamping unit 4. A clamping cover assembly 6 for safety protection and a mold 7 for injection molding are also arranged on the frame assembly 1.

[0057] The electric control box assembly 2 includes various electrical components used by the machine. The operation box assembly 3 includes operation buttons and an operation display.

[0058] The injection unit 5 is connected to the clamping unit 4 through two sets of shooting cylinder guide column assemblies 11. The injection unit 5 includes a transmission assembly 9, a double screw assembly 94 and a plunger assembly 10 arranged in a triangular structure. The shooting cylinder guide column assembly 11 and the double screw assembly 94 form a balanced force structure. The plunger assembly 10 is arranged on the inner side of the shooting cylinder guide column assembly 11 and the double screw assembly 94 to form a balanced injection structure.

[0059] The clamping unit 4 comprises a cylinder lower template 41 , a mold cylinder assembly 42 , a lower template 43 , a mold cylinder column 45 and an upper template 46 .

[0060] The lower end of the mold cylinder machine column 45 is fixedly connected to the cylinder lower template 41 , the upper end of the mold cylinder machine column 45 is connected to the upper template 46 , and the lower template 43 is arranged in the middle position of the mold cylinder machine column 45 .

[0061] The mold cylinder assembly 42 includes a mold cylinder sleeve 42-1 and a mold cylinder core shaft 42-2. The mold cylinder sleeve 42-1 is fixed at the center position of the lower plate surface of the lower mold plate 43, and the lower end of the mold cylinder core shaft 42-2 is connected to the cylinder lower mold plate 41.

[0062] The quick cylinder assembly 44 includes a quick cylinder sleeve 44-1 and a quick cylinder core shaft 44-2. The quick cylinder sleeve 44-1 is fixedly connected to the lower mold plate 43 through a quick cylinder rear cover 44-3 and is located on both sides of the mold cylinder assembly 42. The lower end of the quick cylinder core shaft 44-2 is connected to the cylinder lower mold plate 41.

[0063] The mold 7 includes an upper mold 71 and a lower mold 72. The upper mold 71 is installed below the upper mold plate 46 of the clamping unit, and the lower mold 72 is installed on the lower mold plate 43 of the clamping unit. The upper mold 71 and the lower mold 72 form a complete mold.

[0064] The injection unit 5 is mounted on the upper mold plate 46 of the clamping unit 4 .

[0065] The injection unit 5 further comprises an injection motor assembly 8 and an upper mold plate 12. The transmission assembly 9 is driven by the injection motor assembly 8.

[0066] The shooting unit 5 is connected to the upper mold plate 46 via a shooting cylinder guide column assembly 11. The shooting cylinder guide column assembly 11 includes a shooting cylinder guide column 11-1 and a guide sleeve 11-2.

[0067] The lower end of the shooting cylinder guide post 11-1 is connected to the upper template 46 through a guide sleeve 11-2. The guide sleeve 11-2 is used to guide the shooting cylinder guide post. The upper end of the shooting cylinder guide post 11-1 is connected to a synchronous belt fixing plate 13 through a guide post nut 11-3, connecting the synchronous belt fixing plate 13 and the upper template 46 together.

[0068] There are two groups of the shooting cylinder guide posts 11 - 1 , which are respectively arranged at two corner positions of a group of diagonal lines of the upper template 46 .

[0069] The plunger assembly 10 is disposed on the lower plate surface of the upper mold plate 12 and can move up and down together with the upper mold plate 12 .

[0070] The injection motor assembly 8 includes an injection motor 81 and an injection motor adjustment plate 82 .

[0071] The injection motor 81 is mounted on the injection motor adjustment plate 82, and the injection motor adjustment plate 82 is adjustably connected and mounted on the synchronous belt fixing plate 13 through a group of pressure strips 83. A plurality of adjustment positioning holes are arranged on the pressure strips 83, which are used to adjust the distance between the injection motor adjustment plate and the synchronous belt fixing plate. The sides of the injection motor adjustment plate 82 and the pressure strips 83 are provided with injection motor adjustment plate positioning blocks 84, and the motor adjustment positioning blocks 85 are adjusted back at the matching position of the injection motor adjustment plate 82 and the free ends of the pressure strips 83, which are used to realize the adjustment and positioning of the injection motor.

[0072] The transmission assembly 9 includes an ejection driving wheel 91 , an ejection driven wheel assembly 92 and a synchronous belt 93 .

[0073] The injection motor 81 is vertically arranged and the output shaft of the injection motor 81 is upwardly arranged, and the output shaft of the injection motor is arranged in parallel with the double screw assembly 94 in a triangular structure, and the injection driving wheel 91 and the injection driven wheel assembly 92 are arranged at three points.

[0074] The injection driving wheel 91 is fixedly connected to the output shaft of the injection motor 81 .

[0075] The double screw assembly 94 is provided with two groups, and the two groups of double screw assembly 94 are respectively arranged at the corner position where the other group of diagonal lines of the upper template 46 is located. The two groups of double screw assembly 94 and the two groups of shooting cylinder guide column assembly 11 form a four-point balance structure on the upper template 16. A limit rod 14 is also provided on the upper template 46 between the double screw assembly 94 and the shooting cylinder guide column assembly 11, which is used to limit the lower limit position of the upper template 12.

