A servo press transmission structure

Abstract

The present invention belongs to the technical field of presses, and specifically relates to a servo press transmission structure. When the servo press is mass-produced, the servo motor is easy to install, and it is easy to disassemble and maintain later; and the servo motor plus a first-stage water-cooled gearbox structure is adopted, which not only reduces the manufacturing cost, but also further increases the input speed, thereby increasing the number of strokes of the press. It includes a servo motor arranged on a machine body, a motor encoder of a motor shaft is arranged at the rear end of the servo motor, the motor shaft at the front end of the servo motor is connected to the gear shaft through a water-cooled gearbox, and the small gear at the front end of the gear shaft is meshed with the large gear arranged at the end of the crankshaft; the output end of the water-cooled gearbox is connected to the rear end of the gear shaft, and the input end of the water-cooled gearbox is connected to the output end of the motor shaft of the servo motor.

Description

Technical Field

[0001] The invention belongs to the technical field of presses, and in particular relates to a transmission structure of a servo press. Background Art

[0002] At present, more and more domestic servo mechanical press manufacturers adopt adaptive control technology, use servo motor to drive the crank slider mechanism, and control the speed of the servo motor through the computer. The position of the slider relative to the motor angle can be accurately controlled, and the position and speed of the press hammer can be further accurately controlled to meet the requirements of the production and processing technology for the hammer speed characteristics. At the same time, because the large gear and gear shaft in the main transmission structure of the servo press are oil-immersed and lubricated, and the gear shaft is installed in the gear oil tank, the connection between the gear shaft and the servo motor must be a sealed structure, and the installation of the servo motor must be reliable, gap-free, and easy to disassemble for subsequent maintenance and repair. Therefore, a reasonable servo motor installation structure is very critical.

[0003] There are three main types of servo press transmission structures in the prior art: the first type is that the servo motor extension shaft is a flat key shaft structure, and the motor is fixed by a base. This type of structure is very common in asynchronous motors, and its characteristics are simple processing and convenient installation, and low manufacturing cost. However, this type of structure is not so suitable for use in servo presses, because the motor of a servo press is different from an asynchronous motor. The servo press motor requires frequent acceleration and deceleration and forward and reverse direction conversion during operation. If a flat key connection structure is adopted, due to the low strength of the key connection and the existence of a gap, the gap will become larger and larger after working for a period of time, which will make the dynamic response accuracy of the servo motor worse, and the comprehensive accuracy performance of the machine tool cannot be guaranteed. If the flat key connection adopts an overly tight fit, it will be very inconvenient to assemble and disassemble, and even difficult to install. And it is difficult to ensure the coaxiality of the motor main shaft and the gear shaft after installation by fixing the entire motor by the base. Because it is a rigid connection, it is difficult to ensure the accuracy when the motor runs at high speed.

[0004] The second is that the servo motor's extended shaft is a smooth shaft structure, the gear shaft and the motor shaft are connected by a coupling, and the motor is fixed by a base. Since it is connected by a coupling, there is a certain degree of flexibility, so the base fixing method is relatively acceptable, but because a large inertia coupling is added to the output shaft end, the passive inertia increases significantly, the energy consumption of the servo motor increases, and the efficiency decreases. In addition, the manufacturing cost increases due to the addition of a coupling.

[0005] The third method is to make the gear shaft of the servo press and the rotor shaft of the motor into an integrated structure, and the rotor shaft and the rotor are installed through a locking sleeve. The brake and motor encoder are installed at the rear end of the motor, and the motor is directly fixed to the gear box through a flange. This type of structure is also a commonly used structure at present. The advantages of this type of structure are compact structure, high connection strength, and large transmission torque. It is also an interference fastening connection. The dynamic response accuracy of the servo motor is not affected when it is in forward and reverse rotation and frequent acceleration and deceleration. For large machine tools and single-piece production, its structure is very suitable. However, for small and medium-sized batch production machine tools, its biggest disadvantage is that the gear shaft and the rotor shaft are integrated, and the gear shaft is easy to wear and often needs to be disassembled and repaired. In order to repair the gear shaft of this structure, the entire motor needs to be disassembled, and the brake at the rear end of the motor needs to be disassembled. It is very troublesome to disassemble and install a large torque servo motor outside the motor factory, which is basically unrealistic. Therefore, the gear shaft of this type of structure is very difficult to maintain and disassemble. It is also very troublesome for mass production. The current practice is that the main engine factory pairs the gear shaft with the large gear and sends it to the motor factory, which is responsible for completing the assembly of the gear shaft and the motor body, and then sends it to the main engine factory for overall installation. Its manufacturing cycle is long, and if there is a slight problem in the manufacturing process, rework is very troublesome. The subsequent need to repair the brake or disassemble the gear shaft requires the motor to be disassembled and reassembled, and on-site repair is basically unrealistic. In addition, in all the above transmission structures, the servo motor and the gear shaft are directly connected and use a first-stage gear transmission. The transmission ratio of the first-stage gear transmission is limited, and the maximum is only about 8. For medium and large tonnage servo presses, the torque of the servo motor will be very large, and the cost of the servo motor will be very high, its economy will be poor, and the motor input speed cannot be too high. Summary of the invention

