Motors used in electric screw presses for forging

Abstract

This invention relates to the field of motor technology, and in particular provides a motor for an electric screw press used in forging. One end of the motor shaft is fixed by a first bearing and a second bearing, and the motor shaft drives the electric screw press to rotate via gears. A bracket is fixedly connected to one end of the motor housing, and a rotor chassis is detachably connected to the other end of the motor shaft. The motor rotor is fixed to the rotor chassis by bolts. A third bearing is installed between the rotor chassis and the bracket. This motor, with its motor housing designed with a fixed bracket, can stably mount the motor shaft and motor rotor, thus ensuring normal motor operation. Furthermore, the bolted connection between the rotor chassis and the motor rotor allows the motor rotor to be firmly fixed to the bracket, thereby reducing noise and vibration during operation. The installation of the third bearing between the rotor chassis and the bracket improves the stability of motor operation, reduces motor failures, increases service life, and improves work efficiency.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and more particularly to an electric motor for a forging electric screw press, used to provide a power source for the electric screw press. Background Technology

[0002] The electric motor is the power source that drives the equipment. Currently, forging electric screw presses require two large motors for operation. Traditional motors typically operate through the magnetic field between the rotor and stator. However, this structure has some problems. For example, during motor rotation, friction between the bearings and the rotor can lead to bearing wear and rotor runout. The electric motor structure of the electric screw press is quite unique. Due to the heavy load and frequent operation of the electric screw press, the large motor is prone to instability and failures, reducing its lifespan and impacting the work process, thus lowering efficiency. Summary of the Invention

[0003] In view of this, the present invention provides a motor for an electric screw press for forging, which improves the stability of motor operation, reduces motor failures, increases service life, and improves work efficiency.

[0004] In a first aspect, the present invention provides a motor for a forging electric screw press, comprising: a motor housing, wherein a motor shaft, a motor rotor, and a motor stator are disposed within the motor housing; one end of the motor shaft is fixed by a first bearing and a second bearing, the first bearing and the second bearing being respectively disposed on both sides of a gear, and the motor shaft driving the electric screw press to rotate via the gear; a bracket is fixedly connected to one end of the motor housing, and a rotor chassis is detachably connected to the other end of the motor shaft, the rotor chassis and the motor shaft being fixedly connected; the first bearing and the second bearing are respectively disposed at both ends of the motor, wherein the motor rotor is disposed at the end closer to the rotor chassis; the motor stator is disposed on the outside of the motor rotor; the motor rotor is fixed to the rotor chassis by bolts; and a third bearing is installed between the rotor chassis and the bracket.

[0005] Optionally, the rotor chassis is provided with bolt holes, pin holes, and bearing retaining rings, the bearing retaining rings being used to fix the inner ring of the bearing; one end of the rotor chassis extending toward the third bearing is connected to a bearing lower pressure sleeve via threads, the inner hole of the bearing lower pressure sleeve being threaded.

[0006] Optionally, an oil seal pressure plate and an oil seal are installed at one end of the bracket; the inner diameter of the oil seal is tightly fitted to the outer side of the lower bearing sleeve, and the oil seal plays a sealing role.

[0007] Optionally, the motor shaft has a central hole and multiple pins at one end near the rotor chassis. The front end of the rotor chassis mates with the central hole of the motor shaft, and the motor rotor is fixed by bolts and pins.

[0008] Optionally, the third bearing has a bearing pressure plate at one end extending toward the rotor chassis, the bearing pressure plate being used to fix the outer ring of the bearing; the bearing pressure plate is fixedly connected by bolts and brackets.

[0009] Optionally, the bearing pressure plate is provided with a grease nipple, through which the grease flows to the lubrication groove and then into the third bearing roller; the lubrication groove is located directly opposite the third bearing roller.

[0010] Optionally, the bracket is provided with an air inlet.

[0011] Optionally, the bracket is made of cast aluminum alloy.

