A clamping mechanism for a high-speed injection molding machine

Abstract

The present invention relates to a mold clamping mechanism of a high-speed injection molding machine, belonging to the technical field of injection molding. It includes a front plate, a second plate, a rear plate, tie rods, a driving mechanism, a temperature detection mechanism, a heat dissipation mechanism, a toggle mechanism, a mold adjustment mechanism and a control terminal. The tie rods sequentially pass through the rear plate, the second plate and are connected to the front plate. The mold adjustment mechanism is installed at the rear end of the rear plate and drives the rear plate to slide on the tie rods. The driving mechanism is installed at the rear end of the rear plate and the driving end is connected to the second plate through the toggle mechanism. The driving mechanism drives the second plate to slide on the tie rods through the toggle mechanism and cooperates with the front plate to complete mold clamping. The temperature detection mechanism is used to detect the temperature change of the driving mechanism during operation and is communicatively connected to the control terminal. The heat dissipation mechanism is installed at the driving end of the driving mechanism and dissipates heat from the driving end. The present invention solves the problem that the screw nut of the existing mold clamping mechanism of the injection molding machine is locked with the screw due to the increase in temperature caused by the rapid reciprocating movement during injection molding.

Description

Technical Field

[0001] The present invention belongs to the technical field of injection molding, and particularly relates to a mold clamping mechanism of a high-speed injection molding machine. Background Art

[0002] At present, in the plastic processing, metal die-casting and rubber processing industries, most of the mold clamping devices used in injection molding equipment and die-casting molding equipment adopt a two-plate type (abbreviated as two-plate machine). The two-plate mold clamping device has a simple and compact structure and is easy to use. The two-plate mold clamping device generally includes a moving template, a fixed template, tie rods connected between the moving template and the fixed template and for the moving template to move thereon, a mold clamping oil cylinder, a brake assembly, etc.

[0003] In order to ensure sufficient mold clamping force when injecting plastic melt into the mold clamping mechanism at high speed and high pressure, and to avoid the occurrence of mold expansion and overflow of materials under the reaction force of the high-speed and high-pressure melt, which affects product quality, damages the mold system, and damages the mold clamping mechanism, the existing two-plate mold clamping device needs to adjust the mold to ensure the accuracy of the mold clamping system. The common mold adjustment method is to keep the fixing nut of the head plate stationary and rotate the adjusting die nut group of the tail plate, so that the die nut drives the tail plate to move forward or backward relative to the tie rod, thereby adjusting the mold thickness. The adjusting die nut group usually consists of four adjusting die nuts, and generally one center large gear ring drives them at the same time, and the center large gear ring is driven by a hydraulic or electric motor.

[0004] During the injection process of a high-speed electric injection molding machine, the two plates need to move forward and backward quickly and reciprocally to complete the injection process. During this process, the electric motor needs to drive the lead screw nut to rotate frequently. A large amount of heat will be generated during the continuous rotation of the lead screw nut, resulting in too high a temperature rise of the lead screw nut and deformation, reducing the gap between the lead screw nut and the lead screw, thereby increasing the friction force between the lead screw nut and the lead screw. Furthermore, during continuous use, the lead screw nut may be locked with the lead screw, affecting the normal operation of injection molding, halting the production line, causing economic losses. Moreover, during the locking process of the lead screw nut, the friction force increases, and the mold may not be correctly closed, which may cause damage or deformation of the mold, further increasing the maintenance cost. Summary of the Invention

[0005] To solve the above problems existing in the prior art, the present invention provides a mold clamping mechanism of a high-speed injection molding machine, which solves the problem that the lead screw nut is locked with the lead screw due to the rapid reciprocating movement during the injection process of the existing injection molding machine mold clamping mechanism, resulting in a temperature rise.

