Fusion-mark-free injection molding structure of precise grid floor mold

Abstract

The invention relates to the technical field of plastic processing, and discloses a precise grid floor mold weld-mark-free injection molding structure which comprises a portal frame, an injection mold assembly is installed in the portal frame and comprises a fixed mold blank and a movable mold blank, and a grid floor injection mold cavity is formed between the fixed mold blank and the movable mold blank; a plastic injection pipe is arranged outside the fixed mold blank; the injection mold assembly further comprises an exhaust mechanism, a vacuumizing assembly and a blocking mechanism. The plastic injection pipe is plugged through the plugging mechanism, and then the vacuumizing assembly and the exhaust mechanism are controlled to vacuumize the injection mold cavity, so that a vacuum environment is formed in the injection mold cavity, molten plastic in the injection gun can conveniently and quickly enter the injection mold cavity, and the phenomenon that the plastic in the injection mold cavity is cooled unevenly is avoided. And meanwhile, the problem of injection molding air trapping in an injection mold cavity can be solved, the quality of the injection-molded precise grid is effectively guaranteed, and the injection molding effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic processing, in particular to a precision grid floor mould injection moulding structure without welding marks. Background Art

[0002] In car wash shops, precision grid floors are usually used. By setting up the precision grid floors, a floor with a hollow cavity is formed, so that the sewage generated during the car wash can flow out in time, making it easier to wash the car. The precision grid floors are usually formed by injection molding.

[0003] However, since the precision grid floor is composed of horizontal and vertical strips and node cylinders, the overall structure is complex, the structure is small, the frame is deep, and it is a plate-like structure. Therefore, when injecting such plastic molds, air is usually trapped inside, resulting in problems such as non-parallel glue flow, obvious welding marks, and lack of glue at the frame, which affects the appearance quality and mechanical properties of the final precision grid floor.

[0004] In the prior art, air-permeable steel or exhaust ports are usually used to evacuate the injection mold cavity to reduce internal trapped air, thereby improving the injection molding quality. However, the overall price of air-permeable steel is high, which leads to high processing costs. The overall structure of the existing exhaust port is simple, and it is easy to cause the air port to form nodes during the injection molding process, affecting the overall appearance of the injection molded product, and it is easy to cause the air port to be blocked during injection molding, thereby increasing the maintenance cost of the mold. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a precision grid floor mold injection molding structure without welding marks, which has the advantages of good exhaust effect and high precision grid molding quality.

[0006] To achieve the above object, the present invention provides the following technical solutions: A precision grid floor mold injection molding structure without welding marks, comprising a gantry, an injection mold assembly is installed inside the gantry, the mold assembly comprises a fixed mold blank and a movable mold blank, a grid floor injection mold cavity is formed between the fixed mold blank and the movable mold blank, and an injection plastic tube is arranged outside the fixed mold blank; The injection mold assembly also includes an exhaust mechanism, a vacuum pumping assembly and a sealing mechanism; The exhaust mechanism is used to evacuate the injection mold cavity, and the exhaust mechanism includes an exhaust pipe fixedly connected to the fixed mold blank, the outside of the exhaust pipe is fixedly connected to an exhaust pipe, the exhaust pipe is connected to the injection mold cavity, and the outside of the vacuum assembly is provided with a connecting pipe, the connecting pipe is connected to the exhaust pipe; The blocking mechanism comprises a blocking block inserted into the inside of the injection molding plastic pipe, and the blocking block is used to seal and isolate the injection molding plastic pipe from being connected to the injection molding cavity.

[0007] Preferably: a spacer layer is arranged on the outside of the fixed mold blank and the movable mold blank, the injection mold assembly further comprises a fixed mold base, a movable mold base, a fixed mold and a movable mold, the fixed mold blank is embedded in the interior of the fixed mold, the movable mold base is embedded in the interior of the movable mold, the spacer layer is arranged between the fixed mold blank, the movable mold blank and the fixed mold and the movable mold, the fixed mold base and the fixed mold are fixedly connected, the vacuum extraction assembly is installed on the outside of the fixed mold base, and the outside of the fixed mold base is fixedly connected with an injection port.