[0076] The double-screw assembly 94 includes two vertically arranged and mutually parallel ball screws 94 - 1 , the two ball screws 94 - 1 are arranged along a diagonal line of the synchronous belt fixing plate 13 ; the two shooting cylinder guide pillars 11 - 1 are arranged along another diagonal line of the synchronous belt fixing plate 13 .

[0077] The two ball screws 94 - 1 and the two shooting cylinder guide pins 11 - 1 form the balanced force structure between the synchronous belt fixing plate 13 and the upper mold plate 46 , and the balanced injection structure is formed between the balanced force structure and the plunger assembly 10 .

[0078] Each set of double-screw assemblies 94 also includes a ball screw bearing assembly 94 - 2 .

[0079] The ball screw bearing assembly 94-2 is provided with two groups, upper and lower. The ball screw bearing assembly 94-2 connected to the lower template includes a screw bearing seat 1 94-3 and a ball screw bearing 1 94-4 arranged inside the screw bearing seat 1 94-3. The ball screw bearing assembly 94-2 connected to the synchronous belt fixing plate includes a screw bearing seat 2 94-5 and a ball screw bearing 2 94-6 arranged inside the screw bearing seat 2 94-5. The screw bearing seat 1 is fixedly connected to the upper template, and the screw bearing seat 2 is fixedly connected to the synchronous belt fixing plate.

[0080] The upper and lower ends of the ball screw 94-1 are connected to the synchronous belt fixing plate 13 and the upper template 46 through ball screw bearing seats, and the relative rotation connection between the synchronous belt fixing plate 13 and the upper template 46 is achieved through ball screw bearing 1 94-4 and ball screw bearing 2 94-6.

[0081] The upper end of the ball screw 94-1 extends to the upper part of the synchronous belt fixing plate 13. The ball screw flange 94-7 in the ball screw 94-1 is fixedly connected to the upper template, and the ball screw rotates to transmit the force to the ball screw flange, and the ball screw flange 94-7 moves up and down, thereby driving the upper template 12 to move up and down through the ball screw flange.

[0082] The ejection driven wheel assembly 92 includes an ejection driven wheel 1 92 - 1 and an ejection driven wheel 2 92 - 2 .

[0083] The ejection driven wheel 1 92-1 and the ejection driven wheel 2 92-2 are connected to the upper ends of the two ball screws 94-1 respectively. The synchronous belt 93 is wound around the ejection driving wheel 91, the ejection driven wheel 1 92-1 and the ejection driven wheel 2 92-2 to transmit the power of the ejection motor 81 to the ball screw. The ejection driving wheel 91, the ejection driven wheel 1 92-1 and the ejection driven wheel 2 92-2 are arranged at three points on the synchronous belt fixing plate 13, so that the synchronous belt wound thereon and the ejection driving wheel 91, the ejection driven wheel 1 92-1 and the ejection driven wheel 2 92-2 form a stable triangular transmission mechanism.

[0084] The injection motor 81 drives the injection driving wheel 91 to rotate, and the injection driving wheel 91 drives the injection driven wheel 1 92-1 and the injection driven wheel 2 92-2 to rotate through the synchronous belt 93. The injection driven wheel 1 92-1 and the injection driven wheel 2 92-2 drive the ball screw to rotate, and the force is applied to the ball screw flange, so that the ball screw flange moves up and down, driving the upper template 12 to move up and down. The upper and lower template 12 moves up and down, driving the plunger assembly 10 connected thereto to move up and down, thereby completing the injection of the product.

[0085] The plunger assembly 10 includes a weighing sensor 101, a sensor fixing plate 102, a plunger flange 103, a plunger connecting rod 104 and a plunger head 105. The weighing sensor 101 is fixed on the lower plate surface of the upper mold plate 12 through the sensor fixing plate 102. The upper end of the plunger connecting rod 104 is fixedly connected to the sensor fixing plate 102 through the plunger flange 103 and the upper end of the plunger connecting rod 104 is inserted into the sensor fixing plate 102. A heating rod 106 is arranged inside the plunger connecting rod 104. The plunger head 105 is fixed to the lower end of the plunger connecting rod 104 for realizing product injection.

[0086] Injection unit movement process:

[0087] The injection motor drives the injection driving wheel to rotate, and the injection driving wheel drives the injection driven wheel 1 and the injection driven wheel 2 to rotate through the synchronous belt. The injection driven wheel 1 and the injection driven wheel 2 drive the screw to rotate, and the force is applied to the ball screw flange, so that the ball screw flange moves up and down, driving the upper template to move up and down, and the up and down movement of the upper template drives the plunger head to move up and down, completing the injection effect of the product.

