Quick mold changing device of injection molding machine

Abstract

The invention relates to the technical field of injection molding machines, in particular to a quick mold changing device of an injection molding machine, which comprises a base, an electromagnet I is arranged in the base, the electromagnet I is used for adsorbing and positioning a mold, a lock catch for locking the mold is arranged on the base, and a buffer device and a swing limiting device are arranged on the base. The buffer device is used for centralizing a mold to a mold mounting surface of the injection molding machine by virtue of elastic force and hydraulic force, and the swing limiting device is used for balancing the elastic force of the buffer device; the buffering device comprises an installation hole formed in the base, a hydraulic cylinder is fixedly installed in the installation hole, a piston rod of the hydraulic cylinder is provided with a starting switch, and the starting switch is electrically connected with the hydraulic cylinder. A buffer spring is fixedly installed in the installation hole and arranged on the hydraulic cylinder in a sleeving mode. The problem that the mold mounting surface of the injection molding machine is damaged due to swinging of the mold in the hoisting process is solved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, in particular to a rapid mold changing device for an injection molding machine. Background Art

[0002] Injection molding machines are the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. Injection molding has a simple process, convenient operation, and is easy to form components of complex shapes. Therefore, injection molding machines are also widely used in today's manufacturing industry.

[0003] For an injection molding machine, the mold is an indispensable component in its working process, and different molds are required for the production of different components. In the prior art, there is an injection molding machine of the form shown in the patent number: CN115674614B, and the patent name is: A mold assembly and an injection molding machine. The mold is generally installed by bolt fixing and electromagnetic suction cup fixing to achieve rapid replacement of the mold. These two installation methods have their own advantages and disadvantages, but both require the use of a crane to move the mold for replacement and installation. The mold is prone to swing during the lifting process, so it may collide with the injection molding machine body during the lifting and moving process, causing damage to the mold installation surface of the injection molding machine, which may affect the installation accuracy of the mold.

[0004] Therefore, a quick mold changing device for an injection molding machine is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a quick mold changing device for an injection molding machine, so as to solve the problem that the mold mounting surface of the injection molding machine is damaged due to the swing of the mold of the injection molding machine during the hoisting process.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A quick mold changing device for an injection molding machine comprises a base, wherein an electromagnet is arranged inside the base, the electromagnet is used for adsorbing and positioning the mold, a lock buckle for locking the mold is arranged on the base, and a buffer device and a swing limiting device are arranged on the base.

[0008] Based on this scheme, when replacing the mold of the injection molding machine, after removing the old mold, when the new mold is hoisted into the injection molding machine by means of a crane, the new mold swings due to the hoisting movement, and when it attempts to collide with the base of the injection molding machine, the buffer device will use the hydraulic pressure and elastic force to apply a force in the opposite direction of the collision to the mold, so as to buffer the swing of the mold, thereby preventing the mold from colliding with the injection molding machine during the swing, thereby preventing the mold from being damaged on the mold mounting surface of the injection molding machine, thereby ensuring the installation accuracy of the mold. At the same time, since the force applied by the buffer device may cause additional swinging of the mold, a swing limiting device is provided to offset the swing of the mold caused by the buffer device, thereby ensuring the stability of the mold during the hoisting process, preventing the mold from swinging and colliding with the injection molding machine, thereby preventing the mold from being damaged on the mold mounting surface of the injection molding machine, thereby ensuring the installation accuracy of the mold.

[0009] After the mold is acted upon by the above device, the mold can be moved smoothly and slowly to the predetermined installation position. Subsequently, the operator can start the electromagnet 1 through the injection molding machine's own control system, so that the electromagnet 1 can firmly adsorb and position the mold, and then lock the mold through the lock, thereby completing the installation of the mold.

[0010] Preferably, the buffer device includes a mounting hole opened on the base, a hydraulic cylinder is fixedly installed in the mounting hole, a starting switch is provided on the piston rod of the hydraulic cylinder, and the starting switch is electrically connected to the hydraulic cylinder; a buffer spring is fixedly installed in the mounting hole, the buffer spring is sleeved on the hydraulic cylinder, and a top block is fixedly installed on the other end of the buffer spring.

