CN210802908U

CN210802908U - Engine test bed thrust measurement hanging bracket and mounting rack thereof

Info

Publication number: CN210802908U
Application number: CN201922036896.XU
Authority: CN
Inventors: 康宏博; 王文彬; 许海涛
Original assignee: Beijing Aerospace Sanfa High Tech Co Ltd
Current assignee: Beijing Aerospace Sanfa High Tech Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-06-19
Anticipated expiration: 2029-11-22

Abstract

A thrust measurement hanging bracket of an engine test bed comprises a front beam, a rear beam and a longitudinal beam, wherein the front beam and the rear beam are arranged in parallel and are fixedly connected with the longitudinal beam, the rear beam is fixedly connected with one end of the longitudinal beam, and the front beam, the rear beam and the longitudinal beam form a 'soil' shape; the longitudinal beam is provided with mounting holes for mounting the front joint and the rear joint. The utility model discloses an engine test bench thrust measurement gallows is used for installing the mounting hole that connects before and the rear joint through the setting, realizes that a gallows is applicable to polytype engine, has improved adaptability by a wide margin, and has saved a large amount of resources.

Description

Engine test bed thrust measurement hanging bracket and mounting rack thereof

Technical Field

The utility model belongs to the technical field of the thrust measurement technique and specifically relates to an engine test bench thrust measurement gallows and mounting bracket thereof.

Background

The engine test and test technology is an important component of the solid propulsion technology, and the thrust measurement is an important parameter to be measured in the engine test and test. To study engine thrust, numerous trial and error tests are required, which are not possible if all are put into flight tests. The main reasons are high flight test cost, long period, small information yield, risk and large manpower consumption. The engine ground test is to perform static test on the system according to specific conditions and environmental requirements on the ground to obtain various performance index information describing the system, so as to solve the key problem in the engine thrust test process.

Disclosure of Invention

The technical solution problem of the utility model is that: the defects of the prior art are overcome, and the engine test bed thrust measurement hanging bracket and the mounting frame thereof are provided.

The technical solution of the utility model is that: a thrust measurement hanging bracket of an engine test bed comprises a front beam, a rear beam and a longitudinal beam, wherein the front beam and the rear beam are arranged in parallel and are fixedly connected with the longitudinal beam, the rear beam is fixedly connected with one end of the longitudinal beam, and the front beam, the rear beam and the longitudinal beam form a 'soil' shape; the longitudinal beam is provided with mounting holes for mounting the front joint and the rear joint.

Further, the engine test bed thrust measurement hanging bracket comprises a front joint and a rear joint, and the front joint and the rear joint are detachably mounted in the mounting hole.

Further, the engine test bed thrust measurement mounting frame comprising the engine test bed thrust measurement hanging bracket comprises a left upright post and a right upright post which are identical in structure, and the bottom surfaces of the left upright post and the right upright post are detachably connected with the movable frame; the engine mounting hanger is fixedly connected with the top surfaces of the left upright post and the right upright post to form a gantry type.

Compared with the prior art, the utility model the advantage lie in:

1. the utility model discloses an engine test bench thrust measurement gallows is used for installing the mounting hole that connects before and the rear joint through the setting, realizes that a gallows is applicable to polytype engine, has improved adaptability by a wide margin, and has saved a large amount of resources.

2. Engine test bench thrust measurement gallows and mounting bracket thereof adopts planer-type engine mounting bracket, hangs the engine setting, has improved the measurement accuracy of engine thrust to it is adjustable to set up front connector and rear joint position, has improved the application scope of engine mounting bracket by a wide margin, has solved the problem that an engine set up an engine mounting bracket in the past.

Drawings

Fig. 1 is the utility model discloses a structural schematic of engine test bench thrust measurement gallows.

Fig. 2 is a front view of an engine mounting bracket including the thrust measurement hanger of the engine test stand of the present invention.

Fig. 3 is a structural side view of an engine mounting bracket including the thrust measurement hanger of the engine test stand of the present invention.