[0006] The present invention aims at the defects of the prior art and provides a servo press transmission structure, which is convenient for the installation of the servo motor during mass production of the servo press, and is convenient for subsequent disassembly and maintenance. At the same time, the connection strength after installation is high enough, the connection is gapless, the connection is reliable, and the dynamic response accuracy is good. In addition, in order to further reduce the input torque of the servo motor to reduce the manufacturing cost, a servo motor plus a first-stage water-cooled gearbox structure is used, which not only reduces the manufacturing cost, but also further increases the input speed, thereby increasing the number of strokes of the press.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a servo press transmission structure, including a servo motor arranged on a machine body, characterized in that a motor encoder of a motor shaft is arranged at the rear end of the servo motor, and the motor shaft at the front end of the servo motor is connected to the gear shaft through a water-cooled gear box, and the small gear at the front end of the gear shaft is meshed with the large gear arranged at the end of the crankshaft; the output end of the water-cooled gear box is connected to the rear end of the gear shaft, and the input end of the water-cooled gear box is connected to the output end of the motor shaft of the servo motor.

[0008] Furthermore, the water-cooled gearbox includes a gearbox body, the input end of the gearbox body is provided with an internal spline of the gearbox input end, the internal spline of the gearbox input end is connected to the external spline of the motor shaft output end of the servo motor; and the motor housing flange of the servo motor is fixedly connected to the body through a motor adapter flange.

[0009] Furthermore, the output end of the gear box body of the water-cooled gear box is provided with a hollow shaft at the output end of the gear box, and the rear end of the gear shaft is installed in the hollow shaft at the output end of the gear box of the water-cooled gear box and is locked and fixed by a locking disk.

[0010] Furthermore, the gear box flange on the gear box body of the water-cooled gear box is fixedly connected to the machine body via a gear box adapter flange.

[0011] Furthermore, a bearing assembly is provided between the rear end of the gear shaft and the gear box adapter flange.

[0012] Furthermore, the bearing assembly includes a bearing, an outer ring of the bearing is pressed and fixed by a bearing end cover connected to the gear box adapter flange, and an inner ring of the bearing is pressed and fixed by a fixing nut arranged at the rear end of the gear shaft.

[0013] Furthermore, sealing components are respectively provided between the gear box adapter flange and the rear end of the gear shaft, and between the gear box adapter flange and the machine body.

[0014] Furthermore, the sealing assembly includes a rotary oil seal arranged between the gear box adapter flange and the rear end of the gear shaft, and an O-ring arranged between the gear box adapter flange and the body.

[0015] Furthermore, the front end of the gear shaft is connected to the machine body through a gear shaft support bearing, and the end side of the gear shaft support bearing is sealed by a gear shaft end cover; at the same time, a brake is provided at the front end of the gear shaft and the end located outside the gear shaft end cover.

[0016] A method for installing a servo press transmission structure comprises the following steps:

[0017] Step 1: Install the motor shaft and motor rotor of the servo motor. First, inject high-pressure oil through the oil hole to expand the rotor conical hole. Then, press the motor shaft into the rotor conical hole, and then remove the high-pressure oil to make the conical surface of the rotor conical hole hug the motor shaft, thereby forming a gap-free fixed connection between the motor shaft and the motor rotor. The motor encoder is installed at the rear end of the servo motor.

