An injection mold for accurately controlling flow rate

Abstract

The present invention relates to the technical field of injection molds, and more specifically discloses an injection mold that is convenient for accurately controlling flow rate, including a cooling device, one side of the cooling device is fixedly connected with a flow rate control device for heat-insulating and conveying plastic liquid, and the top of the flow rate control device is fixedly connected with a steam cooling device for cooling water vapor generated in the flow rate control device; the present invention is provided with a cooling device, and the plastic liquid enters the cavity between the first molding block and the second molding block from the hole in the middle of the first molding block and fully contacts the inner wall of the cavity, and solidifies after cooling to form a specific shape, and the side of the second molding block is provided with a through hole, and normal temperature water is stored inside the water tank shell. The water inside the water tank shell flows in the holes on the side of the second molding block, taking away the heat inside the second molding block, so that the temperature of the plastic liquid is reduced, and the effect of faster solidification is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and more particularly to an injection mold which is convenient for accurately controlling flow rate. Background Art

[0002] An injection mold is a device that injects liquid plastic and cools and solidifies it into a specified shape. A general injection mold consists of a cooling circulation system, an ejector pin, and a molding block. During the production process, the granular plastic is heated and melted and then enters the transmission device. The outlet of the transmission device is connected to the cavity of the molding block. The liquid plastic inside the transmission device is injected into the cavity between the molding blocks under high pressure. At this time, the cooling circulation system will take away the heat of the liquid plastic, allowing it to be cooled and molded faster. After the molding is completed, the two molding blocks automatically separate, and the ejector pin on the back of the molding block pushes the solid plastic to make it fall into the collection box, completing the production of a part.

[0003] However, the above injection molding process still has shortcomings, as follows:

[0004] First, in order to ensure the high efficiency of plasticity, the cooling circulation system of the injection molding machine is in an uninterrupted operation mode. However, the cooling circulation system removes heat through the circulation of cold water, and requires additional water circulation devices to supply water and control the circulation rate. In addition, due to the different lengths and adaptation ranges of existing injection molding pipes, when facing large-volume injection molding parts, the cooling system is difficult to maintain consistent cooling effects on injection molding materials at different positions in the injection mold, which will affect the fluidity of the injection molding material, resulting in a rough surface of the molded plastic.

[0005] Secondly, during injection molding production, the transmission system is composed of a sealed pipe and a threaded tube that fits inside it. The threaded rod rotates to push the liquid plastic in the gap between the thread and the sealed tube wall into the cavity in the middle of the molding block. During this process, the amount of liquid plastic in the cavity in the middle of the molding block is controlled by the rotation speed of the threaded rod, and the liquid plastic in the thread and the middle of the sealed tube wall is unevenly distributed. This makes it impossible to accurately control the amount of plastic liquid in the mold during each injection, resulting in differences in the density of the molded plastic products and the quality of the finished products cannot be guaranteed to be uniform.

[0006] Therefore, there is an urgent need to provide an injection mold that is convenient to accurately control flow rate. Summary of the invention

[0007] In order to overcome the above-mentioned defects of the prior art, the present invention provides an injection mold that is convenient for accurately controlling the flow rate, so as to solve the problems existing in the above-mentioned background technology.

[0008] The present invention provides the following technical solution: an injection mold that is convenient for accurately controlling flow rate, comprising a cooling device, one side of the cooling device is fixedly connected with a flow rate control device for heat preservation and transportation of plastic liquid, the top of the flow rate control device is fixedly connected with a steam cooling device for cooling water vapor generated in the flow rate control device, one end of the steam cooling device is fixedly connected with a cooling device, the cooling device is connected to the back of the flow rate control device through a water exchange device for exchanging water, the other side of the cooling device is movably connected with a fixer, and the outer side of the flow rate control device is fixedly connected with a protective box;