[0008] Preferably, the vacuum pumping assembly includes an indicator light, and an inflation tube is provided outside the vacuum pumping assembly.

[0009] Preferably: a plurality of interconnected spacing grooves are provided between the spacing layers, cooling water pipes are installed inside the spacing grooves, the joints between the movable mold blank and the fixed mold blank are located in the spacing grooves, the spacing grooves are connected to the inflation pipes, and a first air pressure detector is provided inside the spacing grooves.

[0010] Preferably: the exhaust pipe is fixedly connected to a guide rod inside, the air valve block is slidably connected to the outside of the guide rod, the outer diameter of the air valve block is matched with the inner diameter of the exhaust pipe, the side wall of the exhaust pipe is provided with a guide groove, the air valve block is fixedly connected to the outside of the valve position protrusion, the valve position protrusion is slidably connected to the inside of the guide groove, the exhaust pipe is provided with an annular air hole inside, the exhaust pipe is provided with an exhaust hole connecting the annular air hole and the guide groove, the exhaust pipe is provided with a connecting air hole connecting the annular air hole, the connecting air hole is provided with an exhaust hole outside, the exhaust hole is used to connect the connecting air hole and the exhaust pipe, and the exhaust pipe is connected to the exhaust pipe via the exhaust hole, the annular air hole, the connecting air hole and the exhaust hole.

[0011] Preferably: a valve position spring is provided between the air valve block and the exhaust pipe, the air valve block is used to block the exhaust hole, and the exhaust pipe is used to communicate with the injection mold cavity.

[0012] Preferably: a limiting hole is opened inside the exhaust pipe, the limiting hole is located at the bottom of the air valve block, the limiting hole is slidably connected to a limiting block inside, a stop spring is arranged between the limiting block and the limiting hole, side connecting grooves are evenly opened on the outer side of the inner hole wall of the limiting hole, and a side buffer groove is opened on the outer bottom of the limiting hole.

[0013] Preferably, the limit stopper is located at the bottom of the air valve block, the limit stopper is used to limit the downward movement of the air valve block, and an adjusting air hole is opened outside the limit hole, and the adjusting air hole is used to connect the limit hole and the connecting air hole.

[0014] Preferably, a locator is arranged inside the limiting hole, and a positioning piece adapted to the locator is arranged outside the limiting block.

[0015] Preferably: an adjusting pneumatic rod is provided on the outside of the blocking block, a driving end of the adjusting pneumatic rod is fixedly connected to the blocking rod, the blocking block is fixedly connected to the bottom of the blocking rod, a reset spring is provided on the outside of the blocking block, the reset spring controls the blocking block to converge above the injection molded plastic tube in an initial state, the adjusting pneumatic rod is used to control the blocking block to move downward through the blocking rod, and a second air pressure detector for detecting other pressures inside the injection mold cavity is provided inside the blocking block.

[0016] Beneficial effects of the present invention: 1. The precision grid floor mold has a non-weld mark injection molding structure. The injection plastic tube is sealed by a sealing mechanism, and then the vacuum assembly and the exhaust mechanism are controlled to vacuum the injection mold cavity, so that the injection mold cavity forms a vacuum environment, thereby facilitating the molten plastic inside the injection molding gun to quickly enter the injection mold cavity, avoiding the problem of fault cracks and weld marks on the surface of the finished precision grid floor due to uneven cooling of the plastic inside the injection mold cavity. At the same time, vacuuming the injection mold cavity can reduce the problem of trapped air inside the injection mold cavity, reduce the problems of non-parallel glue running, obvious welding marks, and lack of glue at the bone position of the finished product, effectively ensure the quality of precision grids molded by injection, and improve the injection molding effect.

