Mould locking mechanism

Abstract

The utility model relates to a mold locking mechanism which comprises an upper mold plate and a lower mold plate, and a mold locking space is formed between the upper mold plate and the lower mold plate; the mold locking power source comprises a mold locking cylinder, the mold locking cylinder drives the upper mold plate and the lower mold plate to move in the opposite direction or the reverse direction to complete mold locking and mold opening actions, the mold locking cylinder comprises a cylinder body, a small oil cavity, a large oil cavity and a piston rod, the small oil cavity and the large oil cavity are arranged in the cylinder body, the piston rod is arranged in the small oil cavity in a sliding mode, and the small oil cavity is communicated with the large oil cavity. The cylinder body is provided with an extending oil inlet communicated with the small oil cavity, a retracting oil inlet communicated with the large oil cavity and a pressurizing opening communicated with the large oil cavity. When the upper die plate and the lower die plate are controlled to be locked, oil is supplied to the small oil cavity through the extending oil inlet, the piston rod is pushed to quickly extend out, oil is supplied to the large oil cavity through the pressurizing opening, and the extending pressure of the piston rod is increased. According to the utility model, the mold locking pressure can be improved and the mold locking stability can be ensured while the rapid mold locking is met.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to a mold locking mechanism. Background Art

[0002] Injection molding machine refers to a method in which the heated and melted material is injected into the mold cavity by high pressure, and after cooling and solidification, a molded product is obtained. The basic principle is to use the extrudability and plasticity of plastics to inject the molten plastic into the plastic product mold by pressure, and cool and mold to obtain the desired various plastic parts. This method is suitable for mass production of parts with complex shapes and is one of the important processing methods for injection plastic products. The injection molding process can be roughly divided into the following 7 stages: feeding melt plasticization, mold closing, clamping, injection, pressure holding, cooling and mold opening. At present, the injection molding machines on the market are generally divided into vertical injection molding machines and horizontal injection molding machines according to the arrangement of injection methods and clamping methods. Vertical injection molding machines are widely used by users due to their small footprint, convenient feeding, easy molding, high stability, simple structure and other advantages. Therefore, people have invented many types of vertical injection molding machines.

[0003] Due to the high injection pressure of this type of injection molding machine, huge pressure is generated in the mold cavity at the moment of injection. If the clamping force is insufficient, the product will cause flash, thus affecting the quality of the product. In order to increase the clamping force, the clamping mechanism of the existing vertical injection molding machine is mostly a manual crank clamping clamping mechanism. The mechanism is bulky, and it is laborious to open and close the mold. The clamping force is completely generated by the crank force-enhancing mechanism. The force required to complete the clamping action is very large, the labor intensity of the workers is high, the efficiency is low, and the production cost is high. Moreover, when opening the mold, due to the existence of the clamping force, the crank retracts from the straight state at the moment, and the crank force-enhancing mechanism releases the pressure to generate a reaction force to quickly reset the movable mold. In serious cases, the workers may accidentally have their hands pressed by the mold, causing unnecessary personal safety accidents. Utility Model Content

[0004] To this end, the technical problem to be solved by the utility model is to overcome the problem of insufficient clamping pressure of the clamping mechanism in the prior art, and to provide a clamping mechanism that can increase the clamping pressure and ensure the stability of the clamping while meeting the requirements of rapid clamping.

[0005] In order to solve the above technical problems, the utility model provides a clamping mechanism, comprising:

[0006] An upper mold plate and a lower mold plate, wherein a locking mold space is formed between the upper mold plate and the lower mold plate;

[0007] A clamping power source includes a clamping cylinder, which drives the upper mold plate and the lower mold plate to move toward or in the opposite direction to complete the clamping and opening actions. The clamping cylinder includes a cylinder body, a small oil chamber and a large oil chamber arranged in the cylinder body, and a piston rod slidably arranged in the small oil chamber. The small oil chamber and the large oil chamber are connected. The cylinder body is provided with an extending oil inlet connected to the small oil chamber, a retracting oil inlet connected to the large oil chamber, and a pressurizing port connected to the large oil chamber.

[0008] Wherein: when controlling the clamping of the upper and lower mold plates, firstly, the small oil chamber is supplied with oil through the extended oil inlet to push the piston rod to extend quickly, and then the large oil chamber is supplied with oil through the boost port to increase the pressure of the piston rod extension.

[0009] In one embodiment of the utility model, it also includes: a support frame, the lower template is fixed on the support frame, the piston rod of the locking cylinder is connected to the upper template, and the locking cylinder drives the upper template to move towards or away from the lower template.

[0010] In one embodiment of the utility model, it also includes a plurality of guide columns, which are slidably disposed in the lower template, one end of which is connected to the clamping cylinder, and the other end of which is connected to the upper template.

[0011] In one embodiment of the present invention, a heating device is provided in the lower template.

[0012] In one embodiment of the utility model, an injection port is provided on the upper mold plate.

[0013] In one embodiment of the present invention, a product detection device is also provided on the lower template.