Fig. 4 is a front view of an engine thrust stand including the thrust measurement hanger of the engine test stand according to an exemplary embodiment of the present invention.

Fig. 5 is a front view of an engine thrust stand including an engine test stand thrust measurement hanger according to another embodiment of the present invention.

Fig. 6 is an enlarged view of a portion a in fig. 4 or 5.

Fig. 7 is an enlarged view of a portion B in fig. 4 or 5.

Fig. 8 is a top view of an engine thrust stand including the thrust measurement hanger of the present invention.

Fig. 9 is an enlarged view of the portion C of fig. 8.

Fig. 10 is a schematic structural diagram of a measurement section bracket in an engine thrust rack containing the thrust measurement hanging bracket of the engine test stand of the present invention.

Fig. 11 is an enlarged view of a portion D in fig. 10.

Fig. 12 is an enlarged view of a portion E of fig. 10.

Fig. 13 is the engine thrust rack that contains the utility model discloses an engine test bench thrust measurement gallows, the principle schematic diagram of force sensor calibration.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "abutted" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

An engine mounting hanger 610 comprises a front beam 611, a rear beam 612 and a longitudinal beam 613, wherein the front beam 611 and the rear beam 612 are arranged in parallel and are fixedly connected with the longitudinal beam 613, the rear beam 612 is fixedly connected with one end of the longitudinal beam 613, and the front beam 611, the rear beam 612 and the longitudinal beam 613 form a shape like the Chinese character 'tu'; the longitudinal beam 613 is provided with a mounting hole 614 for mounting a front joint 640 and a rear joint 650.

The engine mounting bracket 600 comprises the engine mounting hanger 610, wherein the engine mounting bracket 600 comprises the engine mounting hanger 610, a left upright post 620 and a right upright post 630 which are identical in structure, a front joint 640, a rear joint 650 and a lifting lug 660; the bottom surfaces of the left upright post 620 and the right upright post 630 are detachably connected with the movable frame 200; the engine mounting hanger 610 is fixedly connected with the top surfaces of the left upright 620 and the right upright 630 to form a gantry type, the front joint 640 and the rear joint 650 are detachably mounted on the engine mounting hanger 610, and the lifting lug 660 is fixedly connected with the engine mounting hanger 610; the left upright post 620 comprises a front post 621, a rear post 622 and upright post connecting rods 623, wherein the front post 621 and the rear post 622 are arranged in parallel and are fixedly connected through the upright post connecting rods 623.

An engine thrust measuring rack comprising the engine mounting rack 600 comprises a fixed rack 100, a movable rack 200, a loading measuring device and a measuring section 400; the loading measuring device comprises a spring piece, a loading mechanism 330 and a working force sensor 350; the movable frame 200 is suspended on the fixed frame 100 through the spring piece, the loading mechanism 330 is fixedly installed on the fixed frame 100, two ends of the working force sensor 350 are respectively connected with the fixed frame 100 and the movable frame 200, and the measuring section 400 is fixedly installed on the movable frame 200.

The fixed frame 100 comprises a base 110, a front mounting seat 120, a loading mechanism mounting seat 130, a first fixed frame spring piece mounting seat 140, a fixed frame working force sensor mounting seat 150, a rear mounting seat 160 and a second fixed frame spring piece mounting seat 170; the base 110 is of a cuboid structure, the front mounting seat 120 and the rear mounting seat 160 are respectively and fixedly mounted at the front end and the rear end of the base 110 along the length direction of the base 110, the rear mounting seat 160 comprises a transverse plate and a vertical plate, and the transverse plate and the vertical plate form an L shape; the loading mechanism mounting seat 130 is fixedly mounted on the front mounting seat 120, the first fixed frame spring leaf mounting seat 140 includes a first right fixed frame spring leaf mounting seat 141 and a first left fixed frame spring leaf mounting seat 142, and the first right fixed frame spring leaf mounting seat 141 and the first left fixed frame spring leaf mounting seat 142 are fixedly mounted at the front end of the base 110 and are respectively located on two sides of the front mounting seat 120; the fixed frame working force sensor mounting seat 150 is fixedly mounted on the base 110 and is positioned on a central line along the length direction of the base 110; the second fixed frame spring piece mounting seat 170 includes a second right fixed frame spring piece mounting seat 171 and a second left fixed frame spring piece mounting seat 172, and the second right fixed frame spring piece mounting seat 171 and the second left fixed frame spring piece mounting seat 172 are fixedly mounted at the rear end of the base 110 and respectively located at two sides of the rear mounting seat 160.