[0018] Step 2: Assemble the gear shaft and the water-cooled gear box, install the rear end of the gear shaft in the hollow shaft at the output end of the water-cooled gear box, and use a locking plate to fix the rear end of the gear shaft to the output end of the water-cooled gear box; at the same time, the gear shaft is ensured to be installed coaxially through the gear shaft positioning hole, and the gear box locking plate is used to ensure gap-free installation;

[0019] Step 3: Insert the gearbox adapter flange from the other end of the gear shaft that is not connected to the water-cooled gearbox, and fix the gearbox adapter flange to the gearbox flange of the water-cooled gearbox; then, install the rotary oil seal and the bearing, and press the outer ring of the bearing through the bearing end cover, and press the inner ring of the bearing with the fixing nut; then, install the O-ring on the outer ring of the gearbox adapter flange, so that the gear shaft and the water-cooled gearbox form a sealed whole through the gearbox adapter flange;

[0020] Step 4: The gear shaft and water-cooled gear box are connected as one, and fixed to the machine body as a whole through the outer ring screws on the gear box adapter flange;

[0021] Step 5: The end of the gear shaft that meshes with the large gear at the end of the crankshaft is connected to the body sealing support through the gear shaft support bearing and the gear shaft end cover; and a brake is provided at the front end of the gear shaft, at the end outside the gear shaft end cover;

[0022] Step six: The internal spline of the gearbox input end at the water-cooled gearbox input end is connected to the external spline shaft at the servo motor output end. The outer circle of the input end of the water-cooled gearbox is positioned with the motor adapter flange hole of the servo motor, and the servo motor is fixedly installed on the motor adapter flange, and then the motor adapter flange is installed on the machine body.

[0023] Compared with the prior art, the invention has the beneficial effects.

[0024] 1. The present invention solves the problem of sealing and preventing oil leakage after the gear shaft and the motor main shaft are connected in the servo press motor installation structure. The motor and the gear shaft can be repeatedly installed and disassembled easily and conveniently, and the connection is reliable, which is very suitable for mass production.

[0025] 2. Due to the interference fit between the motor shaft and the motor rotor of the servo motor, there is no gap, and the dynamic response accuracy is not affected after connection. The control accuracy of the servo motor's forward and reverse rotation and acceleration and deceleration is high.

[0026] 3. The setting of the gearbox adapter flange and the water-cooled gearbox enables the subsequent repeated disassembly, repair of the gear shaft or replacement of the brake and repair of the servo motor to be disassembled and maintained separately, providing a convenient and feasible solution for subsequent repair and maintenance.

[0027] 4. A water-cooled gearbox is added between the servo motor and the gear shaft. This not only reduces the manufacturing cost by reducing the torque of the servo motor, but also, due to the use of a water-cooled gearbox, its thermal power is allowed to increase, thereby increasing the allowable input speed at the motor input end. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. The protection scope of the present invention is not limited to the following description.

[0029] Figure 1 It is a structural schematic diagram of an embodiment of the present invention.

[0030] In the figure, 1 is a machine body, 2 is a gearbox adapter flange, 3 is a servo motor, 4 is a motor encoder, 5 is a motor shaft, 6 is a water-cooled gearbox, 7 is a rotary oil seal, 8 is an O-ring, 9 is a bearing, 10 is a bearing end cover, 11 is a fixing nut, 12 is a gear shaft, 13 is a gear shaft support bearing, 14 is a gear shaft end cover, 15 is a brake, 16 is a motor adapter flange, 301 is a motor housing flange, 302 is a motor stator, 303 is a motor rotor, 304 is a motor encoder support bearing, 305 is a motor encoder shaft connector, 306 is a motor encoder fixed end cover, 501 is a tapered surface, 502 is an oil hole, 503 is a gear shaft positioning hole, 504 is a gear shaft fixing hole, 601 is a gearbox input end internal spline, 602 is a gearbox output end hollow shaft, and 603 is a locking disk. DETAILED DESCRIPTION

[0031] according to Figure 1 The specific structure of the present invention is described in detail. The transmission structure of the servo press comprises a servo motor 3 arranged on a machine body 1, a motor encoder 4 of a motor shaft 5 is arranged at the rear end of the servo motor 3, the motor shaft 5 at the front end of the servo motor 3 is connected to a gear shaft 12 through a water-cooled gear box 6, and a small gear at the front end of the gear shaft 12 is meshed with a large gear arranged at the end of a crankshaft arranged on the machine body 1; the output end of the water-cooled gear box 6 is connected to the rear end of the gear shaft 12, and the input end of the water-cooled gear box 6 is connected to the output end of the motor shaft 5 of the servo motor 3.

