Electric tool rubber coating nylon shell injection molding equipment and injection molding process thereof

Abstract

The invention relates to the technical field of rubber coating injection molding, in particular to electric tool rubber coating nylon shell injection molding equipment and an injection molding process thereof.The electric tool rubber coating nylon shell injection molding equipment comprises an injection molding machine table and a partition plate installed on the injection molding machine table in a sliding mode, a melting bin is further arranged on the injection molding machine table, and a feeding hopper is arranged on the melting bin; the static mold is installed on the injection molding machine table, a mold core is arranged on the static mold, a feeding runner penetrating through the mold core is formed in the static mold, and the melting bin communicates with a screw feeding pipe; the mold closing mechanism is arranged on the injection molding machine table, a movable mold is connected to the mold closing mechanism, and a mold cavity and an air supply cavity are formed in the movable mold; the conduction regulation and control mechanism is arranged in the movable mold and is connected with the mold closing mechanism; the ejection mechanism is arranged on the movable mold and matched with the cavity, and an ejection plate is connected to the ejection mechanism; and the air pressure balance mechanism is arranged on the ejection mechanism, and can eliminate negative pressure generated when the product is demoulded by controlling the opening and closing of the cavity, so that the product can be ensured to be smoothly separated from the cavity.

Description

Technical Field

[0001] The invention relates to the technical field of rubber-coated injection molding, in particular to an electric tool rubber-coated nylon shell injection molding device and an injection molding process thereof. Background Art

[0002] When producing power tools such as electric drills, it is usually necessary to encapsulate the battery and the outer shell of the hand grip. The reason is that the encapsulation material usually has a soft texture, which can increase the contact comfort between the human hand and the power tool shell, reduce hand fatigue when holding the tool for a long time, and enable the user to operate the power tool more easily.

[0003] The main function of the rubber coating treatment is to increase the feel, comfort, and appearance; although the rubber coating treatment cannot completely play a water-proof and waterproof function, it can also prevent water and moisture from entering the interior of the power tool to a certain extent, reduce the probability of internal components getting rusty, corroded or short-circuited, and enable the power tool to be used normally in a slightly humid environment, thereby improving its reliability and durability.

[0004] Therefore, when encapsulating the battery shell of the electric tool, the shell can be placed in an injection mold and encapsulated by mold closing injection molding. During the encapsulation process, the molten raw material is injected into the closed mold cavity, and after cooling, the product fits tightly against the cavity surface. If the product is directly ejected from the cavity, the air between the product and the cavity cannot be replenished in time, which leads to negative pressure between the product and the cavity. Under the action of negative pressure suction, the product may be deformed or broken due to tension when it is demolded. Summary of the invention

[0005] The object of the present invention is to provide an electric tool nylon shell injection molding device and an injection molding process thereof to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: An electric tool rubber-coated nylon shell injection molding device, comprising: An injection molding machine platform, and a partition slidably mounted on the injection molding machine platform, wherein the injection molding machine platform is also provided with a melting bin, and a feeding hopper is provided on the melting bin; Also includes: A static mold is mounted on the injection molding machine, the static mold is provided with a core, a feeding channel penetrating the core is provided in the static mold, and a screw feeding pipe fixedly connected to the static mold and connected to the feeding channel is connected to the melting chamber; A mold clamping mechanism is arranged on the injection molding machine, the mold clamping mechanism is connected to a movable mold, a mold cavity and an air supply chamber are formed on the movable mold, and the mold clamping mechanism can drive the movable mold to move toward or away from the static mold to adjust the matching state between the mold cavity and the core; A conduction regulating mechanism, disposed in the movable mold and connected to the mold clamping mechanism, for regulating the conduction state of the cavity; An ejection mechanism is arranged on the movable mold and cooperates with the cavity. The ejection mechanism is connected to an ejection plate. The ejection mechanism can drive the ejection plate to move toward or away from the cavity when the movable mold moves. The air pressure balance mechanism is arranged on the ejection mechanism, and the air pressure balance mechanism can perform an air supply action into the movable mold through the ejection mechanism when the mold clamping mechanism moves.