[0006] The object of the present invention can be achieved by the following technical solutions: A clamping mechanism for a high-speed injection molding machine, comprising a front plate, a second plate, a tail plate, tie rods, a driving mechanism, a temperature detection mechanism, a heat dissipation mechanism, a toggle mechanism, a mold adjustment mechanism and a control terminal. The tie rods sequentially pass through the tail plate and the second plate and are connected to the front plate. The mold adjustment mechanism is installed at the tail end of the tail plate and drives the tail plate to slide on the tie rods. The driving mechanism is installed at the tail end of the tail plate, and the driving end is connected to the second plate through the toggle mechanism. The driving mechanism drives the second plate to slide on the tie rods through the toggle mechanism and cooperates with the front plate to complete mold clamping. The temperature detection mechanism is used to detect the temperature change of the driving mechanism during operation and is communicatively connected to the control terminal. The heat dissipation mechanism is installed at the driving end of the driving mechanism and dissipates heat from the driving end.

[0007] The driving mechanism includes a driving motor, a lead screw and a crosshead. The driving motor is installed at the tail end of the tail plate. The lead screw is connected to the output end of the driving motor. The crosshead is in threaded connection with the lead screw. The crosshead is slidably connected to one end of the tail plate close to the second plate. One end of the toggle mechanism is rotatably connected to the crosshead and the tail plate, and the other end is connected to the second plate. The heat dissipation mechanism includes a heat conduction cylinder and a plurality of heat dissipation fins. The heat conduction cylinder is embedded on the side of the crosshead close to the tail plate, and the plurality of heat dissipation fins are circumferentially arranged on the side wall of the heat conduction cylinder.

[0008] As a preferred technical solution of the present invention, a groove is formed on the side wall of the heat conduction cylinder close to the tail plate, and a plurality of through holes are formed on the side wall of the groove. A heat dissipation cavity is formed on the side of the heat conduction cylinder close to the crosshead, and a coolant is filled in the heat dissipation cavity.

[0009] As a preferred technical solution of the present invention, the heat dissipation mechanism further includes a diversion fan, and the diversion fan is rotatably connected to the end face of the heat conduction cylinder close to the tail plate.

[0010] As a preferred technical solution of the present invention, a tie rod deformation detector is provided at one end of the tie rod close to the front plate, and a temperature detector and a force sensor are provided on the side wall of the second plate close to the tail plate. The tie rod deformation detector, the temperature detector and the force sensor are all communicatively connected to the control terminal. The temperature detector is used to detect the temperature change of the tie rod during mold clamping of the second plate, and the force sensor is used to detect the resistance generated by the tie rod during mold clamping of the second plate. The control terminal adjusts the mold clamping force output by the mold adjustment mechanism according to the received transmission data.

[0011] As a preferred technical solution of the present invention, the mold adjustment mechanism includes a hydraulic motor, an intermediate gear and a mold adjustment lead screw nut set. The output end of the hydraulic motor is engaged with the intermediate gear. The intermediate gear is rotatably connected to the tail end of the tail plate. The intermediate gear is respectively engaged with the outer ring of the mold adjustment lead screw nut set. The inner ring of the mold adjustment lead screw nut set is connected to the tie rod. The hydraulic motor drives the intermediate gear to make the mold adjustment lead screw nut set drive the tail plate to adjust its position on the tie rod.

[0012] As a preferred technical solution of the present invention, the toggle mechanism includes a connecting plate and a plurality of toggle levers. One end of the connecting plate is rotatably connected to the second plate, and the other end is rotatably connected to the same ends of the plurality of toggle levers. The other ends of the toggle levers are rotatably connected to the tail plate. A connecting platform is provided at one end of the toggle lever close to the connecting plate, and the connecting platform is rotatably connected to the crosshead.

[0013] As a preferred technical solution of the present invention, the thickness of the side wall of the tail plate connected to the toggle mechanism is greater than the side wall not connected to the toggle lever.