[0009] The cooling device includes a cold water tank for storing water, the cold water tank includes a water tank shell, one side of the water tank shell is fixedly connected with a fixing plate, the other side of the water tank shell is fixedly connected with a pressure gauge for measuring the internal pressure of the water tank shell, one side of the pressure gauge is fixedly connected with a pressure gauge, one side of the inside of the water tank shell is fixedly connected with a waterproof shell, the inside of the waterproof shell is fixedly connected with a thermistor, one side of the fixing plate is fixedly connected with a temperature detector, the front of the temperature detector is fixedly connected with a display panel, the inside of the water tank shell is fixedly connected with a second shaping block, and the second shaping block The block is provided with through holes for water heat dissipation around it, the back side of the second shaping block is fixedly connected to a sealing frame, the back side of the sealing frame is fixedly connected to a limiting block, the inside of the limiting block is movably connected to a push plate, the front side of the push plate is fixedly connected to a push pin, the back side of the push plate is fixedly connected to a push rod, the front side of the second shaping block is movably connected to the first shaping block, the top of the water tank shell is fixedly connected to a sealer, the front side of the limiting block is fixedly connected to a limiting rod, the fixer includes a fixed block, one side of the fixed block is movably connected to a round rod, and the inside of the protective box is fixedly connected to a support sheet.

[0010] Furthermore, the flow rate control device includes a second plastic liquid tube for conveying plastic liquid, the outer side of the second plastic liquid tube is fixedly connected with a heat-insulating material, the outer surface of the second plastic liquid tube is fixedly connected with a flow rate detector near the middle, the top of the flow rate detector is fixedly connected with a fixed rod, the outer side of the fixed rod is fixedly connected with a leak-proof ring near the top, the top of the fixed rod is fixedly connected with a measuring instrument, the front of the measuring instrument is fixedly connected with a display showing the real-time rate of the plastic liquid, one end of the second plastic liquid tube is fixedly connected with a sealing interface that seals the second plastic liquid tube to the cooling device, and the heat-insulating material A hot water cylinder is fixedly connected to the outside of the measuring instrument, and sealing rings are fixedly connected to both ends of the hot water cylinder. A data cable is fixedly connected to the back of the measuring instrument, and one end of the data cable is fixedly connected to a controller, and one side of the controller is fixedly connected to a pump for controlling the flow rate of the plastic liquid; a first plastic liquid tube is fixedly connected to the inside of the pump, and a second plastic liquid tube is fixedly connected to the middle of one end of the first plastic liquid tube. The water exchange device includes a water pipe, a one-way valve is fixedly connected to the middle of the water pipe, and both ends of the one-way valve are fixedly connected to fixed pipes, and the inside of the one-way valve is movably connected with an opening and closing piece that allows water to pass in one direction.

[0011] Furthermore, the steam cooling device includes a breathable shell, a thick conduit for conveying water vapor is fixedly connected to the interior of the breathable shell, a cooler for reducing the temperature of water vapor and located on the outer surface of the thick conduit is fixedly connected to the interior of the breathable shell, a motor located at the bottom of the cooler is fixedly connected to the interior of the breathable shell, one end of the motor is drivingly connected to a fan for wind heat dissipation, a fixing plate is fixedly connected to the bottom of the breathable shell, a valve is fixedly connected to the top of the thick conduit, and a thin conduit is fixedly connected to one end of the thick conduit.

[0012] Furthermore, the cooling device is internally filled with room temperature water for cooling the plastic liquid. The steam cooling device cools the water vapor generated in the flow rate control device and then introduces it into the cooling device. The pressure of the cooling device increases, and the water after absorbing heat enters the flow rate control device through the water exchange device.

[0013] Furthermore, the through hole on the side of the second shaping block is connected to the interior of the water tank shell, the water in the water tank shell fills the holes on the side of the second shaping block, the water inside the water tank shell is exchanged with the water in the flow rate control device, the resistance value of the waterproof shell will not fluctuate when the heat is stable, and the pointer of the pressure gauge will not fluctuate when the water exchange is stable.

[0014] Furthermore, the controller controls the power of the pump, the diameter of the second plastic liquid tube is six centimeters smaller than the diameter of the pump, and when the pump power is fixed, controlling the amount of plastic liquid transported in the second plastic liquid tube is more accurate than controlling the amount of plastic liquid transported in the pump. The flow rate detector measures the flow rate of the plastic liquid in the second plastic liquid tube by electromagnetic means, and the water in the hot water cylinder is kept at a constant temperature by external heating.

[0015] Furthermore, the opening and closing plate is composed of two leaves, which are semi-circular and have different diameters at both ends. The radius of the leaf close to the water tank shell is two centimeters larger than the radius of the other end. The water in the water tank shell flushes the leaves of the opening and closing plate open and then enters the hot water cylinder, and the water in the hot water cylinder cannot flush the leaves open.