[0014] In one embodiment of the utility model, the clamping power source further comprises:

[0015] An oil tank connected to the extending oil inlet, the retracting oil inlet and the boost port;

[0016] An oil supply valve group is connected with the oil tank and the extension oil inlet, the retraction oil inlet and the boost port. A directional control valve is arranged in the oil supply valve group, and the directional control valve controls the switching of different oil circuits in the clamping cylinder.

[0017] The oil supply power source is connected to the oil tank to control the oil supply speed and pressure in the clamping cylinder.

[0018] In one embodiment of the utility model, a temperature detection device is provided in the oil tank.

[0019] In one embodiment of the utility model, the clamping power source further includes a cooling device, which is connected to the oil supply valve group and can reduce the oil supply temperature.

[0020] In one embodiment of the utility model, a hydraulic lock and a balance valve are also provided in the oil supply valve group.

[0021] The above technical solution of the utility model has the following advantages compared with the prior art:

[0022] The clamping mechanism described in the utility model is provided with a clamping power source having two connected oil chambers, and a piston rod is arranged in one of the smaller oil chambers. When controlling the clamping of the upper and lower templates, the small oil chamber is supplied with oil first to push the piston rod to extend quickly, so as to realize the rapid positioning of the material. After ensuring that the position of the material is fixed, the large oil chamber is supplied with oil to increase the pressure of the piston rod extension, thereby increasing the clamping pressure, improving the stability of the clamping mechanism in clamping the material, and ensuring that the clamping mechanism can provide a sufficiently large clamping force to resist the injection pressure of the injection molding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein:

[0024] Figure 1 It is a schematic diagram of the overall structure of the clamping mechanism of the utility model;

[0025] Figure 2 It is a schematic diagram of the internal structure of the clamping cylinder of the utility model;

[0026] Figure 3 It is a structural schematic diagram of the upper template and the lower template of the utility model;

[0027] Figure 4 It is a structural schematic diagram of the clamping power source of the utility model.

[0028] Explanation of the markings in the drawings in the specification: 1. Upper mold plate; 2. Lower mold plate; 3. Locking cylinder; 301. Cylinder body; 302. Small oil chamber; 303. Large oil chamber; 304. Piston rod; 305. Extending oil inlet; 306. Retracting oil inlet; 307. Boosting port; 4. Support frame; 5. Guide column; 6. Product inspection device; 7. Injection port; 8. Heating device; 9. Oil tank; 10. Oil supply valve group; 11. Oil supply power source; 12. Cooling device. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0030] Reference Figure 1 As shown, the utility model discloses a clamping mechanism, comprising: an upper template 1, a lower template 2 and a clamping power source, wherein the upper template 1 and the lower template 2 are arranged correspondingly, a clamping space is formed between the upper template 1 and the lower template 2, and the material to be injected is placed in the clamping space, and the clamping power source drives the upper template 1 and the lower template 2 to move toward or in the opposite direction to achieve clamping of the material to be injected, thereby completing the actions of clamping and opening the mold.

[0031] Reference Figure 2 As shown, in this embodiment, the clamping power source includes a clamping cylinder 3, and the clamping cylinder 3 includes: a cylinder body 301, a small oil chamber 302 and a large oil chamber 303 arranged in the cylinder body 301, and a piston rod 304 slidably arranged in the small oil chamber 302, the small oil chamber 302 and the large oil chamber 303 are connected, and the cylinder body 301 is provided with an extending oil inlet 305 connected to the small oil chamber 302, a retracting oil inlet 306 connected to the large oil chamber 303, and a pressurizing port 307 connected to the large oil chamber 303;

[0032] Wherein: when controlling the clamping of the upper mold plate 1 and the lower mold plate 2, firstly supply oil to the small oil chamber 302 through the extended oil inlet 305, push the piston rod 304 to extend quickly, so as to realize the rapid positioning of the material, and after ensuring the material position is fixed, supply oil to the large oil chamber 303 through the booster port 307, increase the pressure of the piston rod 304 to extend, thereby increase the clamping pressure, improve the stability of the clamping mechanism to clamp the material, and ensure that the clamping mechanism can provide a sufficiently large clamping force to resist the injection pressure of the injection molding machine;

[0033] When controlling the upper mold plate 1 and the lower mold plate 2 to open the mold, the oil in the large oil chamber 303 is first extracted through the boost port 307 for pressure relief, and then the large oil chamber 303 is supplied with oil through the retraction oil inlet 306 to push the piston rod 304 to retract and complete the mold opening action.

[0034] Reference Figure 3 As shown, in this embodiment, the locking mechanism also includes a support frame 4, the lower template 2 is fixed on the support frame 4, the piston rod 304 of the locking cylinder 3 is connected to the upper template 1, and the locking cylinder 3 drives the upper template 1 to move toward or away from the lower template 2.

[0035] In other embodiments, the upper template 1 may be fixed, and the piston rod 304 of the clamping cylinder 3 may be connected to the lower template 2 , so that the clamping cylinder 3 drives the lower template 2 to move toward or away from the upper template 1 .

