Injection machine for producing tire curing bladder based on quantitative control

Abstract

The invention belongs to the technical field of injection molding, and particularly relates to an injection molding machine for tire curing bladder production based on quantitative control, the injection molding machine comprises an injection device and an injection molding system, the injection molding system is arranged in the injection device, and the injection device comprises a base, a back plate, a lifter, an injection molding pump, a middle cavity, an upper mold and a lower mold; the back plate is fixedly installed on the front side of the upper portion of the base, the lifting machine is fixedly installed on the back plate, the injection molding pump is fixedly connected with the output end of the lifting machine and connected with an external liquid plastic pipeline, the upper portion of the middle cavity is connected with an injection molding pump pipeline, the lower portion of the middle cavity is connected with a liquid discharging pipe, and the liquid discharging pipe is connected with an upper mold pipeline. The device solves the problems that in the current injection molding process, due to the fact that the plastic discharge amount cannot be controlled in time, the molding quality is poor, and due to the liquidity problem of the plastic, part of the plastic is left in a pipeline, and the plastic amount cannot be accurately controlled.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding, and in particular relates to an injection machine for producing tire vulcanization bladders based on quantitative control. Background Art

[0002] The vulcanizing bladder is a hollow thin-walled rubber product of the tire vulcanizer. It is used to load the inner cavity of the tire to be vulcanized and then pass the heating medium into it. It cooperates with the vulcanizer to perform shaping and vulcanization operations. Generally, it is formed by injection molding, and the high-temperature liquefied plastic is injected into the mold by an injection machine to form the shape.

[0003] The fluidity of liquefied plastic is mainly affected by temperature, pressure and mold structure. The temperature of plastic cannot be accurately controlled during injection molding, resulting in unstable plastic fluidity. When plastic enters the mold, it passes through the pipe. Due to the poor fluidity of the plastic, some plastic remains in the pipe. The amount of plastic entering the mold is uncertain, resulting in poor quality of the tire curing bladder produced, and even defective products. This phenomenon has become a problem that needs to be solved urgently by people in this field. Summary of the invention

[0004] The object of the present invention is to provide an injection machine for producing tire curing bladders based on quantitative control to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an injection machine for producing tire vulcanization bladders based on quantitative control, comprising an injection device and an injection molding system, wherein the injection molding system is arranged in the injection device, and the injection device comprises a base, a back plate, a lifter, an injection molding pump, an intermediate cavity, an upper mold and a lower mold; the back plate is fixedly installed on the upper front side of the base, the lifter is fixedly installed on the back plate, the injection molding pump is fixedly connected to the output end of the lifter and is connected to an external liquid plastic pipeline, the upper part of the intermediate cavity is connected to the injection molding pump pipeline, and the lower part is connected to a drain pipe, the drain pipe is connected to the upper mold pipeline, the lower mold is fixedly installed on the upper part of the base and fits with the upper mold, a quantitative control mechanism is arranged inside the intermediate cavity, the quantitative control mechanism is electrically connected to the injection molding system, and a plastic amount identification device is arranged at the pipe mouth of the drain pipe for identifying the plastic discharge amount.

[0006] The present invention further illustrates that the quantitative control mechanism includes a motor, a gear, a rotating shaft, a bearing seat, a connecting rod, a tooth plate, an elastic expansion joint, a sliding rod and a ball blocking ball; the motor is fixedly installed on the left side of the middle cavity, the gear is fixedly connected to the output end of the motor, a sleeve is fixedly installed on the right side of the inner wall of the middle cavity, and a through hole is provided in the middle of the sleeve, the sliding rod is slidably connected in the through hole, and the lower end is fixed to the ball blocking ball, the upper and lower ends of the elastic expansion joint are respectively fixed to the lower end of the rotating shaft and the upper end of the sliding rod, the bearing seat is sleeved on the outside of the rotating shaft, and the two are connected by bearings, the tooth plate is fixedly installed on the left side of the bearing seat through the connecting rod, and the tooth plate and the gear are meshed with each other; the diameter of the ball blocking ball is equal to the inner diameter of the drain pipe.

