Electric control screw temperature control device

Abstract

The utility model discloses an electric control screw temperature control device which comprises a device shell, a PLC control motor, a planetary reducer, a driving shaft and a driving gear positioning ring. The number of the electrically-controlled screw temperature control devices is one or more, and the electrically-controlled screw temperature control devices are in a circular ring shape on the whole and are connected to the outside of the plasticizing charging barrel in a sleeving mode. The device shell is fixed on the plasticizing charging barrel shell through a bolt and / or a bracket to wrap internal components, so that the internal components are protected, and the influence of an external environment on the device is prevented; the PLC control motor is installed on the upper portion of the device shell. The output end of the planetary reducer is connected with the driving shaft, and the driving shaft penetrates through the device shell and the device shell from the outside of the device shell.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molding and relates to an electric-controlled screw temperature control device, which is suitable for high-precision and high-efficiency injection molding operations. Background Art

[0002] Injection molding equipment is widely used in the production of plastic or rubber products. Its performance directly affects product quality and production efficiency. Existing injection molding equipment has the following deficiencies in mold positioning and screw temperature control:

[0003] Low mold positioning system accuracy: Traditional mold positioning systems typically use mechanical limiters or simple sensors for positioning. This approach is inaccurate and susceptible to mechanical wear and environmental changes, leading to positioning errors. Positioning errors can affect the dimensional accuracy and appearance quality of the product, especially when producing high-precision plastic or rubber products.

[0004] Screw temperature control system hysteresis and instability: Existing screw temperature control systems often use traditional electric heaters and simple temperature controllers. These systems exhibit hysteresis in temperature control and are unable to quickly respond to temperature changes. Furthermore, the temperature control system's poor accuracy and stability can easily lead to uneven temperatures during the melting process of plastics or rubber, thus affecting product quality. This is particularly true when producing plastic or rubber products made from different materials. The hysteresis and instability of the temperature control system can prevent the material's full performance from being realized.

[0005] Low production efficiency: Due to the lack of precision and efficiency in mold positioning and screw temperature control systems, existing injection molding equipment requires frequent adjustments and corrections during the production process, resulting in low production efficiency. This not only increases production costs but also prolongs production cycles, which is detrimental to the company's competitiveness.

[0006] High energy consumption: Traditional screw temperature control systems are inefficient and waste a lot of energy during the heating process, increasing production costs. In today's increasingly stringent environmental protection requirements, high-energy-consuming equipment will face more restrictions and challenges.

[0007] Complex operation and difficult maintenance: Existing injection molding equipment typically requires highly skilled operators to perform adjustments and maintenance when problems arise. This not only increases labor costs but also limits the widespread adoption and application of the equipment. During operation, operators must constantly monitor and adjust various parameters to ensure smooth production. This complex operational process increases the potential for error and places high demands on the operator's expertise. Utility Model Content

[0008] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide an electrically controlled screw temperature control device to improve the positioning accuracy and temperature control stability of the equipment, thereby improving production efficiency and product quality.

[0009] The utility model provides an electric-controlled screw temperature control device, comprising a device housing, a PLC control motor, a planetary reducer, a drive shaft, a drive gear, a driven gear, a positioning ring, a solid pin, and a hollow pin;

[0010] The electric screw temperature control device includes one or more devices, which are generally annular and sleeved on the outside of the plasticizing barrel;

[0011] The device housing is fixed to the sleeve variable pitch plasticizing screw by bolts and / or brackets, wrapping the internal components to protect the internal components and prevent the external environment from affecting the device;

[0012] The PLC control motor is installed above the device casing; a motor support plate is also fixed on the PLC control motor, and the motor support plate is fixed to the device casing by bolts, providing a stable support platform for the PLC control motor; the motor support plate can support and fix the PLC control motor, absorb vibration, and ensure that the motor remains stable during operation; the PLC control motor is directly connected to the plasticizing screw, and a flat plate is set to level the position.

[0013] The output end of the PLC control motor is connected to the planetary reducer, the input shaft of the planetary reducer is connected to the output shaft of the PLC control motor through a coupling, and the body of the planetary reducer is fixed to the motor support plate or fixed bracket by bolts;

[0014] The output end of the planetary reducer is connected to the drive shaft, which passes through the device housing and a positioning ring provided inside the device housing from the outside of the device housing, extends into the device housing, and the end is connected to the drive gear;

[0015] The output speed of the PLC-controlled motor is adjusted by the planetary reducer and then drives the drive gear to rotate via the drive shaft;

[0016] A plurality of driven gears are provided on both sides of the driving gear, and the driving gear and the driven gear or the driven gears are meshed in sequence; the driving gear or the driven gear is a helical bevel gear;

[0017] The positioning ring is set inside the device housing and is concentric with the device housing. Hollow pins and solid pins are sequentially set on multiple driven gears on both sides of the driving gear. The hollow pins and solid pins are arranged at intervals. The angle between the driving shaft and two adjacent hollow pins is 30 degrees, and the angle between two adjacent hollow pins and solid pins is 30 degrees.

[0018] One end of the solid pin is rotatably connected to the positioning ring, and the other end is fixedly connected to the driven gear as the driving shaft of the driven gear; the hollow pin includes a hollow rotating sleeve, a driven temperature control shaft, and a temperature control head. One end of the hollow rotating sleeve of the hollow pin is rotatably connected to the positioning ring, and the other end passes through the axis of the driven gear and is inserted into the plasticizing barrel. A thread is provided between the driven temperature control shaft and the temperature control head, which can be rotated in and out on the wall of the plasticizing barrel to change the insertion depth of the temperature control head in the plasticizing barrel; a temperature sensor is provided on the temperature control head, which can monitor the rubber temperature in the plasticizing barrel in real time.

[0019] The gear rim of the helical bevel gear is tapered, and the tooth line is inclined relative to the gear axis, which can mesh with another gear of similar shape. Since the tooth line is inclined relative to the gear axis, the contact area of ​​the gear meshing is increased, and the transmission smoothness and load capacity are improved. During the transmission process, it has efficient power transmission capabilities and can withstand large torques, realizing the diversion and transmission of power between the driving gear and the driven gear or between the driven gears.

[0020] When the temperature control head detects that the temperature of the rubber in the plasticizing barrel does not reach the preset temperature, the PLC controls the motor, the motor output shaft rotates, the planetary reducer adjusts the speed of the motor output shaft output, and drives the driving gear to rotate through the driving shaft, and the driving gear drives the driven gear to rotate, and the hollow pin fixedly connected to several of the driven gears is screwed into the plasticizing barrel. Preferably, when the temperature control head is partially inserted into the spiral line position of the plasticizing screw, it is equivalent to encrypting the spiral line. When the spiral line is encrypted, the contact area between the screw and the rubber increases, and at the same time, the flow path of the rubber inside the screw becomes shorter, the flow rate increases, the flow resistance increases, the internal pressure rises, and the shear force on the rubber also increases;

[0021] When the temperature control head detects that the temperature of the rubber in the plasticizing barrel exceeds the preset temperature, the PLC control motor is started, the motor output shaft rotates in the opposite direction, the planetary reducer adjusts the output speed of the motor output shaft, and drives the driving gear to rotate in the opposite direction through the driving shaft. The driving gear drives the driven gear to rotate in the opposite direction, and the hollow pin fixedly connected to several of the driven gears is screwed out of the plasticizing barrel. Preferably, when the temperature control head is partially pulled out from the spiral position of the plasticizing screw, it is equivalent to reducing the density of the spiral. When the density of the spiral is reduced, the contact area between the screw and the rubber is reduced. At the same time, the flow path of the rubber inside the screw becomes longer, the flow rate is reduced, the flow resistance is reduced, the internal pressure is reduced, and the shear force on the rubber is reduced.