[0007] As a further solution of the present invention: the mold clamping mechanism includes guide columns installed on the injection molding machine and symmetrically arranged, a support plate is slidably installed on the guide columns, a cylinder fixedly connected to the support plate is arranged on the injection molding machine, and an elastic support component is arranged on the support plate.

[0008] As a further solution of the present invention: the elastic support assembly includes a support rod installed on the support plate, the support rod is slidably connected to the movable mold, and a first spring is sleeved on the support rod, and two ends of the first spring are respectively abutted against the support plate and the movable mold.

[0009] As a further solution of the present invention: the conduction and regulation mechanism includes a limit groove and a conduction hole formed in the movable mold, the limit groove is connected to the air supply chamber, and a sealing component cooperating with the limit groove and the conduction hole is provided on the support rod.

[0010] As a further solution of the present invention: the sealing assembly includes a sealing ring installed at the end of the support rod, the sealing ring is slidably matched with the limiting groove, and a sealing gasket is provided on the sealing ring to slidably match with the conducting hole.

[0011] As a further solution of the present invention: the ejection mechanism includes a limit plate installed on the guide column, a groove connected to the cavity is formed on the movable mold, an air supply kettle is arranged on the movable mold, a fixed plate is arranged in the air supply kettle, and a driven component is arranged in the air supply kettle.

[0012] As a further solution of the present invention: the driven component includes a push rod slidably mounted on the movable mold and passing through the air supply kettle, the push rod is provided with a first limiting ring and a second limiting ring, the end of the push rod is provided with an ejector plate, the ejector plate is slidably matched with the groove, the push rod is sleeved with a second spring, and the two ends of the second spring are respectively abutted against the first limiting ring and the fixed plate.

[0013] As a further solution of the present invention: the air pressure balance mechanism includes an air inlet pipe and an air supply pipe connected to the circumferential side wall of the air supply kettle, the air supply pipe passes through the movable mold and is connected to the air supply chamber, and an air supply component is arranged in the air supply kettle.

[0014] As a further solution of the present invention: the gas supply assembly includes a slot provided on the push rod, a piston disc slidably mounted on the push rod and connected to the gas supply kettle in a sliding and sealing manner, a fixing rod slidably connected to the push rod is provided on the support plate, and a limiting block slidably connected to the slot and abutting against the piston disc is provided on the fixing rod; It also includes a third spring sleeved on the push rod, and two ends of the third spring are respectively in contact with the fixing plate and the piston disc.

[0015] An injection molding process for a nylon housing of an electric tool includes the following steps: Step 1: Place the required rubber-coated shell on the core of the static mold, and push the dynamic mold toward the static mold under the action of the mold clamping mechanism; Step 2: When the cavity and the core are matched, the conducting control mechanism performs a blocking action on the cavity; Step 3: At this time, the raw material can be transported to the gap formed by the core and the cavity through the screw feeding pipe through the feeding channel. When the encapsulation is completed, the clamping mechanism controls the moving mold to move away from the static mold; Step 4: Under the action of the conduction regulating mechanism, the cavity is made conductive, so that air is supplied to the movable mold through the air pressure balance mechanism, so that a positive pressure is formed between the product and the cavity. At the same time, the ejection mechanism controls the ejection plate to separate from the cavity, so as to eject the product smoothly from the cavity.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present application can control the connection between the cavity and the air supply chamber before the product is ejected from the cavity, and provide the product with a multi-point positive pressure thrust, so as to ensure that no negative pressure is generated when the product is separated from the cavity during the process of the ejector plate ejecting the product from the cavity, so as to ensure that the product will not be deformed or broken due to the negative pressure suction. Specifically, under the action of the clamping mechanism, the movable mold and the static mold are controlled to abut against each other, and in this process, the cavity is controlled to be in a blocked state through the conduction regulating mechanism. When the encapsulation is completed, the clamping mechanism controls the movable mold to move away from the static mold. At the same time, under the action of the conduction regulating mechanism, the cavity and the air supply chamber are connected to each other. Under the action of the air pressure leveling mechanism, a multi-point positive pressure thrust is provided to the product through the conduction hole to eliminate the negative pressure generated when the product is separated from the cavity. Finally, under the action of the ejection mechanism, the product is ejected from the cavity through the ejector plate. Through the cooperation of the ejector plate and the air pressure thrust, the product can be completely separated from the cavity.