[0088] The double-screw single-plunger special machine described in the above embodiment drives a group of plunger assemblies through two groups of double-screw assemblies to realize the injection of the product. The double-screw structure makes the injection process more stable. The ejection driving wheel, the ejection driven wheel 1 and the ejection driven wheel 2 are arranged at three points to form a transmission mechanism of a triangular structure. The transmission mechanism of the triangular structure has stable power transmission, which effectively improves the overall structural strength of the special machine, has good strength and higher injection stability. At the same time, the double-screw structure is adopted. During the injection process, the double-screw structure is more stable, and the pressurization accuracy is higher, thereby effectively improving the injection accuracy and making the injection accuracy higher. The transmission mechanism of the triangular structure plus the double-screw structure greatly improves the service life of the entire special machine. Compared with the single-screw rod, the double-screw rod is more evenly stressed, which greatly extends the service life of the screw rod. Two groups of cylinder guide pins and two groups of double-screw assemblies are evenly distributed around the plunger assembly. The double guide pins and double ball screws act on both guidance and transmission, so that the plunger head will not be offset or unevenly stressed during the injection process, which greatly improves the quality of the product.

[0089] The above embodiments are only some of the embodiments of the utility model, not all of them. At the same time, based on the embodiments described in the utility model, all other embodiments obtained by ordinary technicians in this field on the basis of the technical solution of this application without creative work should fall within the scope of protection of the utility model.

Claims

1. A double-screw single-plunger special machine, comprising a clamping unit (4) and an injection unit (5), characterized in that: The injection unit (5) is connected to the clamping unit (4) via two sets of injection cylinder guide column assemblies (11). The injection unit (5) comprises a transmission assembly (9), a double screw assembly (94) and a plunger assembly (10) arranged in a triangular structure. The injection cylinder guide column assembly (11) and the double screw assembly (94) form a balanced force structure. The plunger assembly (10) is arranged inside the injection cylinder guide column assembly (11) and the double screw assembly (94) to form a balanced injection structure.

2. The double-screw single-plunger special machine according to claim 1, characterized in that: The clamping unit (4) comprises a lower cylinder template (41), a lower template (43) and an upper template (46); the upper template (46) is connected to the lower cylinder template (41) via a set of mold cylinder machine columns (45); the lower template (43) is arranged at the middle position of the mold cylinder machine column (45); a mold cylinder assembly (42) and a quick cylinder assembly (44) are arranged between the lower cylinder template (41) and the lower template (43).

3. The double-screw single-plunger special machine according to claim 2, characterized in that: The injection unit (5) is mounted on an upper mold plate (46) of a clamping unit (4); a limit rod (14) is provided on the upper mold plate (46).

4. The double-screw single-plunger special machine according to claim 2, characterized in that: The injection unit (5) further comprises an upper mold plate (12) for connecting the plunger assembly (10) and driving the plunger assembly (10) to move up and down, and a synchronous belt fixing plate (13) for mounting the transmission assembly (9).

5. The double-screw single-plunger special machine according to claim 4, characterized in that: Each group of shooting cylinder guide column assemblies (11) comprises a shooting cylinder guide column (11-1) and a guide sleeve (11-2), wherein the lower end of the shooting cylinder guide column (11-1) is connected to the upper template (46) via the guide sleeve (11-2), and the upper end of the shooting cylinder guide column (11-1) is connected to the synchronous belt fixing plate (13).

6. The double-screw single-plunger special machine according to claim 4, characterized in that: The double-screw assembly (94) comprises two ball screws (94-1) arranged vertically and parallel to each other, wherein the two ball screws (94-1) are arranged along a diagonal line of the synchronous belt fixing plate (13); and the two shooting cylinder guide columns (11-1) are arranged along another diagonal line of the synchronous belt fixing plate (13).

7. The double-screw single-plunger special machine according to claim 6, characterized in that: The two ball screws (94-1) and the two shooting cylinder guide posts (11-1) form the balanced force structure between the synchronous belt fixing plate (13) and the upper mold plate (46), and the balanced injection structure is formed between the balanced force structure and the plunger assembly (10).

8. The double-screw single-plunger special machine according to claim 4, characterized in that: The plunger assembly (10) comprises a weighing sensor (101), a plunger connecting rod (104) and a plunger head (105); the weighing sensor (101) is fixed to the lower plate surface of the upper mold plate (12) via a sensor fixing plate (102); the upper end of the plunger connecting rod (104) is fixedly connected to the sensor fixing plate (102) via a plunger flange (103); and the plunger head (105) is fixed to the lower end of the plunger connecting rod (104).

9. The double-screw single-plunger special machine according to any one of claims 1 to 8, characterized in that: The transmission assembly (9) comprises an injection driving wheel (91) driven by an injection motor (81), an injection driven wheel assembly (92) arranged on a double screw assembly (94), and a synchronous belt (93) wound around the injection driving wheel (91) and the injection driven wheel assembly (92).

10. The double-screw single-plunger special machine according to claim 9, characterized in that: The output shaft of the injection motor (81) is arranged vertically upward, and the output shaft of the injection motor and the double screw assembly (94) are arranged in parallel in a triangular structure, and the injection driving wheel (91) and the injection driven wheel assembly (92) are arranged at three points.

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