A direct-drive electric press that greatly improves production efficiency

Abstract

The present application discloses a direct-drive electric press that greatly improves production efficiency, including a frame, a top platform is provided on the top of the frame, a pressure motor is provided on the top platform, the pressure motor includes a rotor and a stator, the diameter of the rotor of the pressure motor is greater than the set diameter, and the rotor is fixedly connected to the flywheel. The rotating shaft of the rotor includes a main body section, the outer side of the main body section is sleeved with the rotor, and the main body section is a straight cylindrical structure; the upper end of the main body section is provided with an upper shaft end, and the upper shaft end is rotatably connected to the housing of the pressure motor; the lower end of the main body section is provided with a transition section, and the transition section is a straight cylindrical structure, and the diameter of the transition section is greater than the diameter of the main body section. The beneficial effects of this scheme can be known from the description of the above scheme, that is, the structure is simple, the design is reasonable, the rotating chain of the press is reduced, thereby reducing energy loss; the starting torque is large, and the performance of the press is improved; at the same time, in order to adapt to the above changes, the pressure-receiving part of the screw is designed to be arc-shaped and smooth contact, thereby reducing stress concentration.

Description

Technical Field

[0001] The invention relates to the field of machining, and in particular to a direct-drive electric press capable of greatly improving production efficiency. Background Art

[0002] The screw press is a metal die forging equipment with a long history. According to the driving form, it can be divided into friction press, hydraulic screw press and clutch screw press. Each of these presses has its own advantages and disadvantages: the friction press has a simple structure and a long history, but the transmission efficiency is low and the energy consumption is high; the hydraulic screw press has a large hydraulic system and a high failure rate; the clutch screw press developed in the 1980s combines the advantages of hydraulic presses, hammers, hot die forging presses, etc., and has made great breakthroughs. It is commonly known as a high-energy press, but this press has a complex structure. It has both the clutch part of the hot die forging press and the pump station of the hydraulic press, and it is also quite difficult to control. The advent of the electric press originated in Germany. At present, there are direct drive and primary mechanical transmission types, which are recognized by the society as the most economical, shortest transmission chain, high efficiency and energy-saving forging equipment. In particular, the direct drive electric screw press is directly driven by the motor, and its rotor is part of the flywheel, and its advantages are extremely prominent. Therefore, it has attracted attention from all walks of life. However, the structure, installation method, power factor, etc. of this commonly used motor are the same as those of asynchronous motors, and cannot meet the application. Summary of the invention

[0003] The present invention aims at the deficiencies in the prior art and provides a direct-drive electric press with a simple structure, reasonable design, reduced rotating chain of the press, thereby reducing energy loss; large starting torque, improved performance of the press; at the same time, in order to adapt to the above changes, the pressure-receiving part of the screw is designed to have an arc-shaped smooth contact, thereby reducing stress concentration and greatly improving production efficiency.

[0004] In order to achieve the above-mentioned object, the present invention provides a direct-drive electric press machine that greatly improves production efficiency, comprising a frame, a top platform is arranged on the top of the frame, a crossbeam is connected to the top platform, a column is connected to the lower side of the crossbeam, and a lower mold base is connected to the lower end of the column;

[0005] The top platform is provided with a pressure motor, the pressure motor is transmission-connected with a flywheel, the flywheel is transmission-connected with a screw, the screw is movably connected with a slider, and the slider slides up and down along the column;

[0006] The pressure motor adopts a switched reluctance motor, and the pressure motor includes a rotor and a stator. The diameter of the rotor of the pressure motor is larger than a set diameter, and the rotor is fixedly connected to the flywheel.

[0007] Furthermore, the rotating shaft of the rotor includes a body section, the outer side of the body section is sleeved with the rotor, and the body section is a straight cylindrical structure;

[0008] An upper shaft end is provided at the upper end of the body section, and the upper shaft end is rotatably connected to the pressure motor housing;

[0009] A transition section is arranged at the lower end of the main body section. The transition section is a straight cylindrical structure, and the diameter of the transition section is larger than the diameter of the main body section.

[0010] Furthermore, the flywheel and the rotor are connected by radial buckles and fixed as a whole by axial bolts.

[0011] Furthermore, a flange edge is provided at the lower end of the transition section;

[0012] The flywheel is provided with a matching groove which is buckled with the flange edge, and bolts are evenly distributed on the flange edge and the flywheel.