[0017] By controlling the relative movement of the support plate and the movable mold, the movement of the piston disk can be controlled to provide positive pressure to the air supply chamber and the through hole when the through hole is turned on, thereby preventing the product from being deformed or broken due to negative pressure when it leaves the cavity.

[0018] By controlling the relative movement between the ejector plate and the movable mold, the product can be automatically ejected from the cavity after the overmolding is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a structural schematic diagram of an embodiment of an injection molding device for a nylon shell of an electric tool.

[0020] Figure 2 This is a structural schematic diagram from another angle of an embodiment of an electric tool nylon shell injection molding device.

[0021] Figure 3 The present invention is a schematic diagram of the connection relationship between the mold clamping mechanism, the moving mold, and the static mold in one embodiment of an injection molding device for a nylon housing covered with rubber for electric tools.

[0022] Figure 4 This is a structural schematic diagram of a mold clamping mechanism, an ejector plate, and a movable mold in one embodiment of an injection molding device for a nylon housing covered with rubber for electric tools.

[0023] Figure 5 The present invention is a schematic diagram of the cross-sectional structure of a movable mold in one embodiment of an injection molding device for a nylon housing covered with rubber for electric tools.

[0024] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at point A in the middle.

[0025] Figure 7This is a schematic diagram of the connection relationship between the mold clamping mechanism, part of the ejection mechanism, and part of the air pressure balancing mechanism in an embodiment of an electric tool nylon shell injection molding device.

[0026] Figure 8 This is a schematic diagram of a partial half-section structure of an embodiment of an electric tool nylon shell injection molding device.

[0027] Fig. 9 The present invention is a schematic diagram of the exploded structure of an ejection mechanism and a part of the air pressure balance mechanism in one embodiment of an injection molding device for a nylon housing covered with rubber for electric tools.

[0028] Fig.10 This is a structural schematic diagram of part of the ejection mechanism and part of the air pressure balance mechanism in an embodiment of an injection molding device for a nylon housing covered with rubber for electric tools.

[0029] In the figure: 1, injection molding machine; 2, partition; 3, melting chamber; 4, feeding hopper; 5, screw feeding pipe; 6, static mold; 601, feeding channel; 602, guide hole; 7, core; 8, guide column; 9, support plate; 10, cylinder; 11, support rod; 12, sealing ring; 1201, sealing pad; 13, first spring; 14, dynamic mold; 1401, air delivery chamber; 1402, limit groove; 14 03, through hole; 1404, groove; 15, limit column; 16, limit plate; 17, air supply kettle; 18, fixed plate; 19, push rod; 1901, slot; 20, first limit ring; 21, second limit ring; 22, ejector plate; 23, second spring; 24, piston disc; 25, third spring; 26, fixed rod; 2601, limit block; 27, air inlet pipe; 28, air supply pipe; 29, cavity. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0032] See also Figure 1 to Figure 10In an embodiment of the present invention, a nylon shell injection molding device for electric tool includes: An injection molding machine 1, and a partition 2 slidably mounted on the injection molding machine 1, a melting bin 3 is further provided on the injection molding machine 1, and a feeding hopper 4 is provided on the melting bin 3; Also includes: A static mold 6 is installed on the injection molding machine 1. A core 7 is provided on the static mold 6. A feeding channel 601 penetrating the core 7 is provided in the static mold 6. A screw feeding pipe 5 fixedly connected to the static mold 6 and connected to the feeding channel 601 is connected to the melting chamber 3. Among them, the interior of the screw feeding tube 5 is integrated with an electric heating wire, which mainly plays the role of heating and feeding; the screw feeding is similar to the auger feeding principle, which will not be repeated here.