[0022] Based on the above, the present invention also provides an injection molding machine with intelligent temperature control and precise positioning structure, the injection molding machine includes: a plasticizing injection system, a clamping system, a driving system, and a heating and cooling system.

[0023] In the utility model, the plasticizing injection system includes a plasticizing device and an injection device; the plasticizing device includes a plasticizing barrel and a sleeve-type variable-pitch plasticizing screw installed inside the plasticizing barrel; the injection device includes an injection barrel, an upper hot plate with multiple injection holes, and a lower hot plate;

[0024] The clamping system includes an electrically controlled sliding positioning device and a positioning shift plate;

[0025] The drive system includes a hydraulic device driven by hydraulic oil in the oil pipeline;

[0026] The heating and cooling system includes a cooling system, cooling pipelines, and an electric screw temperature control device.

[0027] In this utility model, the sleeved variable pitch plasticizing screw has a double-layer structure, including a plasticizing screw and a cooling screw. The plasticizing screw is hollow inside and sleeved on the outside of the cooling screw. The inner diameter of the plasticizing screw is larger than the outer diameter of the cooling screw. The plasticizing screw is divided into multiple zones along its length, including a support and sealing zone, a first plasticizing zone, a second plasticizing zone, a third plasticizing zone, and a melt guiding zone.

[0028] The supporting sealing area is one end of the driving structure close to the plasticizing screw, has a smooth surface, and is connected to the driving shaft or coupling to transmit the driving force;

[0029] The melt guide area is located at the other end of the plasticizing screw away from the drive structure, that is, the end of the plasticizing screw. It is conical. The melt guide area increases the pressure of the rubber melt through the conical structure to ensure that the melt is completely homogenized before entering the mold and increases the pressure entering the injection barrel.

[0030] The first plasticizing zone, the second plasticizing zone, and the third plasticizing zone are processed into spiral lines and corner rounding by turning, milling, grinding, and rolling forming processes. The linearity of the spiral lines includes involute, arc, parabola, hyperbola, and waveform shapes;

[0031] The first plasticizing zone is located at the front of the plasticizing screw. A spiral line is processed on the first plasticizing zone. The spiral line pitch range is 30-35mm, preferably 35mm; the thread angle is 30°, the upper side of the trapezoidal thread cross-section is 5.5mm, and the lower side is 18.9mm; the first plasticizing zone accounts for 25.51% of the entire plasticizing zone.

[0032] The second plasticizing zone is located in the middle of the plasticizing screw. A spiral line is processed on the second plasticizing zone. The spiral line pitch range is 50-55mm, preferably 55mm, the thread angle is 30°, the upper side of the trapezoidal thread section is 5.5mm, and the lower side is 18.9mm; the second plasticizing zone accounts for 61.22% of the entire plasticizing zone.

[0033] The third plasticizing zone is located at the rear of the plasticizing screw. A spiral line is processed on the third plasticizing zone. The spiral line pitch range is 30-35mm, preferably 35mm, the thread angle is 30°, the upper side of the thread cross-section trapezoid is 5.5mm, and the lower side is 18.9mm; the third plasticizing zone accounts for 13.27% of the entire plasticizing zone.

[0034] In the present invention, the cooling screw includes a spiral cooling zone, a coolant reflux channel, and a rotary joint. The spiral cooling zone corresponds to the plasticizing zone of the plasticizing screw and is provided with a first spiral cooling zone, a second spiral cooling zone, and a third spiral cooling zone. The rotary joint is exposed to the outside of the plasticizing screw; one end of the rotary joint is connected to the rotating original inlet, and the other end is connected to the fixed cooling water inlet and cooling water outlet; the front ends of the cooling screw and the plasticizing screw are fixed by a welding structure;

[0035] A first groove extending vertically through the side of the connection between the cooling zone and the coolant return channel is formed along the longitudinal direction. One end of the first groove is connected to the starting point of the spiral groove of the spiral cooling zone, connecting the spiral cooling channel and the coolant return channel. The first groove is in the shape of a truncated cone, and the diameters of the two ends are equal to the diameters of the channels at the corresponding positions. The ratio of the diameter of the coolant spiral channel to the radius of the coolant return channel is √2:1.

[0036] The spiral cooling zone is an area composed of continuous spiral grooves processed on the outside of the cooling screw. The spiral grooves in the spiral cooling zone and the inner wall of the plasticizing screw together form the flow channel of the coolant.

[0037] The first spiral cooling zone corresponds to the first plasticizing zone of the plasticizing screw. The spiral line of the first spiral cooling zone has a linearly varying pitch along the center line. The first pitch is 120 mm, and its proportion is equal to that of the first plasticizing zone.

[0038] The second spiral cooling zone corresponds to the second plasticizing zone of the plasticizing screw. The spiral line of the second spiral cooling zone has a linearly varying pitch along the center line. The second pitch is 200mm, and its proportion is equal to that of the second plasticizing zone.

[0039] The third spiral cooling zone corresponds to the third plasticizing zone of the plasticizing screw. The spiral line of the third spiral cooling zone has a linearly varying pitch along the center line. The third segment pitch is 80 mm, which is equivalent to the proportion of the third segment plasticizing zone.

[0040] In the utility model, the plasticizing barrel is used to contain rubber raw materials and generate heat through the action of rotation and shearing to increase the fluidity of the rubber raw materials. The rubber raw materials are plasticized through the rotation and shearing action of the sleeve-connected variable-pitch plasticizing screw.

[0041] The syringe melts the rubber and injects it into the mold; an injection screw is installed inside the syringe, and the rotation and advancement of the injection screw pushes the plasticized rubber into the mold through the injection port;

[0042] The multi-injection hole upper hot plate is a fixing and heating plate for the upper mold of the mold. One or more injection ports are provided on the multi-injection hole upper hot plate, through which the injection cylinder injects the plasticized rubber into the mold.

[0043] The lower hot plate is the fixed plate of the lower mold of the mold, and the other part of the mold is fixed on this plate.

[0044] In the utility model, the multi-injection hole upper heating plate is a multi-level structure, which includes an upper heat insulation plate, an upper plate temperature oil layer, a nozzle temperature oil layer, a lower plate temperature oil layer, a lower heat insulation plate, a heat plate, and a back plate from top to bottom; wherein,

[0045] The upper heat insulation plate is located above the upper plate warm oil layer and is in direct contact with the upper plate warm oil layer. It is used to isolate heat, prevent heat from being transferred to the upper layer, and protect the injection flow channel.

[0046] The upper plate temperature oil layer is located between the upper insulation plate and the nozzle temperature oil layer, and is in direct contact with the upper insulation plate and the nozzle temperature oil layer; the nozzle temperature oil layer is located between the upper plate temperature oil layer and the lower plate temperature oil layer, connecting the upper and lower temperature oil layers; the lower plate temperature oil layer is located between the nozzle temperature oil layer and the lower insulation plate, and is in direct contact with the nozzle temperature oil layer and the lower insulation plate; the upper plate temperature oil layer, the nozzle temperature oil layer, and the lower plate temperature oil layer are all used for cooling the flow channel;

[0047] The upper plate temperature oil layer, nozzle temperature oil layer and lower plate temperature oil layer are all connected to a set of cooling oil circulation system;

[0048] The lower heat insulation plate is located below the lower plate warm oil layer and is in direct contact with the lower plate warm oil layer. It is used to isolate heat and prevent the temperature of the hot plate from being transferred to the lower plate warm oil layer, nozzle warm oil layer and upper plate warm oil layer during vulcanization.

[0049] The hot plate is located between the lower insulation plate and the back plate. It generates heat through the internal heating elements and is used to heat the hot plate through electric heating or hot steam, providing heat for the product on the vulcanizer, so that the rubber product can complete the vulcanization process.