[0036] Specifically, in this embodiment, in order to enhance the stability of the clamping of the upper template 1 and the lower template 2, a plurality of guide columns 5 are further arranged between the upper template 1 and the lower template 2, and the guide columns 5 are slidably penetrated in the lower template 2, one end of the guide columns 5 is connected to the clamping cylinder 3, and the other end of the guide columns 5 is connected to the upper template 1, and the clamping cylinder 3 transmits power to the upper template 1 through the guide columns 5, and the moving direction of the upper template 1 is limited by the guide columns 5, thereby ensuring the direction of the force applied during clamping, and also ensuring the stability of the force applied.

[0037] Specifically, a product detection device 6 is also provided on the lower mold plate 2. The product detection device 6 is a photoelectric sensor. Only when the product detection device 6 detects the material, the clamping mechanism can perform the clamping action, which can improve the safety of the clamping mechanism and prevent the occurrence of incorrect clamping.

[0038] Specifically, in this embodiment, the clamping mechanism is used in an injection molding machine, so the clamping mechanism is used to fix the part to be injected. In order to realize the injection molding of the part to be injected, an injection port 7 is opened on the upper template 1. When injecting into the part to be injected, in order to ensure the fluidity of the injection material, a certain temperature needs to be maintained. Therefore, a heating device 8 is provided in the lower template 2.

[0039] Reference Figure 4 As shown, the clamping power source also includes: an oil tank 9, an oil supply valve group 10 and an oil supply power source 11, wherein: the oil tank 9 is connected with the extending oil inlet 305, the retracting oil inlet 306 and the boost port 307 through an oil pipeline, the oil supply valve group 10 is on the oil pipeline, and a directional control valve is arranged in the oil supply valve group 10, and the directional control valve controls the switching of different oil circuits in the clamping cylinder 3, so as to realize the actions of quickly pushing out the piston rod 304, applying pressure to the piston rod 304, relieving pressure and recovering the piston rod 304, and the oil supply power source 11 is connected with the oil tank 9, and the oil supply power source 11 controls the oil supply speed and pressure in the clamping cylinder 3.

[0040] Specifically, when supplying oil to the locking cylinder 3, in order to ensure the stability of the operation of the locking cylinder 3, it is necessary to control the oil temperature of the oil supply. Therefore, a temperature detection device is provided in the oil tank 9, which can monitor the oil temperature in the oil tank 9 in real time, and the locking power source is also provided with a cooling device 12, and the cooling device 12 is connected to the oil supply valve group 10. The cooling device 12 can reduce the oil supply temperature, and the switch of the cooling device 12 is controlled according to the real-time temperature detected by the temperature detection device.

[0041] Specifically, the oil supply valve group 10 is also provided with a hydraulic lock and a balance valve to ensure the safety and stability of the oil cylinder movement.

[0042] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A clamping mechanism, characterized in that: include: An upper mold plate and a lower mold plate, wherein a locking mold space is formed between the upper mold plate and the lower mold plate; The clamping power source includes a clamping cylinder, which drives the upper mold plate and the lower mold plate to move toward or in the opposite direction to complete the clamping and opening actions. The clamping cylinder includes: a cylinder body, a small oil chamber and a large oil chamber arranged in the cylinder body, and a piston rod slidably arranged in the small oil chamber. The small oil chamber and the large oil chamber are connected. The cylinder body is provided with an extending oil inlet connected to the small oil chamber, a retracting oil inlet connected to the large oil chamber, and a booster port connected to the large oil chamber.

2. The clamping mechanism according to claim 1, characterized in that: Also includes: A support frame, the lower template is fixed on the support frame, the piston rod of the clamping cylinder is connected to the upper template, and the clamping cylinder drives the upper template to move towards or away from the lower template.

3. The clamping mechanism according to claim 2, characterized in that: It also includes a plurality of guide columns, which are slidably arranged in the lower mold plate, one end of which is connected to the clamping cylinder, and the other end of which is connected to the upper mold plate.

4. The clamping mechanism according to claim 1, characterized in that: A heating device is arranged in the lower template.

5. The clamping mechanism according to claim 1, characterized in that: An injection port is provided on the upper mold plate.

6. The clamping mechanism according to claim 1, characterized in that: A product detection device is also arranged on the lower template.

7. The clamping mechanism according to claim 1, characterized in that: The locking power source also includes: An oil tank connected to the extending oil inlet, the retracting oil inlet and the boost port; An oil supply valve group is connected with the oil tank and the extension oil inlet, the retraction oil inlet and the boost port. A directional control valve is arranged in the oil supply valve group, and the directional control valve controls the switching of different oil circuits in the clamping cylinder. The oil supply power source is connected to the oil tank to control the oil supply speed and pressure in the clamping cylinder.

8. The clamping mechanism according to claim 7, characterized in that: A temperature detection device is arranged in the oil tank.

9. The clamping mechanism according to claim 7, characterized in that: The clamping power source further comprises a cooling device, which is communicated with the oil supply valve group and can reduce the oil supply temperature.

10. The clamping mechanism according to claim 7, characterized in that: A hydraulic lock and a balance valve are also arranged in the oil supply valve group.

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