A low-pressure glue injection method and glue injection machine using LD-PE material

Abstract

The present application relates to the field of LD-PE material injection molding technology, and specifically to a low-pressure glue injection method and glue injection machine using LD-PE material, comprising the following steps: 1) delivering LD-PE glue liquid to a glue injection gun through a gear pump, 2) controlling the opening and closing of the glue injection gun through a fluid valve, 3) inserting the gun head of the glue injection gun into the edge of the water inlet of a forming mold or into the water inlet for glue injection; the forming mold is provided with a plug-in hole for inserting the gun head of the glue injection gun, the bottom of the plug-in hole is connected to the water inlet, and each two mold cavities of the forming mold correspond to a water inlet, and one water inlet corresponds to a plug-in hole, and the water inlet is located between two adjacent mold cavities and the two ends of the water inlet are connected to the opposite surfaces of the two mold cavities. The low-pressure glue injection method and glue injection machine realize low-pressure glue injection of LD-PE material, and greatly reduce the waste of raw materials caused by excessive water inlet material, and reduce the scrap rate of injection molded products, especially wiring harness products such as connectors and USB connectors.

Description

Technical Field

[0001] The present application relates to the technical field of LD-PE material injection molding, and in particular to a low-pressure glue injection method and a glue injection machine using LD-PE material. Background Art

[0002] At present, the connection between the wiring harness and the PCB board of electronic products needs to be injection molded and solidified through the injection molding process to form an encapsulation inner mold, so as to achieve the purpose of protecting the solder joints and connecting wires. It is particularly suitable for the inner mold encapsulation processing of the connection between the PCB board and the wiring harness of the USB male or female connector. The raw materials of the existing injection molding process are mainly LE-PE material and hot melt adhesive. LE-PE material is low in price (12.3 yuan / kg), high in hardness, has good protection performance for products and is widely used. The current wiring harness injection molding process uses LE-PE material, accounting for about 95%, and the rest uses more expensive hot melt adhesive. Although LE-PE material is of good quality and inexpensive, due to its high viscosity and hardness, the injection pressure required in the existing injection molding process is also extremely high. At the same time, the sprue of the existing molding mold adopts a tree-like sprue design with a single feed inlet and multiple branch sprues. The sprue length is long, which greatly increases the pressure required for LE-PE material injection molding. Under the action of high pressure, the liquid rubber forms a high-speed and high-pressure rubber fluid, which has a great impact on the fine wires and solder joints of the wiring harness. Therefore, the product scrap rate caused by the rubber fluid breaking the fine wires or solder joints has remained high. Some manufacturers use hot melt adhesive to reduce the pressure of the injection molding process, thereby reducing the scrap rate of the product. However, the price of hot melt adhesive is high (130 yuan / kg), and the hot melt adhesive is soft after curing and has low hardness. The protection of the wiring harness and solder joints at the connection is low. The connection is easily damaged during the use of the product, resulting in a short overall service life of the product. In addition, the existing low-pressure plastic machine using hot melt adhesive cannot achieve low pressure in the true sense. It can only achieve low pressure when using hot melt adhesive, and cannot use LE-PE material for low-pressure injection molding. The above problems have become one of the important factors restricting the development of wiring harness connectors. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present application is to provide a low-pressure injection method using LD-PE material. The low-pressure injection method is connected to the plug hole of the mold, the length of the nozzle of the molding mold is extremely short, and a single nozzle corresponds to a single plug hole. During injection molding, the gun head of the injection gun is inserted into the plug hole and the front end of the gun head is inserted into the edge of the nozzle or into the nozzle for injection molding. Compared with the existing injection molding method that uses a single feed port and a tree-shaped nozzle to simultaneously inject multiple mold cavities with a single feed port, the total length of the nozzle of the present application is only one tenth of that of the existing mold with the same number of acupoints, which greatly reduces the pressure required for injection of LD-PE material, realizes low-pressure injection of LD-PE material, and greatly reduces the waste of raw materials caused by excessive nozzle material.

[0004] The purpose of the present application is achieved through the following technical solution: A low-pressure glue injection method using LD-PE material, comprising the following steps: 1) delivering LD-PE glue liquid to a glue injection gun through a gear pump, 2) controlling the opening and closing of the glue injection gun through a fluid valve, 3) extending the gun head of the glue injection gun into the edge of the water outlet of the molding mold or into the water outlet for glue injection;

[0005] The molding mold is provided with a plug-in hole for inserting the gun head of the glue injection gun, the bottom of the plug-in hole is connected with a water outlet, every two mold cavities of the molding mold correspond to a water outlet, and one water outlet corresponds to a plug-in hole. The water outlet is located between two adjacent mold cavities and the two ends of the water outlet are connected to the opposite surfaces of the two mold cavities.