[0011] With this setting, when the hoisted mold is close to the mold mounting surface on the injection molding machine, if the mold swings, the mold will first contact the top block when swinging toward the mold mounting surface, and then the buffer spring will be compressed, so the elastic force generated by the buffer spring can initially reduce the kinetic energy of the mold swing. Then, when the buffer spring is compressed to a certain length, the top block will abut against one end of the piston rod of the hydraulic cylinder. At this time, the top block triggers the start switch, and the hydraulic cylinder will move smoothly. Therefore, the hydraulic cylinder and the buffer spring work together to allow the mold to be smoothly and slowly docked to the mold mounting surface, avoiding the mold from hitting the mold mounting surface, protecting the mold and the mold mounting surface from being damaged due to the impact, and thus ensuring the installation accuracy of the mold.

[0012] It is worth noting that the buffering effect of the buffer spring on the mold also helps to protect the piston rod of the hydraulic cylinder from being damaged by impact. Specifically, after the swinging mold hits the top block, the top block will move under the push of the mold until it collides with the piston rod of the hydraulic cylinder, and the elastic force of the buffer spring will use the elastic force to weaken the impact force before the collision occurs, thereby reducing the impact force on the piston rod, which is conducive to ensuring that the piston rod is not damaged.

[0013] Preferably, the swing limiting device includes a limit ring fixedly installed in the mounting hole, and a limit block 1 is fixedly installed on one end of the top block connected to the buffer spring, and the limit block 1 is against the limit ring; an electromagnet 2 is fixedly installed in the top block, and the starting switch is electrically connected to the electromagnet 2.

[0014] When hoisting the mold, after the crane carrying the mold reaches the designated position, the mold and the crane are not on the same vertical plane, so the hoisting rope on the crane forms an angle with the vertical direction. When the crane stops, the mold will try to reach the position on the same vertical plane as the crane by swinging. However, after the mold swings to contact with the top block, it still has not reached the position on the same vertical plane as the crane. Therefore, the mold will generate a thrust on the top block in the axial direction of the top block, and the thrust will gradually weaken as the mold gradually approaches the position on the same vertical plane as the crane, until the mold is completely corrected (that is, moved to the position on the same vertical plane as the crane), the thrust of the mold on the top block in the horizontal direction, that is, the axial direction of the top block, will drop to zero. At this time, the elastic force of the buffer spring will push the mold away from the designated installation position, thereby interfering with the installation and positioning of the mold.

[0015] Therefore, this scheme is set up. Through this setting, when the swinging mold pushes the top block to collide with the piston rod of the hydraulic cylinder, the start switch on the piston rod will start the electromagnet 2, so that the two ends of the electromagnet 2 are respectively adsorbed on the mold and the piston rod of the hydraulic cylinder, so that the top block, the mold and the piston rod of the hydraulic cylinder are fixed to each other. At this time, the elastic force of the buffer spring will be balanced by the magnetic force of the electromagnet 2, so that even after the position of the mold is corrected, the elastic force of the buffer spring cannot push the mold outward, thereby ensuring the accurate positioning of the mold during the installation process. Subsequently, the hydraulic cylinder gradually retracts its piston rod under computer control, so that the mold can be slowly and steadily placed on the mold installation surface of the injection molding machine, thereby avoiding damage to the mold installation surface of the injection molding machine and ensuring the installation accuracy of the mold.

[0016] During the process of hoisting the mold, the hydraulic cylinder pushes the piston rod outward under the control of the computer system, and at the same time, the buffer spring pushes the top block mounting hole outward, thereby preparing for the buffer operation. At this time, the limit block always abuts against the limit ring, thereby preventing the top block from falling out of the mounting hole, ensuring the reliability of the present invention. In addition, since there is no need to worry about the top block falling out of the mounting hole, the buffer spring can be set with a certain preload according to actual production needs, thereby better realizing its buffering function.

[0017] Preferably, a plurality of blowing holes are symmetrically provided on the base, an air pump is fixedly mounted on the base, a ventilation pipe is fixedly mounted on each of the blowing holes, and the other end of each of the ventilation pipes is fixedly connected to the air pump; a proximity switch is fixedly mounted on the top block, and the proximity switch is electrically connected to the air pump; the blowing holes are used to guide the gas output by the air pump to spray toward the mold when replacing the mold.

