Oil press capable of rapidly opening and closing mold

Abstract

The utility model relates to an oil press capable of quickly opening and closing a die. The fixed mold plate is used for installing a lower mold, the top plate is arranged above the fixed mold plate, the movable mold plate is located between the fixed mold plate and the top plate and used for installing an upper mold, the guide columns are used for connecting the fixed mold plate and the top plate and penetrate through the movable mold plate, and the lifting mechanism is arranged on the top plate and used for driving the movable mold plate to ascend and descend. The lifting mechanism comprises a pressurizing oil cylinder and a mold closing oil cylinder which are respectively and vertically arranged on the top plate and are connected with the movable mold plate; the pressurizing oil cylinder is a single-rod type piston oil cylinder; the mold closing oil cylinder is a single-action oil cylinder; the cylinder diameter of the mold closing oil cylinder is smaller than that of the pressurizing oil cylinder; due to the fact that the upper cavity of the pressurizing oil cylinder is a rodless cavity, large in projection area and large in mold locking force, the lower cavity of the pressurizing oil cylinder is a rod cavity, small in projection area and high in mold opening speed, meanwhile, the single-action mold closing oil cylinder is utilized, the mold closing speed can be increased, the defect that the pressurizing oil cylinder is low in mold closing speed is overcome, and the pressurizing oil cylinder has the advantages of being low in manufacturing cost, small in manufacturing difficulty, simple, clear and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil press technical field especially refers to a quick open and close mould's oil press. BACKGROUND

[0002] As the core equipment of metal and nonmetal part riveting, stretching, punching and other processes, the performance of the lifting mechanism of the oil press directly affects the processing efficiency and forming quality.

[0003] To realize the quick open and close mould action, the traditional lifting mechanism mainly adopts two technical schemes of sub-mother cylinder or hydraulic differential oil circuit; wherein, the sub-mother cylinder structure promotes the speed through the coordinated action of the large and small cylinder bodies, but it has the following defects: on the one hand, the sub-mother cylinder needs precision machining and assembly, resulting in high manufacturing cost and high process complexity; on the other hand, the multi-cylinder structure is easy to cause leakage risk due to the fitting gap or sealing failure, and the long-term operation stability is insufficient. Although the hydraulic differential oil circuit scheme realizes the quick action through the differential principle of the oil circuit, the pressure drop caused by the switching of the oil flow at the moment of system starting will lead to unstable power output, which is manifested as action jamming and incoherent running, which not only affects the processing precision and efficiency, but also aggravates the element wear due to hydraulic impact. SUMMARY

[0004] The utility model aims at overcoming the defects of prior art and provides a quick open and close mould's oil press.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of a quick open and close mould's oil press, which comprises a fixed die plate for installing a lower die, a top plate arranged above the fixed die plate, a movable die plate for installing an upper die between the fixed die plate and the top plate, a plurality of guide columns for connecting the fixed die plate and the top plate and penetrating through the movable die plate, and a lifting mechanism arranged on the top plate for driving the movable die plate to lift.

[0006] The lifting mechanism comprises a booster cylinder and a closing cylinder which are vertically arranged on the top plate and connected with the movable die plate respectively, and a hydraulic system arranged on the top plate for supplying oil to the booster cylinder and the closing cylinder respectively.

[0007] The booster cylinder is a single-rod piston cylinder, the closing cylinder is a single-acting cylinder, and the cylinder diameter of the closing cylinder is smaller than that of the booster cylinder.

[0008] Preferably, the closing cylinder is located at the center of the top plate, and the booster cylinder is provided with two and symmetrically located on both sides of the closing cylinder.

[0009] Preferably, the sum of the projection areas of the lower cavities of the two booster cylinders is equal to the projection area of the cavity of the closing cylinder.