[0006] The length of the water outlet is less than 2 cm, the plug hole is connected to the middle of the water outlet, and after the gun head is inserted into the plug hole, the side of the gun head fits tightly with the inner wall of the plug hole, and the end of the gun head is located at the edge of the water outlet or in the middle of the water outlet.

[0007] A low-pressure glue injection machine using LD-PE material should have the low-pressure glue injection method using LD-PE material as described above, including a workbench, a molding mold arranged on the workbench, a glue injection gun arranged above the molding mold, a vertical linear module for driving the glue injection gun to rise and fall in the vertical direction, and a transverse linear module for driving the vertical linear module to move laterally, the molding mold includes an upper mold and a lower mold, the lower mold is provided with a plurality of lower mold cavities, the upper mold is provided with a plurality of upper mold cavities corresponding to the lower mold cavities, and also includes a water outlet connected between two adjacent upper mold cavities and or between two adjacent lower mold cavities, the upper mold is also provided with a plug hole for the glue injection gun to extend into the upper side edge of the water outlet to complete the glue injection, the lower end of the plug hole is connected to the water outlet, and the number of the plug holes corresponds to the number of the water outlets.

[0008] The plug-in hole is composed of a main circular hole, an inverted cone shrinkage hole, an assembly hole, and a glue injection hole which are connected in sequence, and the lower end of the glue injection hole is communicated with the water inlet.

[0009] A positioning module for fixing the end of the product to be injected is sandwiched between the upper mold and the lower mold, and the positioning module is provided with a plurality of positioning holes for inserting the end of the product to be injected toward the upper mold cavity and / or the lower mold cavity; it also includes a limit bar for pressing down the product to be injected, and the lower end surface of the limit bar is provided with a plurality of limit grooves cooperating with the product to be injected.

[0010] It also includes an opening and closing drive mechanism for driving the upper mold and the lower mold to complete mold closing, the opening and closing drive mechanism includes an upper cross plate, at least two guide pillars arranged parallel to each other, a sleeve sleeved outside the guide pillars, a lower cross plate, and a lifting motor or a lifting cylinder, the upper mold is fixed to the upper cross plate, the upper end of the guide pillar is fixedly connected to the upper cross plate, the lower end of the guide pillar is fixedly connected to the lower cross plate, and the output end of the lifting motor or the lifting cylinder is connected to the lower cross plate.

[0011] The glue injection gun includes a pneumatic valve, a gun head fixed to the glue outlet end of the pneumatic valve, a solenoid valve for controlling the opening and closing of the pneumatic valve, and a glue heater for keeping the glue liquid warm. The pneumatic valve includes a valve body, a front end cover fixed to the front end of the valve body, and a rear end cover fixed to the rear end of the valve body. The front end cover is provided with a valve glue outlet, and also includes a valve needle arranged in the valve body for controlling the opening and closing of the valve glue outlet. The valve body is provided with a valve glue inlet for the glue liquid to enter, and the valve glue inlet is connected to the liquid outlet end of the glue heater. A cylinder body is provided in the valve body, and a piston assembly is provided in the cylinder body. The rear end of the valve needle is fixedly connected to the piston assembly. The valve body is provided with a valve air inlet, and the valve air inlet is communicated with the front end of the cylinder body. The valve air inlet is communicated with the air outlet end of the solenoid valve, and also includes a high-rebound component sandwiched between the piston assembly and the rear end surface of the cylinder body, and also includes a gear pump for conveying glue. The liquid inlet end of the glue heater is connected with a gland, and the gland is connected to the liquid outlet end of the gear pump.

[0012] The piston assembly includes a lower tensioning plate, an upper tensioning plate and a soft rubber sealing body, the soft rubber sealing body is formed by an upper rubber cap and a lower rubber cap with openings facing opposite directions, the upper tensioning plate is sleeved in the upper rubber cap, and the upper tensioning plate is sleeved outside the valve needle, the lower tensioning plate is sleeved in the lower rubber cap, and also includes a T-shaped ring, the T-shaped ring is sleeved outside the valve needle, and the lower tensioning plate is sleeved outside the T-shaped ring.

[0013] The high-rebound component is a high-rebound compression spring or a high-rebound soft rubber component.

[0014] The high-resilience soft rubber part is formed by integrally forming a soft rubber sleeve body and two anti-crack rings, and the two anti-crack rings respectively cover the two end surfaces of the soft rubber sleeve body.