[0007] The present invention further illustrates that a rotating rod is connected to the bearing on the left side of the inner wall of the intermediate cavity, a bevel gear is fixed to the lower end of the rotating rod, and the bevel gear and the gear are meshed with each other, a disc is fixed to the upper end of the rotating rod, a countersunk hole is fixed to the upper outer side of the disc, and a slider is slidably connected to the inside of the countersunk hole; a turntable is fixed to the outer side of the upper end of the rotating shaft, a hole is provided on the outer side of the turntable, a round rod is slidably connected to the inside of the hole, the upper end of the round rod is fixedly connected to the upper end of the slider, and a stirring blade is fixed to the lower end of the blocking ball.

[0008] The present invention further illustrates that a cylinder is fixed to the right side of the inner wall of the middle cavity, a ball is fixed to the output end of the cylinder, and the ball is located on the right side of the sliding rod; a pressing plate is fixed to the outer side of the lower end of the elastic telescopic joint, an arc block is fixed below the outer side of the pressing plate, and after the cylinder is extended, the ball contacts the arc block, and the ball is located below the arc block.

[0009] The present invention further illustrates that the injection molding system includes a plastic fluidity identification module and a control module, the plastic fluidity identification module is electrically connected to the control module, the control module is electrically connected to the motor and the cylinder respectively, the plastic fluidity identification module is used to identify the fluidity of the plastic by sensing the temperature of the liquid plastic, and the control module is used to control the movement mode of the motor and the extension and retraction action of the cylinder according to the fluidity of the plastic.

[0010] The present invention further illustrates that the control module controls the motor in the following two ways: mid ≤Q≤Q max When max is the maximum plastic fluidity identified by sensing the temperature of the liquid plastic, Q is the plastic fluidity identified by sensing the temperature of the liquid plastic, Q mid To detect the normal plastic fluidity by sensing the temperature of the liquid plastic: the motor rotates clockwise until the plugging ball blocks the drain pipe and then stops; when Q min ≤Q mid When min ​To detect the minimum plastic fluidity by sensing the temperature of the liquid plastic: the motor rotates clockwise until the plugging ball blocks the drain pipe and then rotates counterclockwise, and the plugging ball is still located in the drain pipe after the counterclockwise rotation stops, and the motor repeatedly rotates clockwise and counterclockwise.

[0011] The present invention further illustrates that the control module controls the extension and retraction of the cylinder in the following manner: when Q>Q min When: the cylinder is in the retracted state; when Q = Q min When: the cylinder is in the extended state.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention inserts a blocking ball into the drain pipe to block the drain pipe, thereby playing a role in quantitatively controlling the discharge of plastic, automatically controlling the discharge amount of plastic, avoiding excessive or insufficient discharge of glue to affect the molding quality of the tire curing bladder, and identifying the discharge amount of plastic through a plastic amount identification device. When the plastic discharge amount reaches a certain level, the motor immediately runs and rotates quickly, thereby blocking the drain pipe in the first place and stopping the discharge of plastic, with high efficiency;

[0013] The liquid plastic in the discharge pipe is stirred to improve its fluidity, so that the internal plastic flows downward quickly into the mold, improving the molding efficiency and production efficiency. The discharge pipe is blocked and the plastic in the discharge pipe is stirred. The two actions are performed simultaneously. After the blocking ball is inserted into the discharge pipe, the plastic inside is squeezed. The squeezing and stirring can further speed up the flow of the plastic, and it can be completed by using a set of mechanisms, reducing the manufacturing cost of the injection device.

[0014] At the same time, the stirring blades and the blocking ball bounce up and down, which increases the extrusion strength and dispersion strength of the plastic in the drainage pipe, thereby further accelerating the flow speed of the plastic and speeding up production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 is a schematic plan view of the intermediate cavity of the present invention;

[0018] Figure 3 It is a schematic diagram of the internal structure of the middle cavity of the present invention;

[0019] Figure 4 It is a schematic diagram of the structure in which the blocking ball moves up and down in the present invention;

[0020] Figure 5It is a schematic diagram of the structure for rotating the stirring blade in the present invention;

[0021] Figure 6 It is a schematic diagram of the module connection relationship of the injection molding system of the present invention;