[0014] As a preferred technical solution of the present invention, reinforcing ribs are provided on opposite side walls of the second plate, and the connection points of the reinforcing ribs with the connecting plate are correspondingly arranged.

[0015] As a preferred technical solution of the present invention, the second plate is slidably connected to the pull rod through a graphite copper sleeve, and the graphite copper sleeve is filled with lubricating oil.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The heat conduction cylinder in the heat dissipation mechanism is embedded on the lead screw nut on the crosshead, and the heat generated on the lead screw nut is transferred to the heat conduction cylinder, and then the heat dissipation effect of the lead screw nut is improved through a plurality of heat dissipation fins installed on the heat conduction cylinder, thereby reducing the heat accumulation on the lead screw nut, thus solving the problem that the lead screw nut of the existing injection molding machine clamping mechanism is locked with the lead screw due to the rapid reciprocating movement during the injection molding process, resulting in temperature rise.

[0018] 2. The temperature of the pull rod is detected by a temperature sensor and the resistance generated by the pull rod during the clamping process is detected by a force sensor. If both the temperature and the resistance increase, it means that the deformation amount of the pull rod increases, resulting in an increase in the frictional force when the second plate slides on the pull rod, thereby increasing the temperature of the pull rod. Therefore, after the second plate completes the clamping, the clamping force at this time will be less than the preset value. Moreover, as the fatigue degree of the pull rod increases, the deformation amount of the pull rod at this time is different from the deformation amount of the pull rod in the normal state during the clamping process. Therefore, when adjusting the clamping force through the die adjustment mechanism at this time, the control terminal allows the clamping mechanism to complete the adjustment more precisely by the numerical values of the temperature change and the resistance change of the pull rod, so that the clamping force can be the same as the preset value during the mold closing process, thereby effectively protecting the system and avoiding the situation of greater damage to the pull rod caused by overloading of the clamping force, improving the service life of the pull rod, and solving the problem that the uneven force on the four pull rods or insufficient clamping force of the existing injection molding machine clamping mechanism affects the quality of the final product during the clamping process. Description of the Drawings

[0019] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the tail plate of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the toggle mechanism of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the heat dissipation mechanism of the present invention;

[0024] Description of main component symbols

[0025] In the figure: 1, head plate; 2, second plate; 3, tail plate; 4, tie rod; 5, drive mechanism; 51, drive motor; 52, crosshead; 53, toggle mechanism; 531, connecting plate; 532, toggle; 533, connecting table; 54, lead screw; 6, die setting mechanism; 61, hydraulic motor; 62, intermediate gear; 63, die setting nut group; 7, heat dissipation mechanism; 71, heat sink; 72, heat conducting cylinder; 721, heat dissipation cavity; 722, groove; 723, through hole; 73, guide fan; 8, tie rod deformation detector. Specific embodiments

[0026] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will, with reference to the accompanying drawings and preferred embodiments, describe in detail the specific embodiments, structures, features and their effects of the present invention.

[0027] Please refer to Figures 1-4, this embodiment provides a clamping mechanism for a high-speed injection molding machine, which includes a front platen 1, a second platen 2, a rear platen 3, tie rods 4, a driving mechanism 5, a temperature detection mechanism, a heat dissipation mechanism 7, a toggle mechanism 53, a mold adjustment mechanism 6 and a control terminal. The tie rods 4 sequentially pass through the rear platen 3, the second platen 2 and are connected to the front platen 1. The mold adjustment mechanism 6 is installed at the end of the rear platen 3 and drives the rear platen 3 to slide on the tie rods 4. The driving mechanism 5 is installed at the end of the rear platen 3 and its driving end is connected to the second platen 2 through the toggle mechanism 53. The driving mechanism 5 drives the toggle mechanism 53 to rotate to drive the second platen 2 to slide on the tie rods 4 and cooperate with the front platen 1 to complete the clamping process. Since the present invention is an electric high-speed injection molding mechanism, during the injection molding process, the driving end of the driving mechanism 5 will frequently reciprocate to push the injection molding process of the second platen 2. And during this injection molding process, the speed is fast, which causes a large amount of heat to be generated during the continuous friction of the driving end. Due to the narrow position of the driving end, this part of the heat cannot be dissipated in time, resulting in heat accumulation on the driving end, causing the temperature of the driving end to rise. As the temperature continues to rise, it will cause the driving end to deform and the gap between the driving end and the driving shaft to decrease, thereby increasing the friction force between the driving end and the driving shaft, and further increasing the generated heat, resulting in the continuous reduction of the gap between the driving end and the driving shaft and finally reaching a locked state.