[0017] 2. The precision grid floor mold has a non-weld mark injection molding structure. A vacuum environment is formed inside the injection mold cavity through a vacuum pumping component, and a high-pressure environment is formed inside the spacing groove, so that a pressure difference is formed inside and outside the injection mold cavity. The air pressure value changes of the spacing groove and the injection mold cavity are detected by the first air pressure detector and the second air pressure detector. The air tightness detection effect of the injection mold cavity is effectively improved by detecting the difference change between the inside and outside of the injection mold cavity and the separate air pressure value changes of the injection mold cavity and the spacing groove. The air tightness of the fixed mold blank and the movable mold blank is detected by the air pressure change value, so as to achieve the mold correction effect of the fixed mold blank and the movable mold blank. When the fixed mold blank and the movable mold blank are offset in the mold, the injection mold cavity leaks, which leads to the formation of a dislocation layer inside the injection mold cavity, resulting in an uneven surface of the precision grid at the dislocation leakage position, and the phenomenon of weld marks on the precision grid, thereby achieving the purpose of detecting the mold closing effect and mold closing air tightness of the fixed mold blank and the movable mold blank.

[0018] 3. The precision grid floor mold has an injection molding structure without welding marks. By sealing the injection plastic tube, the vacuum effect of the injection mold cavity is further improved. After the injection molding is completed, the sealing block can be controlled to move downward again, and the injection mold cavity and the injection molding gun are cut off by the sealing block, thereby effectively further improving the injection molding effect of the injection mold cavity and reducing the adhesion between the injection mold cavity and the injection molding gun, thereby ensuring the flatness of the injection molding port of the precision grid floor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main body of the injection mold of the present invention; Figure 2 It is a schematic diagram of the injection mold of the present invention; Figure 3 This is a schematic diagram of the connection between the injection mold and the vacuum assembly of the present invention; Figure 4 This is a schematic diagram of a cross-sectional view of the injection mold of the present invention; Figure 5 For the present invention Figure 4 A magnified schematic diagram of part A; Figure 6 It is a schematic diagram of the exhaust mechanism of the present invention; Figure 7 It is a cross-sectional schematic diagram of the exhaust mechanism of the present invention; Figure 8 It is a schematic diagram of the blocking mechanism of the present invention; Fig. 9 For the present invention Figure 6 An enlarged schematic diagram of part B.

[0020] In the figure: 1, gantry; 2, fixed mold base; 3, movable mold base; 4, fixed mold; 5, movable mold; 6, fixed mold blank; 7, movable mold blank; 8, spacer layer; 9, injection port; 10, injection plastic pipe; 11, exhaust mechanism; 12, vacuum assembly; 13, blocking mechanism; 81. A first air pressure detector; 111, air extraction pipe; 112, exhaust pipe; 113, guide rod; 114, air valve block; 115, valve position spring; 116, guide slide groove; 117, valve position bump; 118, annular air hole; 119, exhaust hole; 1110, connecting air hole; 1111, air extraction hole; 1112, limit hole; 1113, limit stopper; 1114, stop spring; 1115, regulating air hole; 1116, side connecting groove; 1117, side buffer groove; 1118, positioner; 1119, positioning sheet; 121. indicator light; 122. connecting pipe; 123. inflatable pipe; 131. Sealing block; 132. Return spring; 133. Adjusting air pressure rod; 134. Sealing rod; 135. Second air pressure detector. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0022] Example 1. Please refer to Figure 1- Fig. 9 A precision grid floor mold injection molding structure without welding marks, comprising a gantry 1, an injection mold assembly is installed inside the gantry 1, the mold assembly comprises a fixed mold blank 6 and a movable mold blank 7, a grid floor injection mold cavity is formed between the fixed mold blank 6 and the movable mold blank 7, and an injection plastic tube 10 is arranged outside the fixed mold blank 6; The injection mold assembly also includes an exhaust mechanism 11, a vacuum assembly 12 and a blocking mechanism 13; The exhaust mechanism 11 is used to evacuate the injection mold cavity. The exhaust mechanism 11 includes an exhaust pipe 111 fixedly connected to the fixed mold blank 6. The exhaust pipe 112 is fixedly connected to the outside of the exhaust pipe 111. The exhaust pipe 112 is connected to the injection mold cavity. The outside of the vacuum assembly 12 is provided with a connecting pipe 122, which is connected to the exhaust pipe 111. The blocking mechanism 13 includes a blocking block 131 inserted into the injection molding material tube 10 , and the blocking block 131 is used to seal and isolate the injection molding material tube 10 from being connected to the injection molding cavity.

