CN119619663A

CN119619663A - A test device for frequency converter

Info

Publication number: CN119619663A
Application number: CN202411748190.5A
Authority: CN
Inventors: 王猛
Original assignee: Suzhou Suming Automation Equipment Co ltd
Current assignee: Suzhou Suming Automation Equipment Co ltd
Priority date: 2024-12-02
Filing date: 2024-12-02
Publication date: 2025-03-14

Abstract

The invention discloses a testing device for a frequency converter, and relates to the technical field of frequency converter testing devices; the invention comprises a box and a detection device, the detection device is installed on the outside of the box, an adjustment mechanism is installed on the inner wall of the box, the adjustment mechanism comprises a lifting frame, a detection mechanism is installed at the bottom of the lifting frame, a positioning mechanism is installed at the bottom of the box, the positioning mechanism comprises a positioning plate, and the positioning plate is rotatably installed in the box; in the invention, by arranging the adjustment mechanism and the detection mechanism, the frequency converter can be automatically detected in all directions, and the frequency converter can be positioned and adjusted by the positioning mechanism, so that the frequency converter can be turned over, so that the terminals of the frequency converter can be turned over, so that two probes can perform all-round contact detection with the terminals of the frequency converter, and in the invention, by arranging a moving frame, a lifting frame, a mounting ring and two probes to cooperate with each other, the height and position of the probes can be adjusted.

Description

Testing device for frequency converter

Technical Field

The invention relates to the technical field of frequency converter testing devices, in particular to a testing device for a frequency converter.

Background

The frequency converter is an electronic device for regulating the frequency and voltage of an alternating current power supply, and is mainly used for controlling the rotating speed and torque of a motor. The motor control device can realize accurate control of the motor by adjusting the output frequency, improve the energy efficiency and prolong the service life of the equipment. During the use of the frequency converter, testing is critical to ensure stability and reliability of its performance, to detect electrical parameters (e.g., voltage, current, frequency), to evaluate the efficiency and effectiveness of the system, and to help identify potential faults, thereby optimizing equipment operation and maintenance strategies. The universal meter is generally used for detecting the frequency converter, and the universal meter is mainly used for detecting the frequency converter and mainly comprises the step of measuring electrical parameters such as direct current voltage, alternating current, frequency and the like. By detecting the voltage of the direct current bus, whether the power supply of the frequency converter is normal or not can be confirmed, the measurement of the alternating current voltage and the alternating current helps to evaluate the output performance and the motor load condition, and the frequency measurement ensures that the output frequency accords with a set value for detection.

However, the existing detection is usually performed manually, the efficiency of manual detection is low, thus the production efficiency is reduced, and the accuracy of manual detection is low.

Disclosure of Invention

The invention aims to solve the problems of low manual detection efficiency and poor effect, and provides a testing device for a frequency converter.

In order to solve the technical problems, the testing device for the frequency converter comprises a box body and detection equipment, wherein the detection equipment is arranged on the outer side of the box body, an adjusting mechanism is arranged on the inner wall of the box body and comprises a lifting frame, the bottom end of the lifting frame is provided with the detection mechanism, the bottom end of the box body is provided with a positioning mechanism, the positioning mechanism comprises a positioning disc, and the positioning disc is rotatably arranged in the box body.

Preferably, the auxiliary rods are fixedly arranged on two sides of the inner wall of the box body, the moving blocks are movably sleeved on two sides of the auxiliary rods, a moving frame is fixedly connected to one side, opposite to the moving blocks, of each moving frame, a first adjusting groove is formed in each moving frame, a rotating shaft is rotatably inserted into the top end of the box body, a swinging plate is arranged at the bottom end of each rotating shaft, a fixing rod is fixedly arranged at the bottom end of each swinging plate in a fixed mode, the fixing rods are movably inserted into the first adjusting grooves, a first transmission rod is rotatably arranged at the top end of the box body, a second gear is fixedly arranged on the outer side of each rotating shaft, a first gear is fixedly sleeved with a first gear, the first gear is meshed with the second gear, a second transmission rod is rotatably arranged on the outer side of the box body, one side, opposite to the second transmission rod, of each moving block is fixedly connected with a transverse plate through a synchronous wheel and a synchronous belt, the inner wall of each transverse plate is fixedly arranged on the electric cylinder, the output end of each electric cylinder is alternately arranged in the transverse plate and fixedly connected with the lifting frame, the transverse plate is fixedly arranged at the top end of the lifting frame, and the movable limiting rod is alternately arranged in the transverse plate.