[0022] In the figure: 1. base; 2. back plate; 3. lifter; 4. injection pump; 5. middle cavity; 51. discharge pipe; 52. motor; 521. gear; 53. rotating shaft; 531. bearing seat; 532. connecting rod; 533. tooth plate; 534. elastic expansion joint; 535. sliding rod; 536. ball blocking; 54. sleeve; 55. rotating rod; 551. bevel gear; 552. disc; 553. countersunk hole; 554. slider; 56. turntable; 561. round rod; 57. cylinder; 571. round ball; 58. pressing plate; 581. arc block; 59. stirring blade; 6. upper mold; 7. lower mold. DETAILED DESCRIPTION

[0023] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-6 The present invention provides a technical solution: an injection machine for producing tire curing bladders based on quantitative control, comprising an injection device and an injection molding system, the injection molding system being arranged in the injection device, the injection device comprising a base 1, a back plate 2, a lifter 3, an injection molding pump 4, an intermediate cavity 5, an upper mold 6 and a lower mold 7;

[0025] The back plate 2 is fixedly installed on the upper front side of the base 1, the lifter 3 is fixedly installed on the back plate 2, the injection pump 4 is fixedly connected to the output end of the lifter 3 and is connected to the external liquid plastic pipeline, the upper part of the middle cavity 5 is connected to the injection pump 4 pipeline, and the lower part is connected to the drain pipe 51, the drain pipe 51 is connected to the upper mold 6 pipeline, the lower mold 7 is fixedly installed on the upper part of the base 1 and fits with the upper mold 6, a quantitative control mechanism is arranged inside the middle cavity 5, the quantitative control mechanism is electrically connected to the injection molding system, and a plastic amount identification device is arranged at the pipe mouth of the drain pipe 51 for identifying the plastic discharge amount.

[0026] The quantitative control mechanism includes a motor 52, a gear 521, a rotating shaft 53, a bearing seat 531, a connecting rod 532, a tooth plate 533, an elastic expansion joint 534, a sliding rod 535 and a blocking ball 536;

[0027] The motor 52 is fixedly installed on the left side of the middle cavity 5, the gear 521 is fixedly connected to the output end of the motor 52, a sleeve 54 is fixedly installed on the right side of the inner wall of the middle cavity 5, and a through hole is set in the middle of the sleeve 54, the slide bar 535 is slidably connected in the through hole, and the lower end is fixed to the blocking ball 536, the upper and lower ends of the elastic expansion joint 534 are respectively fixed to the lower end of the rotating shaft 53 and the upper end of the slide bar 535, the bearing seat 531 is sleeved on the outer side of the rotating shaft 53, and the two are connected by bearings, the tooth plate 533 is fixedly installed on the left side of the bearing seat 531 through the connecting rod 532, and the tooth plate 533 and the gear 521 are meshed with each other;

[0028] The diameter of the blocking ball 536 is equal to the inner diameter of the drain pipe 51;

[0029] The injection molding machine is running, and the lifter 3 drives the middle cavity 5 to descend through the injection pump 4. The middle cavity 5 drives the upper mold 6 to move downward through the drainage pipe 51, so that the upper mold 6 and the lower mold 7 are fitted. Then the injection pump 4 is running, and the liquefied plastic is extracted from the outside through the pipeline and injected into the middle cavity 5, and then injected into the upper mold 6 through the drainage pipe 51. The liquefied plastic enters the upper mold 6 and the lower mold 7 to form the tire vulcanization bladder. During the injection molding process, the motor 52 is running, driving the gear 521 to rotate, and the gear 521 drives the tooth plate 533 to move downward through meshing. The tooth plate 533 drives the bearing seat 531 to move downward through the connecting rod 532, and the bearing seat 531 drives the rotating shaft 53 to move downward. 53 drives the slide bar 535 to move downward through the elastic expansion joint 534, and the slide bar 535 drives the blocking ball 536 to move downward until it is inserted into the drain pipe 51, thereby blocking the drain pipe 51, playing a role in quantitatively controlling the discharge of plastic, automatically controlling the discharge amount of plastic, and avoiding excessive or insufficient discharge of glue to affect the molding quality of the tire vulcanization bladder, wherein the total amount of plastic discharged is the space in the upper mold 6 and the lower mold 7 plus the space in the drain pipe 51 and the pipe connecting the drain pipe 51 and the upper mold 6. The plastic amount identification device identifies the plastic discharge amount. When the plastic discharge amount is reached, the motor 52 immediately runs and rotates quickly, thereby blocking the drain pipe 51 in the first time and stopping the discharge of plastic, which is highly efficient.