[0010] Preferably, the safety self-locking mechanism comprises a safety rod vertically arranged on the movable die plate and penetrating through the top plate, a plurality of clamping grooves vertically and uniformly arranged on the safety rod, a self-locking oil cylinder horizontally arranged on the top plate, and a clamping block arranged on the driving end of the self-locking oil cylinder and used for extending into the clamping groove.

[0011] Preferably, the displacement sensor is vertically arranged on the top plate and has a measuring end penetrating through the top plate and connected with the movable die plate.

[0012] Preferably, the hydraulic system is provided with a counterbalance valve on the hydraulic oil circuit.

[0013] Compared with the prior art, the hydraulic press has the following advantages due to the use of the above technical scheme:

[0014] In the hydraulic press, the upper cavity of the booster oil cylinder is a rodless cavity with a large projection area and a large locking force, the lower cavity is a rod cavity with a small projection area and a high mold opening speed, the single-acting mold closing oil cylinder is used to improve the mold closing speed and make up for the low mold closing speed of the booster oil cylinder, and the hydraulic press has the advantages of low manufacturing cost, small manufacturing difficulty, simplicity, etc. BRIEF DESCRIPTION OF DRAWINGS

[0015] The technical scheme of the hydraulic press will be further described below in combination with the drawings:

[0016] ATTACHED Figure 1 FIG. 1 is a structural schematic view of the hydraulic press according to the present application;

[0017] ATTACHED Figure 2 FIG. 2 is a sectional view of the hydraulic press according to the present application;

[0018] ATTACHED Figure 3 FIG. 3 is an enlarged view of part A in FIG. 1. Figure 2

[0019] 1, fixed die plate; 2, top plate; 3, movable die plate; 4, guide column; 5, lifting mechanism; 51, booster oil cylinder; 52, mold closing oil cylinder; 6, safety self-locking mechanism; 61, safety rod; 62, clamping groove; 63, self-locking oil cylinder; 64, clamping block; 7, displacement sensor. DETAILED DESCRIPTION

[0020] The hydraulic press will be further described below in combination with the drawings and specific embodiments.

[0021] ATTACHED Figures 1-3 ​The hydraulic press for quick mold opening and closing described in this utility model includes a fixed template 1 for installing the lower mold, a top plate 2 disposed above the fixed template 1, a movable template 3 located between the fixed template 1 and the top plate 2 for installing the upper mold, multiple guide columns 4 for connecting the fixed template 1 and the top plate 2 and passing through the movable template 3, and a lifting mechanism 5 disposed on the top plate 2 for driving the movable template 3 to rise and fall.

[0022] The lifting mechanism 5 includes a booster cylinder 51 and a mold closing cylinder 52, which are respectively vertically mounted on the top plate 2 and connected to the moving template 3, and a hydraulic system (not shown in the figure) mounted on the top plate 2 for supplying oil to the booster cylinder 51 and the mold closing cylinder 52 respectively.

[0023] The booster cylinder 51 is a single-rod piston cylinder; the mold closing cylinder 52 is a single-acting cylinder; the diameter of the mold closing cylinder 52 is smaller than the diameter of the booster cylinder 51.

[0024] During mold closing: The hydraulic system supplies oil to the upper chambers of the booster cylinder 51 and the mold closing cylinder 52 respectively. Since the cylinder diameter of the mold closing cylinder 52 is smaller than that of the booster cylinder 51, the mold closing speed can be increased, which can make up for the low mold closing speed of the booster cylinder 51. After the mold closing is completed, the mold is locked by the booster cylinder 51.

[0025] During mold opening: oil is supplied to the lower chamber of the booster cylinder 51 through the hydraulic system. Since the lower chamber of the booster cylinder 51 is a rod-type chamber with a small projected area, the mold opening speed is fast. The mold closing cylinder 52 is a single-acting cylinder, which is only used for the mold closing action.

[0026] The hydraulic system is existing technology and will not be described in detail.

[0027] Furthermore, the mold clamping cylinder 52 is located at the center of the top plate 2; two pressure boosting cylinders 51 are provided, and they are symmetrically located on both sides of the mold clamping cylinder 52; this structural design not only makes the moving platen 3 more evenly stressed, but also provides a large clamping force.