[0033] A mold clamping mechanism is arranged on the injection molding machine 1, and a movable mold 14 is connected to the mold clamping mechanism. A cavity 29 and an air supply chamber 1401 are formed on the movable mold 14. The mold clamping mechanism can drive the movable mold 14 to move toward or away from the static mold 6 to adjust the matching state between the cavity 29 and the core 7; A conduction regulating mechanism, which is disposed in the movable mold 14 and connected to the mold clamping mechanism, and is used to adjust the conduction state of the cavity 29; An ejection mechanism is disposed on the movable mold 14 and cooperates with the cavity 29. The ejection mechanism is connected to an ejection plate 22. The ejection mechanism can drive the ejection plate 22 to move toward or away from the cavity 29 when the movable mold 14 moves. The air pressure balancing mechanism is arranged on the ejection mechanism, and the air pressure balancing mechanism can perform an air supply action into the movable mold 14 through the ejection mechanism when the mold clamping mechanism moves.

[0034] Specifically, when the product is encapsulated, the product can be placed on the core 7. At this time, the movable mold 14 is controlled by the mold clamping mechanism to move toward the static mold 6, and when the cavity 29 cooperates with the core 7, the conduction regulating mechanism will control the cavity 29 to be blocked. At this time, the screw feeding pipe 5 can inject the raw material into the cavity formed by the core 7 and the cavity 29 through the feeding channel 601. When the encapsulation is completed, under the action of the mold clamping mechanism, the movable mold 14 is controlled to move in the direction away from the static mold 6. At the same time, under the action of the conduction regulating mechanism, the cavity 29 is made conductive, and the air pressure balancing machine Under the action of the structure, after positive pressure is formed in the air supply chamber 1401, under the action of the ejection mechanism, the ejection plate 22 is controlled to separate from the cavity 29, so that the product is pushed out of the cavity 29. By adjusting the air pressure in the cavity 29 and the air supply chamber 1401 before the ejection plate 22 is ejected, it is possible to avoid the formation of negative pressure between the product and the cavity 29 due to the failure to replenish air in time when the product is separated from the cavity 29. When the ejection plate 22 forcibly ejects the product, the product is partially adsorbed in the cavity 29 due to the negative pressure suction, which causes the product to be deformed or the stress is too large, resulting in breakage.

[0035] See also Figure 1-Figure 5 , Figure 7 The mold clamping mechanism includes a guide column 8 installed on the injection molding machine 1 and symmetrically arranged, a support plate 9 is slidably installed on the guide column 8, a cylinder 10 fixedly connected to the support plate 9 is provided on the injection molding machine 1, and an elastic support component is provided on the support plate 9, wherein the elastic support component includes a support rod 11 installed on the support plate 9, the support rod 11 is slidably connected to the movable mold 14, and a first spring 13 is sleeved on the support rod 11, and the two ends of the first spring 13 are respectively abutted against the support plate 9 and the movable mold 14.

[0036] In detail, a limiting column 15 is provided on the movable mold 14, and a guide hole 602 cooperating therewith is opened on the static mold 6. In the initial state, the first spring 13 is in a pre-compression state, so that the distance between the movable mold 14 and the support plate 9 is maximized, and under the action of the conduction regulating mechanism, it is ensured that the movable mold 14 will not be separated from the guide column 8. Under the action of the cylinder 10, the distance between the support plate 9 and the static mold 6 is maximized, so that the distance between the movable mold 14 and the static mold 6 is maximized. At this time, the injection molded shell can be placed on the core 7 of the static mold 6, and the cylinder 10 works and pushes the support plate 9 to move along the length direction of the guide column 8 and move toward the static mold 6. The support plate 9 will also move through the support rod 11 and the first The spring 13 drives the movable mold 14 to move synchronously. When the limit column 15 on the movable mold 14 is inserted into the guide hole 602, it can further ensure that the movable mold 14 will not deviate during movement. When the movable mold 14 and the static mold 6 abut against each other, the movable mold 14 no longer moves. At this time, the cylinder 10 controls the support plate 9 to continue to move, and controls the movement of the conduction and regulation mechanism to seal the cavity 29. At the same time, the first spring 13 is compressed to increase the fitting pressure of the movable mold 14 on the static mold 6 to ensure that a closed chamber is formed between the cavity 29 and the injection molding shell. At this time, the raw material can be transported to the feeding channel 601 through the screw feeding pipe 5, and enter the sealed chamber through the feeding channel 601 to encapsulate the shell.