[0015] The beneficial effects of the present application are as follows: the low-pressure glue injection method of the present application is opened in the connection between the plug-in hole of the mold and the sprue, the sprue length of the molding mold is extremely short, and a single sprue is designed to correspond to a single plug-in hole. During injection molding, the gun head of the glue injection gun is inserted into the plug-in hole and the front end of the gun head is inserted into the edge of the sprue or into the sprue for injection molding. Compared with the existing injection molding method that uses a single feed port in combination with a tree-like sprue to simultaneously inject multiple mold cavities with a single feed port, the total length of the sprue of the present application is only one-tenth of that of the existing mold with the same number of acupoints, which greatly reduces the pressure required for injection of LD-PE material, realizes low-pressure injection of LD-PE material, and greatly reduces the waste of raw materials caused by excessive sprue material.

[0016] The molding die of the low-pressure glue injection machine using LD-PE material of the present application adopts a multi-plug-in hole glue injection molding method. Compared with the existing injection molding method that uses a single feed port with a tree-shaped water inlet to simultaneously inject multiple mold cavities with a single feed port, the injection molding method of the present application with multiple plug-in holes and multiple water outlets, in which one plug-in hole is connected to a corresponding water outlet, can reduce the length of the water outlet to a minimum. The total length of the water outlet of the present application is often less than one-tenth of the existing mold with the same number of holes for LE-PE material, which greatly reduces the waste of raw materials caused by excessive water outlet material and greatly reduces The pressure required for LE-PE material injection molding realizes low-pressure injection molding, thereby solving the problem of high product scrap rate caused by the rubber fluid breaking the fine wire or breaking the welding point, greatly improving production efficiency and economic benefits. In the existing multi-cavity injection molding with a single feed inlet and a tree-shaped sprue, a bundle of sprue materials corresponds to multiple molded products, and the sprue materials are adhered to multiple products, making it extremely inconvenient to cut off the sprue. In the present application, one sprue corresponds to two products and the two ends of the sprue are respectively connected to one side of the two products. It is simple and convenient to cut off, and it is not easy to damage the molded products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a stereogram of the present application;

[0018] Figure 2 It is a schematic diagram of the main structure of this application;

[0019] Figure 3 It is a three-dimensional diagram of the vertical linear module, the lateral linear module and the glue injection gun of the present application;

[0020] Figure 4 is a stereogram of the glue injection gun of the present application;

[0021] Figure 5is a three-dimensional diagram of the opening and closing drive mechanism and the forming mold of the present application;

[0022] Figure 6 is a cross-sectional view of the molding die of the present application;

[0023] Figure 7 is a cross-sectional view of the pneumatic valve and the gun head of the present application;

[0024] Figure 8 is an exploded view of the molding die of the present application;

[0025] Fig. 9 is another exploded view of the molding die of the present application;

[0026] Fig.10 is a schematic structural diagram of a gun tip of Example 2 of the present application;

[0027] Fig.11 is a schematic diagram of the structure of the plug socket of Example 2 of the present application;

[0028] Fig.12 is a three-dimensional diagram of the soft adhesive sealant of the present application;

[0029] Fig.13 It is a three-dimensional diagram of the high-resilience soft rubber part of the present application.

[0030] The accompanying drawings are marked as: workbench 1, molding mold 2, glue injection gun 3, vertical linear module 4, lateral linear module 5, upper mold 6, lower mold 7, lower mold cavity 8, upper mold cavity 9, water inlet 10, plug hole 11, positioning module 12, positioning hole 13, limit strip 14, limit groove 15, lower assembly groove 16, upper assembly groove 17, alignment column 18, alignment hole 19, opening and closing drive mechanism 20, upper cross plate 21, guide column 22, sleeve 23, lower cross plate 24, lifting motor or lifting cylinder 25, pneumatic valve 26, gun head 27, solenoid valve 28, glue heater 29, valve body 30, front cover 31, rear cover 32, valve glue outlet 33, valve needle 34, valve glue inlet 35, cylinder body 36, valve air inlet 37, high resilience part 38, gland 39, lower tensioning plate 40, upper tensioning plate 41, soft rubber seal 42, upper rubber cap 43, lower rubber cap 44, T-ring 45, travel limit block 46, travel limit bolt 47, high resilience soft rubber part 48, soft rubber sleeve body 49, anti-crack ring 50, air outlet pipe 51, main circular hole 52, inverted cone shrinkage hole 53, assembly hole 54, glue injection hole 55, guide cylinder 56, limit inverted cone 57, middle cylinder 58, glue injection cone head 59, frame 60, controller 61, alarm light 62, casing 63. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of those skilled in the art, the following embodiments and attached Figure 1-Figure 13To further illustrate the present application, the contents mentioned in the implementation mode are not intended to limit the present application.

