Vacuum electric screw press

Abstract

The invention belongs to the technical field of press devices, and particularly relates to a vacuum electric screw press which comprises a rack, a sliding block, a driving device and a workbench are arranged on the rack in a matched mode, the driving device comprises a switch reluctance speed regulating motor, a flywheel and a screw, the flywheel is fixedly connected with the screw, the sliding block comprises a main sliding block, and a transmission nut is arranged in the main sliding block. An auxiliary sliding block is arranged below the main sliding block in a matched mode, a vacuum sealing device is arranged between the auxiliary sliding block and the workbench and comprises a sealing cavity, an upper sealing cover and a lower sealing cover, the upper sealing cover is located between the sealing cavity and the lower sealing cover, a fixing groove is formed in the upper sealing cover, and an air exhaust hole is formed in the lower sealing cover; according to the automatic pressure relief device, residual air in the die cavity can be eliminated, and the safety risk caused by insufficient pressure relief is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of press devices, and particularly relates to a vacuum electric screw press. Background Art

[0002] In high-temperature industrial fields such as metallurgy, building materials, and aerospace, refractory products such as standard bricks, shaped bricks, and slide bricks need to have the characteristics of high density, low porosity, and high strength due to being subjected to temperatures above 1500°C. Electric screw presses have become the mainstream forming equipment for the above-mentioned refractory materials due to their advantages of high-efficiency striking ability and controllable energy. However, during the pressing process of an electric screw press, air is likely to remain in the mold cavity, resulting in an excessive porosity and a reduced compressive strength of the refractory product. At the same time, uneven air distribution will cause uneven pressure conduction, leading to uneven forming of the refractory product. In addition, the expansion of the residual gas during the compression process is likely to cause problems such as delamination or surface cracking of the billet.

[0003] Chinese Patent CN113492548A discloses a high-density carbon anode forming device, including a screw press. The screw press includes a frame, a screw, a nut, a driving motor, a base, and an upper slider. A lower slider is provided below the upper slider. The forming device further includes a shuttle die-changing mechanism. The shuttle die-changing mechanism includes a support seat fixedly installed on the base. A shuttle car that can slide left and right is provided on the support seat. There are no less than two die cavity blocks that can move up and down on the shuttle car. A die cavity is provided on the die cavity block, and a lower die is provided in the die cavity. A double-sided pressing device is provided between both sides of each die cavity block and the shuttle car. A vacuum pumping unit communicating with the die cavity is provided on one side of the support seat. This patent uses a screw press to stamp and form a carbon anode, and combines vacuum pumping and double-sided pressing to ensure close contact between material particles and improve the forming density. However, the rollers at both ends of the shuttle car in this patent are in long-term contact and rolling with the guide rail, which will cause wear on the surfaces of the rollers and the guide rail. As the wear intensifies, the clearance between the roller and the guide rail will gradually increase. When the shuttle car is driven by the driving device, this clearance will cause positioning errors of the shuttle car, resulting in inaccurate alignment between the die cavity on the die cavity block and the lower seal of the die, leading to a decrease in the vacuum sealing effect and air leakage during vacuum pumping. At the same time, this patent needs to move the die cavity out of the screw press by the shuttle car to unload bricks. If the die cavity is not fully depressurized, the risk of operators directly contacting the high-pressure die increases, posing a safety hazard. Summary of the Invention

[0004] The purpose of the present invention is to provide a vacuum electric screw press, which can eliminate the residual air inside the die cavity, maintain the vacuum sealing effect of the die cavity, avoid air leakage from affecting the vacuum pumping efficiency, and at the same time avoid operators from contacting the high-pressure die and avoid safety risks caused by insufficient depressurization.

[0005] To achieve the above purpose, the technical solution of the present invention is as follows: The vacuum electric screw press of the present invention includes a frame, on which a slider, a driving device and a workbench are cooperatively arranged. The driving device includes a switched reluctance speed regulating motor, a flywheel and a screw. The flywheel is fixedly connected to the screw. The slider includes a main slider, and a transmission nut is arranged inside the main slider. The transmission nut meshes with the screw. A sub-slider is cooperatively arranged below the main slider, and a vacuum sealing device is arranged between the sub-slider and the workbench. The vacuum sealing device includes a sealing cavity, an upper sealing cover and a lower sealing cover. The upper sealing cover is located between the sealing cavity and the lower sealing cover. A fixing groove is arranged inside the upper sealing cover, and an air extraction hole is arranged on the lower sealing cover. A blanking device is arranged at the bottom of the frame.