[0037] Preferably, by compressing and releasing the first spring 13, the distance between the support plate 9 and the movable mold 14 can be increased or decreased, so that the conduction or blocking of the cavity 29 can be adjusted by the conduction control mechanism, thereby facilitating subsequent encapsulation and demolding.

[0038] See also Figure 5-Figure 7 The conduction and regulation mechanism includes a limit groove 1402 and a conduction hole 1403 formed in the movable mold 14, the limit groove 1402 is connected to the air supply chamber 1401, and a sealing component cooperating with the limit groove 1402 and the conduction hole 1403 is provided on the support rod 11, wherein the sealing component includes a sealing ring 12 installed at the end of the support rod 11, the sealing ring 12 is slidably matched with the limit groove 1402, and a sealing gasket 1201 is provided on the sealing ring 12 to slide with the conduction hole 1403.

[0039] It should be noted that, in the initial state, the first spring 13 is in a pre-compression state, so that the movable mold 14 has a tendency to move toward and away from the support plate 9, so that the sealing ring 12 is located at the end of the stroke away from the limiting groove 1402 and abuts against the inner wall of the air supply chamber 1401. At this time, under the action of the limiting groove 1402 and the guide hole 1403, the air supply chamber 1401 is connected with the cavity 29. When the cylinder 10 controls the support plate 9 to move toward the static mold 6, under the action of the first spring 13, the movable mold 14 is controlled to move synchronously. When the movable mold 14 and the static mold 6 are fitted with each other, the movable mold 14 no longer moves. At this time, the support plate 9 continues to move and controls the sealing ring 12 to move toward the limiting groove 1402 through the support rod 11, thereby driving the sealing gasket 1201 to move. When the sealing gasket 1201 is inserted into the guide hole 1403 and is on the same reference plane as the vertical surface of the bottom of the cavity 29, the sealing ring 12 just moves to the end of the stroke in the limit groove 1402. At this time, the cavity 29 and the air supply chamber 1401 are in a blocked state, ensuring that the raw material will not flow into the air supply chamber 1401 during the overmolding. When the injection molding is completed, the cylinder 10 will control the support plate 9 to move in the direction away from the static mold 6. At this time, the first spring 13 is elastically released, so that the movable mold 14 remains in a fit state with the static mold 6, and the support rod 11 will move synchronously with the support plate 9, thereby driving the sealing ring 12 and the sealing gasket 1201 to move in the air supply chamber 1401. When the sealing gasket 1201 is separated from the conducting hole 1403, the cavity 29 and the air supply chamber 1401 are connected again. When the sealing ring 12 abuts against the inner wall of the air supply chamber 1401, the support rod 11 will drive the movable mold 14 to move in the direction away from the static mold 6 through the sealing ring 12, and under the action of the ejection mechanism and the ejection plate 22, the product is separated from the cavity 29.

[0040] Preferably, by controlling the conduction state of the through hole 1403, the cavity 29 can be kept in a blocked state during the overmolding. After the overmolding is completed, by controlling the conduction of the through holes 1403 at multiple points, and under the action of the air pressure balance mechanism, a positive pressure is formed in the air supply chamber 1401 to ensure that when the ejector plate 22 ejects the product from the cavity 29, no negative pressure is formed between the product and the cavity 29. At the same time, under the action of air pressure, thrust can be provided at multiple points formed by the through holes 1403 to further assist in product demolding, thereby avoiding problems such as product deformation or damage during demolding.

[0041] See also Figure 4 , Figure 5 , Figure 7-Figure 10The ejection mechanism includes a limit plate 16 installed on the guide column 8, a groove 1404 connected to the cavity 29 is formed on the movable mold 14, an air supply kettle 17 is provided on the movable mold 14, a fixed plate 18 is provided in the air supply kettle 17, and a driven component is provided in the air supply kettle 17, wherein the driven component includes a push rod 19 slidably installed on the movable mold 14 and passing through the air supply kettle 17, a first limit ring 20 and a second limit ring 21 are provided on the push rod 19, an ejection plate 22 is provided at the end of the push rod 19, the ejection plate 22 is slidably matched with the groove 1404, and a second spring 23 is sleeved on the push rod 19, and the two ends of the second spring 23 are respectively abutted against the first limit ring 20 and the fixed plate 18.