[0032] Example 1

[0033] A low-pressure glue injection method using LD-PE material, comprising the following steps: 1) delivering LD-PE glue liquid to a glue injection gun through a gear pump, 2) controlling the opening and closing of the glue injection gun through a fluid valve, 3) extending the gun head of the glue injection gun into the edge of the water outlet of a forming mold or into the water outlet for glue injection;

[0034] The molding mold is provided with a plug-in hole for inserting the gun head of the glue injection gun, the bottom of the plug-in hole is connected with a water outlet, every two mold cavities of the molding mold correspond to a water outlet, and one water outlet corresponds to a plug-in hole. The water outlet is located between two adjacent mold cavities and the two ends of the water outlet are connected to the opposite surfaces of the two mold cavities.

[0035] The length of the water outlet is less than 2 cm, the plug hole is connected to the middle of the water outlet, and after the gun head is inserted into the plug hole, the side of the gun head fits tightly with the inner wall of the plug hole, and the end of the gun head is located at the edge of the water outlet or in the middle of the water outlet.

[0036] A low-pressure glue injection machine using LD-PE material should have the low-pressure glue injection method using LD-PE material as described above, including a workbench 1, a molding mold 2 arranged on the workbench 1, a glue injection gun 3 arranged above the molding mold 2, a vertical linear module 4 for driving the glue injection gun 3 to rise and fall along the vertical direction, and a transverse linear module 5 for driving the vertical linear module 4 to move horizontally, the molding mold 2 includes an upper mold 6 and a lower mold 7, the lower mold 7 is provided with a plurality of lower mold cavities 8, the upper mold 6 is provided with a plurality of upper mold cavities 9 corresponding to the lower mold cavities 8, and also includes a water outlet 10 connected between two adjacent upper mold cavities 9 and or between two adjacent lower mold cavities 8, the upper mold 6 is also provided with a plug hole 11 for the glue injection gun 3 to extend into the upper side edge of the water outlet 10 to complete the glue injection, the lower end of the plug hole 11 is connected to the water outlet 10, and the number of the plug holes 11 corresponds to the number of the water outlets 10.

[0037] A positioning module 12 for fixing the end of the product to be injected is sandwiched between the upper mold 6 and the lower mold 7. The positioning module 12 is provided with a plurality of positioning holes 13 for inserting the end of the product to be injected on the side facing the upper mold cavity 9 and / or the lower mold cavity 8; it also includes a limiting strip 14 for pressing down the product to be injected, and the lower end face of the limiting strip 14 is provided with a plurality of limiting grooves 15 that cooperate with the product to be injected.

[0038] The lower mold 7 is provided with a lower assembly groove 16, and the upper mold 6 is provided with an upper assembly groove 17. The lower half of the positioning module 12 is located in the lower assembly groove 16. After the mold is closed, the upper half of the positioning module 12 is inserted into the upper assembly groove 17; the limit groove 15 is located between the upper mold cavity 9 and the positioning hole 13, and the limit strip 14 is fixed to the upper mold 6; the lower mold 7 is fixed with a mold alignment column 18, and the upper mold 6 is provided with a mold alignment hole 19 for the mold alignment column 18 to be inserted.

[0039] Specifically, the product to be molded can be a connector with a wiring harness, a USB female / male connector with a wiring harness, a Type-C female / male connector with a wiring harness, or other connectors with a wiring harness. In the actual application of the present application, the end of the product to be molded is inserted into the positioning hole 13 of the positioning module 12 to complete the initial positioning. After the mold is closed, the limiting strip 14 and the limiting groove 15 perform secondary positioning on the part of the product to be molded that is adjacent to the opening of the positioning hole 13. The positioning stability is good, and the product to be molded is not easy to loosen or shift after being impacted by the liquid glue, thereby ensuring the molding quality of the product to be molded.

[0040] It also includes an opening and closing drive mechanism 20 for driving the upper mold 6 and the lower mold 7 to complete mold closing, the opening and closing drive mechanism 20 includes an upper cross plate 21, at least two guide pillars 22 arranged parallel to each other, a sleeve 23 sleeved outside the guide pillars 22, a lower cross plate 24, and a lifting motor or a lifting cylinder 25. The upper mold 6 is fixed to the upper cross plate 21, the upper end of the guide pillar 22 is fixedly connected to the upper cross plate 21, the lower end of the guide pillar 22 is fixedly connected to the lower cross plate 24, and the output end of the lifting motor or the lifting cylinder 25 is connected to the lower cross plate 24.

