Mould locking mechanism of high-speed injection molding machine

Abstract

The invention relates to a mold locking mechanism of a high-speed injection molding machine, and belongs to the technical field of injection molding. Comprising 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 rod mechanism, a mold adjusting mechanism and a control terminal, the pull rod sequentially penetrates through the tail plate and the second plate and is connected with the head plate, and the mold adjusting 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, the driving end is connected with the second plate through the toggle rod mechanism, the driving mechanism drives the second plate to slide on the pull rod through the toggle rod mechanism and is matched with the head plate to complete mold locking, and the temperature detection mechanism is used for detecting temperature changes of the driving mechanism in the operation process and is in communication connection with the control terminal. The heat dissipation mechanism is installed at the driving end of the driving mechanism and conducts heat dissipation on the driving end. The problem that in the injection molding process of an existing injection molding machine mold locking mechanism, due to rapid reciprocating motion, the temperature of a lead screw nut rises, and the lead screw nut is locked with a lead screw is solved.

Description

Technical Field

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

[0002] At present, in the plastic processing, metal die casting and rubber processing industries, the clamping devices used in injection molding equipment and die casting equipment mostly adopt two-platen type (referred to as two-platen machine). The two-platen clamping device has a simple and compact structure and is easy to use. The two-platen clamping device generally includes a movable platen, a fixed platen, a tie rod connected between the movable platen and the fixed platen and on which the movable platen moves, a clamping cylinder and a brake assembly.

[0003] In order to ensure that the existing two-plate clamping device has sufficient clamping force when squeezing the plastic melt into the clamping mechanism at high speed and high pressure, and to prevent the mold system from expanding and overflowing under the reaction force of the high-speed and high-pressure melt, affecting product quality, damaging the mold system, and damaging the clamping mechanism, it is necessary to adjust the mold to ensure the accuracy of the clamping system. The commonly used mold adjustment method is to keep the head plate fixed nut and rotate the tail plate mold adjustment nut group so that the nut drives the tail plate forward or backward relative to the pull rod, thereby adjusting the mold thickness. The mold adjustment nut group is usually composed of four mold adjustment nuts, which are generally driven simultaneously by a center large gear ring, and the center large gear ring is driven by a hydraulic or electric motor.

[0004] When a high-speed electric injection molding machine is performing injection molding, the second plate needs to move forward or backward quickly to complete the injection molding process. In this process, the electric motor needs to frequently drive the lead screw nut to rotate. A large amount of heat will be generated during the continuous rotation of the lead screw nut, which will cause the lead screw nut to temperature rise too high and deform, reducing the gap between the lead screw and the lead screw, thereby increasing the friction between the lead screw nut and the lead screw. In the continuous use process, the lead screw nut and the lead screw will be locked, thereby affecting the normal operation of the injection molding, the production line will be stopped, and economic losses will be caused. In addition, during the locking process of the lead screw nut, the friction increases, the mold may not be closed correctly, and the mold may be damaged or deformed, further increasing the maintenance cost. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a locking mechanism for a high-speed injection molding machine, which solves the problem that the screw nut of the existing injection molding machine is locked with the screw due to the high temperature caused by the rapid reciprocating movement during the injection molding process.

[0006] The purpose of the present invention can be achieved through the following technical solutions: a locking mechanism of a high-speed injection molding machine, comprising 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, wherein 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 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, and the heat dissipation mechanism is installed at the driving end of the driving mechanism and dissipates heat to 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 two plates, one end of the toggle mechanism is rotatably connected to the crosshead and the tail plate, and the other end is connected to the two plates, the heat dissipation mechanism includes a heat-conducting tube and a plurality of heat sinks, the heat-conducting tube is embedded in a 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-conducting tube.

[0007] As a preferred technical solution of the present invention, 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.

[0008] As a preferred technical solution of the present invention, the heat dissipation mechanism further includes a guide fan, and the guide fan is rotatably connected to an end surface of one side of the heat-conducting tube close to the tail plate.

[0009] As a preferred technical solution of the present invention, 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 to the control terminal. The temperature detector is used to detect the temperature change of the pull rod during the clamping process of the second plates, and the force sensor is used to detect the resistance generated by the pull rod during the clamping process of the second plates. The control terminal adjusts the clamping force output by the mold adjustment mechanism according to the received transmission data.