[0042] Further, in the initial state, under the action of the cylinder 10, the distance between the support plate 9 and the static mold 6 is maximized, and the second spring 23 is in a compressed state, so that the first limit ring 20 and the movable mold 14 are in abutment state, so that the ejection plate 22 and the groove 1404 are controlled to be in a separated state through the push rod 19. At this time, the distance between the second limit ring 21 and the limit plate 16 is the largest. When the cylinder 10 pushes the support plate 9 to move, the movable mold 14 will move toward the static mold 6, thereby driving the ejection plate 22 to move synchronously. Under the action of the push rod 19, the second limit ring 21 is controlled to move toward the limit plate 16. When the second limit ring 21 moves to the position abutting against the limit plate 16, the movable mold 14 is about to abut against the static mold 6, and the movable mold 14 continues to move. Since the push rod 19 no longer moves, the first limit ring 20 will separate from the movable mold 14 and compress the second spring 23. At the same time, the distance between the ejector plate 22 and the groove 1404 gradually decreases until the ejector plate 22 completely enters the groove 1404 and abuts against the inner wall of the groove 1404. The movable mold 14 also moves to the position abutting against the static mold 6, and the support plate 9 continues to move until the sealing gasket 1201 blocks the conducting hole 1403. At this time, overmolding can be performed.

[0043] Preferably, the size of the ejector plate 22 is comparable to that of the groove 1404, and the ejector plate 22 can completely enter the groove 1404 and fit completely with the groove 1404. Therefore, during the overmolding, the ejector plate 22 will not affect the overmolding. After the overmolding is completed, the support plate 9 first moves in a direction away from the static mold 6, and under the action of the sealing gasket 1201 and the through hole 1403, the through hole 1403 is connected to ensure that no negative pressure is formed when the product is separated from the cavity 29. When the movable mold 1 When the push rod 19 moves synchronously with the support plate 9, the second spring 23 is elastically released, so that the push rod 19 does not move, so that the ejection plate 22 is separated from the groove 1404, thereby ejecting the product from the cavity 29. When the first limit ring 20 abuts against the movable mold 14 again, the push rod 19 moves synchronously with the movable mold 14 until the support plate 9 returns to the initial position. By controlling the relative movement between the ejection plate 22 and the movable mold 14, the effect of automatically ejecting the product from the cavity 29 can be achieved after the overmolding is completed.

[0044] See also Figure 5 , Figure 7-Figure 10 The air pressure balancing mechanism includes an air inlet pipe 27 and an air supply pipe 28 connected to the circumferential side wall of the air supply kettle 17, the air supply pipe 28 passes through the movable mold 14 and is connected to the air supply chamber 1401, and an air supply component is arranged in the air supply kettle 17, wherein the air supply component includes a slot 1901 opened on the push rod 19, a piston disk 24 which is slidably mounted on the push rod 19 and is slidably connected to the air supply kettle 17 and is sealed, a fixing rod 26 which is slidably connected to the push rod 19 is arranged on the support plate 9, and a limit block 2601 which is slidably connected to the slot 1901 and abuts against the piston disk 24 is arranged on the fixing rod 26; and also includes a third spring 25 which is sleeved on the push rod 19, and the two ends of the third spring 25 are respectively abutted against the fixing plate 18 and the piston disk 24.