[0041] The glue injection gun 3 includes a pneumatic valve 26, a gun head 27 fixed to the glue outlet end of the pneumatic valve 26, a solenoid valve 28 for controlling the opening and closing of the pneumatic valve 26, and a glue heater 29 for keeping the glue liquid warm. The pneumatic valve 26 includes a valve body 30, a front end cover 31 fixed to the front end of the valve body 30, and a rear end cover 32 fixed to the rear end of the valve body 30. The front end cover 31 is provided with a valve glue outlet 33, and also includes a valve needle 34 arranged in the valve body 30 for controlling the opening and closing of the valve glue outlet 33. The valve body 30 is provided with a valve glue inlet 35 for the glue liquid to enter, and the valve glue inlet 35 is connected to the glue liquid. The liquid outlet end of the heater 29 is connected, a cylinder 36 is arranged in the valve body 30, a piston assembly is arranged in the cylinder body 36, the rear end of the valve needle 34 is fixedly connected to the piston assembly, the valve body 30 is provided with a valve air inlet 37, the valve air inlet 37 is communicated with the front end of the cylinder body 36, the valve air inlet 37 is communicated with the air outlet end of the solenoid valve 28, and also includes a high-rebound part 38 clamped between the rear end surface of the piston assembly and the cylinder body 36, and also includes a gear pump for conveying glue liquid, the liquid inlet end of the glue liquid heater 29 is connected with a gland 39, and the gland 39 is connected to the liquid outlet end of the gear pump.

[0042] Specifically, the glue outlet end of the gear pump is connected to the gland 39 through a pipeline.

[0043] The piston assembly includes a lower tensioning plate 40, an upper tensioning plate 41 and a soft rubber sealing body 42. The soft rubber sealing body 42 is formed by an upper rubber cap 43 and a lower rubber cap 44 whose openings face oppositely. The upper tensioning plate 41 is sleeved in the upper rubber cap 43, and the upper tensioning plate 41 is sleeved outside the valve needle 34. The lower tensioning plate 40 is sleeved in the lower rubber cap 44, and also includes a T-shaped ring 45. The T-shaped ring 45 is sleeved outside the valve needle 34, and the lower tensioning plate 40 is sleeved outside the T-shaped ring 45.

[0044] The glue injection gun 3 of the present application controls the opening and closing of the airflow entering the valve air inlet 37 of the pneumatic valve 26 through the solenoid valve 28, and then drives the piston assembly to move toward the rear end of the cylinder body 36 through the pressure of the airflow itself, thereby driving the valve needle 34 to move backward, and then the valve needle 34 opens the valve glue outlet 33, and the LD-PE glue of the glue heater 29 enters the valve through the valve glue inlet 35 and then flows out through the valve glue outlet 33 into the gun head 27 for glue injection. When it is necessary to stop glue injection, the solenoid valve 28 stops supplying air to the valve air inlet 37 and exhausts the air, and the piston assembly quickly rebounds to the initial position under the action of the high rebound member 38, closing the valve glue outlet 33. The solenoid valve 28 and the pneumatic valve 26 cooperate to control the injection molding of the LD-PE glue, and can accurately control the single injection amount of the LD-PE glue, with high control accuracy and good stability. The LD-PE glue that is about to enter the pneumatic valve 26 for injection is heated and kept warm by the glue heater 29, which can ensure that the glue is at the optimal injection temperature and flow state, reduce the resistance of the LD-PE glue flowing through each component, make the injection smoother, and effectively reduce the pressure required for the LD-PE glue injection, thereby realizing low-pressure injection.

[0045] In actual application, under the action of the high rebound member 38, the upper tensioning plate 41 is subjected to the forward squeezing force of the high rebound member 38, the piston assembly is maintained at the front end of the cylinder body 36, and the pneumatic valve 26 is in a closed state. When glue injection is required, the solenoid valve 28 works and sends the constant-pressure airflow through the valve air inlet 37 into the front end of the cylinder body 36. The constant-pressure airflow squeezes the lower tensioning plate 40 backward, thereby driving the valve needle 34 to move backward, the valve glue outlet 33 is opened, and the glue injection work begins. When the glue injection needs to be stopped, the solenoid valve 28 stops supplying the constant-pressure airflow to the valve air inlet 37 and exhausts the air. Under the action of the high rebound member 38, the piston assembly resets and closes the valve glue outlet 33. The piston assembly of the present application adopts a structural design of a soft rubber seal 42 in cooperation with a lower tensioning plate 40 and an upper tensioning plate 41. The soft rubber seal 42 is formed by an upper rubber cap 43 and a lower rubber cap 44 with openings facing opposite directions, and cooperates with the lower tensioning plate 40 and the upper tensioning plate 41. The tightness between the piston and the cylinder 36 is good, and the airtightness is excellent. In the existing pneumatic valve 26, each piston and the cylinder 36 are sealed by a gasket. The airtightness of a single piston is low and it is easy to leak, so that the opening and closing accuracy of the pneumatic valve 26 cannot be guaranteed. In order to overcome this defect, the existing pneumatic valve 26 adopts a combination structure of multiple pistons arranged alternately to ensure the stability of the opening and closing accuracy. However, the structural design of multiple pistons is not only costly but also too long for the cylinder, which is not conducive to the application of miniaturized equipment. The structural design of the piston assembly of the present application effectively improves the tightness and stability of the piston assembly and the cylinder, and is less prone to air leakage. The pneumatic valve 26 can achieve high-precision opening and closing by using a single piston in conjunction with a cylinder, which greatly shortens the length of the pneumatic valve 26 and is conducive to miniaturized applications.