The movable frame 200 comprises a movable frame body 210, a first movable frame spring piece mounting seat 220, a movable frame working force sensor mounting seat 230, a second movable frame spring piece mounting seat 240 and a movable frame standard force sensor mounting seat 250, wherein the movable frame body 210 comprises a right movable frame body 211, a left movable frame body 212 and a movable frame connecting plate 260, the right movable frame body 211 and the left movable frame body 212 are identical in structure, both of which are cuboid structures and are parallel to the base 110, the central line of the right movable frame body 211 and the left movable frame body 212 in the length direction is parallel to the central line of the base 110 in the length direction, the right movable frame body 211 and the left movable frame body 212 are symmetrically arranged relative to the central line of the base 110 in the length direction, the number of the movable frame connecting plates 260 is multiple, and the right movable frame body 211 and the left movable frame body 212 are fixedly connected by the plurality of the movable frame connecting plates 260; along the length direction of the movable frame body 210, a movable frame standard force sensor mounting seat 250 is fixedly mounted on the bottom surface of the front end of the movable frame body 210; the first moving frame spring piece mounting seat 220 comprises a first right moving frame spring piece mounting seat and a first left moving frame spring piece mounting seat, and the first right moving frame spring piece mounting seat and the first left moving frame spring piece mounting seat are respectively fixedly mounted on the bottom surfaces of the front ends of the right moving frame body 211 and the left moving frame body 212 and are respectively positioned on two sides of the moving frame standard force sensor mounting seat 250; the movable frame working force sensor mounting base 230 is fixedly mounted at the bottom of one movable frame connecting plate 260 of the movable frame body 210 and is located on a central line along the length direction of the movable frame body 210; the second moving frame spring piece mounting seat 240 comprises a second right moving frame spring piece mounting seat and a second left moving frame spring piece mounting seat, and the second right moving frame spring piece mounting seat and the second left moving frame spring piece mounting seat are fixedly mounted on the bottom surfaces of the rear ends of the right moving frame body 211 and the left moving frame body 212 respectively.

The loading measuring device comprises a first spring plate 310, a second spring plate 320, a loading mechanism 330, a standard force sensor 340 and a working force sensor 350; the first spring piece 310 comprises a first right spring piece 311 and a first left spring piece 312, two ends of the first right spring piece 311 are respectively and fixedly connected with a first right fixed frame spring piece mounting seat 141 and a first right movable frame spring piece mounting seat, and two ends of the first left spring piece 312 are respectively and fixedly connected with a first left fixed frame spring piece mounting seat 142 and a first left movable frame spring piece mounting seat; the second spring piece 320 comprises a second right spring piece 321 and a second left spring piece 322, two ends of the second right spring piece 321 are fixedly connected with the second right fixed frame spring piece mounting seat 171 and the second right movable frame spring piece mounting seat respectively, and two ends of the second left spring piece 322 are fixedly connected with the second left fixed frame spring piece mounting seat 172 and the second left movable frame spring piece mounting seat respectively; the loading mechanism 330 is fixedly mounted on a transverse plate of the front mounting seat 120, the standard force sensor 340 is fixedly mounted on a baffle plate at the front end of the movable frame body 210, and the loading mechanism 330 and the standard force sensor 340 are coaxially arranged and are parallel to the central line of the base 110 along the length direction; two ends of the working force sensor 350 are respectively and fixedly connected with the fixed frame working force sensor mounting seat 150 and the movable frame working force sensor mounting seat 230, and the working force sensor 350, the loading mechanism 330 and the standard force sensor 340 are coaxially arranged; the loading mechanism 330 comprises a servo motor, a motor power supply, a hydraulic loading device and a calibration oil cylinder, wherein the motor power supply is electrically connected with the servo motor, the servo motor is sequentially connected with the hydraulic loading device and the calibration oil cylinder, and a piston of the calibration oil cylinder is connected with a standard force sensor.