[0010] As a preferred technical solution of the present invention, 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, the transition gear is rotatably connected to the tail end of the tail plate, the transition gears are respectively meshed with the outer ring of the mold adjusting nut group, the inner ring of the mold adjusting nut group is connected to the pull rod, and 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.

[0011] As a preferred technical solution of the present invention, 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.

[0012] As a preferred technical solution of the present invention, the side wall of the tail plate connected to the toggle mechanism is thicker than the side wall not connected to the toggle mechanism.

[0013] As a preferred technical solution of the present invention, reinforcing ribs are provided on the opposite side walls of the two plates, and the reinforcing ribs are provided corresponding to the connection points of the connecting plates.

[0014] As a preferred technical solution of the present invention, the two plates are slidably connected to the pull rod via a graphite copper sleeve, and the graphite copper sleeve is filled with lubricating oil.

[0015] The beneficial effects of the present invention are: 1. The heat-conducting tube in the heat dissipation mechanism is embedded in the screw nut on the crosshead, and the heat generated on the screw nut is transferred to the heat-conducting tube. Then, a number of heat sinks installed on the heat-conducting tube are used to improve the heat dissipation effect of the screw nut, thereby reducing the heat accumulation on the screw nut. This solves the problem that the screw nut of the existing injection molding machine clamping mechanism is locked with the screw due to the high temperature caused by the rapid reciprocating movement during the injection molding process; 2. The temperature of the tie rod is detected by the temperature sensor and the resistance generated by the tie rod during the clamping process is detected by the force sensor. If both the temperature and the resistance increase, it means that the deformation of the tie rod has increased, resulting in an increase in the friction force of the second plate when sliding on the tie rod, thereby increasing the temperature of the tie rod. Therefore, after the second plate completes the clamping, the clamping force at this time will be less than the preset value, and as the fatigue of the tie rod increases, the deformation of the tie rod at this time is different from the deformation of the tie rod in the normal state during the clamping process. Therefore, when the clamping force is adjusted by the mold adjustment mechanism, the control terminal uses the temperature change of the tie rod and the resistance change value to allow the clamping mechanism to be adjusted more accurately, so that the clamping force can be the same as the preset value during the clamping process, thereby effectively protecting the system and avoiding the situation where the clamping force overload causes greater damage to the tie rod, thereby increasing the service life of the tie rod and solving the problem that the quality of the final product is affected by the uneven force of the four tie rods or insufficient clamping force during the clamping process of the existing injection molding machine clamping mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the tailgate structure of the present invention; Figure 3 It is a schematic diagram of the structure of the toggle mechanism of the present invention; Figure 4 It is a schematic diagram of the heat dissipation mechanism structure of the present invention; Main component symbols In the figure: 1. head plate; 2. second plate; 3. tail plate; 4. pull rod; 5. driving mechanism; 51. driving motor; 52. crosshead; 53. elbow mechanism; 531. connecting plate; 532. elbow; 533. connecting table; 54. screw; 6. mold adjustment mechanism; 61. hydraulic motor; 62. transition gear; 63. mold adjustment nut set; 7. heat dissipation mechanism; 71. heat sink; 72. heat conducting tube; 721. heat dissipation cavity; 722. groove; 723. through hole; 73. guide fan; 8. pull rod deformation detector. DETAILED DESCRIPTION

[0018] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0019] See also Figure 1-Figure 4 The present embodiment provides a locking mechanism of a high-speed injection molding machine, including a head plate 1, a second plate 2, a tail plate 3, a tie rod 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 rod 4 passes through the tail plate 3 and the second plate 2 in sequence and is connected to the head plate 1. The mold adjustment mechanism 6 is installed at the tail end of the tail plate 3 and drives the tail plate 3 to slide on the tie rod 4. The driving mechanism 5 is installed at the tail end of the tail plate 3 and the driving end is connected to the second plate 2 through the toggle mechanism 53. The driving mechanism 5 drives the toggle mechanism 53 to rotate to drive the second plate 2 to slide on the tie rod 4 and cooperate with the head plate 1 to complete the locking 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 promote the injection molding process of the second plate 2. The injection molding process is fast, which causes the driving end to generate a large amount of heat during the continuous friction process. 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, the driving end will be deformed, resulting in a decrease in the gap with the driving shaft, thereby increasing the friction between the driving shaft, and further increasing the heat generated, resulting in a continuous decrease in the gap between the driving end and the driving shaft, and then reaching a locking situation.