[0046] The valve needle 34 is provided with a stroke limit block 46 for limiting the maximum forward movement of the valve needle 34; it also includes a stroke limit bolt 47 for limiting the maximum backward movement of the valve needle 34, the end of the stroke limit bolt 47 passes through the rear end cover 32 and extends into the rear section of the cylinder body 36, and the end of the stroke limit bolt 47 is located directly behind the rear end of the valve needle 34, and the stroke limit bolt is threadedly connected to the rear end cover 32.

[0047] The high-rebound component 38 is a high-rebound compression spring or a high-rebound soft rubber component 48 .

[0048] The high-resilience soft rubber part 48 is formed by integrally forming a soft rubber sleeve body 49 and two anti-crack rings 50, and the two anti-crack rings 50 respectively cover the two end surfaces of the soft rubber sleeve body 49. The anti-crack ring 50 is a circle of threaded soft rubber ring.

[0049] The design of the anti-crack ring 50 allows a buffer groove to be formed at the connection between the anti-crack ring 50 and the soft rubber sleeve body 49 after the soft rubber sleeve body 49 and the two anti-crack rings 50 are integrally formed, thereby alleviating the damage to the soft rubber sleeve body 49 caused by the extrusion force in the axial direction. At the same time, the existence of the anti-crack ring 50 can form a certain pulling force in the circumferential direction, thereby reducing the deformation in the circumferential direction when the soft rubber sleeve body 49 is squeezed, thereby preventing the end of the soft rubber sleeve body 49 from cracking.

[0050] The air outlet end of the solenoid valve 28 is connected to an air outlet pipe 51 , and the air outlet pipe 51 is connected to the valve air inlet 37 through the glue heater 29 .

[0051] Specifically, the plug-in hole 11 gradually shrinks from top to bottom, and a glue injection hole 55 is formed at the bottom end of the plug-in hole 11, and the lower end of the glue injection hole 55 is connected to the water outlet 10; the shape of the gun head 27 adopts an inverted cone structure design, and the outer diameter of the smallest end of the gun head 27 is smaller than the aperture of the glue injection hole 55. In actual application, the gun head 27 is inserted into the plug-in hole 11, and the front end of the gun head 27 is inserted into the glue injection hole 55. When the gun head 27 is inserted into place, the side of the gun head 27 and the upper end of the glue injection hole 55 are closed, and glue injection begins.

[0052] Specifically, the lateral linear module 5 is fixed to the workbench 1, and further comprises a frame 60, a controller 61, an alarm light 62 and a housing 63. The workbench 1 is arranged in the middle of the frame 60, and the alarm light 62 is arranged on the top of the frame 60. The alarm light 62, the vertical linear module 4, the lateral linear module 5, the lifting motor or the lifting cylinder 25, the solenoid valve 28, the glue heater 29, and the gear pump are electrically connected to the controller 61, respectively.

[0053] Example 2

[0054] The difference between this embodiment and embodiment 1 is that:

[0055] The plug-in hole 11 is composed of a main circular hole 52 , an inverted cone shrinkage hole 53 , an assembly hole 54 , and a glue injection hole 55 which are connected in sequence. The lower end of the glue injection hole 55 is connected to the water inlet 10 .

[0056] Specifically, the two ends of the nozzle 10 are respectively connected to the opposite sides of two adjacent upper mold cavities 9 and or two adjacent lower mold cavities 8. The aperture of the main circular hole 52 is equal to the maximum aperture of the inverted cone shrinkage hole 53, the minimum aperture of the inverted cone shrinkage hole 53 is equal to the aperture of the assembly hole 54, the aperture of the injection hole 55 is smaller than the aperture of the assembly hole 54, and the depth of the injection hole 55 is less than 0.5 cm.