[0032] The water-cooled gearbox 6 includes a gearbox body, and the input end of the gearbox body is provided with an internal spline 601 at the input end of the gearbox, which is connected to the external spline at the output end of the motor shaft 5 of the servo motor 3; and the motor housing flange 301 of the servo motor 3 is fixedly connected to the machine body 1 through the motor adapter flange 16. The output end of the gearbox body of the water-cooled gearbox 6 is provided with a hollow shaft 602 at the output end of the gearbox, and the rear end of the gear shaft 12 is installed in the hollow shaft 602 at the output end of the gearbox of the water-cooled gearbox 6 and is locked and fixed by a locking disk 603. The gearbox flange on the gearbox body of the water-cooled gearbox 6 is fixedly connected to the machine body 1 through the gearbox adapter flange 2.

[0033] A bearing assembly is provided between the rear end of the gear shaft 12 and the gearbox adapter flange 2. The bearing assembly includes a bearing 9, the outer ring of the bearing 9 is pressed and fixed by a bearing end cover 10 connected to the gearbox adapter flange 2, and the inner ring of the bearing 9 is pressed and fixed by a fixing nut 11 provided at the rear end of the gear shaft 12. In addition, a sealing assembly is provided between the gearbox adapter flange 2 and the rear end of the gear shaft 12, and between the gearbox adapter flange 2 and the body 1. The sealing assembly includes a rotary oil seal 7 provided between the gearbox adapter flange 2 and the rear end of the gear shaft 12, and an O-ring 8 provided between the gearbox adapter flange 2 and the body 1. The front end of the gear shaft 12 is connected to the body 1 through a gear shaft support bearing 13, and the end side of the gear shaft support bearing 13 is sealed by a gear shaft end cover 14; at the same time, a brake 15 is provided at the front end of the gear shaft 12, at the end outside the gear shaft end cover 14.

[0034] The installation method of the servo press transmission structure includes the following steps: Step 1, the installation of the motor shaft 5 of the servo motor 3 and the motor rotor 303, first, injecting high-pressure oil through the oil hole 502 to expand the rotor conical hole, then pressing the motor shaft 5 into the rotor conical hole, and then pumping out the high-pressure oil to make the conical surface 501 of the rotor conical hole hug the motor shaft 5, thereby forming a gap-free fixed connection between the motor shaft 5 and the motor rotor 303; the rear end of the servo motor 3 is installed with a motor encoder 4.

[0035] Step 2, the combination of the gear shaft 12 and the water-cooled gear box 6, the rear end of the gear shaft 12 is installed in the hollow shaft 602 at the gear box output end of the water-cooled gear box 6, and the rear end of the gear shaft 12 is fixed to the output end of the water-cooled gear box 6 by using the locking plate 603; at the same time, the gear shaft 12 is ensured to have coaxiality through the gear shaft positioning hole 503, and the gear box locking plate 603 is used to ensure gap-free installation.

[0036] Step three, pass the gear box adapter flange 2 through the other end of the gear shaft 12 that is not connected to the water-cooled gear box 6, and fix the gear box adapter flange 2 to the gear box flange of the water-cooled gear box 6; then, install the rotary oil seal 7 and the bearing 9, and press the outer ring of the bearing 9 through the bearing end cover 10, and press the inner ring of the bearing 9 with the fixing nut 11; then, install the O-ring 8 on the outer ring of the gear box adapter flange 2, so that the gear shaft 12 and the water-cooled gear box 6 form a sealed whole through the gear box adapter flange 2.

[0037] Step 4: The gear shaft 12 and the water-cooled gear box 6 are connected as one, and are fixed on the machine body 1 as a whole through the outer ring screws on the gear box adapter flange 2.

[0038] Step 5: The end of the gear shaft 12 that meshes with the large gear at the end of the crankshaft is sealed and supported by the body 1 through the gear shaft support bearing 13 and the gear shaft end cover 14; and a brake 15 is provided at the front end of the gear shaft 12, at the end outside the gear shaft end cover 14. The brake 15 can also be installed at the rear end of the servo motor 3 according to specific usage requirements.

[0039] Step six, the internal spline 601 of the gear box input end of the water-cooled gear box 6 is connected to the external spline shaft of the servo motor 3 output end, the outer circle of the input end of the water-cooled gear box 6 is positioned with the motor adapter flange 16 hole of the servo motor 3, and the servo motor 3 is fixedly installed on the motor adapter flange 16, and then the motor adapter flange 16 is installed on the body 1.