[0028] The heat dissipation mechanism 7 is installed at the driving end of the driving mechanism 5 to dissipate heat from the driving end. At the same time, the temperature detection mechanism detects the temperature change of the driving mechanism 5 during the operation of the injection molding process and transmits the detection result to the control terminal. When the temperature detection mechanism detects that the temperature of the driving end rises to the set threshold, the protection mechanism is started to stop the injection molding process, so that the temperature of the driving end can be controlled and heat dissipation can be carried out, thereby avoiding the occurrence of the locked state due to excessive resistance during the movement of the driving end.

[0029] In order to better dissipate heat from the driving end, the driving mechanism 5 includes a driving motor 51, a crosshead 52, a toggle mechanism 53, and a lead screw 54. The driving motor 51 is installed at the end of the tail plate 3. The lead screw 54 is connected to the output end of the driving motor 51. The crosshead 52 is helically connected to the lead screw 54. The crosshead 52 is slidably connected to one end of the tail plate 3 close to the second plate 2. One end of the toggle mechanism 53 is rotatably connected to the crosshead 52 and the tail plate 3, and the other end is connected to the second plate 2. When mold opening is performed, the control system gives an instruction to the driving motor 51, which drives the lead screw nut to push the crosshead 52 and drives the second plate 2 to move to achieve mold opening. During this period, the highly sensitive position sensor continuously feedbacks the position of the second plate 2. The control system adjusts the instruction to the driving motor 51, drives the lead screw nut to link with the crosshead 52, and controls the moving position and speed of the second plate 2, realizing a controllable and programmable moving speed and position. The position accuracy of high-speed mold opening reaches 0.01 mm, accurately controlling the second plate 2 to reach the set mold opening position. The opening and closing of the crosshead 52 drive adopts the output power of the driving motor 51, which drives the lead screw nut to push the crosshead 52 to realize the opening and closing of the mold locking mechanism. The torque and speed of the driving motor 51 can be programmed and controlled, with fast speed, fast response, accurate position, and high thrust repetition accuracy. The lead screw nut transmission has high efficiency and energy saving. During the injection molding process, the lead screw 54 needs to rotate frequently to make the crosshead 52 reciprocate to complete the injection molding process. During this process, the lead screw nut connected to the lead screw 54 on the crosshead 52 will generate a large amount of heat during continuous movement. Therefore, in order to prevent heat accumulation from causing the lead screw nut to reach the low-temperature tempering temperature (120°), and this process is irreversible, resulting in deformation and reducing the gap with the lead screw 54, thereby causing the friction force to continuously increase and finally resulting in a locking situation. The heat conduction cylinder 72 in the heat dissipation mechanism 7 is embedded on the lead screw nut on the crosshead 52, transferring the heat generated on the lead screw nut to the heat conduction cylinder 72, and then through a number of heat dissipation fins 71 installed on the heat conduction cylinder 72 to improve the heat dissipation effect of the lead screw nut, thereby reducing the heat accumulation on the lead screw nut, thus solving the problem that the lead screw nut of the existing injection molding machine mold locking mechanism locks with the lead screw 54 due to the rapid reciprocating movement during the injection molding process, resulting in temperature rise.