[0057] The gun head 27 is composed of a guide cylinder 56, a limiting inverted cone 57, a middle cylinder 58, and a glue injection cone head 59 which are connected in sequence. In actual application, the guide cylinder 56 cooperates with the main circular hole 52 of the plug-in hole 11 to complete the guiding positioning of the gun head 27, the limiting inverted cone 57 cooperates with the inverted cone shrinkage hole 53 of the plug-in hole 11 to complete the insertion stroke limit of the gun head 27, and at the same time enhances the airtightness of the gun head 27 and the plug-in hole 11, the middle cylinder 58 cooperates with the assembly hole 54 to perform a secondary alignment operation to ensure the matching accuracy, and at the same time completes the closure of the glue injection hole 55, further enhancing the airtightness between the gun head 27 and the plug-in hole 11, and the glue injection cone head 59 is inserted into the glue injection hole 55 for glue injection.

[0058] The above embodiments are preferred implementation schemes of the present application. In addition, the present application may also be implemented in other ways. Any obvious replacement without departing from the concept of the present application is within the protection scope of the present application.

Claims

1. A low-pressure glue injection method using LD-PE material, characterized in that: The invention relates to a low-pressure glue injection machine using LD-PE material, which comprises a workbench, a molding die arranged on the workbench, a glue injection gun arranged above the molding die, a vertical linear module for driving the glue injection gun to rise and fall in a vertical direction, and a lateral linear module for driving the vertical linear module to move laterally, wherein the molding die comprises an upper die and a lower die, wherein the lower die is provided with a plurality of lower die cavities, the upper die is provided with a plurality of upper die cavities corresponding to the lower die cavities, and further comprises a water inlet connected between two adjacent upper die cavities and or between two adjacent lower die cavities, the upper die is further provided with a plug hole for the glue injection gun to extend into the upper side edge of the water inlet to complete glue injection, the lower end of the plug hole is connected with the water inlet, and the number of the plug holes corresponds to the number of the water inlets; The method comprises the following steps: 1) delivering LD-PE glue liquid to a glue injection gun through a gear pump; 2) controlling the opening and closing of the glue injection gun through a fluid valve; 3) inserting the gun head of the glue injection gun into the edge of the water inlet of a forming mold or into the water inlet for glue injection; the forming mold is provided with a plug hole for inserting the gun head of the glue injection gun, the bottom of the plug hole is connected with the water inlet, every two mold cavities of the forming mold correspond to one water inlet, one water inlet corresponds to one plug hole, the water inlet is located between two adjacent mold cavities, and the two ends of the water inlet are respectively connected with the opposite surfaces of the two mold cavities; The plug-in hole is composed of a main circular hole, an inverted cone shrinkage hole, an assembly hole, and a glue injection hole which are connected in sequence, and the lower end of the glue injection hole is connected to the water inlet; A positioning module for fixing the end of the product to be injected is sandwiched between the upper mold and the lower mold, and the positioning module is provided with a plurality of positioning holes for inserting the end of the product to be injected on one side of the upper mold cavity and / or the lower mold cavity; and also includes a limit bar for pressing down the product to be injected, and the lower end surface of the limit bar is provided with a plurality of limit grooves that cooperate with the product to be injected; The glue injection gun includes a pneumatic valve, a gun head fixed to the glue outlet end of the pneumatic valve, a solenoid valve for controlling the opening and closing of the pneumatic valve, and a glue heater for glue liquid insulation. The pneumatic valve includes a valve body, a front end cover fixed to the front end of the valve body, and a rear end cover fixed to the rear end of the valve body. The front end cover is provided with a valve glue outlet, and also includes a valve needle arranged in the valve body for controlling the opening and closing of the valve glue outlet. The valve body is provided with a valve glue inlet for glue liquid to enter, and the valve glue inlet is connected to the liquid outlet end of the glue heater. A cylinder body is provided in the valve body, and a piston assembly is provided in the cylinder body. The rear end of the valve needle is fixedly connected to the piston assembly. The valve body is provided with a valve air inlet, and the valve air inlet is communicated with the front end of the cylinder body. The valve air inlet is communicated with the air outlet end of the solenoid valve, and also includes a high-rebound member sandwiched between the piston assembly and the rear end surface of the cylinder body, and also includes a gear pump for conveying glue. The liquid inlet end of the glue heater is connected with a gland, and the gland is connected to the liquid outlet end of the gear pump; The piston assembly includes a lower tensioning plate, an upper tensioning plate and a soft rubber sealing body, the soft rubber sealing body is formed by an upper rubber cap and a lower rubber cap with openings facing opposite directions, the upper tensioning plate is sleeved in the upper rubber cap, and the upper tensioning plate is sleeved outside the valve needle, the lower tensioning plate is sleeved in the lower rubber cap, and also includes a T-shaped ring, the T-shaped ring is sleeved outside the valve needle, and the lower tensioning plate is sleeved outside the T-shaped ring.