Preferably, the inner wall of the lifting frame is rotationally provided with two unidirectional screw rods, a first thread slider is sleeved on the outer side of the unidirectional screw rods, an adjusting plate is fixedly arranged at the bottom end of the first thread slider, a probe is installed at the outer side of the adjusting plate, two second motors are installed at the outer side of the lifting frame, two output ends of the second motors penetrate through and are arranged in the lifting frame and are fixedly connected with the unidirectional screw rods, the adjusting plate is provided with a mounting plate, bolts are fixedly arranged at the top ends of the mounting plate, second adjusting grooves are formed in the adjusting plate, the bolts penetrate through and are arranged in the second adjusting grooves, hexagonal nuts are sleeved on the outer side of the bolts, a positioning ring is fixedly arranged on the outer side of the mounting plate, the probe is inserted into the positioning ring, a threaded rod is inserted into the positioning ring, an extrusion block is fixedly arranged at the end part of the threaded rod, and one end, far away from the extrusion block, of the threaded rod is fixedly provided with a rotary table.

Preferably, positioning disk bottom mounting is equipped with the mount, the rotation is equipped with two-way lead screw in the mount, two-way lead screw outside thread bush is equipped with No. two thread slider, no. two thread slider top is fixed to be equipped with the grip block, two the cushion has been set firmly to one side that the grip block is relative, two slipmats are installed on the positioning disk top, the sliding tray has been seted up in the positioning disk, the grip block activity is inserted and is established in the sliding tray, no. three motors are installed in the mount outside, no. three motor output runs through and alternates and establish in the mount and with two-way lead screw fixed connection, box bottom mounting is equipped with L template, L template is connected with the box rotation dwang with the box, the dwang passes through synchronizing wheel and hold-in range with No. two drive rods and passes through synchronizing wheel and hold-in range transmission connection, the fixed No. three gears that are equipped with in the dwang outside, the positioning disk bottom is fixed to be equipped with the ring gear, no. three gears and ring intermeshing, no. four motors are installed to the L bottom, no. four motor output runs through and establishes in the mount and is with L template fixed connection with the square-shaped plate, the side is equipped with the outer side of box fixed mounting, the side of the box is equipped with the array is connected with the apron.

Compared with the prior art, the invention has the beneficial effects that:

1. According to the invention, the adjusting mechanism and the detecting mechanism are arranged, so that the frequency converter can be automatically detected in all directions, and meanwhile, the frequency converter can be positioned and adjusted through the positioning mechanism, so that the frequency converter can be overturned, the terminal of the frequency converter can be overturned, and the two probes can be used for detecting contact with the terminal of the frequency converter in all directions;

2. According to the invention, the moving frame, the lifting frame and the mounting ring are arranged to be matched with the two probes, so that the height and the position of the probes can be adjusted, the position of one probe can be adjusted to be respectively in contact with three terminals RST or UVW in the detection process, and the other probe can be in contact with DC-or DC+, so that the purpose of automatic adjustment and detection is achieved;

3. according to the invention, the positioning disc, the bidirectional screw rod, the second threaded sliding block, the toothed ring, the third gear and other structures are matched with each other, so that the frequency converter can be installed and positioned, and meanwhile, the frequency converter can be turned over, so that two probes can be respectively contacted with DC-and DC+, and the other probe can be respectively contacted with three ends of the responsive RST and UVW for testing, and the purpose of automatic detection is achieved.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is an enlarged schematic view of the structure of FIG. 1A according to the present invention;

FIG. 3 is a schematic side view of the overall structure of the present invention;

FIG. 4 is an enlarged schematic view of the structure of FIG. 3B according to the present invention;

FIG. 5 is a schematic cross-sectional view of the case and its connection structure according to the present invention;

FIG. 6 is an enlarged schematic view of the structure of FIG. 5C according to the present invention;

FIG. 7 is a schematic cross-sectional view of a lifting frame and its connection structure according to the present invention;

FIG. 8 is an enlarged schematic view of the structure of FIG. 7D according to the present invention;

FIG. 9 is a schematic view of a movable frame and its connection structure according to the present invention;

Fig. 10 is a schematic diagram of a frequency converter according to the present invention.