[0018] With this arrangement, when the mold swings close to the top block, the proximity switch is triggered, thereby starting the air pump to pump pressurized gas into the vent pipe. The pressurized gas is finally ejected through the blowing hole and blown onto the side of the mold, thereby slowing down the swing speed of the mold, thereby reducing the impact force when the mold collides with the top block. Thus, the risk of damage to the second electromagnet due to the collision between the mold and the top block is reduced, and the reliability and stability of the present invention are improved. In addition, since the impact force of the mold on the top block is reduced, the magnitude of the impact force that the buffer spring needs to buffer during operation is also reduced, so a buffer spring with a smaller elastic modulus can be selected. Therefore, the magnetic force that the second electromagnet in the swing limiting device needs to have to offset the elastic force of the buffer spring will also be reduced, thereby helping to reduce the risk of damage to the electronic components around the second electromagnet due to magnetic interference.

[0019] Preferably, a gas tank is fixedly mounted on the base, the output end of the air pump is fixedly mounted on the gas tank, and a one-way valve 1 is provided at the connection between the output end of the air pump and the gas tank; a one-way valve 2 is fixedly mounted on the end of the ventilation pipe that is not connected to the blowing hole, and the one-way valve 2 is fixedly mounted on the gas tank, and the gas tank controls the gas to enter the ventilation pipe through the one-way valve 2.

[0020] With this arrangement, when the air pump introduces pressurized gas into the vent pipe, the pressurized gas pumped out by the air pump will first overcome the resistance of the one-way valve 1 and enter the gas tank, until the air pressure in the gas tank increases to a level sufficient to break through the one-way valve 2, the pressurized gas in the gas tank will be able to enter each vent pipe, and finally blow out from each blowing hole. Thus, the gas tank can be used as a pre-storage container for pressurized gas, thereby ensuring that each blowing hole can synchronously blow out gas with equal pressure, which in turn helps ensure that the mold can maintain uniform and equal force when it is acted upon by the gas blown out by multiple blowing holes, helps avoid additional shaking of the mold, and helps protect the mold and the mold mounting surface from being damaged by impact, thereby ensuring the installation accuracy of the mold.

[0021] Preferably, a gas tank is fixedly mounted on the base, the end of the ventilation pipe not connected to the blowing hole is fixedly mounted on the gas tank, and the ventilation pipe is connected to the inside of the gas tank; a swirl part is provided in the gas tank, and the output end of the air pump is fixedly mounted on the swirl part.

[0022] With this arrangement, when the air pump introduces pressurized gas into the vent pipe, the pressurized gas pumped out by the air pump will first enter the gas tank, then pass through the vent pipe and finally blow out from the blow hole. As the amount of pressurized gas pumped out by the air pump increases, the overall air pressure in the gas tank will increase and eventually stabilize, so the gas blown out of the blow hole can also maintain a uniform pressure, which helps to ensure that the mold can maintain a uniform and equal force when it is acted upon by the gas blown out of multiple blow holes, avoiding additional shaking of the mold, and protecting the mold and the mold installation surface from being damaged by impact, thereby ensuring the installation accuracy of the mold.

[0023] In addition, the swirl portion provided can guide the high-pressure gas pumped out by the air pump to change its flow direction, thereby transforming the airflow into turbulence, so that the kinetic energy of the gas can offset each other, reducing the impact of the pressurized gas pumped out by the air pump on the inner wall of the gas tank, and helping to extend the service life of the gas tank.

[0024] However, in this scheme, the overall air pressure in the gas tank needs to increase to a stable state in order to ensure that the pressure of the gas blown out of multiple blowing holes is equal. Therefore, the volume of the gas tank should be as small as possible within the design allowable range to shorten the time required for the overall air pressure in the gas tank to increase to a stable state, thereby ensuring the reliability of the present invention.

[0025] However, compared with the previous solution, the advantage of this solution is that there is no need to store pressurized gas in the injection molding machine for a long time, which helps to avoid various equipment risks caused by pressurized gas and helps to improve the safety of the equipment.