[0020] The heat dissipation mechanism 7 is installed at the driving end of the driving mechanism 5 to dissipate the heat of 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 activated to stop the injection molding process, so that the temperature of the driving end can be controlled and the heat can be dissipated, thereby avoiding the situation where the driving end is locked due to excessive resistance during movement.

[0021] In order to better dissipate heat at the driving end, the driving mechanism 5 includes a driving motor 51, a crosshead 52, a toggle mechanism 53 and a screw 54. The driving motor 51 is installed at the tail end of the tail plate 3, the screw 54 is connected to the output end of the driving motor 51, the crosshead 52 is spirally connected to the 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 opening the mold, the control system gives a command to the driving motor 51, and the screw nut is driven to push the cross The head 52 drives the second plate 2 to move to open the mold. During this period, the high-sensitivity position sensor feeds back the position of the second plate 2 in real time. The control system adjusts the command to the drive motor 51, drives the screw nut to link the crosshead 52, controls the moving position speed of the second plate 2, and realizes controllable and programmable moving speed and position. The high-speed mold opening position accuracy reaches 0.01.mm, and the second plate 2 is accurately controlled to reach the set mold opening position. The mold opening and closing crosshead 52 is driven by the drive motor 51 to output power, and the drive screw nut pushes the crosshead 52 to realize the opening and closing of the clamping mechanism. The torque of the drive motor 51 , the speed can be controlled by programming, with fast speed, fast response, accurate position, high thrust repetition accuracy, high screw nut transmission efficiency and energy saving. During the injection molding process, the screw 54 needs to be rotated frequently to allow the cross head 52 to move back and forth to complete the injection molding process. During this process, the screw nut connected to the screw 54 on the cross head 52 will generate a lot of heat during the continuous movement. Therefore, in order to avoid the accumulation of heat causing the screw nut to reach the low-temperature tempering temperature (120°), and this process is irreversible, deformation occurs and reduces The gap between the screw rods 54 causes the friction force to increase continuously and eventually cause locking. The heat-conducting tube 72 in the heat dissipation mechanism 7 is embedded in the screw nut on the cross head 52, and the heat generated on the screw nut is transferred to the heat-conducting tube 72. Then, a plurality of heat sinks 71 installed on the heat-conducting tube 72 are used to improve the heat dissipation effect of the screw nut, thereby reducing the heat accumulation on the screw nut, thereby solving the problem of locking with the screw rod 54 due to the temperature increase caused by the rapid reciprocating movement of the screw nut in the existing injection molding machine locking mechanism during the injection molding process.

[0022] However, since the screw nut is embedded in the cross head 52, and the space gap between the cross head 52 and the tail plate 3 is small, the air flow in the space between the cross head 52 and the tail plate 3 is poor during the injection molding process, resulting in the heat on the screw nut cannot be dissipated in time, thereby causing heat accumulation. Therefore, in order to improve the heat dissipation effect of the screw nut, in one embodiment, a groove 722 is formed on one side wall of the heat conducting tube 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 one side of the heat conducting tube 72 close to the cross head 52, and the heat dissipation cavity 721 is filled with coolant. During the injection molding process, the screw nut is produced The generated heat will be transferred by the heat-conducting tube 72 to be dissipated through the heat sink 71. At the same time, the coolant filled in the heat-conducting tube 72 will also transfer heat. In addition, by providing a groove 722 and a through hole 723 at a position away from the heat source on the heat-conducting tube 72, when the heat-conducting tube 72 and the heat sink 71 are dissipating heat, the heat source is on the side close to the crosshead 52, while the side close to the tail plate 3 is an area with a lower temperature. Therefore, due to the heat transfer effect, the air flow will enter from the through hole 723 close to the heat source and then flow out from the through hole 723 far away from the heat source, thereby forming a chimney effect, strengthening the air circulation of the heat sink 71, accelerating the heat dissipation efficiency, and improving the heat dissipation effect.

[0023] Although the air circulation in the heat-conducting tube 72 is improved by the through hole 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 also includes a guide fan 73, and the guide fan 73 is rotatably connected to the end surface of one side of the heat-conducting tube 72 close to the tail plate 3. During the movement of the crosshead 52, the guide fan 73 will be driven by the driven airflow, thereby generating forced convection, accelerating the transfer of heat from the heat-conducting tube 72 to the air, overcoming the limitation of natural convection, and allowing the air circulation inside the heat-conducting tube 72 to continue, thereby ensuring a continuous heat dissipation effect, thereby improving the heat dissipation efficiency of the heat dissipation mechanism 7.