[0016] Technical effects and advantages of the present invention:

[0017] 1. The present invention is provided with a cooling device, so that the interior of the hot water cylinder is always in a heated state, and water vapor is continuously generated during the production process. After being cooled by the steam cooling device, the water vapor enters the cold water tank to increase the air pressure in the cold water tank, and water is pressed out of the water pipe and enters the hot water cylinder to realize gas-liquid exchange. The water in the cold water tank absorbs the heat of the plastic liquid, which will cause the temperature to rise. By inputting part of the hot water into the hot water cylinder, and then the cooler cools the water vapor and transmits it to the water tank shell to achieve constant temperature. A through hole is opened on the side of the second molding block, and room temperature water is stored inside the water tank shell. The plastic liquid still has a very high temperature after entering the cavity. The water inside the water tank shell circulates in the holes on the side of the second molding block, taking away the heat inside the second molding block. Since the water in various places inside the water tank shell is connected, uniform cooling is achieved, which prevents the plastic liquid from having inconsistent cooling rates at various places, which causes wrinkles on the product surface. No additional water control system is required to achieve water cooling circulation and cooling treatment, which is simpler and more convenient.

[0018] 2. The present invention is provided with a measuring instrument, and the plastic liquid in the first plastic liquid tube flows into the second plastic liquid tube. Since the diameter of the second plastic liquid tube is smaller, the temperature of the plastic liquid is more uniform everywhere under the action of the thermal insulation material and the hot water inside the hot water cylinder, and it is easier to accurately control the flow rate of the plastic liquid, so as to better grasp the amount of plastic liquid injected into the cooling device. The flow rate detector detects the flow rate of the plastic liquid inside the second plastic liquid tube and displays the result on the display. The power of the pump is controlled according to the flow rate of the plastic liquid displayed on the display, so that the flow rate of the plastic liquid can be more accurately controlled to determine the amount of plastic liquid used in the production of each part, so as to achieve uniform quality of each finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the back side of the overall structure of the present invention.

[0021] Figure 3 It is a schematic diagram of the internal front view of the overall structure of the present invention.

[0022] Figure 4 The schematic diagram of the back of the overall structure of the present invention is as follows

[0023] Figure 5 It is a schematic cross-sectional view of the cooling device structure of the present invention.

[0024] Figure 6 It is a schematic diagram of the explosion of the cooling device structure of the present invention.

[0025] Figure 7 It is a schematic cross-sectional view of the structure of the flow velocity detection device of the present invention.

[0026] Figure 8 It is a schematic diagram of the explosion structure of the steam cooling device of the present invention.

[0027] Fig. 9 It is a schematic diagram of the explosion of the water exchange device structure of the present invention.

[0028] The accompanying drawings are marked as follows: 1. cooling device; 101. cold water tank; 1011. water tank shell; 1012. sealer; 1013. fixing plate; 1014. push rod; 1015. push plate; 1016. ejector pin; 1017. limit rod; 1018. sealing frame; 1019. second shaping block; 1020. limit block; 102. first shaping block; 103. pressure gauge; 1031. pressure gauge; 104. waterproof shell; 1041. thermistor; 1042. temperature detector; 1043. display panel; 2. flow rate control device; 201. second plastic liquid tube; 202. thermal insulation material; 203. flow rate detector; 204. hot water cylinder; 2 05, sealing interface; 206, sealing ring; 207, fixing rod; 208, leakproof ring; 209, measuring instrument; 210, display; 211, data line; 212, first plastic liquid tube; 213, pump; 214, controller; 3, steam cooling device; 301, breathable shell; 302, fixing plate; 303, cooler; 304, fan; 305, motor; 306, thin tube; 307, thick tube; 308, valve; 4, water exchange device; 401, water pipe; 402, fixing pipe; 403, one-way valve; 404, opening and closing plate; 5, fixing device; 501, fixing block; 502, round rod; 6, protective box; 601, supporting plate. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The injection mold for accurately controlling the flow rate involved in the present invention is not limited to the various structures described in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0030] Reference Figure 1-4 The present invention provides an injection mold for accurately controlling flow rate, comprising a cooling device 1, a flow rate control device 2 for heat preservation and conveying plastic liquid is fixedly connected to one side of the cooling device 1, a steam cooling device 3 for cooling water vapor generated in the flow rate control device 2 is fixedly connected to the top of the flow rate control device 2, one end of the steam cooling device 3 is fixedly connected to the cooling device 1, the cooling device 1 is connected to the back of the flow rate control device 2 through a water exchange device 4 for exchanging water, the other side of the cooling device 1 is movably connected to a fixture 5, and the outer side of the flow rate control device 2 is fixedly connected to a protective box 6;