[0026] Preferably, the top block is fixedly mounted with a second limit block, the base is provided with a receiving groove, the receiving groove is connected with the mounting hole, and the receiving groove is used to receive the second limit block; a micro switch is fixedly mounted at the bottom of the receiving groove, and the micro switch is electrically connected with the hydraulic cylinder. The second limit block is provided with a buffer pad, and the buffer pad is used to abut against the mold; the buffer pad has a sheet portion on one side for abutting against the mold.

[0027] Through this arrangement, when the top block is pushed into the mold and pulled into the direction of the mounting hole by the hydraulic cylinder, the second limit block on the top block will be able to fall into the receiving groove and finally abut against the micro switch to trigger the micro switch, so that the hydraulic cylinder is closed and the hydraulic cylinder stops contracting. In this way, the problem of damage to the buffer spring caused by excessive contraction of the hydraulic cylinder is avoided. In addition, since the micro switch must be triggered to stop the contraction of the hydraulic cylinder, such an arrangement also helps to ensure that the hydraulic cylinder completely receives the top block into the mounting hole and the receiving groove, thereby avoiding the problem of affecting the mold assembly accuracy due to the top block protruding outside the mold mounting surface. In addition, by providing a buffer pad and a sheet portion, the deformation of the buffer pad and the sheet portion can be used when the mold contacts the top block to avoid a rigid collision between the mold and the top block, which helps to protect the top block from damage due to impact and prolong the service life of the top block.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. By providing a buffer device and a swing limiting device, when the present invention is replacing the mold of the injection molding machine, when the new mold attempts to collide with the base of the injection molding machine due to swing, the buffer device will use hydraulic pressure and elastic force to buffer the swing of the mold, thereby preventing the mold from colliding with the injection molding machine when swinging. At the same time, the swing limiting device offsets the swing of other molds caused by the buffer device, ensures the stability of the mold during the hoisting process, prevents the mold from colliding with the injection molding machine due to the swing, and thereby prevents the mold installation surface of the injection molding machine from being damaged, thereby ensuring the installation accuracy of the mold.

[0030] 2. By setting the blowing hole, when the mold swings close to the top block, the pressurized gas will be ejected from the blowing hole and blown onto the side of the mold, thereby slowing down the swinging speed of the mold, thereby reducing the impact force when the mold collides with the top block. In this way, the risk of damage to the electromagnet 2 due to the collision between the mold and the top block is reduced, and the reliability and stability of the present invention are improved. And therefore, a buffer spring with a smaller elastic modulus can be selected, so the magnetism of the electromagnet 2 can also be designed to be smaller, which helps to reduce the risk of damage to the electronic components around the electromagnet 2 due to magnetic interference.

[0031] 3. By setting up a gas tank, it can be used as a pre-storage container for pressurized gas, thereby ensuring that each blowing hole can synchronously blow out gas with equal pressure, which helps to ensure that the mold can maintain uniform and equal force when it is affected by the gas blown out by multiple blowing holes, helps to avoid additional shaking of the mold, and is beneficial to protect the mold and the mold installation surface from being damaged due to impact, thereby ensuring the installation accuracy of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the installation position of the present invention on an injection molding machine;

[0033] Figure 2 It is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0034] Figure 3 for Figure 2 A schematic diagram of a plan view cutaway of a main view;

[0035] Figure 4 for Figure 3 A partial enlarged schematic diagram of part A;

[0036] Figure 5 is a schematic diagram of the overall structure of a gas tank in a first embodiment of the present invention;

[0037] Figure 6 is a schematic diagram of the overall structure of a gas tank in a second embodiment of the present invention;

[0038] Figure 7 is a schematic structural diagram of a swirl portion in a second embodiment of the present invention;

[0039] Figure 8 Schematic diagram of the internal structure of the swirl part.