[0006] Further, the frame includes an upper cross beam, a base, a left column, a right column and four tie rods. The upper cross beam is horizontally arranged, and both ends of the upper cross beam are fixedly connected to the tops of the left column and the right column respectively. The base is horizontally arranged in cooperation with the upper cross beam, and both ends of the base are fixedly connected to the bottoms of the left column and the right column respectively.

[0007] Further, the upper cross beam is provided with four mounting holes in cooperation with the four tie rods, and the base is provided with four through holes in cooperation with the four tie rods. The upper ends of the tie rods penetrate through the mounting holes and are locked by nuts, and the lower ends of the tie rods penetrate through the through holes and are locked by nuts.

[0008] Further, the left column and the right column are symmetrically arranged, and guide rails are arranged on both the left column and the right column. Both the main slider and the sub-slider are slidably arranged on the guide rails.

[0009] Further, the blanking device includes a hydraulic cylinder, a hydraulic connecting plate, an ejecting shaft and an ejecting plate. One end of the hydraulic cylinder penetrates through the base and is arranged outside the base. The bottom of the hydraulic connecting plate is connected to the hydraulic cylinder, and the top of the hydraulic connecting plate is connected to the ejecting shaft. The end of the ejecting shaft far from the hydraulic connecting plate penetrates through the workbench and is connected to the ejecting plate.

[0010] Further, two power cylinders are cooperatively arranged on the sub-slider, and four driving cylinders are cooperatively arranged on the sealing cavity.

[0011] Further, an upper die leg is fixedly arranged at the bottom of the sub-slider, a lower die leg is fixedly arranged at the top of the ejecting plate, and a die is arranged in the fixing groove. The die is located between the upper die leg and the lower die leg.

[0012] Further, a V-belt set is arranged between the switched reluctance speed regulating motor and the flywheel.

[0013] Further, a slider backing plate is arranged between the main slider and the sub-slider.

[0014] Further, a rubber ring is arranged at the top of the sealing cavity in cooperation with the sub-slider, and an O-ring is arranged between the bottom of the ejecting plate and the workbench.

[0015] The beneficial effects of the present invention are: A vacuum sealing device composed of a sealing cavity, an upper sealing cover, and a lower sealing cover, cooperating with an air extraction hole to connect to a vacuum pump, evacuates the mold cavity before pressing, thoroughly discharging the residual air in the mold cavity, solving the problems of excessive porosity and reduced compressive strength caused by air residue in traditional electric screw presses, ensuring uniform density of the product; the fixed groove inside the upper sealing cover can accurately position the mold, combined with the rubber ring at the top of the sealing cavity and the O-ring at the bottom of the ejector plate, forming a double-sealing structure to avoid air leakage during vacuum extraction and ensure the stable operation of the vacuum system.

[0016] The blanking device includes a hydraulic cylinder, a hydraulic connection plate, an ejector shaft, and an ejector plate, which can automatically eject the product after pressing, without the need to move the mold cavity outside the press, realizing in-machine brick pressing. In-machine brick pressing reduces the reciprocating movement link of the mold cavity, avoiding mechanical failures caused by mold movement due to mold cavity positioning deviation, and at the same time avoiding the risk of operators directly contacting high-pressure molds; before blanking by ejecting, the mold cavity is fully depressurized, eliminating safety hazards such as mold cracking or material splashing caused by residual pressure.

[0017] The hydraulic cylinder, hydraulic connection plate, ejector shaft, and ejector plate adopt a simple and compact mechanical connection structure, reducing potential faults, lowering the equipment manufacturing and later maintenance costs, and at the same time not requiring additional mold cavity movement space reserved like traditional out-of-machine brick pressing, reducing the floor area of the equipment; during in-machine brick pressing, the mold cavity does not need to be moved outside the screw press, eliminating the positioning calibration, mold cavity movement, centering alignment and other links required for traditional out-of-machine brick pressing, significantly improving production efficiency.

[0018] The frame adopts a closed frame structure of an upper crossbeam, a base, a left column, a right column, and four tie rods. Through the pre-tightening force of the tie rods, a rigid whole is formed to ensure that the slider, mold, and vacuum sealing device are accurately aligned during high-pressure pressing, avoiding misalignment or air leakage of the sealing surface caused by frame deformation; at the same time, the frame provides a stable reaction force basis for the blanking device to ensure a smooth ejection process and avoid affecting the brick ejection accuracy and safety due to vibration or displacement.