[0031] In this embodiment, it needs to be specifically explained that a plastic liquid with a temperature between three hundred and five hundred degrees flows inside the flow rate control device 2, and room temperature water for cooling the plastic liquid is stored inside the cooling device 1. The steam cooling device 3 cools the water vapor generated in the flow rate control device 2 and then introduces it into the cooling device 1. The pressure of the cooling device 1 will increase, so that the water after absorbing heat enters the flow rate control device 2 through the water exchange device 4. Since part of the water after absorbing heat is lost and part of the water vapor after cooling enters, the temperature of the water in the cooling device 1 is balanced.

[0032] Reference Figure 5-6The cooling device 1 includes a cold water tank 101 for storing water, and the cold water tank 101 includes a water tank shell 1011. A fixing plate 1013 is fixedly connected to one side of the water tank shell 1011, and a pressure gauge 103 for measuring the internal pressure of the water tank shell 1011 is fixedly connected to the other side of the water tank shell 1011. A pressure gauge 1031 for displaying the pressure value is fixedly connected to one side of the pressure gauge 103. A waterproof shell 104 is fixedly connected to one side of the inside of the water tank shell 1011. A thermistor 1041 whose resistance value changes according to the temperature is fixedly connected to the inside of the waterproof shell 104. A temperature detector 1042 is fixedly connected to one side of the fixing plate 1013. A display panel 1043 for displaying the temperature value is fixedly connected to the front of the temperature detector 1042. A second shaping block 1019 is fixedly connected to the inside of the water tank shell 1011. The second shaping block 1019 is provided with through holes for water flow heat dissipation around it, the back of the second shaping block 1019 is fixedly connected with a sealing frame 1018, the back of the sealing frame 1018 is fixedly connected with a limiting block 1020, the inside of the limiting block 1020 is movably connected with a push plate 1015, the front of the push plate 1015 is fixedly connected with a pin 1016 for pushing the plastic to fall, the back of the push plate 1015 is fixedly connected with a push rod 1014 for transmitting thrust, the front of the second shaping block 1019 is movably connected with the first shaping block 102, the top of the water tank shell 1011 is fixedly connected with a sealer 1012, the front of the limiting block 1020 is fixedly connected with a limiting rod 1017, the fixer 5 includes a fixing block 501, one side of the fixing block 501 is movably connected with a round rod 502, and the inside of the protective box 6 is fixedly connected with a support sheet 601;

[0033] In the present embodiment, it needs to be specifically explained that the through hole on the side of the second shaping block 1019 is connected with the interior of the water tank shell 1011, the water in the water tank shell 1011 fills the holes on the side of the second shaping block 1019, and a sealing frame 1018 is provided in the gap between the limit block 1020 and the second shaping block 1019. The water in the water tank shell 1011 will not enter the gap between the limit block 1020 and the second shaping block 1019, the ejector pin 1016 and the push plate 1015 will not come into contact with the water, and the water will not enter the shaping cavity from the hole on the back of the second shaping block 1019 to affect the production. The water inside the water tank shell 1011 is exchanged with the water in the flow rate control device 2, and the resistance value of the waterproof shell 104 will not fluctuate when the heat is stable, and the pointer of the pressure gauge 1031 will not fluctuate when the water exchange is stable.

[0034] Reference Figure 7The flow rate control device 2 includes a second plastic liquid pipe 201 for conveying plastic liquid, a heat preservation material 202 is fixedly connected to the outside of the second plastic liquid pipe 201 to prevent the temperature of the second plastic liquid pipe 201 from losing, a flow rate detector 203 for measuring the flow rate of the plastic liquid is fixedly connected to the middle of the outer surface of the second plastic liquid pipe 201, a fixed rod 207 is fixedly connected to the top of the flow rate detector 203, a leak-proof ring 208 is fixedly connected to the outside of the fixed rod 207 near the top, a measuring instrument 209 is fixedly connected to the top of the fixed rod 207, and a display 210 for displaying the real-time rate of the plastic liquid is fixedly connected to the front of the measuring instrument 209. One end of 201 is fixedly connected with a sealing interface 205 that seals the second plastic liquid tube 201 and the cooling device 1, the outer side of the heat-insulating material 202 is fixedly connected with a hot water cylinder 204, and both ends of the hot water cylinder 204 are fixedly connected with anti-leakage sealing rings 206, the back of the measuring instrument 209 is fixedly connected with a data line 211 for transmitting signals, one end of the data line 211 is fixedly connected with a controller 214, and one side of the controller 214 is fixedly connected with a pump 213 for controlling the flow rate of the plastic liquid; the inside of the pump 213 is fixedly connected with the first plastic liquid tube 212, and the middle part of one end of the first plastic liquid tube 212 is fixedly connected with the second plastic liquid tube 201;