[0023] refer to Figure 4 , wherein a spacer layer 8 is arranged outside the fixed mold blank 6 and the movable mold blank 7, the injection mold assembly also includes a fixed mold base 2, a movable mold base 3, a fixed mold 4 and a movable mold 5, the fixed mold base 6 is embedded in the interior of the fixed mold 4, the movable mold base 7 is embedded in the interior of the movable mold 5, the spacer layer 8 is arranged between the fixed mold base 6, the movable mold base 7 and the fixed mold 4 and the movable mold 5, the fixed mold base 2 and the fixed mold 4 are fixedly connected, the vacuum assembly 12 is installed on the outside of the fixed mold base 2, and the outside of the fixed mold base 2 is fixedly connected with an injection port 9.

[0024] It should be noted that the gantry 1 also includes a suspension and a guide rail. The movable mold base 3 moves on the gantry 1. The suspension and the guide rail are used to assist the movable mold base 3 in moving and closing the mold.

[0025] Furthermore, during the injection molding process, after the fixed mold blank 6 and the movable mold blank 7 are controlled to be molded together, the fixed mold blank 6 and the movable mold blank 7 are molded together to form an injection mold cavity.

[0026] Then the injection gun can be controlled to inject the molten plastic into the injection mold cavity through the injection plastic pipe 10, and the precision grid floor is finally formed inside the injection mold cavity.

[0027] Furthermore, before injection molding, the injection molding material tube 10 is sealed by the sealing mechanism 13, and then the vacuum assembly 12 and the exhaust mechanism 11 are controlled to perform vacuum treatment on the injection mold cavity, so that the injection mold cavity forms a vacuum environment, thereby facilitating the molten plastic inside the injection molding gun to quickly enter the injection mold cavity, avoiding the problem of uneven cooling of the plastic inside the injection mold cavity, which may lead to fault cracks in the finished product precision grid floor and weld marks on the surface. At the same time, vacuum treatment of the injection mold cavity can reduce the problem of air entrapment in the injection mold cavity, reduce the problems of non-parallel glue running, obvious welding marks, and lack of glue at the bone position in the finished product, effectively ensure the quality of the precision grid molded by injection molding, and improve the injection molding effect.

[0028] refer to Figure 3 In an optional embodiment, the vacuum assembly 12 includes an indicator light 121 , and an inflation tube 123 is disposed outside the vacuum assembly 12 .

[0029] It should be noted that a plurality of air valves are arranged inside the vacuum assembly 12 . The vacuum assembly 12 is configured as a connector and a control element of a vacuum pump. The vacuum pump performs vacuum processing on the injection mold cavity through the vacuum assembly 12 .

[0030] refer to Figure 4 and Figure 5 In an optional embodiment, a plurality of interconnected spacing grooves are provided between the spacing layers 8, cooling water pipes are installed inside the spacing grooves, the joints between the movable mold blank 7 and the fixed mold blank 6 are located inside the spacing grooves, the spacing grooves are connected to the inflation pipe 123, and a first air pressure detector 81 is provided inside the spacing grooves.

[0031] It should be noted that the spacer layer 8 is used to assist in the installation of the fixed die blank 6 and the movable die blank 7. The spacer layer 8 is provided with a plurality of interconnected spacer grooves through a machining center. The spacer grooves can be set as narrow and long grooves or connecting holes. The cooling water pipe is installed on the outside of the fixed die blank 6 and the movable die blank 7 through the spacer grooves. The spacer layer 8 is respectively installed inside the fixed mold 4 and the movable mold 5, and the two spacer layers 8 are sealed and connected.