[0030] A rotating rod 55 is connected to the bearing on the left side of the inner wall of the middle cavity 5. A bevel gear 551 is fixed to the lower end of the rotating rod 55, and the bevel gear 551 is meshed with the gear 521. A disc 552 is fixed to the upper end of the rotating rod 55. A countersunk hole 553 is fixed to the upper outer side of the disc 552. A slider 554 is slidably connected to the inside of the countersunk hole 553.

[0031] A rotating disk 56 is fixed to the outer side of the upper end of the rotating shaft 53. A hole is arranged on the outer side of the rotating disk 56. A round rod 561 is slidably connected inside the hole. The upper end of the round rod 561 is fixedly connected to the upper end of the slider 554. A stirring blade 59 is fixed to the lower end of the blocking ball 536.

[0032] When the motor 52 rotates, the gear 521 rotates and drives the bevel gear 551 to rotate through meshing, the bevel gear 551 drives the rotating rod 55 to rotate through the bearing, the rotating rod 55 drives the disc 552 to rotate, the disc 552 drives the counterbore 553 to rotate around its center, thereby driving the slider 554 to rotate around its center, and since the slider 554 is connected to the rotating disk 56 through the round rod 561, the rotating disk 56 is driven to rotate through the round rod 561, the slider 554 rotates in the counterbore 553, the rotating disk 56 drives the rotating shaft 53 to rotate, thereby driving the blocking ball 53 6 rotates, the blocking ball 536 drives the stirring blade 59 to rotate, stirs the liquid plastic in the discharge pipe 51, improves its fluidity, and makes the internal plastic flow downward quickly into the mold, thereby improving the molding efficiency and production efficiency, and blocking the discharge pipe 51 and stirring the plastic in the discharge pipe 51, the two actions are performed simultaneously, after the blocking ball 536 is inserted into the discharge pipe 51, the plastic inside is squeezed, and the squeezing and stirring can further accelerate the flow of the plastic, and it can be completed by using a set of mechanisms, thereby reducing the manufacturing cost of the injection device.

[0033] A cylinder 57 is fixed to the right side of the inner wall of the middle cavity 5, a ball 571 is fixed to the output end of the cylinder 57, and the ball 571 is located on the right side of the slide rod 535;

[0034] A pressing plate 58 is fixed to the outer side of the lower end of the elastic expansion joint 534, and an arc block 581 is fixed to the lower side of the pressing plate 58. After the cylinder 57 is extended, the ball 571 contacts the arc block 581, and the ball 571 is located below the arc block 581.

[0035] During the injection process, the cylinder 57 operates, driving the ball 571 to move to the left until it moves to the bottom of the arc block 581. When the turntable 56 drives the elastic expansion joint 534 to rotate through the rotating shaft 53, the pressing plate 58 rotates, and the arc block 581 rotates around the center of the pressing plate 58 until it contacts the ball 571 and squeezes each other. The arc block 581 is forced to shorten the elastic expansion joint 534 through the pressing plate 58, and the internal spring is deformed by force. Then the arc block 581 rotates until it is out of contact with the ball 571. The elastic expansion joint 534 generates a reaction force to quickly reset, thereby driving the stirring blade 59 and the blocking ball 536 to jump up and down, thereby increasing the extrusion strength and the breaking strength of the plastic in the discharge pipe 51, thereby further accelerating the flow speed of the plastic and accelerating the production speed;

[0036] After the pressing plate 58 is subjected to upward force, the tooth plate 533 moves downward through the gear 521, so that pressure is applied downward from the top of the elastic expansion joint 534, further shortening the elastic expansion joint 534 and increasing the deformation strength of the internal spring, thereby further enhancing the breaking up strength and extrusion strength of the plastic. At this time, the plastic in the discharge pipe 51 can flow downward quickly, and the flow speed is maximized, so that the residual plastic in the pipe can be quickly and fully pressed into the mold, thereby accelerating the molding efficiency and improving the molding quality.