[0035] In this embodiment, it needs to be specifically explained that the controller 214 controls the power of the pump 213, thereby changing the conveying speed of the plastic liquid. The diameter of the second plastic liquid tube 201 is six centimeters smaller than the diameter of the pump 213. During the plastic liquid conveying process, the temperature will not decrease due to the heat preservation effect of the hot water cylinder 204. The flow rate detector 203 measures the flow rate of the plastic liquid in the second plastic liquid tube 201 by electromagnetic means, and the water in the hot water cylinder 204 is kept at a constant temperature by external heating.

[0036] Reference Figure 8-9 The steam cooling device 3 comprises a breathable shell 301, a thick conduit 307 for conveying water vapor is fixedly connected inside the breathable shell 301, a cooler 303 for reducing the temperature of water vapor is fixedly connected inside the breathable shell 301 and is located on the outer surface of the thick conduit 307, a motor 305 located at the bottom of the cooler 303 is fixedly connected inside the breathable shell 301, one end of the motor 305 is drivingly connected to a fan 304 for wind heat dissipation, a fixing plate 302 is fixedly connected to the bottom of the breathable shell 301, a valve 308 for controlling the on-off of the thick conduit 307 is fixedly connected to the top of the thick conduit 307, and a thin conduit 306 is fixedly connected to one end of the thick conduit 307, and a water exchange device comprises a water pipe, a one-way valve 403 is fixedly connected to the middle of the water pipe 401, both ends of the one-way valve 403 are fixedly connected to the fixed pipe 402, and the one-way valve 403 is movably connected to the inside of the one-way valve 403 to allow water to pass in one direction;

[0037] In this embodiment, it needs to be specifically explained that the water vapor generated in the hot water cylinder 204 enters the thick conduit 307. After the cooler 303 cools the water vapor, the water vapor enters the water tank shell 1011 through the thin conduit 306. The cooler 303 generates heat during operation. The fan 304 rotates to increase the air flow around the cooler 303. The opening and closing plate 404 is composed of two leaves. The leaves are semi-annular. The radius of the side of the leaf close to the water tank shell 1011 is two centimeters larger than the radius of the other end. The water in the water tank shell 1011 flushes the leaves of the opening and closing plate 404 and enters the hot water cylinder 204. The water in the hot water cylinder 204 cannot flush the leaves.