[0032] Furthermore, the vacuum assembly 12 pumps gas into the spacing groove through the inflation tube 123 to form a gas protection layer outside the injection mold cavity, wherein the gas pressure inside the spacing groove is greater than the standard atmospheric pressure, and the gas pressure inside the spacing groove is set to 32kpa to 120kpa.

[0033] It also includes a second air pressure detector 135 for detecting the air pressure value inside the injection mold cavity.

[0034] A vacuum environment is formed inside the injection mold cavity by the vacuum pumping component 12, and a high-pressure environment is formed inside the spacing groove, so that a pressure difference is formed inside and outside the injection mold cavity, and the first air pressure detector 81 and the second air pressure detector 135 are used to detect the changes in the air pressure values ​​of the spacing groove and the injection mold cavity. By detecting the changes in the difference between the inside and outside of the injection mold cavity and the changes in the individual air pressure values ​​of the injection mold cavity and the spacing groove, the air tightness detection effect of the injection mold cavity is effectively improved, and the air tightness of the fixed mold blank 6 and the movable mold blank 7 is detected by the air pressure change value, so as to achieve the correction effect of the mold closing of the fixed mold blank 6 and the movable mold blank 7. When the fixed mold blank 6 and the movable mold blank 7 are offset during the mold closing, air leakage occurs in the injection mold cavity, which leads to the formation of a dislocation layer inside the injection mold cavity, resulting in an uneven surface of the precision grid at the dislocation leakage position, and the phenomenon of welding marks on the precision grid, thereby achieving the purpose of detecting the mold closing effect and air tightness of the fixed mold blank 6 and the movable mold blank 7.

[0035] Furthermore, when an airtightness problem is detected in the injection mold cavity, the indicator light 121 flashes red to provide a prompt, making it convenient for the staff to perform maintenance and adjustments.

[0036] Example 2. Reference Figure 6 , Figure 7 and Fig. 9 On the basis of the first embodiment, the exhaust pipe 112 is further fixedly connected with a guide rod 113 inside, the air valve block 114 is slidably connected to the outside of the guide rod 113, the outer diameter of the air valve block 114 is adapted to the inner diameter of the exhaust pipe 112, the side wall of the exhaust pipe 112 is provided with a guide groove 116, the outside of the air valve block 114 is fixedly connected with a valve position protrusion 117, the valve position protrusion 117 is slidably connected to the inside of the guide groove 116, and the exhaust pipe 112 is provided with an annular air hole 118 inside. An exhaust hole 119 is provided inside the exhaust pipe 112 to connect the annular air hole 118 and the guide groove 116. A connecting air hole 1110 is provided inside the exhaust pipe 112 to connect the annular air hole 118. An exhaust hole 1111 is provided outside the connecting air hole 1110. The exhaust hole 1111 is used to connect the connecting air hole 1110 and the exhaust pipe 111. The exhaust pipe 112 is connected to the exhaust pipe 111 via the exhaust hole 119, the annular air hole 118, the connecting air hole 1110 and the exhaust hole 1111.

[0037] A valve position spring 115 is provided between the air valve block 114 and the exhaust pipe 112 . The air valve block 114 is used to block the exhaust hole 119 , and the exhaust pipe 112 is used to communicate with the injection mold cavity.

[0038] It should be noted that when the injection mold cavity is evacuated, the vacuum assembly 12 is connected to the exhaust pipe 111 through the connecting pipe 122, and exhaust work is performed through the exhaust pipe 111.

[0039] refer to Figure 6 and Figure 7 When negative pressure is formed inside the exhaust pipe 111, negative pressure is formed inside the exhaust pipe 112 through the exhaust hole 1111 and the connecting hole 1110, thereby the adsorption valve block 114 moves downward. When the valve block 114 moves downward, the exhaust hole 119 is connected with the injection mold cavity, and the exhaust pipe 112 extracts the gas inside the injection mold cavity through the annular hole 118 and the exhaust hole 119. When the inside of the injection mold cavity tends to be hollow, the inside of the exhaust pipe 112 and the inside of the injection mold cavity tend to be balanced, and the valve block 114 returns upward under the action of the valve position spring 115, so that the valve block 114 blocks the exhaust hole 119, thereby completing the vacuum pumping of the injection mold cavity.