[0012] Optionally, the third bearing is a NU type cylindrical roller bearing.

[0013] The technical solution for a motor used in an electric screw press for forging provided by this invention includes a motor housing, within which a motor shaft, a motor rotor, and a motor stator are disposed. The other end of the motor shaft is fixed by a first bearing and a second bearing, which are respectively positioned on opposite sides of a gear. The motor shaft drives the electric screw press to rotate via the gear. A bracket is fixedly connected to one end of the motor housing, and a rotor chassis is detachably connected to one end of the motor shaft. The rotor chassis and the motor shaft are fixedly connected. The first and second bearings are respectively positioned at both ends of the motor, with the motor rotor positioned at the end closest to the rotor chassis. The stator is located on the outside of the motor rotor; the motor rotor is fixed to the rotor chassis by bolts; a third bearing is installed between the rotor chassis and the bracket. This motor, with its motor housing designed with a fixed bracket, can stably mount the motor shaft and rotor, thus ensuring normal motor operation. Furthermore, the bolted connection between the rotor chassis and the motor rotor firmly fixes the motor rotor to the bracket, reducing noise and vibration during operation. The installation of the third bearing between the rotor chassis and the bracket improves the stability of motor operation, reduces motor failures, increases service life, and improves work efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a structural diagram of the motor used in an electric screw press for forging, provided in an embodiment of the present invention.

[0016] Figure 2 A structural diagram of the bearing pressure plate provided in an embodiment of the present invention;

[0017] Figure 3 This is a structural diagram of the original motor provided in an embodiment of the present invention;

[0018] Figure 4 This is an internal structure diagram of the original motor provided in an embodiment of the present invention;

[0019] Figure 5 Another structural diagram of the motor for a forging electric screw press provided in an embodiment of the present invention;

[0020] Figure 6 Another structural diagram of the motor for a forging electric screw press provided in an embodiment of the present invention;

[0021] Figure 7 A structural diagram of the rotor chassis provided in an embodiment of the present invention;

[0022] Figure 8 This is a structural diagram of the bearing lower pressure sleeve provided in an embodiment of the present invention;

[0023] Figure 9 This is a structural diagram of the air inlet provided in an embodiment of the present invention.

[0024] In the diagram: 1-Motor housing, 11-Motor shaft, 111-Center hole, 12-Motor rotor, 13-Motor stator, 2-First bearing, 21-Bearing sleeve, 3-Second bearing, 4-Gear, 5-Bracket, 51-Oil seal pressure plate, 52-Oil seal, 53-Air inlet, 6-Rotor chassis, 61-Bolt hole, 62-Pin hole, 63-Bearing retaining ring, 64-Thread, 7-Third bearing, 8-Bearing lower pressure sleeve, 81-Internal thread, 9-Bolt, 10-Bearing pressure plate, 101-Oil filler nozzle. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0028] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0029] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0030] Figure 1 The structural diagram of the motor for a forging electric screw press provided in the embodiment of the present invention is as follows: Figure 1 As shown, the motor includes: a motor housing 1, a motor shaft 11, a motor rotor 12, and a motor stator 13 inside the motor housing 1. A bracket 5 is fixedly connected to one end of the motor housing 1, and a rotor chassis 6 is detachably connected to one end of the motor shaft 11. The rotor chassis 6 and the motor shaft 11 are fixedly connected. A third bearing 7 is installed between the rotor chassis 6 and the bracket 5.

[0031] In this embodiment of the invention, the third bearing 7 is a NU-type cylindrical roller bearing.

[0032] In this embodiment of the invention, one end of the rotor chassis 6 extending toward the third bearing 7 is connected to a bearing lower pressure sleeve 8 via a thread.

[0033] In this embodiment of the invention, a third bearing 3 is installed between the rotor chassis 6 and the bracket 5, which improves the stability of motor operation.