[0038] The working principle of the present invention is as follows: after being melted, the plastic liquid enters the second plastic liquid tube 201 through the first plastic liquid tube 212, and the end of the second plastic liquid tube 201 is connected to the hole in the middle of the first shaping block 102. The plastic liquid enters the cavity between the first shaping block 102 and the second shaping block 1019 through the hole in the middle of the first shaping block 102 and then fully contacts the inner wall of the cavity. After being cooled and solidified, a specific shape is formed. A through hole is provided on the side of the second shaping block 1019, and room temperature water is stored inside the cavity formed by the water tank shell 1011 and the second shaping block 1019. The sealing frame 1018 prevents the water in the water tank shell 1011 from entering the cavity of the second shaping block 1019. After entering the cavity, the plastic liquid transfers the temperature to the second shaping block. 1019, room temperature water flows through the holes on the side of the second shaping block 1019, so that the temperature of the second shaping block 1019 and the plastic liquid is reduced, so as to achieve a faster curing effect. After the curing is completed, the push rod 1014 pushes the push plate 1015 so that the ejector pin 1016 pushes the plastic product out to complete the production, thereby increasing the production efficiency. Moreover, since the water in various places inside the water tank shell 1011 is connected, uniform cooling is achieved, so that the fluidity of the injection molding material is consistent everywhere, and the inconsistent cooling rate of the plastic liquid in various places is prevented from causing wrinkles on the product surface. The interior of the hot water cylinder 204 is always in a heated state, the purpose is to keep the plastic liquid flowing in the second plastic liquid pipe 201 warm. During the production process, water vapor is continuously generated inside the hot water cylinder 204, and the water vapor is cooled by the steam cooling device 3 before being cooled. After entering the cold water tank 101, the air pressure in the cold water tank 101 increases. Under the action of pressure, water enters the hot water cylinder 204 from the water pipe 401 to achieve exchange. No additional water pumping device is needed. The water in the cold water tank 101 absorbs the heat of the plastic liquid, which will cause its own temperature to rise, but part of the hot water is input into the hot water cylinder 204. The cooler 303 cools the water vapor and then transmits it to the water tank shell 1011 to achieve constant temperature. The thermistor 1041 changes its own resistance through the internal water temperature of the water tank shell 1011 to achieve the temperature measurement effect, and monitors the internal water temperature of the water tank shell 1011 in real time. The pressure gauge 103 measures the internal pressure of the water tank shell 1011, which is convenient for adjusting the temperature of the hot water cylinder 204 to achieve water exchange balance. The plastic liquid in the first plastic liquid pipe 212 flows into the second In the plastic liquid tube 201, since the inner wall diameter of the second plastic liquid tube 201 is small, the plastic liquid can achieve a more uniform temperature everywhere under the action of the insulation material 202 and the hot water inside the hot water cylinder 204, and it is easier to accurately control the flow rate of the plastic liquid, so as to better grasp the amount of plastic liquid injected into the cooling device 1. The flow rate detector 203 detects the flow rate of the plastic liquid inside the second plastic liquid tube 201 and displays the result on the display 210. The power of the pump 213 is controlled according to the flow rate of the plastic liquid displayed on the display 210, so as to accurately control the flow rate of the plastic liquid to determine the amount of plastic liquid used in the production of each part, so as to achieve uniform quality of each finished product. The purpose of providing the water exchange device 4 is to allow the water in the cold water tank 101 to enter the hot water cylinder 204 under the action of air pressure.However, the water in the hot water cylinder 204 will not enter the cold water tank 101 from the water pipe 401, causing the temperature of the normal temperature water in the cold water tank 101 to rise.

[0039] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0040] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0041] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An injection mold for accurately controlling flow rate, comprising a cooling device (1), characterized in that: A flow rate control device (2) for heat-insulating and conveying plastic liquid is fixedly connected to one side of the cooling device (1); a steam cooling device (3) for cooling water vapor generated in the flow rate control device (2) is fixedly connected to the top of the flow rate control device (2); one end of the steam cooling device (3) is fixedly connected to the cooling device (1); the cooling device (1) is connected to the back of the flow rate control device (2) via a water exchange device (4) for exchanging water; a fixture (5) is movably connected to the other side of the cooling device (1); and a protective box (6) is fixedly connected to the outside of the flow rate control device (2); The cooling device (1) comprises a cold water tank (101) for storing water, the cold water tank (101) comprising a water tank shell (1011), one side of the water tank shell (1011) being fixedly connected to a fixing plate (1013), the other side of the water tank shell (1011) being fixedly connected to a pressure gauge (103) for measuring the internal pressure of the water tank shell (1011), one side of the pressure gauge (103) being fixedly connected to a pressure gauge (1031), one side of the interior of the water tank shell (1011) being fixedly connected to a waterproof shell (104), the interior of the waterproof shell (104) being fixedly connected to a thermistor (1041), one side of the fixing plate (1013) being fixedly connected to a temperature detector (1042), the front side of the temperature detector (1042) being fixedly connected to a display panel (1043), the interior of the water tank shell (1011) being fixedly connected to a second shaping block (1019), the second shaping block (101 9) is provided with through holes for water heat dissipation around the second shaping block (1019), the back side of the second shaping block (1019) is fixedly connected to a sealing frame (1018), the back side of the sealing frame (1018) is fixedly connected to a limiting block (1020), the inside of the limiting block (1020) is movably connected to a push plate (1015), the front side of the push plate (1015) is fixedly connected to a push pin (1016), and the back side of the push plate (1015) is fixedly connected to a push rod (1014), The front side of the second shaping block (1019) is movably connected to the first shaping block (102); the top of the water tank housing (1011) is fixedly connected to a sealer (1012); the front side of the limit block (1020) is fixedly connected to a limit rod (1017); the fixer (5) comprises a fixing block (501); one side of the fixing block (501) is movably connected to a round rod (502); and the interior of the protection box (6) is fixedly connected to a support sheet (601); The flow rate control device (2) comprises a second plastic liquid pipe (201) for conveying plastic liquid, the outer side of the second plastic liquid pipe (201) is fixedly connected with a heat-insulating material (202), a flow rate detector (203) is fixedly connected near the middle of the outer surface of the second plastic liquid pipe (201), a fixed rod (207) is fixedly connected to the top of the flow rate detector (203), a leak-proof ring (208) is fixedly connected to the outer side of the fixed rod (207) near the top, a measuring instrument (209) is fixedly connected to the top of the fixed rod (207), a display (210) for displaying the real-time rate of the plastic liquid is fixedly connected to the front of the measuring instrument (209), one end of the second plastic liquid pipe (201) is fixedly connected with a sealing interface (205) for sealingly connecting the second plastic liquid pipe (201) to the cooling device (1), the outer side of the heat-insulating material (202) is fixedly connected with a heat-insulating material (202). A water cylinder (204), both ends of the hot water cylinder (204) are fixedly connected with sealing rings (206), the back of the measuring instrument (209) is fixedly connected with a data line (211), one end of the data line (211) is fixedly connected with a controller (214), one side of the controller (214) is fixedly connected with a pump (213) for controlling the flow rate of plastic liquid; the pump (213) is fixedly connected with a first plastic liquid tube (212) inside, the middle of one end of the first plastic liquid tube (212) is fixedly connected with a second plastic liquid tube (201), the water exchange device (4) comprises a water pipe (401), the middle of the water pipe (401) is fixedly connected with a one-way valve (403), both ends of the one-way valve (403) are fixedly connected with fixed pipes (402), and the one-way valve (403) is movably connected with an opening and closing piece (404) inside for allowing water to pass in one direction.