[0019] The present invention solves the problem of air residue in traditional electric screw presses by setting a vacuum sealing device, a blanking device, and a frame, avoiding operators from contacting high-pressure molds, and at the same time ensuring sealing accuracy and blanking stability; the present invention can effectively improve the quality of products, enhance the reliability of equipment, and ensure operation safety. Description of the Drawings

[0020] Figure 1 is a structural cross-sectional view of the present invention; Figure 2 is a partial structural cross-sectional view of the present invention removing the left column, right column, tie rods, switched reluctance speed regulating motor, mold, and vacuum sealing device; Figure 3is the top view of the present invention; Figure 4 is a partial structural schematic diagram of the present invention with the left column, switched reluctance speed regulating motor, mold, V-belt set and ejecting device removed; Figure 5 is a structural schematic diagram of the upper sealing cover and the fixing groove in the present invention; Figure 6 is a structural schematic diagram of the sealing cavity in the present invention; In the figure: 1, frame; 101, upper cross beam; 102, base; 103, left column; 104, right column; 105, tie rod; 2, slider; 201, main slider; 202, sub-slider; 3, driving device; 301, switched reluctance speed regulating motor; 302, flywheel; 303, screw; 4, transmission nut; 5, workbench; 6, vacuum sealing device; 601, sealing cavity; 602, upper sealing cover; 603, lower sealing cover; 7, ejecting device; 701, hydraulic cylinder; 702, hydraulic connection plate; 703, ejecting shaft; 704, ejecting plate; 8, upper die leg; 9, lower die leg; 10, mold; 11, V-belt set; 12, fixing groove; 13, guide rail; 14, air extraction hole. Specific embodiments

[0021] The present invention will be specifically described and illustrated below in conjunction with embodiments.

[0022] Embodiment 1 As Figures 1-6 shown, the vacuum electric screw press of the present invention includes a frame 1, on which a slider 2, a driving device 3 and a workbench 5 are cooperatively arranged. The driving device 3 includes a switched reluctance speed regulating motor 301, a flywheel 302 and a screw 303. The flywheel 302 is fixedly connected to the screw 303. The slider 2 includes a main slider 201, in which a transmission nut 4 is arranged. The transmission nut 4 meshes with the screw 303. A sub-slider 202 is cooperatively arranged below the main slider 201. A vacuum sealing device 6 is arranged between the sub-slider 202 and the workbench 5. The vacuum sealing device 6 includes a sealing cavity 601, an upper sealing cover 602 and a lower sealing cover 603. The upper sealing cover 602 is located between the sealing cavity 601 and the lower sealing cover 603. A fixing groove 12 is arranged inside the upper sealing cover 602. An air extraction hole 14 is arranged on the lower sealing cover 603. An ejecting device 7 is arranged at the bottom of the frame 1.

[0023] The vacuum sealing device 6 is connected to a vacuum pump through the air extraction hole 14 to evacuate the mold cavity before pressing, thoroughly discharging the residual air in the mold cavity, solving the problems of excessive porosity and reduced compressive strength caused by air residue in traditional electric screw presses, and ensuring uniform density of the product; the fixing groove 12 inside the upper sealing cover 602 can accurately position the mold 10, ensuring the accurate position of the mold 10 during pressing and improving the forming quality of the product; the ejecting device 7 can automatically eject the product after pressing without removing the mold cavity outside the press, avoiding the risk of operators directly contacting the high-pressure mold; the mold cavity is fully depressurized before ejecting the brick, eliminating potential safety hazards such as mold cracking or material splashing caused by residual pressure.

[0024] The frame 1 includes an upper crossbeam 101, a base 102, a left column 103, a right column 104 and four tie rods 105. The upper crossbeam 101 is horizontally arranged, and both ends of the upper crossbeam 101 are fixedly connected to the tops of the left column 103 and the right column 104 respectively. The base 102 is horizontally arranged in cooperation with the upper crossbeam 101, and both ends of the base 102 are fixedly connected to the bottoms of the left column 103 and the right column 104 respectively.

[0025] The upper crossbeam 101 is provided with four mounting holes in cooperation with the four tie rods 105, and the base 102 is provided with four through holes in cooperation with the four tie rods 105. The upper ends of the tie rods 105 pass through the mounting holes and are locked with nuts, and the lower ends of the tie rods 105 pass through the through holes and are locked with nuts.

[0026] The frame 1 provides rigid support for the press, ensuring that the slider 2, the mold 10 and the vacuum sealing device 6 are accurately aligned during pressing, avoiding misalignment or air leakage of the sealing surface caused by deformation of the frame 1, and providing guarantee for the stable operation of the press.