The measuring section 400 comprises a measuring section bracket for supporting the measuring pipe section 401, the measuring section bracket comprises a first measuring section bracket 410 and a second measuring section bracket 420 which are coaxially arranged, and the first measuring section bracket 410 and the second measuring section bracket 420 have the same structure and are both fixedly installed on the top surface of the movable frame body 210; the measuring section bracket comprises a measuring section bracket 411, a measuring section bracket lower ring 412, a measuring section bracket upper ring 413, a measuring section bracket positioning mechanism 414 and a locking device 415; the bottom surface of the measurement section bracket 411 is fixedly connected with the top surface of the movable frame body 210, the measurement section bracket lower ring 412 and the measurement section bracket upper ring 413 are both of a semicircular structure, and the measurement section bracket lower ring 412 and the measurement section bracket upper ring 413 are connected to form a circle; the measuring section bracket lower ring 412 and the measuring section bracket 411 are integrally formed; the number of the measuring section bracket positioning mechanisms 414 is 3, the structures of the measuring section bracket positioning mechanisms are the same, the measuring section bracket positioning mechanisms 401 are used for positioning and measuring the air intake parameters of the tested engine, the 3 measuring section bracket positioning mechanisms 414 are uniformly distributed along the radial direction of a circle formed by connecting the measuring section bracket lower ring 412 and the measuring section bracket upper ring 413, wherein one measuring section bracket positioning mechanism 414 is arranged at the top of the measuring section bracket upper ring 413, and the rest 2 measuring section bracket positioning mechanisms 414 are arranged on the measuring section bracket lower ring 412; the measuring section bracket positioning mechanism 414 comprises a positioning mechanism nut 4141, a positioning mechanism locking nut 4142 and a positioning mechanism screw 4143, the positioning mechanism screw 4143 passes through the measuring section bracket lower ring 412 or the measuring section bracket upper ring 413, the positioning mechanism locking nut 4142 is sleeved on the positioning mechanism screw 4143, is arranged on the outer side of the measuring section bracket lower ring 412 or the measuring section bracket upper ring 413 and is abutted against the measuring section bracket lower ring 412 or the measuring section bracket upper ring 413 and is used for locking the positioning mechanism screw 4143, and the positioning mechanism nut 4141 is sleeved on the positioning mechanism screw 4143 and is abutted against the positioning mechanism locking nut 4142; the number of the locking devices 415 is 2, and the structures of the locking devices are the same, and the locking devices 415 are used for fixedly connecting the lower ring 412 of the measurement section bracket and the upper ring 413 of the measurement section bracket, 2 locking devices 415 are arranged at the connecting ends of the lower ring 412 of the measurement section bracket and the upper ring 413 of the measurement section bracket, the locking device 415 includes an upper locking plate 4151, a lower locking plate 4152, a locking bolt 4153 and a locking nut 4154, the upper locking plate 4151 is fixedly attached to the front end surface of the upper ring 413 of the measurement section bracket, the lower surface of the upper locking plate 4151 coincides with the lower surface of the upper ring 413 of the measurement section bracket, the lower locking plate 4152 is fixedly attached to the front end surface of the measuring section bracket lower ring 412, the upper surface of the lower lock plate 4152 coincides with the upper surface of the measuring section bracket lower ring 412, the locking bolt 4153 passes through the lower and

upper locking plates

4152 and 4151 in sequence, the lock nut 4154 is engaged with the lock bolt 4153 and abuts against the upper lock plate 4151.