2. An injection mold for accurately controlling flow rate according to claim 1, characterized in that: The steam cooling device (3) comprises a breathable shell (301), a thick conduit (307) for conveying water vapor is fixedly connected inside the breathable shell (301), a cooler (303) for reducing the temperature of water vapor, which is located on the outer surface of the thick conduit (307), is fixedly connected inside the breathable shell (301), a motor (305) located at the bottom of the cooler (303) is fixedly connected inside the breathable shell (301), one end of the motor (305) is drivingly connected to a fan (304) for wind heat dissipation, a fixing plate (302) is fixedly connected to the bottom of the breathable shell (301), a valve (308) is fixedly connected to the top of the thick conduit (307), and a thin conduit (306) is fixedly connected to one end of the thick conduit (307).

3. The injection mold for accurately controlling flow rate according to claim 1, characterized in that: The cooling device (1) contains room temperature water for cooling the plastic liquid. The steam cooling device (3) cools the water vapor generated in the flow rate control device (2) and then introduces it into the cooling device (1). The pressure of the cooling device (1) increases, and the water after absorbing heat enters the flow rate control device (2) through the water exchange device (4).

4. The injection mold for accurately controlling flow rate according to claim 1, characterized in that: The through hole on the side of the second shaping block (1019) is connected to the interior of the water tank shell (1011), and the water in the water tank shell (1011) fills the holes on the side of the second shaping block (1019). The water inside the water tank shell (1011) is exchanged with the water in the flow rate control device (2). When the heat is stable, the resistance value of the waterproof shell (104) will not fluctuate, and when the water exchange is stable, the pointer of the pressure gauge (1031) will also not fluctuate.

5. The injection mold for accurately controlling flow rate according to claim 1, characterized in that: The controller (214) controls the power of the pump (213); the diameter of the second plastic liquid tube (201) is six centimeters smaller than the diameter of the pump (213); the flow rate detector (203) measures the flow rate of the plastic liquid in the second plastic liquid tube (201) by electromagnetic means; and the water in the hot water cylinder (204) is kept at a constant temperature by external heating.

6. The injection mold for accurately controlling flow rate according to claim 1, characterized in that: The said opening and closing plate (404) is composed of two leaf plates, which are semi-circular in shape. The radius of the leaf plate close to the water tank shell (1011) is two centimeters larger than the radius of the other end. The water in the water tank shell (1011) flushes the leaf plates of the opening and closing plate (404) open and then enters the hot water cylinder (204). The water in the hot water cylinder (204) cannot flush the leaf plates open.

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