[0040] A specific embodiment of the present invention: the servo press transmission structure includes a body 1, a gear box adapter flange 2, a servo motor 3, a motor encoder 4, a motor shaft 5, a water-cooled gear box 6, a rotary oil seal 7, an O-ring 8, a bearing 9, a bearing end cover 10, a fixing nut 11, a gear shaft 12, a gear shaft support bearing 13, a gear shaft end cover 14, a brake 15, and a motor adapter flange 6. Among them, the servo motor 3 includes a motor housing flange 301, a motor stator 302, a motor rotor 303, a motor encoder support bearing 304, a motor encoder shaft connector 305, and a motor encoder fixed end cover 306. The motor shaft 5 includes a tapered surface 501, an oil hole 502, a gear shaft positioning hole 503, and a gear shaft fixing hole.

[0041] The water-cooled gearbox 6 comprises a gearbox body, an input internal spline 601, an output hollow shaft 602, and a locking plate structure 603. Its transmission structure is as follows: one end of the gear shaft 12 is fixedly mounted with the water-cooled gearbox 6 through the locking plate 603, the gear shaft is ensured to be coaxially mounted through the gear shaft positioning hole 503, and the gearbox locking plate 603 is used to ensure gap-free installation. A motor encoder 4 is installed at the rear end of the servo motor 3.

[0042] The installation structure and method of the motor shaft 5 and the motor rotor 303 are as follows: high-pressure oil is injected through the oil hole to open the conical hole in the middle of the rotor, and then the motor shaft 5 is pressed into the conical hole of the rotor, and then the high-pressure oil is withdrawn to make the conical surface 501 of the conical hole hug the motor shaft 5, thereby forming a gapless fixed connection. The motor stator 302 is fixed on the motor housing, and the motor rotor 303 and the motor shaft 5 are fixedly connected by the conical surface interference fit, and the connection is reliable and very convenient to disassemble. When disassembling, it is only necessary to inject high-pressure oil to open the conical surface 501 of the conical hole, and the motor shaft 5 and the motor rotor 303 are fixedly installed. The gear shaft 12 is installed in the hollow shaft 602 of the gear box, and then locked with a locking disk 603. The gear shaft 12 is fixed to the output end of the gear box, and the combination of the gear shaft 12 and the water-cooled gear box 6 is completed.

[0043] Subsequently, the gearbox adapter flange 2 is passed through the other end of the gear shaft 12, and the gearbox flange is fixedly connected to the gearbox adapter flange 2; then, the rotary oil seal 7 and the bearing 9 are installed, and the outer ring of the bearing is pressed by the bearing end cover 10, and the inner ring of the bearing is pressed by the fixing nut, and the O-ring 8 is installed in the outer ring of the gearbox adapter flange 2. Thus, the gear shaft 12 and the water-cooled gearbox 6 are connected to form a sealed whole through the gearbox adapter flange 2, and the whole can be fixed to the body through the outer ring screws of the gearbox adapter flange 2. The other end of the gear shaft 12 is sealed and supported by the gear shaft end cover 14, and the brake 15 is installed on the outside. The inner spline 601 at the other end of the water-cooled gearbox 6 is connected to the outer spline shaft of the servo motor 3, and the outer circle of the input end of the water-cooled gearbox 6 is positioned with the motor adapter flange hole. The servo motor 3 is fixedly mounted on the motor adapter flange 16, and the motor adapter flange 16 is mounted on the body 1.

[0044] If disassembly and maintenance are required, the brake 15, gear shaft 12, gear box 6 and servo motor 3 can be removed and repaired separately. The transmission structure of the servo press is easy to disassemble and easy to reinstall, which is very suitable for mass production and later maintenance.