[0024] When the temperature detection mechanism detects that the temperature of the driving end has reached a threshold value, in order to avoid the deviation of the friction force between the pull rod 4 and the second plate 2 during the clamping process due to insufficient output force of the driving end, thereby causing the clamping force of the mold adjusting mechanism 6 to be inconsistent with the deformation of the pull rod 4, resulting in overload of the clamping force and damage to the mold system and the 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 head plate 1, and a temperature detector and a force sensor are provided on one side wall of the second plate 2 close to the tail plate 3. The pull rod deformation detector 8, the temperature detector and the force sensor are all communicatively connected to the control terminal, and the control terminal adjusts the clamping force output by the mold adjusting mechanism 6 according to the received transmission data, and adjusts the clamping force during the injection molding process. During the molding process, the driving mechanism 5 will drive the second plate 2 to move toward the head plate 1 to complete the mold locking and then perform the injection molding process. After the mold locking is completed, it is necessary to ensure that the mold locking force reaches the preset value and remains stable during the injection molding process. Therefore, when the second plate 2 and the head plate 1 complete the mold locking, the tie rod deformation detector 8 will detect the deformation of the tie rod 4 to obtain whether the mold locking force at this time meets the standard. If the mold locking force at this time does not reach the preset value, the mold adjustment mechanism 6 will drive the tail plate 3 to move toward the head plate 1, so that the mold locking force between the second plate 2 and the head plate 1 gradually increases to reach the preset value. At the same time, during the mold locking process, the temperature detector will detect the temperature of the tie rod 4, and the force sensor will detect the temperature of the second plate 2 The resistance generated between the tie rod 4 and the tie rod 4 during the clamping process. If the temperature and resistance increase of the tie rod 4 during the clamping process are greater than those in the previous clamping process, at this time, when the mold adjusting mechanism 6 adjusts the clamping force, the adjustment force of the mold adjusting mechanism 6 will be slowed down to avoid excessive impact on the tie rod 4 due to excessive speed during adjustment, thereby accelerating fatigue damage to the tie rod 4. In addition, the temperature of the tie rod 4 is detected by a temperature sensor, and the resistance generated by the tie rod 4 during the clamping process is detected by a force sensor. If both the temperature rise and the resistance increase, then this means that the deformation of the tie rod 4 has increased, resulting in an increase in the friction force on the second plate 2 when sliding on the tie rod 4. The temperature of the tie rod 4 is increased, thereby increasing the temperature of the tie rod 4. Therefore, after the second plate 2 completes the mold locking, the clamping force at this time will be less than the preset value, and as the fatigue degree of the tie rod 4 increases, the deformation of the tie rod 4 at this time is different from the deformation of the tie rod 4 in the normal state during the mold locking process. Therefore, when the clamping force is adjusted by the mold adjusting mechanism 6 at this time, the control terminal uses the temperature change of the tie rod 4 and the resistance change value to allow the clamping mechanism to complete the adjustment more accurately, so that the clamping force can be the same as the preset value during the mold closing process, thereby effectively protecting the system, avoiding the situation where the clamping force overload causes greater damage to the tie rod 4, and increasing the service life of the tie rod 4.

[0025] In order to better detect the condition of the tie rod 4 and ensure that the injection molding process can proceed smoothly, in the present embodiment, four tie rods 4 are provided, and each of the four tie rods 4 is independently provided with a tie rod deformation detector 8, and a temperature detector and a force sensor are provided one by one corresponding to the four tie rods 4. During the injection molding process, under an ideal state, the tie rod 4 will not be affected by the additional friction caused by the two plates 2. However, there will be assembly errors in the assembly process of the tie rod 4, and at the same time, the assembly errors of the two plates 2 will also affect the tie rod 4 during the clamping process. Therefore, each tie rod 4 will produce different conditions during the injection molding process. Therefore, the condition of each tie rod 4 is detected by using independently provided tie rod deformation detectors 8, temperature detectors and force sensors, so as to better judge the condition of each tie rod 4 during the injection molding clamping process, thereby avoiding excessive tensile deviation of the tie rod 4 with the largest load due to continuous impact during clamping, thereby reducing the occurrence of abnormal use of the tie rod 4.