[0028] Furthermore, the sum of the projected areas of the lower cavities of the two booster cylinders 51 is equal to the projected area of ​​the cavity of the mold closing cylinder 52, so that the opening and closing speeds are the same.

[0029] Furthermore, it also includes a safety self-locking mechanism 6; the safety self-locking mechanism 6 includes a safety rod 61 vertically installed on the moving template 3 and passing through the top plate 2, a plurality of slots 62 evenly spaced vertically on the safety rod 61, a self-locking cylinder 63 horizontally installed on the top plate 2, and a locking block 64 installed at the driving end of the self-locking cylinder 63 for extending into the slot 62.

[0030] After the mold is opened, the self-locking cylinder 63 can drive the locking block 64 to extend into the corresponding slot 62 to complete the self-locking, preventing the moving template 3 from suddenly falling and causing a safety accident when the staff loads or unloads materials.

[0031] Furthermore, it also includes a displacement sensor 7; the displacement sensor 7 is vertically mounted on the top plate 2, and its measuring end passes through the top plate 2 and is connected to the moving template 3; during the lifting and lowering process, the moving template 3 can accurately measure its lifting and lowering position through the displacement sensor 7, which is convenient for control.

[0032] Furthermore, the hydraulic system is equipped with a counterbalancing valve on the hydraulic oil circuit, which can counteract the self-weight of the vertical cavity equipment. That is, the area of ​​the booster cylinder multiplied by the set system pressure equals the self-weight of the equipment.

[0033] The above are merely specific application examples of this utility model and do not constitute any limitation on the scope of protection of this utility model. All technical solutions formed by equivalent transformations or equivalent substitutions fall within the scope of protection of this utility model.

Claims

1. A quick opening and closing die oil press characterized by: The die set comprises a fixed die plate for mounting a lower die, a top plate arranged above the fixed die plate, a movable die plate for mounting an upper die between the fixed die plate and the top plate, a plurality of guide columns for connecting the fixed die plate and the top plate and penetrating through the movable die plate, and a lifting mechanism arranged on the top plate for driving the movable die plate to lift and descend; The lifting mechanism comprises a booster oil cylinder and a clamping oil cylinder arranged vertically on the top plate and connected with the movable die plate respectively, and a hydraulic system arranged on the top plate for supplying oil to the booster oil cylinder and the clamping oil cylinder respectively. The booster oil cylinder is a single-rod piston oil cylinder, and the clamping oil cylinder is a single-acting oil cylinder; the cylinder diameter of the clamping oil cylinder is smaller than that of the booster oil cylinder.

2. The quick opening and closing die oil press according to claim 1, characterized by: The clamping oil cylinder is arranged at the center of the top plate, and the booster oil cylinder is arranged in two and symmetrically arranged on both sides of the clamping oil cylinder.

3. The quick opening and closing die oil press according to claim 2, characterized by: The sum of the projection areas of the lower cavities of the two booster oil cylinders is equal to the projection area of the cavity of the clamping oil cylinder.

4. The rapid opening and closing mold oil press according to any one of claims 1 to 3, characterized by: The safety self-locking mechanism comprises a safety rod arranged vertically on the movable die plate and penetrating through the top plate, a plurality of clamping grooves arranged vertically and uniformly on the safety rod, a self-locking oil cylinder arranged horizontally on the top plate, and a clamping block arranged on the driving end of the self-locking oil cylinder for extending into the clamping groove.

5. The rapid opening and closing mold oil press according to any one of claims 1 to 3, characterized by: The displacement sensor is arranged vertically on the top plate, and its measuring end is connected with the movable die plate and penetrates through the top plate.

6. The rapid opening and closing mold oil press according to any one of claims 1 to 3, characterized by: An equalizing valve is arranged on the hydraulic oil circuit of the hydraulic system.

Images