[0027] The left column 103 and the right column 104 are symmetrically arranged, and guide rails 13 are provided on both the left column 103 and the right column 104. The main slider 201 and the auxiliary slider 202 are both slidably arranged on the guide rails 13. The guide rails 13 provide guidance for the main slider 201 and the auxiliary slider 202, ensuring smooth movement of the slider 2.

[0028] The ejecting device 7 includes a hydraulic cylinder 701, a hydraulic connecting plate 702, an ejecting shaft 703 and an ejecting plate 704. One end of the hydraulic cylinder 701 passes through the base 102 and is arranged outside the base 102. The bottom of the hydraulic connecting plate 702 is connected to the hydraulic cylinder 701, the top of the hydraulic connecting plate 702 is connected to the ejecting shaft 703, and the end of the ejecting shaft 703 away from the hydraulic connecting plate 702 passes through the workbench 5 and is connected to the ejecting plate 704.

[0029] The ejector device 7 enables the press to automatically eject the product after pressing, eliminating the need for manual operation and improving production efficiency. The hydraulic connection plate 702 and the ejector shaft 703 effectively transmit the power of the hydraulic cylinder 701 to the ejector plate 704, ensuring the smooth progress of the ejection process.

[0030] Two power cylinders are arranged on the auxiliary slider 202 in a mating manner, and four drive cylinders are arranged on the sealing cavity 601 in a mating manner.

[0031] An upper die leg 8 is fixedly arranged at the bottom of the auxiliary slider 202, a lower die leg 9 is fixedly arranged at the top of the ejector plate 704, and a mold 10 is arranged in the fixing groove 12. The mold 10 is located between the upper die leg 8 and the lower die leg 9. The cooperation of the mold 10 with the upper die leg 8 and the lower die leg 9 makes the mold 10 more stable during the pressing process.

[0032] A V-belt set 11 is arranged between the switched reluctance speed regulating motor 301 and the flywheel 302. The V-belt set 11 effectively transmits the power of the switched reluctance speed regulating motor 301 to the flywheel 302, ensuring the normal operation of the press. The switched reluctance speed regulating motor 301 can be steplessly adjusted, and the impact force can be accurately controlled according to the forming requirements of different refractory materials, avoiding delamination or surface cracking of the billet caused by over-pressing.

[0033] A slider backing plate is arranged between the main slider 201 and the auxiliary slider 202. The slider backing plate can play a role in buffering and shock absorption between the main slider 201 and the auxiliary slider 202, improving the working stability.

[0034] A rubber ring is arranged at the top of the sealing cavity 601 in cooperation with the auxiliary slider 202, and an O-ring is arranged between the bottom of the ejector plate 704 and the workbench 5. The rubber ring and the O-ring further enhance the sealing performance of the vacuum sealing device 6, avoiding air leakage during vacuum pumping.

[0035] Working process and principle: I. Initialization preparation Start the power cylinder, and the two power cylinders on the auxiliary slider 202 push the auxiliary slider 202 to move downward along the guide rail 13 to the specified position.

[0036] The upper die leg 8 at the bottom of the auxiliary slider 202 cooperates with the lower die leg 9 at the top of the ejector plate 704 to accurately position the mold 10 in the fixing groove 12 inside the upper sealing cover 602, forming a mold cavity.

[0037] II. Vacuum sealing and vacuum pumping Start the drive cylinder, and the four drive cylinders on the sealing cavity 601 drive the sealing cavity 601 to move downward to close with the upper sealing cover 602. At the same time, the rubber ring at the top of the sealing cavity 601 and the O-ring at the bottom of the ejector plate 704 form a double-sealing structure to seal the mold cavity.

[0038] Start the vacuum pump and evacuate the mold cavity through the air extraction hole 14 on the lower sealing cover 603 until the pressure value reaches 0.07 MPa to ensure that the residual air in the mold cavity is completely discharged.

[0039] III. Impact Molding The switched reluctance motor 301 drives the flywheel 302 to rotate through the V-belt set 11. The flywheel 302 drives the screw 303 to rotate forward and backward frequently. The screw 303 meshes with the transmission nut 4 inside the main slider 201 to drive the main slider 201 to move along the guide rail 13.

[0040] The main slider 201 moves downward to strike the sub-slider 202, and the sub-slider 202 moves downward to strike the blank in the mold 10 to form a refractory product.