[0050] The back plate is located below the hot plate, in direct contact with the hot plate, supports the hot plate and is tightly connected to other structural components. It is used to support the hierarchical structure, maintain the stability and strength of the entire structure, and perform heat transfer.

[0051] Multiple injection nozzles are installed on the back plate. The upper end of the injection nozzle is connected to the upper insulation plate. The rubber enters the cavity of the injection nozzle through the injection channel. The cavity is directly connected to the upper plate temperature oil layer, nozzle temperature oil layer, and lower plate temperature oil layer to reduce the internal rubber temperature and avoid burning or old rubber blocking the injection nozzle. There is a gap between the lower half of the injection nozzle and the lower insulation plate and the hot plate to avoid direct contact with the hot plate, which may cause the internal rubber temperature to be too high.

[0052] The injection nozzle adopts a double-layer insulation design, with a hollow space between the outer and inner layers to reduce the direct contact area between the injection nozzle and the back plate, slowing down the temperature rise rate at the nozzle tail end, thereby reducing the rate of scorching and aging of the rubber at the corresponding position;

[0053] An injection cavity is provided corresponding to each injection nozzle, and the injection cavity passes through the nozzle temperature oil layer, the lower plate temperature oil layer, the lower heat insulation plate, the hot plate, the back plate, and is connected to the outside world through the injection nozzle;

[0054] An injection channel connecting the plasticizing barrel and the injection cavity is provided in the nozzle warm oil layer, and the plasticized rubber enters the injection cavity from the plasticizing barrel through the injection channel;

[0055] A cold runner is provided in the upper plate warm oil layer and the lower plate warm oil layer around the injection cavity. Cooling liquid flows through the cold runner to control the temperature of the plasticized rubber entering the injection cavity.

[0056] A solenoid valve is embedded in the back plate near the injection nozzle. The solenoid valve can be switched on and off in the back plate. The solenoid valve plug can block the injection nozzle to control the number and injection position of the injection nozzles for injection operation.

[0057] The injection nozzles on the backplate are divided into 3 groups, 4 in each group. Taking the center of the rectangle as the coordinate origin, the coordinates of the four injection nozzles in the first group are (550,550), (-550,550), (-550,-550), (550,-550); the coordinates of the four injection nozzles in the second group are (550,0), (0,550), (-550,0), (0,-550); the coordinates of the four injection nozzles in the third group are (350,200), (-350,200), (-350,-200), (350,-200).

[0058] In the utility model, a double ejector system is also included in conjunction with the plasticizing injection system. The double ejector is used to eject the molded product to ensure that the product can be demoulded smoothly.

[0059] In the utility model, the electrically controlled sliding positioning device is used to precisely control the position of the moving parts to ensure the accuracy and repeatability during the injection process;

[0060] With positioning plate for fixing and moving the mold to ensure the stable position of the mold during the injection process;

[0061] The oil pipeline is used to transport hydraulic oil, control the action of each hydraulic component, and realize injection, mold clamping and mold opening;

[0062] The cooling system is used to cool the injection channel to prevent the temperature from being too high, which may cause the rubber mix in the injection channel to burn or even age, affecting product quality or clogging the injection channel; the rubber mix is ​​the rubber that is evenly mixed with raw rubber and various raw materials through an internal mixer.

[0063] The cooling line is used to cool the plasticizing screw, plasticizing barrel and / or the injection cavity in the multi-injection hole upper hot plate to prevent excessive temperature from affecting the fluidity of the rubber and the injection quality;

[0064] The electric screw temperature control device is used to control the temperature of the sleeve variable pitch plasticizing screw and the plasticizing barrel to ensure the uniformity and stability of the melting of the rubber raw materials.

[0065] The electric control sliding positioning device includes a PLC motor, a driving gear, multiple driven supporting gears, a double-sided rack, a positioning slide, an electronic ruler, a tail end baffle, and a hydraulic lifting device;

[0066] The PLC motor is fixedly connected to the driving gear to drive the driving gear to rotate;

[0067] A plurality of driven supporting gears are arranged in a pair up and down to form a plurality of pairs of driven gear sets, which are arranged on the gear bracket and can rotate on the gear bracket;

[0068] The centers of the multiple driven support gears located below and the center of the driving gear are located in a straight line, and the centers of the multiple driven support gears located above are located in a straight line, and the two straight lines are parallel to the movement direction of the double-sided rack;

[0069] The double-sided rack is arranged between the upper and lower driven support gears of the multiple pairs of driven gear sets, and is arranged above the driving gear;

[0070] The teeth on the double-sided rack match the teeth of the driving gear and / or the driven supporting gear, and are in contact and meshing engagement with the driven supporting gear and / or the driving gear; the double-sided rack can move back and forth along the length direction of the double-sided rack under the drive of the driving gear and / or the driven supporting gear;

[0071] A positioning slider is provided at the front end of the double-sided rack. The front end of the positioning slider is set in a semicircular arc, square, or triangular shape. A positioning head is provided on the upper part of the positioning slider. The shape and size of the positioning head can match the mold positioning groove set at the bottom edge of the mold.

[0072] The electronic ruler is fixed on the side of the double-sided rack to measure the moving distance of the double-sided rack and transmit the data to the PLC motor control system for positioning;

[0073] The tail end baffle is set on the outer end of the double-sided rack movement path away from the positioning slider to prevent the double-sided rack and / or positioning slider from exceeding the travel range to ensure safety;

[0074] The PLC motor, gear bracket and tail end baffle are all fixedly set on the upper plane of the hydraulic lifting bracket. The lower plane of the hydraulic lifting bracket is connected to the hydraulic lifting device. The height can be changed by setting the hydraulic lifting device, thereby driving the PLC motor, gear bracket and tail end baffle fixed above the hydraulic lifting bracket to move up and down.

[0075] In the utility model, the positioning plate is a flat plate with a length sufficient for mold positioning, which is used to position the injection mold; grooves are opened on the opposite sides of its upper surface from the edge to the inside to ensure that all molds can be positioned at the injection position, and the innermost end of the groove can be set to a semicircular arc, square or triangle shape to match the top shape of the positioning slider. The positioning slider can slide in the groove under the drive of the double-sided rack;

[0076] Preferably, the positioning plate is 1600mmx1800mm; the groove is 600mm long, 58.8mm wide and 25mm deep.

[0077] In the utility model, the electric screw temperature control device

[0078] Based on the above device, the present invention also proposes an injection molding method, comprising the following steps:

[0079] Step 1: Place the required processing compound into the hopper, connect the hopper to the plasticizing barrel, set and check the temperature of the plasticizing barrel and the speed of the sleeve variable pitch plasticizing screw;

[0080] Step 2: Start the sleeve variable pitch plasticizing screw to start rotating. The processing compound rubber is heated and plasticized under the rotation and shearing action of the sleeve variable pitch plasticizing screw. The plasticizing temperature is monitored and maintained within the set range to ensure uniform heating and plasticization of the raw materials.

[0081] Step 3: Ensure the mold is installed and positioned correctly, preset the injection parameters including injection pressure, injection speed, and holding time, heat the mold, and adjust the mold temperature to the set temperature;

[0082] Step 4: Start the injection screw, push the plasticized rubber from the plasticizing barrel into the injection barrel, advance the injection screw, and inject the plasticized rubber into the mold cavity through the injection port; maintain the injection pressure and holding time until the mold cavity is full of rubber;

[0083] Step 5: Stop injection and keep the mold closed; after injection is completed, continue to heat the vulcanized rubber product using the upper and lower hot plates to complete vulcanization; start the cooling system, which cools the mold and the sleeve variable-pitch plasticizing screw to reduce the temperature and solidify the rubber product; the rubber of the utility model does not need to be cooled and solidified, and vulcanization itself is a solidification process. The cooling system is used for the injection runner to prevent the plasticized rubber in the injection runner from prematurely vulcanizing and blocking the runner;

[0084] Step 6: After cooling, start the mold opening and closing system, open the mold, start the double ejector system, and eject the molded rubber product from the mold.