[0040] The injection mold cavity is evacuated through the exhaust pipe 112. When the vacuuming is completed, the air valve block 114 returns to its position, thereby completing the sealing of the exhaust hole 119, and the top surface of the air valve block 114 is flush with the cavity surface of the injection mold cavity, thereby effectively ensuring the flatness of the exhaust port, thereby improving the quality of the injection mold, and at the same time, the opening and closing of the exhaust hole 119 is controlled by the air valve block 114, thereby further achieving the effect of avoiding the exhaust hole 119 from being blocked.

[0041] Furthermore, the exhaust hole 119 is opened inside the guide groove 116. When the air valve block 114 seals the exhaust hole 119, the sealing effect of the exhaust hole 119 is effectively improved, thereby improving the sealing effect of the injection mold cavity. At the same time, the air valve block 114 moves downward to open and moves upward to close. The upward movement of the air valve block 114 can achieve the effect of clearing the exhaust hole 119, which can further prevent the exhaust hole 119 from being blocked.

[0042] refer to Fig. 9 In an optional embodiment, a limiting hole 1112 is opened inside the exhaust pipe 112, and the limiting hole 1112 is located at the bottom of the air valve block 114. The limiting hole 1112 is internally slidably connected to a limiting block 1113, and a blocking spring 1114 is arranged between the limiting block 1113 and the limiting hole 1112. Side connecting grooves 1116 are evenly opened on the outer side of the inner hole wall of the limiting hole 1112, and a side buffer groove 1117 is opened on the outer bottom of the limiting hole 1112.

[0043] Among them, the limit stopper 1113 is located at the bottom of the air valve block 114, and the limit stopper 1113 is used to limit the downward movement of the air valve block 114. An adjusting air hole 1115 is opened outside the limit hole 1112, and the adjusting air hole 1115 is used to connect the limit hole 1112 and the connecting air hole 1110.

[0044] It should be noted that the limit stop block 1113 is used to limit the downward movement of the air valve block 114, thereby further ensuring the stability of the air valve block 114 during the injection molding process, making the inner wall of the injection mold cavity tend to be flat, thereby improving the quality of injection molding, and effectively ensuring the stability of the exhaust hole 119 during the injection molding process, further avoiding the exhaust hole 119 from being blocked during the injection molding process, thereby reducing the difficulty of using and maintaining the mold and increasing its service life.

[0045] Specifically, the exhaust pipe 111 is evacuated through the exhaust hole 1111 and the connecting hole 1110, and the connecting hole 1110 generates negative pressure inside the limiting hole 1112 through the adjusting hole 1115, thereby adsorbing the limiting block 1113 to move toward the limiting hole 1112, and the limiting hole 1112 is connected to the exhaust pipe 112 through the side connecting groove 1116, which is located in the bottom cavity of the air valve block 114, thereby facilitating the generation of negative pressure inside the exhaust pipe 112, achieving the effect of adsorbing the air valve block 114 downward, and making the connecting hole 1110 connected to the injection mold cavity through the annular air hole 118 and the exhaust hole 119.

[0046] Furthermore, when the air pressure inside the injection mold cavity tends to be a vacuum, the air valve block 114 is reset under the action of the valve position spring 115, and when the air valve block 114 is reset, the vacuum assembly 12 can be controlled to inflate the exhaust pipe 112 to completely reset the air valve block 114, and the limit stop block 1113 is reset under the action of the stop spring 1114, and the control limit stop block 1113 is clamped at the bottom of the air valve block 114 again.

[0047] refer to Fig. 9 In an optional embodiment, a locator 1118 is disposed inside the limiting hole 1112 , and a positioning piece 1119 adapted to the locator 1118 is disposed outside the limiting block 1113 .