[0030] Since the lead screw nut is embedded in the crosshead 52, and the space gap between the crosshead 52 and the tail plate 3 is small, the air fluidity in the space between the crosshead 52 and the tail plate 3 is poor during the injection molding process, resulting in the heat on the lead screw nut not being dissipated in time, thus causing heat accumulation. Therefore, in order to improve the heat dissipation effect of the lead screw nut, in one embodiment, a groove 722 is formed on the side wall of the heat conducting cylinder 72 close to the tail plate 3, and a plurality of through holes 723 are formed on the side wall of the groove 722. A heat dissipation cavity 721 is formed on the side of the heat conducting cylinder 72 close to the crosshead 52, and a coolant is filled in the heat dissipation cavity 721. During the injection molding process, the heat generated by the lead screw nut will be transferred by the heat conducting cylinder 72 and dissipated through the heat sink 71. At the same time, the coolant filled in the heat conducting cylinder 72 will also transfer heat. Moreover, by forming the groove 722 and the through holes 723 at the position of the heat conducting cylinder 72 far from the heat source, when the heat conducting cylinder 72 and the heat sink 71 dissipate heat, the heat source is on the side close to the crosshead 52, and the side close to the tail plate 3 is a region with a lower temperature. Therefore, due to the heat transfer effect, the air flow will enter from the through holes 723 close to the heat source and flow out from the through holes 723 far from the heat source, thus forming a chimney effect, strengthening the air circulation of the heat sink 71, accelerating the heat dissipation efficiency, and improving the heat dissipation effect.

[0031] Although the air circulation in the heat conducting cylinder 72 is improved through the through holes 723 and the groove 722, the efficiency is low. Therefore, in order to improve the efficiency of air circulation and thus improve the heat dissipation efficiency, in one embodiment, the heat dissipation mechanism 7 further includes a guide fan 73. The guide fan 73 is rotatably connected to the end face of the heat conducting cylinder 72 close to the tail plate 3. During the movement of the crosshead 52, the guide fan 73 will be pushed by the driven air flow, thus generating forced convection, accelerating the transfer of heat from the heat conducting cylinder 72 to the air, overcoming the limitation of natural convection, enabling the air circulation inside the heat conducting cylinder 72 to continue, ensuring a continuous heat dissipation effect, and thus improving the heat dissipation efficiency of the heat dissipation mechanism 7.