[0085] In the present invention, the positioning process of the mold includes the following steps:

[0086] The belt positioning shift plate is located between two or more of the electrically controlled sliding positioning devices;

[0087] Before placing the mold, the height of the positioning slider is consistent with the height of the groove on the positioning plate, and is located at the entrance of the groove, in the initial position, and the PLC motor is in standby state, ready to receive control signals;

[0088] After receiving the start signal, the PLC motor starts to operate, the driving gear starts to rotate, and each tooth engages with the teeth on the double-sided rack, driving the double-sided rack to start moving; the positioning slider moves synchronously with the movement of the double-sided rack, and the initial position of the positioning slider is recorded by the electronic ruler;

[0089] The mold is placed on a positioning plate with a mold groove that matches the shape and size of the positioning head on the positioning slider. The positioning slider moves continuously with the movement of the double-sided rack. During the process, the electronic ruler continuously measures the position of the positioning slider and feeds the data back to the PLC motor to ensure that the positioning slider moves accurately to the specified position. The driving gear and the driven gear group work together to ensure that the positioning slider moves smoothly.

[0090] When the positioning slider moves to the mold groove, the PLC motor stops rotating after receiving the position information fed back by the electronic ruler; the positioning slider stops precisely at the designated position, completing the positioning operation;

[0091] After positioning is completed, the PLC motor rotates in the opposite direction, driving the positioning slider to move in the opposite direction back to the initial position, and the hydraulic lifting device lifts the hydraulic lifting bracket to directly move the positioning slider and / or the double-sided rack upward out of the groove on the positioning plate;

[0092] The positioning plate and the mold thereon are automatically sent between the upper hot plate and the lower hot plate through a track structure. The upper and lower hot plates are pressed tightly, and the injection step is mainly completed by the injection cylinder. After the injection is completed, the mold and the positioning plate are sent back between two or more of the electrically controlled sliding positioning devices. The hydraulic lifting bracket moves downward under the action of the hydraulic lifting device, and the positioning slider is back to its initial position; the PLC motor stops rotating, and the system enters standby mode, waiting for the next start signal.

[0093] The utility model also provides the application of the above injection machine or the above injection molding method in the molding production process of plastic or rubber products.

[0094] The beneficial effects of the present invention include: using an electric motor to drive the plasticizing screw and a servo motor to drive the injection barrel, so that it has low energy consumption, low noise, simple maintenance, and has high-precision control and rapid response capabilities, which significantly improves molding accuracy and production efficiency. The hydraulically driven double ejector system provides a powerful and stable ejection force, which is suitable for complex and large products, with smooth operation and reduced product damage. The advanced control system realizes high-precision parameter adjustment and fully automated operation, real-time monitoring and feedback, and ensures the stability and consistency of the production process. Overall, the optimized injection molding machine has significantly improved in energy saving and environmental protection, operating accuracy, response speed, ejection force and degree of automation, overcoming the problems of high energy consumption, high noise, low control accuracy and high maintenance cost in the existing technology, and greatly improving the performance and production efficiency of the injection molding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0096] Figure 1a-Figure 1c It is a schematic diagram of the overall structure of the injection molding machine with intelligent temperature control and precise positioning structure of the present invention.

[0097] Figure 2 It is a structural diagram of the plasticizing and injection part of the utility model.

[0098] Figure 3 It is a schematic diagram of the three-dimensional structure of the hot plate on the injection molding machine of the present invention.

[0099] Figure 4a-4c It is a schematic diagram of the injection surface and cross-sectional structure of the hot plate on the injection machine of the utility model.

[0100] Figure 5a 、 Figure 5b This is a schematic diagram of the mold precision positioning drive structure and the plate shifting structure of the utility model.

[0101] Figure 6 It is a structural schematic diagram of the electric-controlled sliding positioning device of the utility model.

[0102] Figure 7a-7c It is a schematic diagram of the structure of the sleeve-type variable pitch screw of the utility model.

[0103] Figure 8It is a schematic diagram of the structure of an equidistant screw in the prior art.

[0104] Figure 9a-9d It is a structural schematic diagram of the electric-controlled screw temperature control device of the utility model.

[0105] Figure 1a-Figure 9d middle,

[0106] 11-plasticizing barrel; 111-plasticizing inlet; 12-sleeved variable pitch plasticizing screw; 121-plasticizing screw; 1211-support sealing area; 1212-first plasticizing area; 1213-second plasticizing area; 1214-third plasticizing area; 1215-melt guiding area; 1216-spiral; 12161-spiral groove; 122-cooling screw; 1221-spiral cooling area; 12211-first spiral cooling area; 12212-second spiral cooling area; 12213-third spiral cooling area; 1222-cooling liquid reflux channel; 12221-cooling The connection port between the zone and the coolant return channel; 1223 - rotary joint; 1224 - first groove; 1225 - cooling water inlet; 1226 - cooling water outlet; 13 - injection cylinder; 14 - upper hot plate with multiple injection holes; 141 - injection port; 1411 - injection channel; 142 - upper thermal insulation plate; 143 - upper plate warm oil layer; 144 - nozzle warm oil layer; 145 - lower plate warm oil layer; 146 - lower thermal insulation plate; 147 - hot plate; 148 - back plate; 1481 - injection nozzle; 1482 - solenoid valve; 1483 - solenoid valve plug; 149 - cold runner; 15 - lower hot plate;

[0107] 21-Electrically controlled sliding positioning device; 211-PLC motor; 212-driving gear; 213-driven supporting gear; 214-double-sided rack; 215-positioning slide; 2151-positioning head; 216-electronic ruler; 217-tail end baffle; 218-hydraulic lifting device; 22-positioning shift plate; 221-second groove;

[0108] 31-Hydraulic device driven by hydraulic oil;

[0109] 41-Cooling system; 43-Electrically controlled screw temperature control device; 431-Device housing; 4311-Locking ring; 432-PLC control motor; 433-Planetary reducer; 434-Drive shaft; 435-Drive gear; 436-Driven gear; 438-Solid pin; 439-Hollow pin; 4391-Hollow rotating sleeve; 4392-Driven temperature control shaft; 4393-Temperature control head; 440-Motor support plate; 45-Cooling water inlet; 46-Injection and cold runner connection port;

[0110] 5-Double ejector system;

[0111] 61-Oil pipeline;

[0112] 7-Ejector device. DETAILED DESCRIPTION

[0113] The present invention is further described in detail with reference to the following specific examples and accompanying drawings. The processes, conditions, experimental methods, etc. for implementing the present invention, except for those specifically mentioned below, are all common knowledge and common common sense in the art and are not particularly limited in the present invention.