[0045] Furthermore, a plurality of one-way valves are installed on the air delivery kettle 17, which are respectively connected to the air inlet pipe 27 and the air delivery pipe 28, so that the gas can only enter the air delivery kettle 17 through the air inlet pipe 27 and be released into the air delivery chamber 1401 through the air delivery pipe 28. In the initial state, the distance between the movable mold 14 and the support plate 9 is the largest, so that the size of the mutual fit between the fixed rod 26 and the push rod 19 is the smallest, so that the limit block 2601 is located at the end of the stroke of the slot 1901 away from the movable mold 14 side, and the third spring 25 is in a compressed state, so that the piston disc 24 abuts against the limit block 2601. When the movable mold 14 abuts against the static mold 6, the movable mold 14 no longer moves. At this time, the support plate 9 continues to move, so that the fixed rod 26 moves toward the push rod 19 to pass through the limit block 2601. The piston disc 24 is pushed to move and the third spring 25 is compressed. Under the action of the piston disc 24, the outside air is sucked into the air delivery kettle 17 through the air inlet pipe 27. At this time, overmolding can be performed. After the overmolding is completed, the support plate 9 will first move in the direction away from the static mold 6, so that the fixed rod 26 moves in the direction away from the push rod 19, so that the limit block 2601 is separated from the piston disc 24. The third spring 25 is elastically released, so that the piston disc 24 moves toward the initial position, so as to push the air in the air delivery kettle 17 into the air delivery chamber 1401 through the air delivery pipe 28, so as to form a positive pressure at the position of the guide hole 1403. When the movable mold 14 moves synchronously with the support plate 9, the limit block 2601 is reset, and under the action of air pressure and the ejector plate 22, the product is controlled to leave the cavity 29.

[0046] Preferably, by controlling the relative movement of the support plate 9 and the movable mold 14, the movement of the piston disk 24 can be controlled, so that when the through hole 1403 is turned on, positive pressure is provided to the air supply chamber 1401 and the through hole 1403, thereby preventing the product from being deformed or broken due to negative pressure when it leaves the cavity 29.

[0047] An injection molding process for a nylon housing of an electric tool includes the following steps: Step 1: Place the required rubber-coated shell on the core 7 of the static mold 6, and push the dynamic mold 14 toward the static mold 6 under the action of the mold clamping mechanism; Step 2: When the cavity 29 is matched with the core 7, the conducting control mechanism performs a blocking action on the cavity 29; Step 3: At this time, the raw material can be delivered to the gap formed by the core 7 and the cavity 29 through the screw feeding pipe 5 through the feeding channel 601. When the encapsulation is completed, the clamping mechanism controls the movable mold 14 to move away from the static mold 6. Step 4: Under the action of the conduction regulating mechanism, the cavity 29 is made conductive, so that air is supplied to the movable mold 14 through the air pressure balance mechanism, so that a positive pressure is formed between the product and the cavity. At the same time, the ejection mechanism controls the ejection plate 22 to separate from the cavity 29, so as to eject the product from the cavity 29 smoothly.

[0048] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An injection molding device for a nylon housing of an electric tool, comprising: An injection molding machine (1), and a partition (2) slidably mounted on the injection molding machine (1), wherein the injection molding machine (1) is further provided with a melting bin (3), and the melting bin (3) is provided with a feed hopper (4); It is characterized by further comprising: A stationary mold (6) is mounted on the injection molding machine (1); a core (7) is disposed on the stationary mold (6); a feeding channel (601) penetrating the core (7) is provided in the stationary mold (6); and a screw feeding pipe (5) is connected to the melting chamber (3) and is fixedly connected to the stationary mold (6) and connected to the feeding channel (601); A mold clamping mechanism is arranged on the injection molding machine (1), the mold clamping mechanism is connected to a movable mold (14), the movable mold (14) is formed with a mold cavity (29) and an air supply chamber (1401), and the mold clamping mechanism can drive the movable mold (14) to move toward or away from the static mold (6) to adjust the matching state between the mold cavity (29) and the mold core (7); A conduction regulating mechanism, disposed in the movable mold (14) and connected to the mold clamping mechanism, and used for regulating the conduction state of the mold cavity (29); an ejection mechanism, arranged on the movable mold (14) and cooperating with the mold cavity (29), the ejection mechanism being connected to an ejection plate (22), and the ejection mechanism being capable of driving the ejection plate (22) to move in a direction approaching or away from the mold cavity (29) when the movable mold (14) moves; A pneumatic balance mechanism is arranged on the ejection mechanism, and the pneumatic balance mechanism can perform an air supply action into the movable mold (14) through the ejection mechanism when the mold clamping mechanism moves.

2. The electric tool nylon shell injection molding equipment according to claim 1, characterized in that: The mold clamping mechanism comprises guide columns (8) mounted on the injection molding machine (1) and arranged symmetrically, a support plate (9) being slidably mounted on the guide columns (8), a cylinder (10) fixedly connected to the support plate (9) being arranged on the injection molding machine (1), and an elastic support component being arranged on the support plate (9).