[0026] In order to more accurately control the size of the clamping force, avoid the problem of overflow due to too small clamping force affecting product quality, and also avoid the situation where the clamping force is too large and the impact force on the pull rod 4 is too large, resulting in increased fatigue, in one embodiment, the mold adjustment mechanism 6 includes a hydraulic motor 61, a transition gear 62 and a mold adjustment nut group 63, the output end of the hydraulic motor 61 is meshed with the transition gear 62, the transition gear 62 is rotatably connected to the tail end of the tail plate 3, the transition gear 62 is respectively meshed with the outer ring of the mold adjustment nut group 63, and the mold adjustment nut group 6 The inner ring 3 is connected to the tie rod 4, and the hydraulic motor 61 drives the transition gear 62 to make the mold adjusting nut group 63 drive the tail plate 3 to adjust the position on the tie rod 4. When adjusting the clamping force, the hydraulic motor 61 drives the transition gear 62 to rotate, thereby driving the mold adjusting nut group 63 to rotate to move the tail plate 3 toward the direction of the head plate 1 to adjust the clamping force. The hydraulic motor 61 outputs a higher torque to push the tail plate 3 to move to complete the adjustment of the clamping force, thereby avoiding the overflow problem caused by too little force and reducing the fatigue and damage caused by too much force.

[0027] In order to ensure that high repeatability position accuracy can be achieved during the injection molding process while sufficient clamping force can be output, in one embodiment, the elbow mechanism 53 includes a connecting plate 531 and a plurality of elbows 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 end of the plurality of elbows 532, the other end of the elbow 532 is rotatably connected to the tail plate 3, and a connecting platform 533 is provided at one end of the elbow 532 near 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 elbow 532, the input driving force is converted into a larger clamping force to ensure the stability of the mold during the injection molding process, and when the driving end moves along the direction of the elbow 532, the other end of the elbow 532 generates a larger clamping force near the fulcrum. Due to the lever principle of the elbow 532, a small input force is converted into a larger output force through the geometric shape of the elbow 532. This design effectively improves the clamping force, so that it can withstand higher pressure when the mold is closed, thereby ensuring that the mold will not separate during the molding process.

[0028] In order to reduce the occurrence of poor position repeatability and clamping force repeatability due to large deformation during the clamping process, in one embodiment, the thickness of the side wall of the tail plate 3 connected to the elbow mechanism 53 is greater than the side wall not connected to the elbow 532. When clamping, the clamping force is increased by the elbow mechanism 53. Therefore, the tail plate 3 will be subjected to the reaction force caused by the elbow mechanism 53 when providing the clamping force. Therefore, in order to reduce the deformation of the tail plate 3 and provide sufficient supporting force required for the clamping force, the position where the tail plate 3 is connected to the elbow 532 is thickened to reduce the deformation during high-pressure injection. The tail plate 3 is designed to be strengthened as a whole, and the side support is strengthened to withstand high-speed impact, thereby ensuring the accuracy of the clamping force.

[0029] Since the second plate 2 quickly completes the mold closing process, the clamping force is equivalent to the abutment force between the second plate 2 and the head plate 1. Therefore, in order to reduce the deformation of the second plate 2 during high-pressure injection so that it can withstand higher-speed impact, in one embodiment, reinforcing ribs are provided on the opposite side walls of the second plate 2, and the reinforcing ribs are provided corresponding to the connection points of the connecting plate 531. By designing 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, thereby ensuring that the second plate 2 can withstand greater impact during injection clamping to reduce the occurrence of breakage of the second plate 2 and affect product quality.

[0030] In order to reduce the friction generated when the two plates 2 slide with the pull rod 4, in one embodiment, the two plates 2 are slidably connected to the pull rod 4 through a graphite copper sleeve, the graphite copper sleeve is filled with lubricating oil, the circumferential holes of the graphite copper sleeve are inlaid with graphite, the graphite pores can accommodate the lubricating oil and release the graphite in time to lubricate the pull rod 4, the base material tin bronze of the graphite copper sleeve has good thermal conductivity, which can improve the PV value of the movement of the pull rod 4, avoid wear of the pull rod 4 and cause excessive energy loss, and reduce the risk of breakage and failure of the pull rod 4.

[0031] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution 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 cross head, and the heat-dissipating cavity is filled with coolant.

2. The clamping mechanism of a high-speed injection molding machine according to claim 1, characterized in that: 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.

3. The clamping mechanism of a high-speed injection molding machine according to claim 1, characterized in that: 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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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