[0114] The utility model provides an injection molding machine with intelligent temperature control and precise positioning, which includes: a plasticizing injection system, a clamping system, a driving system, a heating and cooling system;

[0115] The plasticizing and injection system further comprises a plasticizing device and an injection device;

[0116] The plasticizing device includes a plasticizing barrel and a sleeve-type variable-pitch plasticizing screw installed inside the plasticizing barrel; the plasticizing barrel is used to contain rubber raw materials and generate heat through the action of rotation and shearing to increase their fluidity; the rubber raw materials are plasticized by the rotation and shearing action of the sleeve-type variable-pitch plasticizing screw;

[0117] The injection device includes an injection cylinder, an upper hot plate with multiple injection holes, and a lower hot plate; the injection cylinder is a component that melts the rubber and injects it into the mold; an injection screw is provided in the injection cylinder, and the plasticized rubber is pushed into the mold through the injection port through the rotation and advancement of the injection screw; the upper hot plate with multiple injection holes is a fixing and heating plate for the upper mold of the mold, and one or more injection ports are provided on the upper hot plate with multiple injection holes, through which the injection cylinder injects the molten rubber into the mold; the lower hot plate is a fixing plate for the lower mold of the mold, and the other part of the mold is fixed on this plate;

[0118] The mold locking system includes an electrically controlled sliding positioning device and a positioning plate; the electrically controlled sliding positioning device is used to accurately control the position of the moving parts to ensure accuracy and repeatability during the injection process; the positioning plate is used to fix and move the mold to ensure the mold is in a stable position during the injection process;

[0119] The electrically controlled sliding positioning device is used to position and fix the mold on the positioning plate. The positioning plate sends the mold into the space between the multi-injection hole upper hot plate and the lower hot plate through a slide rail. The lower hot plate can be controlled to rise and fall by a hydraulic cylinder. In actual use, the mold is firmly fixed between the multi-injection hole upper hot plate and the lower hot plate by controlling the lifting height of the hydraulic cylinder, which facilitates the injection operation.

[0120] The drive system includes a hydraulic device driven by hydraulic oil in an oil pipeline; the oil pipeline is used to transport hydraulic oil to control the actions of various hydraulic components to achieve actions such as injection, mold locking, and mold opening; the hydraulic device includes a hydraulic lifting device that drives the hydraulic lifting bracket in the electric-controlled sliding positioning device through the hydraulic oil in the oil pipeline, a hydraulic cylinder that drives the lower hot plate to rise and fall, a hydraulic ejector that drives the double ejector system to eject the molded product, a hydraulic injector that drives the injection cylinder to perform injection operations, and / or a hydraulic motor that drives the sleeve-type variable-pitch plasticizing screw to rotate.

[0121] The heating and cooling system includes a cooling system, a cooling pipeline, and an electrically controlled screw temperature control device; the cooling system is mainly used to cool the heat generated during the injection process to prevent the machine from overheating and affecting production efficiency and product quality; the cooling pipeline is used to cool the plasticizing screw, the plasticizing barrel, and / or the injection cavity in the multi-injection hole upper hot plate to prevent excessive temperature from affecting the fluidity and injection quality of the rubber; the electrically controlled screw temperature control device is used to control the temperature of the plasticizing screw and the plasticizing barrel to ensure the uniformity and stability of the melting of the rubber raw material;

[0122] The coolant in the cooling system cools the plasticizing screw and / or the injection cavity in the multi-injection hole upper hot plate through a cooling pipeline. The electric screw temperature control device adjusts the shear force and temperature of the rubber in the plasticizing barrel by changing the insertion depth of the hollow pin therein.

[0123] In addition, the injection molding machine also includes a double ejector system, which is used to eject the molded product to ensure smooth demoulding of the product. The ejector device is used to eject the product.

[0124] The injection molding method of this embodiment includes:

[0125] Step 1: Place the required processing compound into a hopper, connect the hopper to the plasticizing barrel, set and check the temperature of the plasticizing barrel and the speed of the sleeve variable pitch plasticizing screw;

[0126] Step 2: Start the sleeve variable pitch plasticizing screw to start rotating. The processing rubber mix is ​​plasticized into a molten state under the rotation and shearing action of the sleeve variable pitch plasticizing screw. Monitor and maintain the plasticizing temperature within the set range to ensure uniform melting of the raw materials.

[0127] Step 3: Ensure the mold is installed and positioned correctly, preset the injection parameters including injection pressure, injection speed, and holding time, heat the mold, and adjust the mold temperature to the set temperature;

[0128] Step 4: Start the injection screw to push the molten rubber from the plasticizing barrel into the injection barrel, advance the injection screw, and inject the molten rubber into the mold cavity through the injection port; maintain the injection pressure and holding time until the mold cavity is full of rubber;

[0129] Step 5: Stop injection, keep the mold closed, and start the cooling system to cool the mold and the sleeve variable pitch plasticizing screw to reduce the temperature and solidify the rubber product;

[0130] Step 6: After cooling, start the mold opening and closing system, open the mold, start the double ejector system, and eject the molded rubber product from the mold.

[0131] In step 1, the temperature of the plasticizing barrel is 70-80° C.; the rotation speed of the sleeve variable-pitch plasticizing screw is 0-90 rpm.

[0132] In step 2, the plasticizing time is 1 minute for 0-10 kg of mixed rubber.

[0133] In step 3, the injection pressure is 200 Bar (20 MPa); the injection speed is 0-280 cc / s (same cm 3 / s or mL / s); the holding time is 15s-60s; the mold temperature is between 130-150° C. Preferably, the holding time is 15s.

[0134] In step 4, the rotation speed of the injection screw is 0-90 rpm.

[0135] In step 5, the cooling temperature is 45-75 degrees Celsius, and the cooling time is at least 40 minutes. Preferably, the cooling temperature is 75 degrees Celsius.

[0136] For heating and vulcanization molding, the heating temperature is the same as the mold vulcanization temperature, and the time is adjusted according to the product thickness and the type of rubber used.

[0137] Specifically, the sleeve variable pitch plasticizing screw:

[0138] The sleeved variable pitch plasticizing screw is a double-layer structure, including a plasticizing screw and a cooling screw. The interior of the plasticizing screw is a hollow structure. The plasticizing screw is sleeved on the outside of the cooling screw. The inner diameter of the plasticizing screw is slightly larger than the outer diameter of the cooling screw.

[0139] The plasticizing screw can be divided into multiple areas along the length direction, including a support and sealing area, a first plasticizing area, a second plasticizing area, a third plasticizing area, and a melt guiding area in sequence;

[0140] The support sealing area is one end of the drive structure close to the plasticizing screw, has a smooth surface, is connected to the drive shaft or coupling, transmits the driving force, ensures that the plasticizing screw can smoothly receive the driving force, and transmits the power to the subsequent plasticizing area, so that it rotates in the plasticizing cylinder. The smooth surface of the support sealing area also facilitates precise connection with the driving component, ensuring the stability and efficiency of power transmission. In addition, the support sealing area can also cooperate with bearings, sealing rings or other supporting components to ensure that the plasticizing screw remains stable during rotation and prevent molten plastic from leaking to the outside of the plasticizing screw. The close cooperation between the smooth surface and the sealing component can effectively reduce friction, reduce wear, and extend the service life of the equipment.

[0141] The melt guiding area is located at the other end of the plasticizing screw away from the driving structure, that is, the end of the plasticizing screw, and is tapered, close to the plasticizing head and the injection mold. The melt guiding area increases the pressure of the plastic melt through the tapered structure, ensuring that the melt is completely homogenized before entering the mold. At the same time, by further compressing the rubber melt, the melt guiding area can effectively eliminate bubbles and unevenness in the melt, thereby improving the quality of injection molding. In addition, the melt guiding area is directly connected to the plasticizing head, controls the flow direction of the melt, and guides the homogenized melt into the runner of the mold, ensuring a smooth injection process. The tapered structure of the melt guiding area can reduce flow resistance, ensuring that the melt enters the mold at a uniform speed and pressure, thereby avoiding product defects caused by unstable flow.

[0142] The first plasticizing zone, the second plasticizing zone, and the third plasticizing zone are processed into spiral lines by turning, milling, grinding, rolling forming, etc., and the linearity of the spiral lines includes involute, arc, parabola, hyperbola, waveform, etc.;

[0143] The first plasticizing zone is located at the front of the plasticizing screw. A spiral line is processed on the first plasticizing zone, and the spiral line pitch is 35 mm; the thread angle is 30°, the upper side of the trapezoidal thread cross-section is 5.5 mm, and the lower side is 18.9 mm; the first plasticizing zone accounts for 25.51% of the entire plasticizing zone.