The device comprises a box body 1, a detection device 110, a cover plate 111, a viewing window 113, a supporting leg 2, an adjusting mechanism 201, an auxiliary rod 202, a moving block 203, a moving frame 204, a first adjusting groove 205, a transverse plate 210, a rotating shaft 211, a swinging plate 212, a fixed rod 213, a first transmission rod 214, a first gear 215, a second gear 216, a second transmission rod 220, an electric cylinder 221, a lifting frame 222, a limiting rod 3, a detecting mechanism 301, a unidirectional screw rod 302, a first threaded slider 303, an adjusting plate 304, a mounting plate 305, a locating ring 306, a probe 307, a second motor 310, a second adjusting groove 311, a bolt 312, a hexagonal nut 313, a second threaded slider 314, a pressing block 315, a turntable 4, a locating mechanism 401, a locating plate 402, a fixed frame 403, a bidirectional screw rod 404, a second threaded slider 405, a sliding groove 406, a clamping plate 407, a motor 408, a third motor, a fourth motor 409, a fourth motor, a fourth threaded rod 412, a fourth threaded rod 410, a fourth threaded pad 413 and a third threaded rod 413.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1-10, the invention provides a testing device for a frequency converter, which comprises a box body 1 and a detection device 110, wherein the detection device 110 is arranged outside the box body 1, the detection device 110 comprises a universal meter and analysis equipment, an adjusting mechanism 2 is arranged on the inner wall of the box body 1, the adjusting mechanism 2 can adjust the position of a probe 306, the adjusting mechanism 2 comprises a lifting frame 221, the lifting frame 221 can adjust the height, a detection mechanism 3 is arranged at the bottom end of the lifting frame 221, a positioning mechanism 4 is arranged at the bottom end of the box body 1, the positioning mechanism 4 comprises a positioning disc 401, and the positioning disc 401 is rotatably arranged in the box body 1, so that the positioning disc 401 can drive the frequency converter to turn over, and the two probes 306 can alternately detect.

Auxiliary rods 201 are fixedly arranged on two sides of the inner wall of the box body 1, moving blocks 202 are movably sleeved on the outer sides of the two auxiliary rods 201, a moving frame 203 is fixedly connected to one side, opposite to the moving blocks 202, of each moving frame 203, and a first adjusting groove 204 is formed in each moving frame 203.

By adopting the technical scheme, the movable frame 203 can slide on the inner wall of the box body 1.

The box 1 top rotates and inserts and is equipped with pivot 210, pivot 210 bottom mounting is equipped with swing plate 211, swing plate 211 bottom mounting is equipped with dead lever 212, dead lever 212 activity is inserted and is established in No. one adjustment tank 204, box 1 top rotates and is equipped with No. one transfer line 213, the pivot 210 outside has set firmly No. two gears 215, no. one fixed cover in No. one transfer line 213 outside is equipped with No. one gear 214, no. one gear 214 and No. two gears 215 intermeshing, box 1 outside rotates and is equipped with No. two transfer lines 216, no. one transfer line 213 passes through the synchronizing wheel with No. two transfer lines 216 and is connected with the hold-in range transmission.

By adopting the technical scheme, the second transmission rod 216 is driven to drive the movable frame 203 to move.

Two the movable blocks 202 are fixed on opposite sides and are fixedly connected with a transverse plate 205, an inner wall of the transverse plate 205 is fixedly provided with an electric cylinder 220, an output end of the electric cylinder 220 is penetrated and arranged in the transverse plate 205 and is fixedly connected with a lifting frame 221, a limiting rod 222 is fixedly arranged at the top end of the lifting frame 221, the limiting rod 222 can assist the lifting frame 221 to move up and down, and the limiting rod 222 is movably penetrated and arranged in the transverse plate 205.

By adopting the technical scheme, the output end of the electric cylinder 220 drives the lifting frame 221 to move downwards.