[0032] When the temperature detection mechanism detects that the temperature of the driving end reaches the threshold value, in order to avoid the deviation of the frictional force between the pull rod 4 and the second platen 2 during the mold clamping process due to insufficient output force of the driving end, resulting in the mismatch between the mold clamping force of the mold adjustment mechanism 6 and the deformation amount of the pull rod 4, which may cause the mold clamping force to overload and damage the mold system and the mold clamping mechanism. Therefore, in one embodiment, a pull rod deformation detector 8 is provided at one end of the pull rod 4 close to the fixed platen 1, and a temperature detector and a force sensor are provided on one side wall of the second platen 2 close to the moving platen 3. The pull rod deformation detector 8, the temperature detector and the force sensor are all communicatively connected to the control terminal. The control terminal adjusts the mold clamping force output by the mold adjustment mechanism 6 according to the received transmission data. During the injection molding process, the driving mechanism 5 drives the second platen 2 to move towards the fixed platen 1 to complete the mold clamping and then the injection molding process. After the mold clamping is completed, it is necessary to ensure that the mold clamping force reaches the preset value and remains stable during the injection molding process. Therefore, after the second platen 2 and the fixed platen 1 complete the mold clamping, the pull rod deformation detector 8 detects the deformation amount of the pull rod 4 to obtain whether the current mold clamping force meets the standard. If the current mold clamping force does not reach the preset value, at this time, the mold adjustment mechanism 6 drives the moving platen 3 to move towards the fixed platen 1, so that the mold clamping force between the second platen 2 and the fixed platen 1 gradually increases to reach the preset value. At the same time, during the mold clamping process, the temperature detector detects the temperature of the pull rod 4, and the force sensor detects the resistance generated between the second platen 2 and the pull rod 4 during the mold clamping process. If the increase values of the temperature and the resistance of the pull rod 4 during the mold clamping process are larger than those in the previous mold clamping process, at this time, when the mold adjustment mechanism 6 adjusts the mold clamping force, the adjustment strength of the mold adjustment mechanism 6 will slow down, avoiding the situation that the impact on the pull rod 4 is too large due to excessive adjustment speed, which may accelerate the fatigue damage of the pull rod 4. Moreover, by detecting the temperature of the pull rod 4 through the temperature sensor and detecting the resistance generated by the pull rod 4 during the mold clamping process through the force sensor, if both the temperature rise and the resistance increase, it means that the deformation amount of the pull rod 4 has increased, resulting in an increase in the frictional force when the second platen 2 slides on the pull rod 4, thereby increasing the temperature of the pull rod 4. Therefore, after the second platen 2 completes the mold clamping, the current mold clamping force will be less than the preset value. And as the fatigue degree of the pull rod 4 increases, the deformation amount of the pull rod 4 at this time is different from the deformation amount generated by the pull rod 4 in the normal state during the mold clamping process. Therefore, when adjusting the mold clamping force through the mold adjustment mechanism 6 at this time, the control terminal makes the mold clamping mechanism complete the adjustment more accurately through the numerical values of the temperature change and the resistance change of the pull rod 4, so that the mold clamping force can be the same as the preset value during the mold closing process, thereby effectively protecting the system and avoiding the situation that the mold clamping force overload causes greater damage to the pull rod 4, and improving the service life of the pull rod 4.

[0033] In order to better detect the condition of the tie rod 4 and ensure the smooth progress of the injection molding process, in this embodiment, there are four tie rods 4, and a tie rod deformation detector 8 is independently provided on each of the four tie rods 4. The temperature detector and the force sensor are arranged one by one corresponding to the four tie rods 4. During the injection molding process, ideally, the tie rod 4 will not be affected by the additional frictional force caused by the second platen 2. However, there will be assembly errors during the assembly of the tie rod 4, and at the same time, due to the assembly error of the second platen 2 during the mold clamping process, it will also affect the tie rod 4. Therefore, different situations will occur for each tie rod 4 during the injection molding process. Therefore, the independent tie rod deformation detector 8, temperature detector, and force sensor are used to detect the condition of each tie rod 4, so as to better judge the state of each tie rod 4 during the injection molding and mold clamping processes, avoiding excessive tensile deviation of the tie rod 4 with the largest load due to continuous impact during mold clamping, and thus reducing the occurrence of abnormal use of the tie rod 4.

[0034] In order to more accurately control the magnitude of the mold clamping force, avoid the problem of flash caused by too small mold clamping force affecting the product quality, and at the same time avoid the situation where the impact force on the tie rod 4 is too large due to too large mold clamping force resulting in increased fatigue, in one embodiment, the mold adjustment mechanism 6 includes a hydraulic motor 61, an intermediate gear 62, and a mold adjustment lead screw nut set 63. The output end of the hydraulic motor 61 meshes with the intermediate gear 62. The intermediate gear 62 is rotatably connected to the end of the tail plate 3. The intermediate gear 62 meshes with the outer ring of the mold adjustment lead screw nut set 63 respectively. The inner ring of the mold adjustment lead screw nut set 63 is connected to the tie rod 4. The hydraulic motor 61 drives the intermediate gear 62 to drive the mold adjustment lead screw nut set 63 to drive the tail plate 3 to adjust its position on the tie rod 4. When adjusting the mold clamping force, the hydraulic motor 61 drives the intermediate gear 62 to rotate, thereby driving the mold adjustment lead screw nut set 63 to rotate to move the tail plate 3 towards the head plate 1 to adjust the mold clamping force. By using the hydraulic motor 61 to output a higher torque to push the tail plate 3 to move to complete the adjustment of the mold clamping force, it avoids the flash problem caused by too small force and also reduces the fatigue and damage caused by too large force.