[0034] In this embodiment of the invention, an oil seal pressure plate 51 and an oil seal 52 are installed at one end of the bracket 5; the inner diameter of the oil seal 52 is tightly connected to the outside of the lower bearing sleeve 8, and the oil seal plays a sealing role. The purpose of installing the oil seal pressure plate 51 and the oil seal 52 is to seal lubricating oil and impurities.

[0035] In this embodiment of the invention, a bearing pressure plate 10 is provided at one end of the third bearing 7 extending toward the rotor chassis 6. The bearing pressure plate 10 is used to fix the outer ring of the bearing. The bearing pressure plate 10 is fixedly connected by bolts and bracket 5.

[0036] Figure 2 A structural diagram of the bearing pressure plate provided in an embodiment of the present invention is shown below. Figure 2 As shown, the bearing pressure plate 10 is provided with a grease nipple 101. The grease flows through the grease nipple 101 to the lubrication groove 102 and then flows into the roller of the third bearing 7. The lubrication groove 102 is located at the position directly opposite the roller of the third bearing 7.

[0037] In this embodiment of the invention, the grease nipple 101 enables the oil seal to perform a better sealing function, ensuring the normal operation of the motor. After grease is added to the lubrication groove manually or automatically, under the action of gravity, the grease falls into the lubrication groove directly in front of the third bearing roller, and under the action of the centrifugal force of the third bearing's operation, the grease evenly lubricates the third bearing, extending the service life of the third bearing.

[0038] In this embodiment of the invention, the press is equipped with a three-phase asynchronous motor, which converts the rotational motion of the motor into the linear motion of the slider and converts the rotational torque into the pressing force. Two three-phase asynchronous motors are used to drive the press so as to quickly switch between two working directions.

[0039] In this embodiment of the invention, a drive pinion transmits the rotational torque generated by the motor to the flywheel. The friction clutch is operated to transmit the rotational torque obtained by the flywheel to the lead screw, which then transmits the motion to the slider.

[0040] In this embodiment of the invention, an independent fan system is used to cool the motor, blowing the required cooling air into the motor from the axial direction.

[0041] Figure 3 The structural diagram of the original motor provided in the embodiment of the present invention is as follows: Figure 3 As shown, the original motor includes a motor housing 2. Inside the motor housing 1, there is a motor shaft 11, a motor rotor 12, and a motor stator 13. The motor rotor 12 is fixed by a rotor chassis 6 through bolts 9.

[0042] In this embodiment of the invention, compared with the original bolt 9 in the motor, the modified bolt 9 has been lengthened to more stably fix the motor rotor 12.

[0043] In this embodiment of the invention, the motor housing 1 with a fixed bracket 5 is designed to securely mount the motor shaft 11 and the motor rotor 12, thereby ensuring the normal operation of the motor.

[0044] In this embodiment of the invention, a detachable rotor chassis 6 is designed to facilitate the replacement of the motor shaft 11 and the motor rotor 12, thereby improving maintenance efficiency.

[0045] In this embodiment of the invention, a rotor chassis 6 and a bracket 5 are designed with bolted connections, which can securely fix the motor rotor 12 to the bracket 5, thereby reducing noise and vibration during operation.

[0046] In this embodiment of the invention, a bearing lower pressure sleeve 8 with threaded connection and an oil seal pressure plate 51 are designed to effectively seal the contact surface between the motor shaft 11 and the motor rotor 12, ensuring the normal operation of the motor.

[0047] Figure 4 The internal structure diagram of the original motor provided in the embodiments of the present invention is as follows: Figure 4 As shown, the original motor also includes a first bearing 2 and a bearing sleeve 21.

[0048] In this embodiment of the invention, a detachable first bearing 2 and a second bearing 3 are designed to facilitate bearing replacement and maintenance.