Preferably, the measuring pipe section 401 is a laval nozzle or a straight pipe section. When the air inlet parameter of the tested engine 1 is supersonic speed or sonic speed, the measuring pipe section 401 is a laval nozzle, specifically referring to fig. 1, and the specific structural form of the laval nozzle is referred to the prior application of the applicant (application number: CN201811164305.0, utility model name: an air inlet system of a supersonic engine test bed); when the intake parameter of the engine 1 to be tested is subsonic, the measurement pipe section 401 is a straight pipe section, see fig. 2 in particular.

Preferably, a temperature sensor and a pressure sensor are arranged in the measuring pipe section 401, and both the temperature sensor and the pressure sensor are arranged in the direction facing the airflow and are used for measuring the total pressure and the total temperature of the cross section of the sensor.

The engine thrust measuring rack comprises a locking device, the locking device comprises a fastening screw rod 510, a fastening baffle 520 and a fastening nut 530, the fastening screw rod 510 sequentially penetrates through a rear end baffle of the movable rack body 210, the fastening baffle 520, a vertical plate and a fastening nut 530 of the rear mounting seat 160, the fastening nut 530 is matched with the fastening screw rod 510, and the fastening baffle 520 and the fastening nut 530 are both abutted to the vertical plate of the rear mounting seat 160.

The engine thrust measurement rack comprises a force sensor calibration device, and the force sensor calibration device comprises an industrial personal computer, a display, a standard force sensor data acquisition device and a working force sensor data acquisition device; the industrial personal computer is respectively electrically connected with the display and the servo motor, the standard force sensor data acquisition device is respectively electrically connected with the standard force sensor and the industrial personal computer, and the working force sensor data acquisition device is respectively electrically connected with the working force sensor and the industrial personal computer.

1. The utility model discloses a contain in the thrust measurement rack of engine installation gallows, it decides the frame and sets up horizontal base, improves the whole load capacity who decides the frame.

2. The utility model discloses a contain in the thrust measurement rack of engine installation gallows, realized the measurement of engine thrust, simple structure.

3. The utility model discloses a contain in the thrust measurement rack of engine installation gallows, ingenious will move the frame and hang on the shelf through the spring leaf to be aided with the thrust of force sensor measurement engine, simple and easy.

4. The utility model discloses a contain in the thrust measurement rack of engine installation gallows, set up the measurement section bracket to it is coaxial with the engine to guarantee to be used for measuring the measurement section that is tried the engine air inlet parameter, has both guaranteed the engine precision of the simulation of admitting air, has improved the engine precision of parameter measurement of admitting air again.

5. The utility model discloses a contain in the thrust measurement rack of engine installation gallows, its moves a global rigidity great, for assurance test frame dynamic behavior, reasonable distribution atress component in the design adopts intensity principle such as structure, removes optimization design such as the not atress part of material, alleviates and moves a quality.

6. The utility model discloses a contain in the thrust measurement rack of engine installation gallows, set up the lock state, when making the engine install the engine before not experimental state or experiment, move the frame and keep the fixed state with the fixed frame, prolonged the life of engine thrust measurement rack, avoid simultaneously exerting irreversible external force and causing the damage even to the spring leaf when moving the frame and installing engine under self-contained state (not using lock state) and relevant testpieces, guaranteed the precision of engine thrust measurement rack.

7. The utility model discloses a contain in the thrust measurement rack of engine installation gallows, adopt standard force transducer to carry out the error determination of working force transducer to the working force transducer, static calibration, the known "simulation thrust" that produces a set of high accuracy from this carries out the degree of deciding to force measuring system, because it has reappeared the deformation and the atress condition of test condition, eliminated because the most system error that deformation, installation, temperature, restraint etc. that produce when experimental arouse to the thrust measurement uncertainty has been reduced.

8. The utility model discloses a contain in the thrust measurement rack of engine installation gallows, draw the characteristic curve graph of standard force sensor and working force sensor through demarcating, pass through the true value of the accurate definite force of characteristic curve graph with the power value of working force sensor output, avoided the calibration of at every turn experimental to the working force sensor, with low costs, efficient.