[0013] Furthermore, an axial round pin is provided between the screw and the flywheel to transmit torque;

[0014] The upper end of the round pin is provided with a gland surrounding the screw rod, and a gasket is provided between the gland and the round pin;

[0015] A round nut fixedly connected to the upper end of the screw rod is arranged on the upper side of the gland;

[0016] A pressing sleeve surrounding the round nut is arranged on the upper side of the pressing cover, and the pressing sleeve and the pressing cover are connected with the flywheel bolts.

[0017] Furthermore, the crossbeam, the column and the lower mold base are connected with tie rods, and four tie rods are provided.

[0018] Furthermore, the threaded teeth at the lower end of the screw rod are movably connected with a screw sleeve, and the screw sleeve is fixedly connected to the slider;

[0019] The outer side surface of the screw sleeve is arranged in a plurality of stepped sections, and the diameter of each step increases from bottom to top;

[0020] The slider matches the shape of the screw sleeve;

[0021] An axial round pin is arranged between the sliding block and the screw sleeve.

[0022] Furthermore, an annular boss is provided in the middle of the screw, and the crossbeam is provided with a limiting structure of the boss;

[0023] The two sides of the boss are in arc-shaped transition with the surface of the screw, and the limiting structure is slidably connected with the arc surface on the upper side of the boss.

[0024] Furthermore, the limiting structure includes an annular groove provided on the crossbeam, and the annular groove surrounds the screw rod;

[0025] Limit blocks are evenly arranged in the annular groove, and the limit blocks are connected to the crossbeam bolts;

[0026] The annular groove is provided with a support ring surrounding the screw, and the support ring cooperates with the limit block to form a limit groove;

[0027] An anti-friction washer is connected to the lower surface of the support ring.

[0028] Furthermore, the anti-friction washer is arranged around the screw rod, the anti-friction washer is provided with a groove, and a limiting pin is provided in the groove.

[0029] When working, the rotor diameter of the motor is relatively large, and it can be directly connected to the flywheel of the press to drive it directly, that is, when the motor is powered on, the rotor rotates with the flywheel, and the press works, reducing the energy loss of the transmission parts to a minimum. The experiment proves that it has high reliability and significant power saving effect. Compared with the friction press, the power saving is 76% by hitting the test pad eight times per minute. The starting torque is large. The switched reluctance motor itself has the characteristics of low-speed and high-torque starting, but the maximum torque used in general machinery is 1-2 times the rated value, while this technology reaches more than 3 times, ensuring the normal use of the screw press under such working conditions.

[0030] The calculation of the moment of inertia of the flywheel is integrated with the rotor of the motor to meet the requirements of maximum striking force and striking energy. The connection between the flywheel and the screw adopts circumferentially evenly distributed cylindrical pins to achieve the accuracy of the rotor angle when the motor rotates forward and reverse, and realize the effective control of the motor and striking energy.

[0031] The screw, nut and frame are the main load-bearing parts of the press, and are generally required to withstand impact loads of 2 to 2.5 times the nominal force. The frame adopts a 4-tie rod prestressed structure to form a closed frame with strong load-bearing capacity. The nut is installed in the slider and adopts an equal strength design. The middle part of the screw is designed as a boss. In addition to the main force of the thread teeth, the boss is the main force point. It is connected to the frame with a spherical movable connection. The material is copper alloy, which can automatically adjust and overcome friction resistance, so as to achieve both load-bearing and relative rotation with the screw.

[0032] The beneficial effects of this scheme can be known from the description of the above scheme. It has a simple structure, reasonable design, reduces the rotating chain of the press, thereby reducing energy loss; the starting torque is large, which improves the performance of the press; at the same time, in order to adapt to the above changes, the pressure-receiving part of the screw is designed to be an arc-shaped smooth contact, thereby reducing stress concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1It is a structural schematic diagram of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the connection relationship between the flywheel and the pressure motor of the present invention;

[0035] Figure 3 This is a structural schematic diagram of the connection relationship between the screw, flywheel and pressure motor of the present invention;

[0036] Figure 4 It is a structural schematic diagram of the limiting structure of the present invention;

[0037] In the figure, 1, frame; 2, top platform; 3, crossbeam; 4, column; 5, lower mold base; 6, pressure motor; 7, flywheel; 8, screw; 9, slider; 10, rotor; 11, stator; 12, rotating shaft; 13, main body section; 14, upper shaft end; 15, transition section; 16, flange edge; 17, pressure cover; 18, gasket; 19, round nut; 20, pressure sleeve; 21, pull rod; 22, screw sleeve; 23, boss; 24, limiting structure; 25, limiting block; 26, support ring; 27, anti-friction gasket; 28, groove; 29, limiting pin. DETAILED DESCRIPTION