[0144] The second plasticizing zone is located in the middle of the plasticizing screw. A spiral line is processed on the second plasticizing zone. The spiral line pitch is 55mm, the thread angle is 30°, the upper side of the trapezoidal thread cross-section is 5.5mm, and the lower side is 18.9mm; the second plasticizing zone accounts for 61.22% of the entire plasticizing zone.

[0145] The third plasticizing zone is located at the rear of the plasticizing screw. A spiral line is processed on the third plasticizing zone. The spiral line pitch is 35 mm, the thread angle is 30°, the upper side of the trapezoidal thread cross-section is 5.5 mm, and the lower side is 18.9 mm. The third plasticizing zone accounts for 13.27% of the entire plasticizing zone.

[0146] The size of the pitch affects the movement speed of the rubber in the barrel and the mixing intensity, which in turn affects the mixing degree of the rubber; the thread angle mainly affects the amount of rubber fed per unit cross-section. The smaller the thread angle, the greater the amount of rubber fed, but the screw is more susceptible to wear and has a shorter life.

[0147] Using a smaller pitch near the end of the spiral line can reduce the movement speed of the rubber, thereby increasing the pressure on the end rubber to move forward, making it easier for the rubber to enter the injection barrel and avoiding phenomena such as backflow of the tail end melt.

[0148] The cooling screw includes a spiral cooling zone, a coolant reflux channel, and a rotary joint. The spiral cooling zone corresponds to the plasticizing zone of the plasticizing screw and is provided with a first spiral cooling zone, a second spiral cooling zone, and a third spiral cooling zone. The rotary joint is exposed outside the internal space of the plasticizing screw; the cooling screw and the front end of the plasticizing screw are fixed by a welding structure; the screw rotates, and the original inlet of the outer ring cooling water will follow the rotation, so a rotary joint is used to connect the rotating original inlet at one end and the fixed external inlet of the cooling water at the other end.

[0149] A first groove is provided on the side of the connection port between the cooling zone and the coolant return channel along the length direction, and one end of the first groove is connected to the starting point of the spiral groove of the spiral cooling zone, so as to connect the spiral cooling channel and the coolant return channel. The shape of the first groove is a truncated cone, and the diameters at both ends are equal to the diameters of the channels at the corresponding positions.

[0150] The ratio of the coolant spiral flow channel diameter to the coolant return channel radius is √2:1. When the cross-sectional area of ​​the semicircle and the full circle are the same, the ratio of the radius of the semicircle to the full circle is square root 2:1; the cross-section of the spiral cooling flow channel is a semicircle, and the cross-section of the coolant outlet flow channel is a full circle.

[0151] The spiral cooling zone is an area composed of continuous spiral grooves processed on the outer side of the cooling screw; the spiral grooves in the spiral cooling zone and the inner wall of the plasticizing screw together constitute a flow channel for the coolant;

[0152] The spiral cooling zone is an area composed of continuous spiral grooves processed on the outer side of the cooling screw; the spiral grooves in the spiral cooling zone and the inner wall of the plasticizing screw together constitute a flow channel for the coolant;

[0153] The first spiral cooling zone corresponds to the first plasticizing zone of the plasticizing screw. The spiral line of the first spiral cooling zone has a linearly varying pitch along the center line. The first pitch is 120 mm, and the proportion is equal to that of the first plasticizing zone.

[0154] The second spiral cooling zone corresponds to the second plasticizing zone of the plasticizing screw. The spiral line of the second spiral cooling zone has a linearly varying pitch along the center line. The second segment pitch is 200 mm, which is equal to the proportion of the second segment plasticizing zone.

[0155] The third spiral cooling zone corresponds to the third plasticizing zone of the plasticizing screw. The spiral line of the third spiral cooling zone has a linearly varying pitch along the center line. The third segment pitch is 80 mm, which is equal to the proportion of the third segment plasticizing zone.

[0156] The spiral portion at the end of the third spiral cooling zone is connected to a vertical through-hole provided along the length direction of the cooling screw;

[0157] In actual use, the coolant passes through the spiral flow channel of the spiral cooling zone, reaches the end of the cooling screw, enters the upper and lower through-channels arranged along the length direction of the cooling screw, flows along the channel, and finally flows out from the port close to the coolant return channel.

[0158] Specifically, the multi-injection hole hot plate:

[0159] The multi-injection hole upper heating plate is a multi-level structure, which mainly includes upper insulation plate, upper plate warm oil layer, nozzle warm oil layer, lower plate warm oil layer, lower insulation plate, heating plate and back plate from top to bottom;

[0160] The upper insulation board is located above the upper plate warm oil layer and is in direct contact with the upper plate warm oil layer. Its main function is to isolate heat, prevent heat from being transferred to the upper layer, and protect the structure above the upper insulation board;

[0161] The upper plate temperature oil layer is located between the upper heat insulation plate and the nozzle temperature oil layer, and is in direct contact with the upper heat insulation plate and the nozzle temperature oil layer. Its main function is to evenly conduct heat and make the surface temperature of the hot plate uniform;

[0162] The nozzle warm oil layer is located between the upper plate warm oil layer and the lower plate warm oil layer, connecting the upper and lower warm oil layers.

[0163] The lower plate temperature oil layer is located between the nozzle temperature oil layer and the lower heat insulation plate, and is in direct contact with the nozzle temperature oil layer and the lower heat insulation plate. Its main function is to evenly conduct heat and ensure uniform surface temperature of the hot plate.

[0164] The lower heat insulation plate is located below the lower plate warm oil layer and is in direct contact with the lower plate warm oil layer. Its main function is to isolate heat, prevent heat from conducting downward, and protect the structure below the lower heat insulation plate; the upper plate warm oil layer, nozzle warm oil layer, and lower plate warm oil layer are all used to cool the flow channel (the mixed rubber temperature in the flow channel is too high and will burn, or even directly cross-link and vulcanize to block the flow channel), and each warm oil layer is connected to a cooling oil circulation system.

[0165] The hot plate is located between the lower insulation plate and the back plate, and generates heat through the internal heating element, which is used to heat the hot plate through electric heating or hot steam, providing heat for the product on the vulcanizer, so that the rubber product can complete the vulcanization process.

[0166] The back plate is located below the hot plate, in direct contact with the hot plate, supports the hot plate and is tightly connected to other structural components. The back plate mainly plays a supporting role to maintain the stability and strength of the entire structure.

[0167] The back plate is provided with a plurality of injection nozzles, the upper end of the injection nozzle is connected to the upper insulation plate, and the rubber enters the cavity of the nozzle through the injection flow channel. The cavity is directly connected to the upper and lower temperature oil layers and the nozzle temperature oil layer to reduce the internal rubber temperature to avoid scorching or old rubber blocking the nozzle; there is a gap between the lower half of the nozzle and the lower insulation plate and the hot plate to avoid direct contact with the hot plate and causing the internal rubber temperature to be too high; the back plate nozzle is a double-layer insulation design, with a hollow space between the outer layer and the inner layer to reduce the direct contact area between the nozzle and the back plate, reduce the temperature rise rate of the nozzle tail end, and reduce the speed of scorching and aging of the rubber at the corresponding position (this position must be in contact with the back plate to avoid loosening and deformation of the nozzle, and the internal rubber needs to be emptied through the punching head before each injection);

[0168] The injection nozzles on the backplane are divided into 3 groups, 4 in each group. Taking the center of the rectangle as the coordinate origin, the coordinates of the four injection nozzles in the first group are (550, 550), (-550, 550), (-550, -550), (550, -550); the coordinates of the four injection nozzles in the second group are (550, 0), (0, 550), (-550, 0), (0, -550); the coordinates of the four injection nozzles in the third group are (350, 200), (-350, 200), (-350, -200), (350, -200). In order to ensure that the glue discharge pressure of the four holes is similar, the injection nozzles of the same group are generally used for injection at the same time. Special products such as asymmetric special-shaped parts can consider using four asymmetric holes or less than four injection holes for injection, but the injection speed needs to be adjusted to avoid abnormal product quality.