[0040] In the figure: 1. Injection molding machine body; 2. Base; 3. Top block; 4. Mold mounting surface; 21. Blowing hole; 22. Gas tank; 23. Electromagnet 1; 24. Check valve 2; 25. Hydraulic cylinder; 31. Proximity switch; 32. Buffer pad; 33. Sheet part; 34. Limit block 1; 35. Limit block 2; 36. Electromagnet 2; 37. Mounting hole; 221. Check valve 1; 222. Ventilation pipe; 223. Swirl part; 224. Output port; 225. Air inlet; 251. Start switch; 371. Limit ring; 372. Accommodating groove; 373. Micro switch; 374. Buffer spring. DETAILED DESCRIPTION

[0041] The following content will use the drawings listed in the aforementioned "Description of Drawings" section to clearly explain the specific implementation methods of the present invention, in the hope that readers can have a more complete and objective understanding of the working principle of the present invention and the corresponding technical effects.

[0042] like Figures 1 to 5 As shown, a specific implementation of the present invention is shown. Among them, several points need to be explained in advance: First, because the description of the workflow of the present invention inevitably requires the introduction of an injection molding machine for the convenience of explanation, and the present invention needs to be installed on an injection molding machine, the mold installation surface 4 of the injection molding machine mentioned below is actually a side wall surface of the base 2 of the present invention that docks with the mold; second, the proximity switch 31 is fixedly installed inside the limit block 2 35, and the detection end of the proximity switch 31 extends out of the buffer pad 32; third, the air pump and the lock are mature existing technologies, so they are not specially shown in the drawings. At the same time, the connection between the air pump and the components of its related fluid system is connected by pipelines;

[0043] When the present invention is installed, first, the base 2 is fixedly installed on the injection molding machine, and then an electromagnet 23 is set in the base 2. The electromagnet 23 is used to adsorb and position the mold. A lock for locking the mold is set on the base 2. A buffer device and a swing limiting device are set on the base 2.

[0044] The buffer device includes a mounting hole 37 provided on the base 2, a hydraulic cylinder 25 is fixedly installed in the mounting hole 37, a start switch 251 is provided on the piston rod of the hydraulic cylinder 25; a buffer spring 374 is fixedly installed in the mounting hole 37, the buffer spring 374 is sleeved on the hydraulic cylinder 25, and a top block 3 is fixedly installed on the other end of the buffer spring 374. The swing limiting device includes a limit ring 371 fixedly installed in the mounting hole 37, a limit block 1 34 is fixedly installed on one end of the top block 3 connected to the buffer spring 374, and the limit block 1 34 abuts against the limit ring 371; an electromagnet 2 36 is fixedly installed in the top block 3, and the start switch 251 is electrically connected to the electromagnet 2 36.

[0045] A plurality of blowing holes 21 are symmetrically provided on the base 2, an air pump is fixedly installed on the base 2, a vent pipe 222 is fixedly installed on each blowing hole 21, and the other end of each vent pipe 222 is fixedly connected to the air pump; a proximity switch 31 is fixedly installed on the top block 3, and the proximity switch 31 is electrically connected to the air pump; the blowing hole 21 is used to guide the gas output by the air pump to spray toward the mold when the mold is replaced. A gas tank 22 is fixedly installed on the base 2, the output end of the air pump is fixedly installed on the gas tank 22, and a one-way valve 221 is provided at the connection between the output end of the air pump and the gas tank 22; a one-way valve 24 is fixedly installed on the end of the vent pipe 222 that is not connected to the blowing hole 21, and the one-way valve 24 is fixedly installed on the gas tank 22, and the gas tank 22 controls the gas to enter the vent pipe 222 through the one-way valve 24. A second limit block 35 is fixedly mounted on the top block 3, and a receiving groove 372 is provided on the base 2. The receiving groove 372 is connected to the mounting hole 37, and the receiving groove 372 is used to accommodate the second limit block 35; a micro switch 373 is fixedly mounted at the bottom of the receiving groove 372, and the micro switch 373 is electrically connected to the hydraulic cylinder 25. A buffer pad 32 is provided on the second limit block 35, and the buffer pad 32 is used to abut against the mold; the buffer pad 32 has a sheet portion 33 on one side for abutting against the mold. The gas tank 22 can be used as a pre-storage container for pressurized gas, so as to ensure that each blowing hole 21 can synchronously blow out gas with equal pressure, thereby helping to ensure that the mold can maintain uniform and equal force when it is affected by the gas blown out by multiple blowing holes 21, helping to avoid additional shaking of the mold, and protecting the mold and the mold mounting surface 4 from being damaged due to impact, thereby ensuring the installation accuracy of the mold.