[0038] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0039] like Figure 1-4 As shown, this embodiment is a direct-drive electric press machine that greatly improves production efficiency, including a frame 1, a top platform 2 is arranged on the top of the frame 1, the top platform 2 is connected to a crossbeam 3, a column 4 is connected to the lower side of the crossbeam 3, and a lower mold base 5 is connected to the lower end of the column 4;

[0040] The top platform 2 is provided with a pressure motor 6, the pressure motor 6 is transmission-connected with a flywheel 7, the flywheel 7 is transmission-connected with a screw 8, the screw 8 is movably connected with a slider 9, and the slider 9 slides up and down along the column 4;

[0041] The pressure motor 6 adopts a switched reluctance motor. The pressure motor 6 includes a rotor 10 and a stator 11 . The diameter of the rotor 10 of the pressure motor 6 is larger than the set diameter. The rotor 10 is fixedly connected to the flywheel 7 .

[0042] The rotating shaft 12 of the rotor 10 includes a body section 13, the outer side of the body section 13 is sleeved with the rotor 10, and the body section 13 is a straight cylindrical structure;

[0043] An upper shaft end 14 is provided at the upper end of the body section 13, and the upper shaft end 14 is rotatably connected to the housing of the pressure motor 6;

[0044] A transition section 15 is disposed at the lower end of the main body section 13 . The transition section 15 is a straight cylindrical structure, and the diameter of the transition section 15 is greater than the diameter of the main body section 13 .

[0045] The flywheel 7 and the rotor 10 are connected by radial buckles and fixed as a whole by axial bolts.

[0046] A flange 16 is provided at the lower end of the transition section 15;

[0047] The flywheel 7 is provided with a matching groove which is engaged with the flange edge 16 , and bolts are evenly distributed on the flange edge 16 and the flywheel 7 .

[0048] An axial round pin is provided between the screw 8 and the flywheel 7 to transmit torque;

[0049] A gland 17 surrounding the screw 8 is provided at the upper end of the round pin, and a gasket 18 is provided between the gland 17 and the round pin;

[0050] A round nut 19 fixedly connected to the upper end of the screw rod 8 is provided on the upper side of the gland 17;

[0051] A pressing sleeve 20 surrounding the round nut 19 is arranged on the upper side of the pressure cover 17 , and the pressure sleeve 20 , the pressure cover 17 and the flywheel 7 are bolted together.

[0052] Tie rods 21 are provided through the cross beam 3 , the column 4 and the lower mold base 5 , and four tie rods 21 are provided.

[0053] The threaded sleeve 22 is movably connected to the lower end of the screw rod 8, and the screw sleeve 22 is fixedly connected to the slider 9;

[0054] The outer side surface of the screw sleeve 22 is arranged in a stepped manner with the diameter of each step increasing from bottom to top;

[0055] The slider 9 matches the shape of the screw sleeve 22;

[0056] An axial round pin is arranged between the slider 9 and the screw sleeve 22 .

[0057] An annular boss 23 is provided in the middle of the screw rod 8, and a limiting structure 24 of the boss 23 is provided on the cross beam 3;

[0058] The two sides of the boss 23 transition to the surface of the screw rod 8 in an arc shape, and the limiting structure 24 is slidably connected to the arc surface on the upper side of the boss 23 .

[0059] The limiting structure 24 includes an annular groove provided on the cross beam 3, and the annular groove surrounds the screw 8;

[0060] Limit blocks 25 are evenly arranged in the annular groove, and the limit blocks 25 are bolted to the cross beam 3;

[0061] The annular groove is provided with a support ring 26 surrounding the screw 8, and the support ring 26 cooperates with the limit block 25 to form a limit groove;

[0062] An anti-friction washer 27 is connected to the lower surface of the support ring 26 .

[0063] The anti-friction washer 27 is disposed around the screw rod 8 . The anti-friction washer 27 is provided with a groove 28 . A limit pin 29 is disposed in the groove 28 .

[0064] When working, the rotor diameter of the motor is relatively large, and it can be directly connected to the flywheel of the press to drive it directly, that is, when the motor is powered on, the rotor rotates with the flywheel, and the press works, reducing the energy loss of the transmission parts to a minimum. The experiment proves that it has high reliability and significant power saving effect. Compared with the friction press, the power saving is 76% by hitting the test pad eight times per minute. The starting torque is large. The switched reluctance motor itself has the characteristics of low-speed and high-torque starting, but the maximum torque used in general machinery is 1 to 2 times the rated value, while this technology reaches more than 3 times, ensuring the normal use of the screw press under such working conditions.