2. A low-pressure glue injection method using LD-PE material according to claim 1, characterized in that: The length of the water outlet is less than 2 cm, the plug hole is connected to the middle of the water outlet, and after the gun head is inserted into the plug hole, the side of the gun head fits tightly with the inner wall of the plug hole, and the end of the gun head is located at the edge of the water outlet or in the middle of the water outlet.

3. A low-pressure glue injection machine using LD-PE material, characterized in that: The low-pressure glue injection method using LD-PE material as described in any one of claims 1-2 should be provided, comprising a workbench, a molding die arranged on the workbench, a glue injection gun arranged above the molding die, a vertical linear module for driving the glue injection gun to rise and fall in the vertical direction, and a transverse linear module for driving the vertical linear module to move transversely, the molding die comprises an upper die and a lower die, the lower die is provided with a plurality of lower die cavities, the upper die is provided with a plurality of upper die cavities corresponding to the lower die cavities, and also comprises a water inlet connected between two adjacent upper die cavities and or between two adjacent lower die cavities, the upper die is also provided with a plug hole for the glue injection gun to extend into the upper side edge of the water inlet to complete the glue injection, the lower end of the plug hole is connected with the water inlet, and the number of the plug holes corresponds to the number of the water inlets; The plug-in hole is composed of a main circular hole, an inverted cone shrinkage hole, an assembly hole, and a glue injection hole which are connected in sequence, and the lower end of the glue injection hole is connected to the water inlet; A positioning module for fixing the end of the product to be injected is sandwiched between the upper mold and the lower mold, and the positioning module is provided with a plurality of positioning holes for inserting the end of the product to be injected on one side of the upper mold cavity and / or the lower mold cavity; and also includes a limit bar for pressing down the product to be injected, and the lower end surface of the limit bar is provided with a plurality of limit grooves that cooperate with the product to be injected; The glue injection gun includes a pneumatic valve, a gun head fixed to the glue outlet end of the pneumatic valve, a solenoid valve for controlling the opening and closing of the pneumatic valve, and a glue heater for glue liquid insulation. The pneumatic valve includes a valve body, a front end cover fixed to the front end of the valve body, and a rear end cover fixed to the rear end of the valve body. The front end cover is provided with a valve glue outlet, and also includes a valve needle arranged in the valve body for controlling the opening and closing of the valve glue outlet. The valve body is provided with a valve glue inlet for glue liquid to enter, and the valve glue inlet is connected to the liquid outlet end of the glue heater. A cylinder body is provided in the valve body, and a piston assembly is provided in the cylinder body. The rear end of the valve needle is fixedly connected to the piston assembly. The valve body is provided with a valve air inlet, and the valve air inlet is communicated with the front end of the cylinder body. The valve air inlet is communicated with the air outlet end of the solenoid valve, and also includes a high-rebound member sandwiched between the piston assembly and the rear end surface of the cylinder body, and also includes a gear pump for conveying glue. The liquid inlet end of the glue heater is connected with a gland, and the gland is connected to the liquid outlet end of the gear pump; The piston assembly includes a lower tensioning plate, an upper tensioning plate and a soft rubber sealing body, the soft rubber sealing body is formed by an upper rubber cap and a lower rubber cap with openings facing opposite directions, the upper tensioning plate is sleeved in the upper rubber cap, and the upper tensioning plate is sleeved outside the valve needle, the lower tensioning plate is sleeved in the lower rubber cap, and also includes a T-shaped ring, the T-shaped ring is sleeved outside the valve needle, and the lower tensioning plate is sleeved outside the T-shaped ring.

4. A low-pressure glue injection machine using LD-PE material according to claim 3, characterized in that: It also includes an opening and closing drive mechanism for driving the upper mold and the lower mold to complete mold closing, the opening and closing drive mechanism includes an upper cross plate, at least two guide pillars arranged parallel to each other, a sleeve sleeved outside the guide pillars, a lower cross plate, and a lifting motor or a lifting cylinder, the upper mold is fixed to the upper cross plate, the upper end of the guide pillar is fixedly connected to the upper cross plate, the lower end of the guide pillar is fixedly connected to the lower cross plate, and the output end of the lifting motor or the lifting cylinder is connected to the lower cross plate.

5. A low-pressure glue injection machine using LD-PE material according to claim 3, characterized in that: The high-rebound component is a high-rebound compression spring or a high-rebound soft rubber component.

6. A low-pressure glue injection machine using LD-PE material according to claim 5, characterized in that: The high-resilience soft rubber part is formed by integrally forming a soft rubber sleeve body and two anti-crack rings, and the two anti-crack rings respectively cover the two end surfaces of the soft rubber sleeve body.

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