[0037] The injection molding system includes a plastic fluidity identification module and a control module. The plastic fluidity identification module is electrically connected to the control module, and the control module is electrically connected to the motor 52 and the cylinder 57 respectively. The plastic fluidity identification module is used to identify the fluidity of the plastic by sensing the temperature of the liquid plastic, and the control module is used to control the movement mode of the motor 52 and the extension and retraction action of the cylinder 57 according to the fluidity of the plastic.

[0038] The control module controls the motor 52 in the following two ways:

[0039] When Q mid ≤Q≤Q max When max is the maximum plastic fluidity identified by sensing the temperature of the liquid plastic, Q is the plastic fluidity identified by sensing the temperature of the liquid plastic, Q mid To detect the normal plastic fluidity by sensing the temperature of the liquid plastic: the motor 52 rotates clockwise until the blocking ball 536 blocks the drain pipe 51 and then stops;

[0040] When Q min ≤Q mid When min To sense the minimum plastic fluidity by sensing the temperature of the liquid plastic: the motor 52 rotates clockwise until the blocking ball 536 blocks the drain pipe 51 and then rotates counterclockwise. After the counterclockwise rotation stops, the blocking ball 536 is still located in the drain pipe 51. The motor 52 repeatedly rotates clockwise and counterclockwise.

[0041] The control module controls the extension and retraction movement of the cylinder 57 in the following manner:

[0042] When Q>Q min When: the cylinder 57 is in the retracted state;

[0043] When Q = Q min When: the cylinder 57 is in the extended state;

[0044] ​Different quantitative control methods are adopted for plastics with different fluidities. The first type of plastic has better fluidity, and the motor 52 only rotates clockwise to block the drain pipe 51 and stir the plastic. The fluidity of the second type of plastic becomes worse, and the motor 52 rotates clockwise and counterclockwise alternately to block the drain pipe 51 and stir the plastic, while the blocking ball 536 and the stirring blade 59 jump up and down. The third type of plastic has extremely poor fluidity. While the motor 52 rotates clockwise and counterclockwise alternately, the cylinder 57 extends to block the drain pipe 51 and stir the plastic, while the blocking ball 536 and the stirring blade 59 jump up and down, and the amplitude and intensity of the up and down jumping increase. The action intensity of the plastic in the drain pipe 51 is gradually increased or reduced according to the fluidity of the plastic, which can make the plastic quickly flow into the mold through the drain pipe 51 regardless of whether the fluidity is high or low, and can also reduce the overall energy consumption of the injection molding machine.

[0045] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0046] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection machine for producing tire curing bladders based on quantitative control, comprising an injection device and an injection molding system, characterized in that: The injection molding system is arranged in an injection device, and the injection device comprises a base (1), a back plate (2), a lifter (3), an injection molding pump (4), an intermediate cavity (5), an upper mold (6) and a lower mold (7); The back plate (2) is fixedly mounted on the upper front side of the base (1); the lift (3) is fixedly mounted on the back plate (2); the injection pump (4) is fixedly connected to the output end of the lift (3) and is connected to an external liquid plastic pipeline; the upper part of the intermediate cavity (5) is connected to the injection pump (4) pipeline and the lower part is connected to a discharge pipe (51); the discharge pipe (51) is connected to the upper mold (6) pipeline; the lower mold (7) is fixedly mounted on the upper part of the base (1) and is fitted with the upper mold (6); a quantitative control mechanism is arranged inside the intermediate cavity (5); the quantitative control mechanism is electrically connected to the injection molding system; a plastic quantity identification device is arranged at the pipe mouth of the discharge pipe (51) for identifying the plastic discharge amount.