[0049] Figure 5 Another structural diagram of the motor for a forging electric screw press provided in an embodiment of the present invention is shown below. Figure 5 As shown, the other end of the motor shaft 11 is fixed by the first bearing 2 and the second bearing 3. The first bearing 2 and the second bearing 3 are respectively located on both sides of the gear 4. The motor shaft 11 drives the electric screw press to rotate through the gear 4.

[0050] In this embodiment of the invention, the motor shaft 11 is provided with a central hole and a plurality of pins at one end near the rotor chassis 6. The front end of the rotor chassis 6 is engaged with the central hole 111 of the motor shaft 11, and the motor rotor 12 is fixed by bolts 9 and pins.

[0051] In this embodiment of the invention, a motor shaft with multiple pins and a central hole 111 is designed, which enables a tighter fit between the motor rotor 12 and the bracket 5, thereby improving the operating stability of the motor.

[0052] Figure 6 Another structural diagram of the motor for a forging electric screw press provided in an embodiment of the present invention is shown below. Figure 6 As shown, the first bearing 2 and the second bearing 3 are respectively disposed at both ends of the motor and the motor rotor 12, wherein the motor rotor 12 is disposed at one end close to the rotor chassis 6; the motor stator 13 is disposed on the outside of the motor rotor 12; the motor rotor 12 is fixed to the rotor chassis 6 by bolts 9.

[0053] In this embodiment of the invention, integral vacuum pressure impregnation is employed. The motor's technical specifications include a rated voltage of 640V, a rated capacity of 1125KW, a rated frequency of 50HZ, a rated current of 1250A, a rated speed of 5801 / min, and a rated power factor of COS. n=1, the motor's enclosure protection rating is IP23, the insulation class is F155℃, and the duty cycle is S4-100%; the noise and vibration requirements comply with the relevant provisions of the national standard (GB755); the motor stator windings and insulation materials all adopt F-class insulation.

[0054] The locked-rotor current of the motor should be determined through a thorough techno-economic comparison to ensure the design has the lowest possible value. Unless otherwise specified, under rated voltage, the guaranteed ratio of the locked-rotor current to the rated current should be less than or equal to 6 times. Under rated voltage, the guaranteed ratio of the maximum torque to the rated torque should be 1.6 times. The locked-rotor torque of the motor should conform to the relevant motor standards. After repair, the motor bearing housing should meet the factory design standards.

[0055] At rated power, voltage, and frequency, the guaranteed power factor is above 0.8; the guaranteed frequency is above 90%. The motor can continuously perform the following starts: 3 cold starts; 2 hot starts. Under rated voltage, the guaranteed minimum torque during motor starting should not be less than 0.5 times the guaranteed stall torque. The epoxy slot wedges on the motor stator must not fall off during operation.

[0056] Figure 7 A structural diagram of the rotor chassis provided in an embodiment of the present invention is shown below. Figure 7 As shown, the rotor chassis 6 is provided with bolt holes 61, pin holes 62, and bearing retaining rings 63. The bearing retaining rings 63 are used to fix the inner ring of the bearing.

[0057] Figure 8 A structural diagram of the bearing lower pressure sleeve provided in an embodiment of the present invention is shown below. Figure 8 As shown, the inner hole of the bearing lower pressure sleeve 8 is threaded.

[0058] Figure 9 A structural diagram of the air inlet provided in an embodiment of the present invention, as shown below. Figure 9 As shown, the bracket 5 is equipped with an air inlet 53.

[0059] In this embodiment of the invention, the support 5 is made of cast aluminum alloy, with the aim of lightweight design while ensuring strength.

[0060] In this embodiment of the invention, the motor is suitable for the harsh environment under forging conditions and conforms to VDE (German Association for Electrical, Electronic & Information Technologies) standards.

[0061] In this embodiment of the invention, in order to prevent thermal overload, a temperature monitoring device is used to protect the motor, wherein the temperature monitoring device consists of a thermocouple and a value relay.