[0169] The injection hole position is based on the current hot plate size. If other hot plates are used or there are special product requirements, the injection nozzle position and quantity will be adjusted accordingly based on actual needs.

[0170] An injection cavity is provided corresponding to each injection nozzle, and the injection cavity passes through the nozzle temperature oil layer, the lower plate temperature oil layer, the lower heat insulation plate, the hot plate, and the back plate, and is communicated with the outside through the injection nozzle;

[0171] An injection channel connecting the plasticizing barrel and the injection cavity is provided in the nozzle warm oil layer, and the plasticized rubber enters the injection cavity from the plasticizing barrel through the injection channel;

[0172] A cold runner is provided in the upper plate warm oil layer and the lower plate warm oil layer around the injection cavity, and a coolant flows through the cold runner to control the temperature of the plasticized rubber entering the injection cavity;

[0173] A solenoid valve is embedded in the back plate near the injection nozzle, and the solenoid valve can be switched on and off in the back plate, wherein the solenoid valve plug can block the injection nozzle to control the number of injection nozzles performing the injection operation;

[0174] In a specific embodiment, when only a few injection nozzles need to be used during the injection operation, the solenoid valve is started and the other injection nozzles that are not needed are closed. The rubber plasticized by the plasticizing barrel enters the injection cavity through the injection flow channel and is then injected into the mold through the injection nozzle.

[0175] Specifically, the electric screw temperature control device:

[0176] The electric screw temperature control device includes a device housing, a PLC control motor, a planetary reducer, a drive shaft, a drive gear, a driven gear, a positioning ring, a solid pin, a hollow pin and other components.

[0177] The electric screw temperature control device includes one or more devices, which are generally annular and sleeved on the outside of the plasticizing barrel;

[0178] The device housing is fixed to the plasticizing barrel housing by bolts and / or brackets, wrapping the internal components to protect the internal components and prevent the external environment from affecting the device;

[0179] The PLC control motor is installed above the device housing; a motor support plate is also fixedly provided on the PLC control motor, and the motor support plate is fixed to the device housing by bolts to provide a stable support platform for the PLC control motor; the motor support plate can support and fix the PLC control motor, absorb vibration, and ensure that the motor remains stable during operation;

[0180] The output end of the PLC-controlled motor is connected to the planetary reducer, the input shaft of the planetary reducer is connected to the output shaft of the PLC-controlled motor through a coupling, and the body of the planetary reducer is fixed to the motor support plate or other fixed bracket by bolts;

[0181] The output end of the planetary reducer is connected to the drive shaft, and the drive shaft passes through the device housing and a positioning ring provided inside the device housing from the outside of the device housing, extends into the device housing, and the end portion is connected to the drive gear;

[0182] The output speed of the PLC-controlled motor is adjusted by the planetary reducer and then drives the drive gear to rotate via the drive shaft;

[0183] A plurality of driven gears are provided on both sides of the driving gear, and the driving gear and the driven gear or the driven gears are meshed in sequence; the driving gear or the driven gear is a helical bevel gear;

[0184] The helical bevel gear has a tapered rim and a tooth line inclined relative to the gear axis, allowing it to mesh with another similarly shaped gear. The inclination of the tooth line relative to the gear axis increases the contact area of ​​the gear meshing, thereby improving transmission smoothness and load capacity. During the transmission process, it has efficient power transmission capabilities and can withstand large torques, enabling power diversion and transmission between the drive gear and the driven gear, or between the driven gears. Multiple bevel gears mesh to form a quasi-circular structure, with the bevel gears intersecting at an angle of less than 90°. For example, bevel gears with an intersecting angle of 45° or 30° can be used.

[0185] In a specific embodiment, the extension line of the gear rim of each driving gear or the driven gear intersects at the center of the electric screw temperature control device, and the corresponding rectangular center angle is approximately 30°; 5 driven gears connected in sequence are respectively provided on both sides of the driving gear, and the driving gear and the driven gear approximately form an unclosed circle.

[0186] The positioning ring is arranged inside the device housing and is concentric with the device housing; hollow pins and solid pins are sequentially arranged on the multiple driven gears on both sides of the driving gear, and the hollow pins and the solid pins are arranged at intervals; the angle between the driving shaft and two adjacent hollow pins is approximately 30°, and the angle between two adjacent hollow pins and the solid pins is approximately 30°;

[0187] One end of the solid pin is rotatably connected to the positioning ring, and the other end is fixedly connected to the driven gear as a driving shaft of the driven gear; the hollow pin includes a hollow rotating sleeve, a driven temperature control shaft, and a temperature control head. One end of the hollow rotating sleeve of the hollow pin is rotatably connected to the positioning ring, and the other end passes through the axis of the driven gear and is inserted into the plasticizing barrel. A thread is provided between the driven temperature control shaft and the temperature control head, which can be screwed in and out on the wall of the plasticizing barrel to change the insertion depth of the temperature control head in the plasticizing barrel; a temperature sensor is provided on the temperature control head, which can monitor the rubber temperature in the plasticizing barrel in real time.

[0188] During the specific implementation process, when the temperature control head detects that the temperature of the rubber in the plasticizing barrel does not reach the preset temperature, the PLC control motor is started, the motor output shaft rotates, the planetary reducer adjusts the speed output by the motor output shaft, and drives the driving gear to rotate through the driving shaft, and the driving gear drives the driven gear to rotate, and the hollow pin fixedly connected to several of the driven gears is screwed into the interior of the plasticizing barrel. Specifically, when the temperature control head is partially inserted into the spiral line position of the plasticizing screw, it is equivalent to encrypting the spiral line. When the spiral line is encrypted, the contact area between the screw and the rubber increases, and at the same time, the flow path of the rubber inside the screw becomes shorter, the flow rate increases, the flow resistance increases, the internal pressure rises, and the shear force on the rubber also increases;

[0189] When the temperature control head detects that the temperature of the rubber in the plasticizing barrel exceeds the preset temperature, the PLC control motor is started, the motor output shaft rotates in the opposite direction, the planetary reducer adjusts the speed of the motor output shaft output, and drives the driving gear to rotate in the opposite direction through the driving shaft. The driving gear drives the driven gear to rotate in the opposite direction, and the hollow pin fixedly connected to several of the driven gears is screwed out of the plasticizing barrel. Specifically, when the temperature control head is partially pulled out from the spiral position of the plasticizing screw, it is equivalent to reducing the density of the spiral. When the spiral density is reduced, the contact area between the screw and the rubber is reduced. At the same time, the flow path of the rubber inside the screw becomes longer, the flow rate is reduced, the flow resistance is reduced, the internal pressure is reduced, and the shear force on the rubber is reduced.

[0190] Specifically, the mold precision positioning device (including the electric control sliding positioning device and the positioning shift plate):

[0191] The electric control sliding positioning device includes a PLC motor, a driving gear, multiple driven supporting gears, a double-sided rack, a positioning slide, an electronic ruler, a tail end baffle, and a hydraulic lifting device;

[0192] The PLC motor is fixedly connected to the driving gear and can drive the driving gear to rotate;

[0193] The plurality of driven supporting gears are arranged in a pair up and down to form a plurality of pairs of driven gear sets, which are arranged on the gear bracket and can rotate on the gear bracket;

[0194] The centers of the plurality of driven support gears located below and the center of the driving gear are located in a straight line, and the centers of the plurality of driven support gears located above are located in a straight line, and the two straight lines are parallel to the movement direction of the double-sided rack;

[0195] The double-sided rack is arranged between the upper and lower driven support gears of the plurality of pairs of driven gear sets, and is arranged above the driving gear;

[0196] The teeth on the double-sided rack match the teeth of the driving gear and / or the driven supporting gear, and are in contact and meshing engagement with the driven supporting gear and / or the driving gear; the double-sided rack can move back and forth along the length direction of the double-sided rack under the drive of the driving gear and / or the driven supporting gear.