[0046] When the present invention is working, first, after removing the old mold, when the new mold is hoisted into the injection molding machine by means of a crane, the new mold swings due to the hoisting movement, and when it attempts to collide with the base 2 of the injection molding machine, the buffer device will use the hydraulic pressure and elastic force to apply a force in the opposite direction of the collision to the mold, so as to produce a buffering effect on the swing of the mold, thereby preventing the mold from colliding with the injection molding machine during the swing, thereby preventing the mold from being damaged by the mold mounting surface 4 of the injection molding machine, thereby ensuring the installation accuracy of the mold. At the same time, since the force applied by the buffer device may cause another swing of the mold, a swing limiting device is provided to offset the swing of the mold caused by the buffer device, ensure the stability of the mold during the hoisting process, and prevent the mold from swinging and colliding with the injection molding machine, thereby preventing the mold mounting surface 4 of the injection molding machine from being damaged, thereby ensuring the installation accuracy of the mold. After the mold is acted upon by the above device, the mold can be smoothly and slowly moved to the predetermined installation position. Subsequently, the operator can start the electromagnet 23 through the injection molding machine's own control system, so that the electromagnet 23 can firmly adsorb and position the mold, and then lock the mold through the lock, thereby completing the installation of the mold.

[0047] When the hoisted mold is close to the mold mounting surface 4 on the injection molding machine, if the mold swings, the mold will first contact the top block 3 when swinging toward the mold mounting surface 4, and then the buffer spring 374 will be compressed, so the elastic force generated by the buffer spring 374 can initially reduce the kinetic energy of the mold swing. Then, when the buffer spring 374 is compressed to a certain length, the top block 3 will abut against one end of the piston rod of the hydraulic cylinder 25. At this time, the top block 3 triggers the start switch 251, and the hydraulic cylinder 25 will move smoothly. Therefore, the hydraulic cylinder 25 and the buffer spring 374 work together to allow the mold to be smoothly and slowly docked to the mold mounting surface 4, avoiding the mold from hitting the mold mounting surface 4, so as to protect the mold and the mold mounting surface 4 from being damaged due to the impact, thereby ensuring the installation accuracy of the mold.

[0048] When the mold is hoisted, after the crane carrying the mold reaches the designated position, the mold and the crane are not on the same vertical plane, so the hoisting rope on the crane forms an angle with the vertical direction. When the crane stops, the mold will try to reach the position on the same vertical plane as the crane by swinging. At this time, after the mold swings to abut against the top block 3, it still has not reached the position on the same vertical plane as the crane. Therefore, the mold will generate a thrust on the top block 3 in the axial direction of the top block 3, and the thrust will gradually weaken as the mold gradually approaches the position on the same vertical plane as the crane, until the mold is completely corrected (i.e., moved to the position on the same vertical plane as the crane), the thrust of the mold on the top block 3 in the horizontal direction, i.e., the axial direction of the top block 3, will drop to zero. At this time, the elastic force of the buffer spring 374 will push the mold away from the designated installation position, thereby interfering with the installation and positioning of the mold.

[0049] Therefore, a swing limiting device is provided. With this arrangement, when the swinging mold pushes the top block 3 to contact the piston rod of the hydraulic cylinder 25, the start switch 251 on the piston rod will start the electromagnet 2 36, so that the two ends of the electromagnet 2 36 are respectively adsorbed on the mold and the piston rod of the hydraulic cylinder 25, thereby fixing the top block 3, the mold and the piston rod of the hydraulic cylinder 25 to each other. At this time, the elastic force of the buffer spring 374 will be balanced by the magnetic force of the electromagnet 2 36, so that even after the position of the mold is corrected, the elastic force of the buffer spring 374 cannot push the mold outward, thereby ensuring the accurate positioning of the mold during the installation process. Subsequently, the hydraulic cylinder 25 gradually retracts its piston rod under computer control, so that the mold can be slowly and steadily placed on the mold mounting surface 4 of the injection molding machine, thereby avoiding damage to the mold mounting surface 4 of the injection molding machine and ensuring the installation accuracy of the mold.