[0062] The technical solution for a motor used in an electric screw press for forging provided by this invention includes a motor housing, within which a motor shaft, a motor rotor, and a motor stator are disposed. The other end of the motor shaft is fixed by a first bearing and a second bearing, which are respectively positioned on opposite sides of a gear. The motor shaft drives the electric screw press to rotate via the gear. A bracket is fixedly connected to one end of the motor housing, and a rotor chassis is detachably connected to one end of the motor shaft. The rotor chassis and the motor shaft are fixedly connected. The first and second bearings are respectively positioned at both ends of the motor, with the motor rotor positioned at the end closest to the rotor chassis. The stator is located on the outside of the motor rotor; the motor rotor is fixed to the rotor chassis by bolts; a third bearing is installed between the rotor chassis and the bracket. This motor, with its motor housing designed with a fixed bracket, can stably mount the motor shaft and rotor, thus ensuring normal motor operation. Furthermore, the bolted connection between the rotor chassis and the motor rotor firmly fixes the motor rotor to the bracket, reducing noise and vibration during operation. The installation of the third bearing between the rotor chassis and the bracket improves the stability of motor operation, reduces motor failures, increases service life, and improves work efficiency.

[0063] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A motor for a forging electric screw press, comprising: A motor housing (1) is provided with a motor shaft (11), a motor rotor (12), and a motor stator (13). The motor shaft (11) is characterized in that one end is fixed by a first bearing (2) and a second bearing (3), which are respectively positioned on opposite sides of a gear (4). The motor shaft (11) drives an electric screw press to rotate via the gear (4). A bracket (5) is fixedly connected to one end of the motor housing (1), and a detachable bracket (5) is connected to the other end of the motor shaft (11). The rotor chassis (6) and the motor shaft (11) are fixedly connected; the first bearing (2) and the second bearing (3) are located at one end of the motor, and the motor rotor (12) is located at the other end of the motor, wherein the motor rotor (12) is located at the end close to the rotor chassis (6); the motor stator (13) is located on the outside of the motor rotor (12); the motor rotor (12) is fixed to the rotor chassis (6) by bolts (9); a third bearing (7) is installed between the rotor chassis (6) and the bracket (5); The motor shaft (11) has a central hole and multiple pins at one end near the rotor chassis (6). The front end of the rotor chassis (6) and the central hole (111) of the motor shaft (11) are matched, and the motor rotor (12) is fixed by bolts (9) and pins.

2. The motor according to claim 1, characterized in that, The rotor chassis (6) is provided with bolt holes (61), pin holes (62) and bearing retainer rings (63), which are used to fix the inner ring of the bearing; the end of the rotor chassis (6) extending toward the third bearing (7) is connected to a bearing lower pressure sleeve (8) by a thread, and the inner hole of the bearing lower pressure sleeve (8) is provided with threads.

3. The motor according to claim 2, characterized in that, One end of the bracket (5) is equipped with an oil seal pressure plate (51) and an oil seal (52); the inner diameter of the oil seal (52) is tightly connected to the outer side of the bearing lower pressure sleeve (8), and the oil seal plays a sealing role.

4. The motor according to claim 1, characterized in that, The third bearing (7) has a bearing pressure plate (10) at one end extending toward the rotor chassis (6). The bearing pressure plate (10) is used to fix the outer ring of the bearing. The bearing pressure plate (10) is fixedly connected by bolts and brackets (5).

5. The motor according to claim 4, characterized in that, The bearing pressure plate (10) is provided with a grease nipple (101). The grease flows through the grease nipple (101) to the lubrication groove (102) and then flows into the roller of the third bearing (7). The lubrication groove (102) is located directly opposite the roller of the third bearing (7).

6. The motor according to claim 1, characterized in that, The bracket (5) is provided with an air inlet (53).

7. The motor according to claim 1, characterized in that, The bracket (5) is made of cast aluminum alloy.

8. The motor according to claim 1, characterized in that, The third bearing (7) is a NU type cylindrical roller bearing.

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