2. The injection machine for producing tire curing bladders based on quantitative control according to claim 1, characterized in that: The quantitative control mechanism comprises a motor (52), a gear (521), a rotating shaft (53), a bearing seat (531), a connecting rod (532), a tooth plate (533), an elastic expansion joint (534), a sliding rod (535) and a blocking ball (536); The motor (52) is fixedly installed on the left side of the middle cavity (5), the gear (521) is fixedly connected to the output end of the motor (52), a sleeve (54) is fixedly installed on the right side of the inner wall of the middle cavity (5), and a through hole is provided in the middle of the sleeve (54), the slide rod (535) is slidably connected in the through hole, and the lower end is fixed to the blocking ball (536), the upper and lower ends of the elastic expansion joint (534) are respectively fixed to the lower end of the rotating shaft (53) and the upper end of the slide rod (535), the bearing seat (531) is sleeved on the outer side of the rotating shaft (53), and the two are connected by bearings, the tooth plate (533) is fixedly installed on the left side of the bearing seat (531) through the connecting rod (532), and the tooth plate (533) and the gear (521) are meshed with each other; The diameter of the blocking ball (536) is equal to the inner diameter of the drainage pipe (51).

3. The injection machine for producing tire curing bladders based on quantitative control according to claim 2, characterized in that: A rotating rod (55) is connected to a bearing on the left side of the inner wall of the intermediate cavity (5); a bevel gear (551) is fixed to the lower end of the rotating rod (55), and the bevel gear (551) and the gear (521) are meshed with each other; a disc (552) is fixed to the upper end of the rotating rod (55); a countersunk hole (553) is fixed on the upper outer side of the disc (552); and a slider (554) is slidably connected to the inside of the countersunk hole (553); A turntable (56) is fixed to the outer side of the upper end of the rotating shaft (53), a hole is provided on the outer side of the turntable (56), a round rod (561) is slidably connected inside the hole, the upper end of the round rod (561) is fixedly connected to the upper end of the slider (554), and a stirring blade (59) is fixed to the lower end of the blocking ball (536).

4. The injection machine for producing tire curing bladders based on quantitative control according to claim 3, characterized in that: A cylinder (57) is fixed on the right side of the inner wall of the intermediate cavity (5), a ball (571) is fixed on the output end of the cylinder (57), and the ball (571) is located on the right side of the sliding rod (535); A pressing plate (58) is fixed to the outer side of the lower end of the elastic expansion joint (534), and an arc block (581) is fixed below the outer side of the pressing plate (58). After the cylinder (57) is extended, the ball (571) contacts the arc block (581), and the ball (571) is located below the arc block (581).

5. The injection machine for producing tire curing bladders based on quantitative control according to claim 4, characterized in that: The injection molding system comprises a plastic fluidity identification module and a control module, wherein the plastic fluidity identification module is electrically connected to the control module, and the control module is electrically connected to the motor (52) and the cylinder (57) respectively, wherein the plastic fluidity identification module is used to identify the fluidity of the plastic by sensing the temperature of the liquid plastic, and wherein the control module is used to control the movement mode of the motor (52) and the extension and retraction action of the cylinder (57) according to the fluidity of the plastic.

6. The injection machine for producing tire curing bladders based on quantitative control according to claim 5, characterized in that: The control module controls the motor (52) in the following two ways: When Q mid ≤Q≤Q max When max is the maximum plastic fluidity identified by sensing the temperature of the liquid plastic, Q is the plastic fluidity identified by sensing the temperature of the liquid plastic, Q mid To detect the normal plastic fluidity by sensing the temperature of the liquid plastic: the motor (52) rotates clockwise until the blocking ball (536) blocks the liquid discharge pipe (51) and then stops; When Q min ≤Q mid When min To detect the minimum plastic fluidity by sensing the temperature of the liquid plastic: the motor (52) rotates clockwise until the blocking ball (536) blocks the drain pipe (51) and then rotates counterclockwise, and after the counterclockwise rotation stops, the blocking ball (536) is still located in the drain pipe (51), and the motor (52) repeatedly rotates clockwise and counterclockwise.​ 7. The injection machine for producing tire curing bladders based on quantitative control according to claim 6, characterized in that: The control module controls the extension and retraction movement of the cylinder (57) in the following manner: When Q>Q min When: the cylinder (57) is in the retracted state; When Q = Q min When: the cylinder (57) is in the extended state.

Images