3. The electric tool nylon shell injection molding equipment according to claim 2, characterized in that: The elastic support assembly comprises a support rod (11) mounted on the support plate (9), the support rod (11) being slidably connected to the movable die (14), a first spring (13) being sleeved on the support rod (11), and two ends of the first spring (13) respectively abutting against the support plate (9) and the movable die (14).

4. The electric tool nylon shell injection molding equipment according to claim 3, characterized in that: The conduction regulating mechanism comprises a limit groove (1402) and a conduction hole (1403) formed in the movable mold (14); the limit groove (1402) is connected to the air supply chamber (1401); and a sealing component cooperating with the limit groove (1402) and the conduction hole (1403) is provided on the support rod (11).

5. The electric tool nylon shell injection molding equipment according to claim 4, characterized in that: The sealing assembly comprises a sealing ring (12) mounted on the end of the support rod (11), the sealing ring (12) slidably cooperates with the limiting groove (1402), and a sealing gasket (1201) slidably cooperates with the conducting hole (1403) is provided on the sealing ring (12).

6. The electric tool nylon shell injection molding equipment according to claim 2, characterized in that: The ejection mechanism comprises a limit plate (16) mounted on the guide column (8), a groove (1404) connected to the cavity (29) is formed on the movable mold (14), an air supply kettle (17) is arranged on the movable mold (14), a fixing plate (18) is arranged in the air supply kettle (17), and a driven component is arranged in the air supply kettle (17).

7. The electric tool nylon shell injection molding equipment according to claim 6, characterized in that: The driven component comprises a push rod (19) which is slidably mounted on the movable mold (14) and passes through the air supply kettle (17); a first limiting ring (20) and a second limiting ring (21) are provided on the push rod (19); an ejector plate (22) is provided at the end of the push rod (19); the ejector plate (22) is slidably engaged with the groove (1404); a second spring (23) is sleeved on the push rod (19); two ends of the second spring (23) are respectively in contact with the first limiting ring (20) and the fixed plate (18).

8. The electric tool nylon shell injection molding equipment according to claim 7, characterized in that: The air pressure balancing mechanism comprises an air inlet pipe (27) and an air supply pipe (28) connected to the circumferential side wall of the air supply kettle (17); the air supply pipe (28) passes through the movable mold (14) and is connected to the air supply chamber (1401); and an air supply component is arranged in the air supply kettle (17).

9. The electric tool nylon shell injection molding equipment according to claim 8, characterized in that: The gas supply assembly comprises a slot (1901) provided on the push rod (19); a piston disc (24) slidably mounted on the push rod (19) and connected in a slidable and sealing manner to the gas supply kettle (17); a fixing rod (26) slidably connected to the push rod (19) is provided on the support plate (9); and a stopper (2601) slidably connected to the slot (1901) and abutting against the piston disc (24) is provided on the fixing rod (26); It also includes a third spring (25) sleeved on the push rod (19), with two ends of the third spring (25) respectively abutting against the fixing plate (18) and the piston disc (24).

10. An injection molding process for a nylon shell of an electric tool, using the nylon shell injection molding equipment for an electric tool as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: placing the required rubber-coated shell on the core (7) of the static mold (6), and under the action of the mold clamping mechanism, pushing the dynamic mold (14) toward the static mold (6); Step 2: When the mold cavity (29) and the mold core (7) are matched, the conducting control mechanism performs a blocking action on the mold cavity (29); Step 3: At this time, the raw material can be delivered to the gap formed by the core (7) and the cavity (29) through the screw feeding pipe (5) through the feeding channel (601). When the encapsulation is completed, the clamping mechanism controls the movable mold (14) to move in a direction away from the static mold (6); Step 4: Under the action of the conduction regulating mechanism, the cavity (29) is made conductive, so that air is supplied to the movable mold (14) through the air pressure balance mechanism, so that a positive pressure is formed between the product and the cavity. At the same time, the ejection mechanism controls the ejection plate (22) to separate from the cavity (29) so that the product can be ejected smoothly from the cavity (29).

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