[0041] IV. Pressure Relief and Reset After the impact is completed, the vacuum pump stops working, and the pressure in the mold cavity is released through the air extraction hole 14.

[0042] The drive oil cylinder of the sealing cavity 601 drives the sealing cavity 601 to reset, and the sub-slider 202 returns to the initial position under the action of the power oil cylinder.

[0043] V. Automatic Brick Ejection Inside the Machine Start the blank ejection device 7. The hydraulic cylinder 701 pushes the ejection plate 704 upward through the ejection shaft 703 to eject the refractory product from the mold 10.

[0044] After the refractory product is taken out, the hydraulic cylinder 701 resets and the ejection plate 704 falls back.

Claims

1. A vacuum electric screw press, comprising a frame (1), a slider (2), a drive device (3) and a workbench (5) being arranged on the frame (1), the drive device (3) comprising a switched reluctance speed regulating motor (301), a flywheel (302) and a screw (303), the flywheel (302) being fixedly connected to the screw (303), characterized in that: The slider (2) comprises a main slider (201), a driving nut (4) is arranged inside the main slider (201), the driving nut (4) is meshed with the screw (303), a sub-slider (202) is arranged below the main slider (201), a vacuum sealing device (6) is arranged between the sub-slider (202) and the workbench (5), the vacuum sealing device (6) comprises a sealing chamber (601), an upper sealing cover (602) and a lower sealing cover (603), the upper sealing cover (602) is located between the sealing chamber (601) and the lower sealing cover (603), a fixing groove (12) is arranged inside the upper sealing cover (602), an air extraction hole (14) is arranged on the lower sealing cover (603), and a material ejecting device (7) is arranged at the bottom of the frame (1).

2. The vacuum electric screw press according to claim 1, characterized in that: The frame (1) comprises an upper crossbeam (101), a base (102), a left column (103), a right column (104) and four tie rods (105); the upper crossbeam (101) is arranged horizontally and two ends of the upper crossbeam (101) are respectively fixedly connected to the top ends of the left column (103) and the right column (104); the base (102) is arranged horizontally in coordination with the upper crossbeam (101) and two ends of the base (102) are respectively fixedly connected to the bottom ends of the left column (103) and the right column (104).

3. The vacuum electric screw press according to claim 2, characterized in that: The upper crossbeam (101) is provided with four mounting holes in cooperation with the four pull rods (105), and the base (102) is provided with four through holes in cooperation with the four pull rods (105). The upper ends of the pull rods (105) pass through the mounting holes and are locked by nuts, and the lower ends of the pull rods (105) pass through the through holes and are locked by nuts.

4. The vacuum electric screw press according to claim 2, characterized in that: The left column (103) and the right column (104) are symmetrically arranged and both the left column (103) and the right column (104) are provided with guide rails (13), and the main slider (201) and the auxiliary slider (202) are both slidably arranged on the guide rails (13).

5. The vacuum electric screw press according to claim 2, characterized in that: The ejector device (7) comprises a hydraulic cylinder (701), a hydraulic connecting plate (702), an ejector shaft (703) and an ejector plate (704); one end of the hydraulic cylinder (701) passes through the base (102) and is arranged outside the base (102); the bottom of the hydraulic connecting plate (702) is connected to the hydraulic cylinder (701); the top of the hydraulic connecting plate (702) is connected to the ejector shaft (703); and one end of the ejector shaft (703) away from the hydraulic connecting plate (702) passes through the workbench (5) and is connected to the ejector plate (704).

6. The vacuum electric screw press according to claim 1, characterized in that: Two power cylinders are arranged on the auxiliary sliding block (202), and four driving cylinders are arranged on the sealing chamber (601).

7. The vacuum electric screw press according to claim 5, characterized in that: An upper mold leg (8) is fixedly arranged at the bottom of the auxiliary slide block (202), a lower mold leg (9) is fixedly arranged at the top of the ejection plate (704), a mold (10) is arranged in the fixed groove (12), and the mold (10) is located between the upper mold leg (8) and the lower mold leg (9).

8. The vacuum electric screw press according to claim 1, characterized in that: A combined V-belt (11) is provided between the switched reluctance speed regulating motor (301) and the flywheel (302).

9. The vacuum electric screw press according to claim 1, characterized in that: A slider pad is provided between the main slider (201) and the auxiliary slider (202).

10. The vacuum electric screw press according to claim 5, characterized in that: A rubber ring is provided at the top of the sealing cavity (601) to cooperate with the auxiliary sliding block (202), and an O-ring is provided between the bottom of the ejection plate (704) and the workbench (5).

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