[0045] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. A servo press transmission structure, comprising a servo motor (3) arranged on a machine body (1), characterized in that: A motor encoder (4) of a motor shaft (5) is disposed at the rear end of the servo motor (3); the motor shaft (5) at the front end of the servo motor (3) is connected to a gear shaft (12) via a water-cooled gear box (6); and a small gear at the front end of the gear shaft (12) meshes with a large gear disposed at the end of the crankshaft; an output end of the water-cooled gear box (6) is connected to the rear end of the gear shaft (12), and an input end of the water-cooled gear box (6) is connected to the output end of the motor shaft (5) of the servo motor (3); the water-cooled gear box (6) comprises a gear box body, and a gear box input The gear box (6) has an internal spline (601) at the input end, the internal spline (601) at the input end of the gear box is connected to the external spline at the output end of the motor shaft (5) of the servo motor (3); and the motor housing flange (301) of the servo motor (3) is fixedly connected to the body (1) via a motor adapter flange (16); the output end of the gear box body of the water-cooled gear box (6) is provided with a hollow shaft (602) at the output end of the gear box, the rear end of the gear shaft (12) is installed in the hollow shaft (602) at the output end of the gear box of the water-cooled gear box (6), and is locked and fixed by a locking disk (603); the water-cooled gear box (6 ) is fixedly connected to the machine body (1) via a gearbox adapter flange (2); a bearing assembly is arranged between the rear end of the gear shaft (12) and the gearbox adapter flange (2); the bearing assembly comprises a bearing (9), the outer ring of the bearing (9) is pressed and fixed by a bearing end cover (10) connected to the gearbox adapter flange (2), and the inner ring of the bearing (9) is pressed and fixed by a fixing nut (11) arranged at the rear end of the gear shaft (12); the gearbox adapter flange (2) and the rear end of the gear shaft (12), and the gearbox adapter flange (2) and the machine body are connected. (1), each of which is provided with a sealing assembly; the sealing assembly comprises a rotating oil seal (7) provided between the gearbox adapter flange (2) and the rear end of the gear shaft (12), and an O-ring (8) provided between the gearbox adapter flange (2) and the machine body (1); the front end of the gear shaft (12) is connected to the machine body (1) via a gear shaft support bearing (13), and the end side of the gear shaft support bearing (13) is sealed by a gear shaft end cover (14); at the same time, a brake (15) is provided at the front end of the gear shaft (12) and at the end outside the gear shaft end cover (14); The installation method of the servo press transmission structure comprises the following steps: Step 1: installing the motor shaft (5) and the motor rotor (303) of the servo motor (3), first, injecting high-pressure oil through the oil hole (502) to expand the rotor conical hole, then pressing the motor shaft (5) into the rotor conical hole, and then pumping out the high-pressure oil to make the conical surface (501) of the rotor conical hole tightly hold the motor shaft (5), thereby forming a gap-free fixed connection between the motor shaft (5) and the motor rotor (303); a motor encoder (4) is installed at the rear end of the servo motor (3); Step 2: Assemble the gear shaft (12) and the water-cooled gear box (6), install the rear end of the gear shaft (12) in the hollow shaft (602) at the output end of the water-cooled gear box (6), and use a locking plate (603) to fix the rear end of the gear shaft (12) to the output end of the water-cooled gear box (6); at the same time, ensure the coaxiality of the gear shaft (12) through the gear shaft positioning hole (503), and use the gear box locking plate (603) to ensure gap-free installation; Step 3: insert the gearbox adapter flange (2) from the other end of the gear shaft (12) that is not connected to the water-cooled gear box (6), and fix the gearbox adapter flange (2) to the gearbox flange of the water-cooled gear box (6); then, install the rotary oil seal (7) and the bearing (9), and press the outer ring of the bearing (9) through the bearing end cover (10), and press the inner ring of the bearing (9) with the fixing nut (11); then, install the O-ring (8) on the outer ring of the gearbox adapter flange (2), so that the gear shaft (12) and the water-cooled gear box (6) form a sealed whole through the gearbox adapter flange (2); Step 4: The gear shaft (12) and the water-cooled gear box (6) are connected as one body, and are fixed as a whole to the machine body (1) by means of the outer ring screws on the gear box adapter flange (2); Step 5: The end of the gear shaft (12) that meshes with the large gear at the end of the crankshaft is connected to the body (1) through a gear shaft support bearing (13) and a gear shaft end cover (14). In addition, a brake (15) is provided at the front end of the gear shaft (12) and at the end outside the gear shaft end cover (14). Step 6: The internal spline (601) of the input end of the water-cooled gearbox (6) is connected to the external spline shaft of the output end of the servo motor (3), the outer circle of the input end of the water-cooled gearbox (6) is positioned with the hole of the motor adapter flange (16) of the servo motor (3), and the servo motor (3) is fixedly mounted on the motor adapter flange (16), and then the motor adapter flange (16) is mounted on the machine body (1).

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