[0048] It should be noted that the positioner 1118 is used to adapt to the positioning piece 1119 , and the positioner 1118 is used to detect the position of the positioning piece 1119 , so as to ensure that the limit stopper 1113 can be stably engaged at the bottom of the limit stopper 1113 .

[0049] refer to Figure 8 In an optional embodiment, an adjusting pneumatic rod 133 is provided on the outside of the blocking block 131, and the driving end of the adjusting pneumatic rod 133 is fixedly connected to the blocking rod 134. The blocking block 131 is fixedly connected to the bottom of the blocking rod 134. A reset spring 132 is provided on the outside of the blocking block 131. In the initial state, the reset spring 132 controls the blocking block 131 to converge above the injection molding tube 10. The adjusting pneumatic rod 133 is used to control the blocking block 131 to move downward through the blocking rod 134. The inside of the blocking block 131 is provided with a second air pressure detector 135 for detecting other inside the injection mold cavity.

[0050] It should be noted that when the inside of the injection mold cavity is vacuumed, the pneumatic rod 133 is adjusted to control the sealing block 131 to move downward through the sealing rod 134, and the sealing block 131 is controlled to seal the injection plastic tube 10. By sealing the injection plastic tube 10, the vacuuming effect of the injection mold cavity is further improved. When the vacuuming is completed, the second air pressure detector 135 detects the internal air pressure value of the injection mold cavity. When the air pressure value is stable within the set time, the pneumatic rod 133 is adjusted to control the sealing block 131 to move upward through the sealing rod 134, so that the injection plastic tube 10 is connected, and the injection molding gun can inject the molten plastic into the injection mold cavity through the injection port 9.

[0051] After the injection molding is completed, the blocking block 131 can be controlled to move downward again, and the injection mold cavity and the injection molding gun are cut off by the blocking block 131, thereby effectively further improving the injection molding effect of the injection mold cavity and reducing the adhesion between the injection mold cavity and the injection molding gun, thereby ensuring the flatness of the injection molding inlet position of the precision grid floor.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A precision grid floor mold injection molding structure without welding marks, comprising a gantry (1), wherein an injection mold assembly is installed inside the gantry (1), characterized in that: The mold assembly comprises a fixed mold blank (6) and a movable mold blank (7), a grid floor injection mold cavity is formed between the fixed mold blank (6) and the movable mold blank (7), and an injection molding material tube (10) is arranged outside the fixed mold blank (6); The injection mold assembly further comprises an exhaust mechanism (11), a vacuum pumping assembly (12) and a sealing mechanism (13); The exhaust mechanism (11) is used to evacuate the injection mold cavity, the exhaust mechanism (11) comprises an exhaust pipe (111) fixedly connected to the fixed mold blank (6), the exhaust pipe (112) is fixedly connected to the outside of the exhaust pipe (111), the exhaust pipe (112) is connected to the injection mold cavity, and a connecting pipe (122) is provided on the outside of the vacuum extraction component (12), the connecting pipe (122) is connected to the exhaust pipe (111); The blocking mechanism (13) comprises a blocking block (131) inserted into the interior of the injection molding pipe (10), and the blocking block (131) is used to seal and isolate the injection molding pipe (10) from communication with the injection molding cavity.

2. According to claim 1, a precision grid floor mold injection molding structure without welding marks is characterized by: A spacer layer (8) is arranged outside the fixed mold base (6) and the movable mold base (7); the injection mold assembly further comprises a fixed mold base (2), a movable mold base (3), a fixed mold (4) and a movable mold (5); the fixed mold base (6) is embedded in the interior of the fixed mold (4); the movable mold base (7) is embedded in the interior of the movable mold (5); the spacer layer (8) is arranged between the fixed mold base (6), the movable mold base (7) and the fixed mold (4) and the movable mold (5); the fixed mold base (2) and the fixed mold (4) are fixedly connected; the vacuum extraction assembly (12) is installed outside the fixed mold base (2); and the outside of the fixed mold base (2) is fixedly connected with an injection port (9).