A method of measuring thrust of a subject engine using the engine thrust measurement rig, comprising the steps of:

s100), installing the engine 1 under test and measuring the pipe section 401

S110), sequentially enabling a measuring section for measuring engine air inlet parameters to pass through the first measuring section bracket 410 and the second measuring section bracket 420, and placing the measuring section in the first measuring section bracket 410 and the second measuring section bracket 420;

s120), mounting the front joint 640 and the rear joint 650 to the longitudinal beam 613 according to the suspension position of the engine 1 under test;

s130), mounting the engine mounting frame 600 on the movable frame body 210, and then mounting the tested engine 1 on the front joint 640 and the rear joint 650;

s140) adjusting the measuring pipe section 401, connecting one end of the measuring pipe section 401 with the air inlet of the tested engine 1, adjusting the positioning mechanism screw 4143 in the measuring section bracket positioning mechanism 414, enabling the measuring pipe section 401 to be coaxial with the air inlet of the tested engine 1, and then sequentially rotating the positioning mechanism locking nut 4142 and the positioning mechanism nut 4141 in the measuring section bracket positioning mechanism 414.

S200), disassembling and locking device

The fastening nut 530 is loosened, the fastening screw 510 is pulled out from the vertical plate of the rear mounting seat 160, the fastening baffle 520 and the baffle at the rear end of the movable frame body 210 in sequence, and then the fastening baffle 520 is taken out.

S300), determining the error of the working force sensor

S310), the industrial personal computer controls the servo motor to start to drive the hydraulic loading device to work, the hydraulic loading device drives the calibration oil cylinder to work, a piston of the calibration oil cylinder drives the standard force sensor 340 to displace so as to drive the movable frame body 210 to displace, and force is applied to the working force sensor 350 in the displacement process of the movable frame body 210;

s320), the hydraulic loading device drives the calibration oil cylinder to work, and the loading force is unloaded to a zero value after the loading force is continuously applied to the standard force sensor 340 to a preset value; the standard force sensor data acquisition device and the working force sensor data acquisition device respectively acquire force values output by the standard force sensor 340 and the working force sensor 350 in the loading force applying and unloading processes and feed back the force values to the industrial personal computer, and the display displays the force values output by the standard force sensor 340 and the working force sensor 350 in the loading force applying and unloading processes, which are acquired by the standard force sensor data acquisition device and the working force sensor data acquisition device;

s330), drawing characteristic curve graphs of the standard force sensor 340 and the working force sensor 350 according to force values output by the standard force sensor 340 and the working force sensor 350 in the process of applying loading force and unloading loading force, wherein the force values are displayed by a display and acquired by the standard force sensor data acquisition device and the working force sensor data acquisition device; under the same loading force, the difference between the force value output by the working force sensor 350 acquired by the working force sensor data acquisition device and the force value output by the standard force sensor 340 acquired by the standard force sensor data acquisition device is the working force sensor error.

S400), measuring the thrust of the tested engine 1

The tested engine 1 is ignited, after the temperature and the total pressure of the tested engine detected by the temperature sensor and the pressure sensor in the measuring pipe section 401 reach working conditions, the display displays the force value output by the working force sensor 350 and collected by the working force sensor data collecting device.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The engine test bed thrust measurement hanging bracket is characterized by comprising a front beam, a rear beam and a longitudinal beam, wherein the front beam and the rear beam are arranged in parallel and are fixedly connected with the longitudinal beam; the longitudinal beam is provided with mounting holes for mounting the front joint and the rear joint.

2. The engine test stand thrust measurement pylon of claim 1 wherein: the front joint and the rear joint are detachably mounted in the mounting hole.

3. An engine test bed thrust measurement mounting frame comprising the engine test bed thrust measurement hanging bracket of claim 1 or 2, which is characterized by comprising a left upright column and a right upright column which have the same structure, wherein the bottom surfaces of the left upright column and the right upright column are detachably connected with a movable frame; the engine mounting hanger is fixedly connected with the top surfaces of the left upright post and the right upright post to form a gantry type.