[0197] A positioning slider is provided at the front end of the double-sided rack, and the front end of the positioning slider can be set to a semicircular arc shape, a square shape, a triangle shape, etc.; a positioning head is provided on the upper part of the positioning slider, and the shape and size of the positioning head can match the mold positioning groove provided on the bottom edge of the mold;

[0198] The electronic ruler is fixedly arranged on the side of the double-sided rack and is used to measure the moving distance of the double-sided rack;

[0199] The tail end baffle is arranged on the outer end of the double-sided rack movement path away from the positioning slider to prevent the double-sided rack and / or the positioning slider from exceeding the travel range, thereby ensuring safety;

[0200] The PLC motor, the gear bracket, and the tail end baffle are all fixedly arranged on the upper plane of the hydraulic lifting bracket, and the lower plane of the hydraulic lifting bracket is connected to the hydraulic lifting device. The height can be changed by the hydraulic lifting device, thereby driving the PLC motor, the gear bracket, and the tail end baffle fixed above the hydraulic lifting bracket to move up and down accordingly;

[0201] The electrically controlled sliding positioning device is used in conjunction with a positioning plate. The positioning plate is a flat plate with a length sufficient for mold positioning, and is used to position the injection mold. Grooves are opened on opposite sides of its upper surface from the edge to the inside to ensure that all molds can be positioned to the injection position. The innermost end of the groove can be set to a semicircular arc, square or triangle, matching the top shape of the positioning slider. The positioning slider can slide in the groove driven by the double-sided rack. The positioning plate is 1600mmx1800mm; the groove is 600mm long, 58.8mm wide and 25mm deep.

[0202] In actual use, the mold positioning process includes the following steps:

[0203] The belt positioning shift plate is located between two or more of the electrically controlled sliding positioning devices;

[0204] Before placing the mold, the height of the positioning slider is consistent with the height of the groove on the positioning plate, and is located at the entrance of the groove, in the initial position, and the PLC motor is in standby state, ready to receive control signals;

[0205] After receiving the start signal, the PLC motor starts to operate, the driving gear starts to rotate, and each tooth engages with the teeth on the double-sided rack, driving the double-sided rack to start moving; the positioning slider moves synchronously with the movement of the double-sided rack, and the initial position of the positioning slider is recorded by the electronic ruler;

[0206] The mold is placed on a positioning plate with a mold groove that matches the shape and size of the positioning head on the positioning slider. The positioning slider moves continuously with the movement of the double-sided rack. During the process, the electronic ruler continuously measures the position of the positioning slider and feeds the data back to the PLC motor to ensure that the positioning slider moves accurately to the specified position. The driving gear and the driven gear group work together to ensure that the positioning slider moves smoothly.

[0207] When the positioning slider moves to the mold groove, the PLC motor stops rotating after receiving the position information fed back by the electronic ruler; the positioning slider stops precisely at the designated position, completing the positioning operation;

[0208] After positioning is completed, the PLC motor rotates in the opposite direction, driving the positioning slider to move in the opposite direction back to the initial position, and the hydraulic lifting device lifts the hydraulic lifting bracket to directly move the positioning slider and / or the double-sided rack upward out of the groove on the positioning plate;

[0209] Furthermore, the positioning plate and the mold thereon are automatically sent between the upper hot plate and the lower hot plate through structures such as rails, and the upper and lower hot plates are pressed tightly, and the injection step is mainly completed by the injection cylinder. After the injection is completed, the mold and the positioning plate are sent back between two or more of the electrically controlled sliding positioning devices, and the hydraulic lifting bracket moves downward under the action of the hydraulic lifting device, and the positioning slider is back to its initial position; the PLC motor stops rotating, and the system enters standby mode, waiting for the next start signal.

[0210] The protection content of the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, any changes and advantages that can be thought of by those skilled in the art are included in the present invention and are protected by the appended claims.

Claims

1. An electric screw temperature control device, characterized in that: include: Device housing, PLC control motor, planetary reducer, drive shaft, drive gear and positioning ring; among them, The device housing is fixed on the sleeve-type variable-pitch plasticizing screw; the PLC-controlled motor is arranged above the device housing; the output end of the PLC-controlled motor is connected to the input shaft of the planetary reducer through a coupling, and the body of the planetary reducer is fixed to a fixed bracket; the output end of the planetary reducer is connected to the drive shaft, and the drive shaft passes through the device housing and a positioning ring provided inside the device housing from the outside of the device housing, extends into the device housing, and the end is connected to the drive gear; There are one or more electric-controlled screw temperature control devices, which are sleeved on the outside of the plasticizing barrel.

2. The electric screw temperature control device according to claim 1, characterized in that: The electrically controlled screw temperature control device further includes: a driven gear; the output speed of the PLC-controlled motor is adjusted by the planetary reducer, and then the driving gear is driven to rotate via the driving shaft; a plurality of driven gears are arranged on both sides of the driving gear, and the driving gear and the driven gear or the driven gears are meshed in sequence.

3. The electric screw temperature control device according to claim 2, characterized in that: The positioning ring is arranged inside the device housing and forms a concentric circle with the device housing; hollow pins and solid pins are sequentially arranged on the multiple driven gears on both sides of the driving gear.

4. The electric screw temperature control device according to claim 3, characterized in that: One end of the solid pin is rotatably connected to the positioning ring, and the other end is fixedly connected to the driven gear as the driving shaft of the driven gear; the hollow pin includes a hollow rotating sleeve, a driven temperature control shaft, and a temperature control head. One end of the hollow rotating sleeve of the hollow pin is rotatably connected to the positioning ring, and the other end passes through the axis of the driven gear and is inserted into the plasticizing barrel.

5. The electric screw temperature control device according to claim 4, characterized in that: A thread is provided between the driven temperature control shaft and the temperature control head, which can be screwed in and out on the wall of the plasticizing barrel to change the insertion depth of the temperature control head in the plasticizing barrel; a temperature sensor is provided on the temperature control head to monitor the temperature of the rubber in the plasticizing barrel in real time.

6. The electrically controlled screw temperature control device according to claim 4, characterized in that: The hollow pins and the solid pins are arranged at intervals; the angle between the drive shaft and two adjacent hollow pins is 30°, and the angle between two adjacent hollow pins and the solid pin is 30°.

7. The electrically controlled screw temperature control device according to claim 1, characterized in that: The PLC controlled motor is also provided with a motor support plate, which is fixed to the device housing by bolts, providing a stable support platform for the PLC controlled motor; the motor support plate can support and fix the PLC controlled motor, absorb vibration, and ensure that the motor remains stable during operation; and / or, The electrically controlled screw temperature control device is generally in the shape of a circular ring.

8. The electric screw temperature control device according to claim 2, characterized in that: The driving gear or the driven gear is a helical bevel gear.

9. The electric screw temperature control device according to claim 8, characterized in that: The gear rim of the helical bevel gear is conical, and the tooth line is inclined relative to the gear axis, so that it can mesh with another gear of similar shape; since the tooth line is inclined relative to the gear axis, the contact area of ​​the gear meshing is increased, thereby improving transmission stability and load capacity.

10. The electric screw temperature control device according to claim 2, characterized in that: The extension line of the gear rim of each driving gear or the driven gear intersects at the center of the electric screw temperature control device, and the corresponding rectangular center angle is 30°; 5 driven gears connected in sequence are respectively arranged on both sides of the driving gear, and the driving gear and the driven gear approximately form an unclosed circle.

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