[0035] In order to ensure high repeatable position accuracy and sufficient clamping force during the injection molding process, in one embodiment, the toggle mechanism 53 includes a connecting plate 531 and a plurality of toggles 532. One end of the connecting plate 531 is rotatably connected to the second plate 2, and the other end is rotatably connected to the same ends of the plurality of toggles 532. The other ends of the toggles 532 are rotatably connected to the tail plate 3. A connecting platform 533 is provided at one end of the toggle 532 close to the connecting plate 531, and the connecting platform 533 is rotatably connected to the crosshead 52. Through the geometric shape and kinematic characteristics of the toggle 532, the input driving force is converted into a greater clamping force to ensure the stability of the mold during the injection molding process. When the driving end moves along the direction of the toggle 532, a greater clamping force is generated at the other end point of the toggle 532 near the fulcrum. Due to the lever principle of the toggle 532, a small input force is converted into a greater output force through the geometric shape of the toggle 532. This design effectively improves the clamping force, enabling the mold to withstand higher pressure when closed, thus ensuring that the mold does not separate during the molding process.

[0036] In order to reduce the occurrence of poor position repeat accuracy and poor clamping force repeat accuracy caused by large deformation during the clamping process, in one embodiment, the thickness of the side wall of the tail plate 3 connected to the toggle mechanism 53 is greater than that of the side wall not connected to the toggle 532. During the clamping process, the clamping force is increased by the toggle mechanism 53. Therefore, the tail plate 3 will be subjected to the reaction force caused by the toggle mechanism 53 when providing the clamping force. So, in order to reduce the deformation of the tail plate 3 and thus provide the supporting force required for sufficient clamping force, the position of the tail plate 3 connected to the toggle 532 is thickened, so that its deformation is small during high-pressure injection. The overall design of the tail plate 3 is strengthened, and the side is strengthened to support, which can withstand high-speed impact, thus ensuring the accuracy of the clamping force.

[0037] Since the second plate 2 quickly completes the mold closing process, the clamping force is equivalent to the abutting force between the second plate 2 and the first plate 1. Therefore, in order to reduce the deformation of the second plate 2 during the high-pressure injection process and enable it to withstand higher-speed impact, in one embodiment, reinforcing ribs are provided on the opposite side walls of the second plate 2, and the connection points of the reinforcing ribs with the connecting plate 531 are correspondingly arranged. By designing the reinforcing ribs at the positions of the second plate 2 corresponding to the connecting plate 531, the rigidity and impact resistance of the second plate 2 are improved, thus ensuring that the second plate 2 can withstand greater impact during injection molding and clamping to reduce the occurrence of the second plate 2 breaking and affecting the product quality.

[0038] In order to reduce the frictional force generated when the second plate 2 slides with the pull rod 4, in one embodiment, the second plate 2 is slidably connected to the pull rod 4 through a graphite copper sleeve. The graphite copper sleeve is filled with lubricating oil. The circumferential hole of the graphite copper sleeve is inlaid with graphite. The graphite pores can accommodate the lubricating oil and release the lubrication of the graphite to the pull rod 4 in due time. The base material of the graphite copper sleeve, tin bronze, has good thermal conductivity, which can increase the PV value of the movement of the pull rod 4, avoid wearing the pull rod 4 and causing excessive energy consumption loss, and reduce the risk of fracture and failure of the pull rod 4.