[0050] During the process of hoisting the mold, the hydraulic cylinder 25 pushes the piston rod outward under the control of the computer system, and at the same time, the buffer spring 374 pushes the mounting hole 37 of the top block 3 outward, thereby preparing for the buffer operation. At this time, the limit block 34 is against the limit ring 371, thereby preventing the top block 3 from falling out of the mounting hole 37, ensuring the reliability of the present invention. In addition, since there is no need to worry about the top block 3 falling out of the mounting hole 37, the buffer spring 374 can be set with a certain preload according to actual production needs, thereby better realizing its buffering function.

[0051] In addition, when the mold swings close to the top block 3, the proximity switch 31 is triggered, thereby starting the air pump to pump pressurized gas into the vent pipe 222. The pressurized gas is finally ejected through the blowing hole 21 and blown onto the side of the mold, thereby slowing down the swing speed of the mold, thereby reducing the impact force when the mold collides with the top block 3. Thus, the risk of damage to the electromagnet 2 36 due to the collision between the mold and the top block 3 is reduced, and the reliability and stability of the present invention are improved. In addition, since the impact force of the mold on the top block 3 is reduced, the magnitude of the impact force that the buffer spring 374 needs to buffer during operation is also reduced, so a buffer spring 374 with a smaller elastic modulus can be selected. Therefore, the magnetic force that the electromagnet 2 36 in the swing limiting device needs to have to offset the elastic force of the buffer spring 374 will also be reduced, thereby helping to reduce the risk of damage to the electronic components around the electromagnet 2 36 due to magnetic interference.

[0052] like Figures 6 to 8 As shown, the second embodiment of the present invention is shown, which is different from the first embodiment of the present invention in that the gas tank 22 is no longer provided with a one-way valve 1 221 and a one-way valve 2 24, but is provided with a swirl portion 223, which is provided at the connection between the gas tank 22 and the air pump. Among them, the vent pipe 222 connected to the air pump will be fixedly connected to the air inlet 225. Therefore, in the swirl portion 223, the gas pumped out of the air pump enters the swirl portion 223 through the air inlet 225, and rotates and collides with each other along the inner wall of the swirl portion 223, thereby forming turbulence, and then flows out from the output port 224 and enters the gas tank 22.

[0053] When the air pump introduces pressurized gas into the vent pipe 222, the pressurized gas pumped out by the air pump will first enter the gas tank 22, then pass through the vent pipe 222 and finally be blown out from the blowing hole 21. As the amount of pressurized gas pumped out by the air pump increases, the overall air pressure in the gas tank 22 will increase and eventually stabilize, so that the gas blown out of the blowing hole 21 can also maintain a uniform pressure, which helps to ensure that the mold can maintain a uniform and equal force when it is acted upon by the gas blown out of multiple blowing holes 21, avoids additional shaking of the mold, and is conducive to protecting the mold and the mold mounting surface 4 from being damaged due to impact, thereby ensuring the installation accuracy of the mold.

[0054] In addition, the swirl portion 223 can guide the high-pressure gas pumped out by the air pump to change its flow direction, so that the kinetic energy of the gas offsets each other, reducing the impact of the pressurized gas pumped out by the air pump on the inner wall of the gas tank 22, which helps to extend the service life of the gas tank 22.

[0055] However, in this solution, the pressure of the gas blown out of the multiple blowing holes 21 can be ensured to be equal only when the overall air pressure in the gas tank 22 increases to a stable state. Therefore, the volume of the gas tank 22 should be as small as possible within the design allowable range to shorten the time required for the overall air pressure in the gas tank 22 to increase to a stable state, thereby ensuring the reliability of the present invention. However, compared with the previous solution, the advantage of this solution is that there is no need to store pressurized gas in the injection molding machine for a long time, which is conducive to avoiding various equipment risks caused by pressurized gas and helping to improve the safety of the equipment.