[0065] The calculation of the moment of inertia of the flywheel is integrated with the rotor of the motor to meet the requirements of maximum striking force and striking energy. The connection between the flywheel and the screw adopts circumferentially evenly distributed cylindrical pins to achieve the accuracy of the rotor angle when the motor rotates forward and reverse, and realize the effective control of the motor and striking energy.

[0066] The screw, nut and frame are the main load-bearing parts of the press, and are generally required to withstand impact loads of 2 to 2.5 times the nominal force. The frame adopts a 4-tie rod prestressed structure to form a closed frame with strong load-bearing capacity. The nut is installed in the slider and adopts an equal strength design. The middle part of the screw is designed as a boss. In addition to the main force of the thread teeth, the boss is the main force point. It is connected to the frame with a spherical movable connection. The material is copper alloy, which can automatically adjust and overcome friction resistance, so as to achieve both load-bearing and relative rotation with the screw.

[0067] Technical features not described in the present invention can be achieved through or by adopting existing technologies and will not be described in detail herein. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A direct-drive electric press machine that greatly improves production efficiency, characterized in that: It comprises a frame, wherein a top platform is arranged on the top of the frame, the top platform is connected with a crossbeam, a column is connected to the lower side of the crossbeam, and a lower mold base is connected to the lower end of the column; The top platform is provided with a pressure motor, the pressure motor is transmission-connected with a flywheel, the flywheel is transmission-connected with a screw, the screw is movably connected with a slider, and the slider slides up and down along the column; The pressure motor adopts a switched reluctance motor, and the pressure motor comprises a rotor and a stator, and the rotor is fixedly connected to the flywheel; The middle part of the screw rod is provided with an annular boss, and the cross beam is provided with a limiting structure of the boss; The two sides of the boss transition to the surface of the screw in an arc shape, and the limiting structure is slidably connected to the arc surface on the upper side of the boss; The limiting structure includes an annular groove provided on the crossbeam, and the annular groove surrounds the screw rod; Limit blocks are evenly arranged in the annular groove, and the limit blocks are connected to the crossbeam bolts; The annular groove is provided with a support ring surrounding the screw, and the support ring cooperates with the limit block to form a limit groove; An anti-friction washer is connected to the lower surface of the support ring; The anti-friction washer is arranged around the screw rod, the anti-friction washer is provided with a groove, and a limit pin is arranged in the groove; An axial round pin is provided between the screw and the flywheel to transmit torque; The upper end of the round pin is provided with a gland surrounding the screw rod, and a gasket is provided between the gland and the round pin; A round nut fixedly connected to the upper end of the screw rod is arranged on the upper side of the gland; A pressing sleeve surrounding the round nut is arranged on the upper side of the pressing cover, and the pressing sleeve and the pressing cover are connected with the flywheel bolts.

2. A direct-drive electric press machine with greatly improved production efficiency according to claim 1, characterized in that: The rotating shaft of the rotor comprises a body section, the outer side of the body section is sleeved with the rotor, and the body section is a straight cylindrical structure; An upper shaft end is provided at the upper end of the body section, and the upper shaft end is rotatably connected to the pressure motor housing; A transition section is provided at the lower end of the main body section, the transition section is a straight cylindrical structure, and the diameter of the transition section is larger than the diameter of the main body section; The flywheel and the rotor are connected by radial buckles and fixed as a whole by axial bolts; A flange is provided at the lower end of the transition section; The flywheel is provided with a matching groove which is buckled with the flange edge, and bolts are evenly distributed on the flange edge and the flywheel.

3. A direct-drive electric press with greatly improved production efficiency according to claim 1, characterized in that: The crossbeam, the column and the lower mold base are connected with pull rods, and four pull rods are provided.

4. A direct-drive electric press machine with greatly improved production efficiency according to claim 1, characterized in that: The threaded teeth at the lower end of the screw rod are movably connected with a screw sleeve, and the screw sleeve is fixedly connected to the slider; The outer side surface of the screw sleeve is arranged in a plurality of stepped sections, and the diameter of each step increases from bottom to top; The slider matches the shape of the screw sleeve; An axial round pin is arranged between the sliding block and the screw sleeve.

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