[0039] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A clamping mechanism for a high-speed injection molding machine, characterized in that: It includes a head plate, a second plate, a tail plate, a pull rod, a driving mechanism, a temperature detection mechanism, a heat dissipation mechanism, a toggle mechanism, a mold adjustment mechanism and a control terminal. The pull rod passes through the tail plate and the second plate in sequence and is connected to the head plate. The mold adjustment mechanism is installed at the tail end of the tail plate and drives the tail plate to slide on the pull rod. The driving mechanism is installed at the tail end of the tail plate and the driving end is connected to the second plate through the toggle mechanism. The driving mechanism drives the second plate to slide on the pull rod through the toggle mechanism and cooperates with the head plate to complete the mold locking. The temperature detection mechanism is used to detect the temperature change of the driving mechanism during operation and is connected to the control terminal for communication. The heat dissipation mechanism is installed at the driving end of the driving mechanism and dissipates heat from the driving end. The driving mechanism includes a driving motor, a screw and a crosshead, the driving motor is installed at the tail end of the tail plate, the screw is connected to the output end of the driving motor, the crosshead is spirally connected to the screw, the crosshead is slidably connected to one end of the tail plate close to the second plate, one end of the toggle mechanism is rotatably connected to the crosshead and the tail plate, and the other end is connected to the second plate, the heat dissipation mechanism includes a heat conduction tube and a plurality of heat sinks, the heat conduction tube is embedded on one side of the crosshead close to the tail plate, and the plurality of heat sinks are circumferentially arranged on the side wall of the heat conduction tube; A groove is provided on one side wall of the heat-conducting tube close to the tail plate, a plurality of through holes are provided on the side wall of the groove, a heat-dissipating cavity is provided on one side of the heat-conducting tube close to the crosshead, and the heat-dissipating cavity is filled with coolant; The heat dissipation mechanism also includes a guide fan, which is rotatably connected to an end surface of the heat-conducting tube close to the tail plate; A pull rod deformation detector is provided at one end of the pull rod close to the head plate, and a temperature detector and a force sensor are provided on one side wall of the second plate close to the tail plate. The pull rod deformation detector, temperature detector and force sensor are all communicatively connected with the control terminal. The temperature detector is used to detect the temperature change of the pull rod during the clamping process of the second plate, and the force sensor is used to detect the resistance generated by the pull rod during the clamping process of the second plate. The control terminal adjusts the clamping force output by the mold adjustment mechanism according to the received transmission data.

2. The clamping mechanism of a high-speed injection molding machine according to claim 1, characterized in that: The mold adjusting mechanism includes a hydraulic motor, a transition gear and a mold adjusting nut group. The output end of the hydraulic motor is meshed with the transition gear, and the transition gear is rotatably connected to the tail end of the tail plate. The transition gears are respectively meshed with the outer rings of the mold adjusting nut group, and the inner ring of the mold adjusting nut group is connected to the pull rod. The hydraulic motor drives the transition gear so that the mold adjusting nut group drives the tail plate to adjust its position on the pull rod.

3. The clamping mechanism of a high-speed injection molding machine according to claim 1, characterized in that: The elbow mechanism includes a connecting plate and a plurality of elbows, one end of the connecting plate is rotatably connected to the two plates, and the other end is rotatably connected to the same end of the plurality of elbows, the other end of the elbow is rotatably connected to the tail plate, and a connecting platform is provided at one end of the elbow close to the connecting plate, and the connecting platform is rotatably connected to the crosshead.

4. The clamping mechanism of a high-speed injection molding machine according to claim 1, characterized in that: The side wall of the tail plate connected to the toggle mechanism is thicker than the side wall not connected to the toggle mechanism.

5. The clamping mechanism of a high-speed injection molding machine according to claim 1, characterized in that: Reinforcing ribs are arranged on opposite side walls of the two plates, and the reinforcing ribs are arranged corresponding to the connection points of the connecting plates.

6. The clamping mechanism of a high-speed injection molding machine according to claim 1, characterized in that: The two plates are slidably connected to the pull rod through a graphite copper sleeve, and the graphite copper sleeve is filled with lubricating oil.

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