[0056] It should be emphasized that, based on the contents recorded in the above text, although the beneficial effects of the present invention have been elaborated in detail and corresponding specific implementation methods have been provided for this purpose, ordinary technicians in this field can still make conventional substitutions, deformations, etc. based on the given technical solutions without creative labor to achieve the same technical effects, based on the full understanding of the working principle of the present invention, but this should not be considered to exceed the scope of the present invention. Specifically, the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A quick mold changing device for an injection molding machine, comprising a base (2), wherein an electromagnet (23) is arranged inside the base (2), wherein the electromagnet (23) is used to adsorb and position the mold, and a lock for locking the mold is arranged on the base (2), wherein the lock is characterized in that: The base (2) is provided with a buffer device and a swing limiting device, the buffer device uses elastic force and hydraulic pressure to straighten the mold onto the injection molding machine, and the swing limiting device is used to balance the elastic force of the buffer device.

2. A quick mold changing device for an injection molding machine according to claim 1, characterized in that: The buffer device comprises a mounting hole (37) provided on the base (2), a hydraulic cylinder (25) being fixedly mounted in the mounting hole (37), a start switch (251) being provided on the piston rod of the hydraulic cylinder (25), and the start switch (251) being electrically connected to the hydraulic cylinder (25); a buffer spring (374) being fixedly mounted in the mounting hole (37), the buffer spring (374) being sleeved on the hydraulic cylinder (25), and a top block (3) being fixedly mounted on the other end of the buffer spring (374).

3. A quick mold changing device for an injection molding machine according to claim 2, characterized in that: The swing limiting device comprises a limiting ring (371) fixedly mounted in the mounting hole (37); a limiting block (34) is fixedly mounted on one end of the top block (3) connected to the buffer spring (374); the limiting block (34) abuts against the limiting ring (371); an electromagnet (36) is fixedly mounted in the top block (3); and the starting switch (251) is electrically connected to the electromagnet (36).

4. A quick mold changing device for an injection molding machine according to claim 3, characterized in that: The base (2) is symmetrically provided with a plurality of blowing holes (21); an air pump is fixedly mounted on the base (2); a ventilation pipe (222) is fixedly mounted on each of the blowing holes (21); the other end of each of the ventilation pipes (222) is fixedly connected to the air pump; a proximity switch (31) is fixedly mounted on the top block (3); the proximity switch (31) is electrically connected to the air pump; the blowing holes (21) are used to guide the gas output by the air pump to be sprayed toward the mold when the mold is replaced.

5. A quick mold changing device for an injection molding machine according to claim 4, characterized in that: A gas tank (22) is fixedly mounted on the base (2); the output end of the air pump is fixedly mounted on the gas tank (22); a first check valve (221) is provided at the connection between the output end of the air pump and the gas tank (22); a second check valve (24) is fixedly mounted on the end of the ventilation pipe (222) that is not connected to the blowing hole (21); the second check valve (24) is fixedly mounted on the gas tank (22); and the gas tank (22) controls the passage of gas into the ventilation pipe (222) through the second check valve (24).

6. A quick mold changing device for an injection molding machine according to claim 4, characterized in that: An air tank (22) is fixedly mounted on the base (2); an end of the vent pipe (222) not connected to the air blowing hole (21) is fixedly mounted on the air tank (22), and the vent pipe (222) is communicated with the interior of the air tank (22); a swirl portion (223) is provided inside the air tank (22), and an output end of the air pump is fixedly mounted on the swirl portion (223).

7. A quick mold changing device for an injection molding machine according to claim 4, characterized in that: The top block (3) is fixedly mounted with a second limit block (35); the base (2) is provided with a receiving groove (372), the receiving groove (372) is communicated with the mounting hole (37), and the receiving groove (372) is used to receive the second limit block (35); a micro switch (373) is fixedly mounted at the bottom end of the receiving groove (372), and the micro switch (373) is electrically connected to the hydraulic cylinder (25).

8. A quick mold changing device for an injection molding machine according to claim 7, characterized in that: The second limit block (35) is provided with a buffer pad (32), and the buffer pad (32) is used to abut against the mold; the buffer pad (32) has a sheet portion (33) on one side thereof that is used to abut against the mold.

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