3. According to claim 2, a precision grid floor mold injection molding structure without welding marks is characterized by: The vacuum pumping component (12) comprises an indicator light (121), and an air filling tube (123) is arranged outside the vacuum pumping component (12).

4. According to claim 3, a precision grid floor mold injection molding structure without welding marks is characterized in that: A plurality of interconnected spacing grooves are provided between the spacing layers (8), cooling water pipes are installed inside the spacing grooves, the joints between the movable die blank (7) and the fixed die blank (6) are located inside the spacing grooves, the spacing grooves are connected to the inflation pipes (123), and a first air pressure detector (81) is provided inside the spacing grooves.

5. According to claim 1, a precision grid floor mold injection molding structure without welding marks is characterized by: The exhaust pipe (112) is fixedly connected to a guide rod (113) inside, the air valve block (114) is slidably connected to the outside of the guide rod (113), the outer diameter of the air valve block (114) is adapted to the inner diameter of the exhaust pipe (112), a guide groove (116) is provided on the side wall of the exhaust pipe (112), a valve position protrusion (117) is fixedly connected to the outside of the air valve block (114), the valve position protrusion (117) is slidably connected to the inside of the guide groove (116), an annular air hole (118) is provided inside the exhaust pipe (112), and the exhaust pipe (112) is provided with a guide groove (116). An exhaust hole (119) is provided inside the exhaust pipe (112) and is connected to the annular air hole (118) and the guide slide groove (116); a connecting air hole (1110) is provided inside the exhaust pipe (112) and is connected to the annular air hole (118); an exhaust hole (1111) is provided outside the connecting air hole (1110); the exhaust hole (1111) is used to connect the connecting air hole (1110) and the exhaust pipe (111); the exhaust pipe (112) is connected to the exhaust pipe (111) via the exhaust hole (119), the annular air hole (118), the connecting air hole (1110) and the exhaust hole (1111).

6. The precision grid floor mold injection molding structure without welding marks according to claim 5 is characterized by: A valve position spring (115) is provided between the air valve block (114) and the exhaust pipe (112); the air valve block (114) is used to block the exhaust hole (119); and the exhaust pipe (112) is used to communicate with the injection mold cavity.

7. The precision grid floor mold injection molding structure without welding marks according to claim 6 is characterized by: A limiting hole (1112) is provided inside the exhaust pipe (112), the limiting hole (1112) is located at the bottom of the air valve block (114), a limiting stopper (1113) is slidably connected inside the limiting hole (1112), a stopper spring (1114) is provided between the limiting stopper (1113) and the limiting hole (1112), side connecting grooves (1116) are evenly provided on the outside of the inner hole wall of the limiting hole (1112), and a side buffer groove (1117) is provided on the outside bottom of the limiting hole (1112).

8. The precision grid floor mold injection molding structure without welding marks according to claim 7 is characterized by: The limit stopper (1113) is located at the bottom of the air valve block (114), and the limit stopper (1113) is used to limit the downward movement of the air valve block (114). An adjusting air hole (1115) is provided outside the limit hole (1112), and the adjusting air hole (1115) is used to connect the limit hole (1112) and the connecting air hole (1110).

9. The precision grid floor mold injection molding structure without welding marks according to claim 7, characterized in that: A locator (1118) is disposed inside the limiting hole (1112), and a positioning piece (1119) adapted to the locator (1118) is disposed outside the limiting stopper (1113).

10. The precision grid floor mold injection molding structure without welding marks according to claim 1, characterized in that: The blocking block (131) is provided with an adjusting pneumatic rod (133) on the outside, the driving end of the adjusting pneumatic rod (133) is fixedly connected to the blocking rod (134), the blocking block (131) is fixedly connected to the bottom of the blocking rod (134), the blocking block (131) is provided with a return spring (132) on the outside, the return spring (132) controls the blocking block (131) to be gathered above the injection molded plastic tube (10) in the initial state, the adjusting pneumatic rod (133) is used to control the blocking block (131) to move downward through the blocking rod (134), and the blocking block (131) is provided with a second air pressure detector (135) for detecting other air pressures inside the injection mold cavity.

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