The inner wall of the lifting frame 221 is rotatably provided with two unidirectional screw rods 301, a first thread slide block 302 is sleeved on the outer side of the unidirectional screw rods 301, an adjusting plate 303 is fixedly arranged at the bottom end of the first thread slide block 302, a probe 306 is mounted on the outer side of the adjusting plate 303, the probe 306 is connected with the detection equipment 110 through a circuit, two second motors 307 are mounted on the outer side of the lifting frame 221, and the output ends of the two second motors 307 are penetrated in the lifting frame 221 in a penetrating mode and fixedly connected with the unidirectional screw rods 301.

By adopting the technical scheme, the output end of the second motor 307 rotates to drive the adjusting plate 303 to transversely move, so that the two probes 306 can independently move.

The mounting plate 304 is installed to the regulating plate 303, the fixed bolt 311 that is equipped with in mounting plate 304 top, no. two adjustment grooves 310 have been seted up in the regulating plate 303, the bolt 311 is run through and is established in No. two adjustment grooves 310, the screw thread cover in the bolt 311 outside is equipped with hexagon nut 312.

Through adopting above-mentioned technical scheme for the position of mounting panel 304 is adjusted, thereby can adjust according to DC-and DC+, the vertical distance between RST and the UVW, thereby conveniently detect.

The positioning ring 305 is fixedly arranged on the outer side of the mounting plate 304, the probes 306 are inserted into the positioning ring 305, the two probes 306 are respectively a red probe 306 and a black probe 306, and the electric parameters such as direct-current voltage, alternating-current and frequency of the frequency converter can be tested, so that the purpose of detection is achieved, a threaded rod 313 is inserted into the positioning ring 305, the end part of the threaded rod 313 is fixedly provided with a squeezing block 314, and one end of the threaded rod 313 far away from the squeezing block 314 is fixedly provided with a rotary table 315.

By adopting the above technical scheme, the rotation of the turntable 315 drives the extrusion block 314 to move, so that the probe 306 can be positioned and installed, and the probe 306 is connected with the detection device 110 through lines.

The fixed mount 402 that is equipped with in positioning disk 401 bottom mounting, the mount 402 rotation is equipped with two-way lead screw 403, two-way lead screw 403 outside thread bush is equipped with No. two screw thread slider 404, no. two screw thread slider 404 top is fixed and is equipped with grip block 406.

By adopting the technical scheme, the clamping plate 406 can clamp the frequency converter.

Two opposite sides of the clamping plates 406 are fixedly provided with soft cushions 407, two anti-slip pads 409 are arranged at the top ends of the positioning plates 401, sliding grooves 405 are formed in the positioning plates 401, the clamping plates 406 are movably inserted into the sliding grooves 405, a motor number three 408 is arranged on the outer side of the fixing frame 402, and the output end of the motor number three 408 is inserted into the fixing frame 402 in a penetrating manner and is fixedly connected with the bidirectional screw rod 403.

By adopting the technical scheme, the output end of the third motor 408 drives the bidirectional screw 403 to rotate.

An L-shaped plate 410 is fixedly arranged at the bottom end of the box body 1, the L-shaped plate 410 and the box body 1 are rotationally connected with a rotating rod 411, the rotating rod 411 is in transmission connection with a synchronous belt through a synchronous wheel and a synchronous belt and a second transmission rod 216 through a synchronous wheel, a third gear 412 is fixedly arranged at the outer side of the rotating rod 411, a toothed ring 413 is fixedly arranged at the bottom end of the positioning disc 401, the third gear 412 is meshed with the toothed ring 413, the fourth motor 414 is installed at the bottom end of the L-shaped plate 410, the output end of the fourth motor 414 is inserted in the L-shaped plate 410 in a penetrating manner and is fixedly connected with the rotating rod 411, the cover plate 111 is rotatably arranged on the outer side of the box body 1, the observation window 112 is installed in the cover plate 111, and the supporting legs 113 distributed in a rectangular array are fixedly arranged at the bottom end of the box body 1.

By adopting the technical scheme, the output end of the fourth motor 414 rotates to drive the positioning disk 401 to rotate, so that the frequency converter can be overturned.

Working principle: firstly, the frequency converter is placed above the positioning disk 401, at this time, the motor No. three 408 is started, so that the motor No. three 408 starts to work, the output end of the motor No. three 408 rotates to drive the bi-directional screw rod 403 to rotate, the bi-directional screw rod 403 rotates to drive the two threaded sliders 404 to move in opposite directions, the movement of the threaded sliders 404 drives the clamping plate 406 to move in opposite directions under the action of the sliding groove 405, the clamping plate 406 moves to clamp the frequency converter, then the motor No. four 414 is started, so that the output end of the motor No. four 414 rotates to drive the rotating rod 411 to rotate, the rotating rod 411 rotates to drive the driving rod No. two 216 to rotate through the synchronous wheel and the synchronous belt, the driving rod No. two 216 rotates to drive the driving rod 213 to rotate through the synchronous wheel and the synchronous belt, the driving rod No. one 213 rotates to drive the gear 214 to rotate, the gear No. two gears 215 meshed with each other, the rotation of the second gear 215 causes the rotation shaft 210 to rotate, the rotation shaft 210 rotates to drive the swinging plate 211 to swing, the swinging plate 211 swings to drive the movable frame 203 to transversely move under the assistance of the first adjusting groove 204 through the fixed rod 212, so that the two probes 306 can be driven to move, the probes 306 move to a proper position, then the electric cylinder 220 is started to enable the electric cylinder 220 to start working, the output end of the electric cylinder 220 drives the lifting frame 221 to downwards move under the assistance of the limiting rod 222, the lifting frame 221 downwards moves to drive the probes 306 to downwards move, the second motor 307 can be started simultaneously, the second motor 307 starts to work, the output end of the second motor 307 rotates to drive the unidirectional screw 301 to rotate, the unidirectional screw 301 rotates to drive the first threaded slider 302 to move, the first threaded slider 302 moves to drive the probes 306 to move, firstly, the red probe 306 is moved to the position above DC-, then the black probe 306 is respectively contacted with UVW, the data are detected by the detection equipment 110, the detection equipment 110 comprises a universal meter, the universal meter is connected with the black probe 306 and the red probe 306 through a circuit, and the direct current voltage of a frequency converter, the voltage of the voltage converter and the voltage of the voltage converter can be measured, Electrical parameters such as ac voltage, ac current, and frequency. The frequency measurement ensures that the output frequency accords with a set value, so that the data of the frequency converter can be detected, after the detection is finished, the rotating rod 411 rotates and drives the gear III 412 to rotate, the gear III 412 rotates and drives the meshed toothed ring 413 to rotate, the toothed ring 413 rotates and drives the positioning disc 401 to rotate, the positioning disc 401 rotates and can drive the frequency converter to rotate, meanwhile, when the toothed ring 413 rotates for half a circle, the rotating shaft 210 rotates for half a circle, and then the probe 306 is moved to DC-and DC +, the speed of the motor is increased, RST and UVW top makes black probe 306 and RST contact in proper order this moment, and red probe 306 and DC+ contact simultaneously to can carry out the purpose of all-round detection to the converter.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A testing device for a frequency converter comprises a box body (1) and detection equipment (110) and is characterized in that the detection equipment (110) is arranged on the outer side of the box body (1), an adjusting mechanism (2) is arranged on the inner wall of the box body (1), the adjusting mechanism (2) comprises a lifting frame (221), a detection mechanism (3) is arranged at the bottom end of the lifting frame (221), a positioning mechanism (4) is arranged at the bottom end of the box body (1), the positioning mechanism (4) comprises a positioning disc (401), and the positioning disc (401) is rotatably arranged in the box body (1).

2. The testing device for the frequency converter of claim 1, wherein auxiliary rods (201) are fixedly arranged on two sides of the inner wall of the box body (1), moving blocks (202) are movably sleeved on the outer sides of the two auxiliary rods (201), a moving frame (203) is fixedly connected to one side, opposite to the moving blocks (202), of each moving frame, and a first adjusting groove (204) is formed in each moving frame (203).

3. A testing device for a frequency converter is characterized in that a rotating shaft (210) is rotatably inserted into the top end of a box body (1), a swinging plate (211) is fixedly arranged at the bottom end of the rotating shaft (210), a fixing rod (212) is fixedly arranged at the bottom end of the swinging plate (211), the fixing rod (212) is movably inserted into a first adjusting groove (204), a first motor (213) is mounted at the top end of the box body (1), a first transmission rod (213) is rotatably arranged at the top end of the box body (1), a second gear (215) is fixedly arranged on the outer side of the rotating shaft (210), a first gear (214) is fixedly sleeved on the outer side of the first transmission rod (213), the first gear (215) is meshed with the second gear (215), a second transmission rod (216) is rotatably arranged on the outer side of the box body (1), and the first transmission rod (213) is in transmission connection with a synchronous belt through a synchronous wheel.

4. A testing device for a frequency converter is characterized in that one side, opposite to two moving blocks (202), of each moving block is fixedly connected with a transverse plate (205), the inner wall of each transverse plate (205) is fixedly shot on an electric cylinder (220), the output end of each electric cylinder (220) is inserted into each transverse plate (205) and fixedly connected with a lifting frame (221), the top end of each lifting frame (221) is fixedly provided with a limiting rod (222), and each limiting rod (222) is movably inserted into each transverse plate (205).

5. The testing device for the frequency converter of claim 1, wherein two unidirectional screw rods (301) are rotatably arranged on the inner wall of the lifting frame (221), a first threaded sliding block (302) is sleeved on the outer side of each unidirectional screw rod (301), an adjusting plate (303) is fixedly arranged at the bottom end of each first threaded sliding block (302), a probe (306) is arranged on the outer side of each adjusting plate (303), two second motors (307) are arranged on the outer side of the lifting frame (221), and the output ends of the two second motors (307) are penetrated in the lifting frame (221) in a penetrating mode and are fixedly connected with the unidirectional screw rods (301).

6. The testing device for the frequency converter of claim 5, wherein the adjusting plate (303) is provided with a mounting plate (304), a bolt (311) is fixedly arranged at the top end of the mounting plate (304), a second adjusting groove (310) is formed in the adjusting plate (303), the bolt (311) is inserted into the second adjusting groove (310), and a hexagonal nut (312) is sleeved on the outer side of the bolt (311).

7. A test device for a frequency converter according to claim 6, wherein a positioning ring (305) is fixedly arranged on the outer side of the mounting plate (304), the probe (306) is inserted into the positioning ring (305), a threaded rod (313) is inserted into the positioning ring (305) in a threaded manner, a squeezing block (314) is fixedly arranged at the end of the threaded rod (313), and a rotary table (315) is fixedly arranged at one end, far away from the squeezing block (314), of the threaded rod (313).

8. A testing device for a frequency converter is characterized in that a fixing frame (402) is fixedly arranged at the bottom end of a positioning disc (401), a bidirectional screw rod (403) is rotatably arranged in the fixing frame (402), a second threaded slider (404) is sleeved on the outer side of the bidirectional screw rod (403), and a clamping plate (406) is fixedly arranged at the top end of the second threaded slider (404).

9. The testing device for the frequency converter of claim 8, wherein two soft cushions (407) are fixedly arranged on one opposite sides of the clamping plates (406), two anti-slip pads (409) are arranged at the top ends of the positioning plates (401), sliding grooves (405) are formed in the positioning plates (401), the clamping plates (406) are movably inserted into the sliding grooves (405), a motor III (408) is arranged on the outer side of the fixing frame (402), and the output ends of the motor III (408) are inserted into the fixing frame (402) in a penetrating manner and are fixedly connected with the bidirectional screw rod (403).

10. The testing arrangement for converter of claim 9, wherein box (1) bottom mounting is equipped with L template (410), L template (410) are connected with rotation pole (411) with box (1) rotation, rotation pole (411) are connected through synchronizing wheel and hold-in range transmission through synchronizing wheel and hold-in range transmission pole (216), fixed No. three gear (412) that is equipped with in the outside of rotation pole (411), positioning disk (401) bottom mounting is equipped with ring gear (413), no. three gear (412) and ring gear (413) intermeshing, no. four motor (414) are installed to L template (410) bottom, no. four motor (414) output is run through and are established in L template (410) and with rotation pole (411) fixed connection, box (1) outside rotation is equipped with apron (111), install viewing window (112) in apron (111), box (1) bottom mounting is equipped with support leg (113) that are rectangle array distribution.