CN105598534A - On-machine detection device and detection method of worm gear pair transmission precision - Google Patents

Abstract

The invention discloses a clinical detection device for transmission precision of a worm gear pair, which comprises a turntable for installing a worm wheel and a tooling for installing a worm screw, a worm wheel angular displacement sensor for detecting the rotation angle of the worm wheel is installed in the turntable, and a worm screw for detecting the rotation angle of the worm wheel is installed on the tooling The angular displacement sensor, the worm gear angular displacement sensor and the output of the worm angular displacement sensor are connected with a worm gear detector. The tooling has a bracket, a slide plate located above the bracket and a pair of dead ends for supporting both ends of the worm. The bracket is provided with a drive motor. The drive motor drives a gear transmission group. The rotor of the worm angular displacement sensor is coaxial with the end gear and rotates synchronously to measure the rotation angle of the worm. The turntable includes a mounting platform and a base that can rotate relatively. On the boss of the platform, the stator is connected and fixed with the base. The invention also discloses a clinical detection method for the transmission accuracy of the worm gear pair. The invention solves the clinical detection problem of the transmission accuracy of the worm gear pair.

Description

A clinical testing device and testing method for worm gear transmission accuracy

technical field

The invention relates to the field of detection of worm gear pairs, in particular to a clinical detection device and detection method for transmission precision of worm gear pairs.

Background technique

The current general procedure for worm gear pair processing is: process the worm gear on the worm gear processing machine tool (hobbing machine), process the worm gear on the worm grinder, and then match the worm gear and the worm gear on the special worm gear inspector to grind the contact surface, and test the transmission accuracy and pitch difference etc. Such as CN102435432A disclosed worm gear meshing instrument, which utilizes a second-hand gear hobbing machine to realize the worm gear and worm gear meshing instrument for detecting the meshing condition of a large worm wheel and a worm screw. It includes a second-hand gear hobbing machine, and the worm tooling is installed on the large flange of the second-hand gear hobbing machine. and positioned with the axis. Although this technical solution can realize the meshing condition inspection of large worm gear and worm screw, the cost of equipment is high, and it is difficult for small and medium-sized enterprises to purchase, which is not conducive to popularization.

For this reason, CN103213032A discloses a high-precision comprehensive inspection instrument for worm gear pair meshing, which is to install two longitudinal horizontal linear guide rails on the worktable, and the assembly base is slidably connected to the horizontal linear guide rails and connected with a horizontal ball screw , the detection equipment assembly is composed of a worm tooling beam and a worm tooling, and a turbine base is installed on the horizontal linear guide rail, and a feeler gauge and a dial indicator are connected to the turbine base. The inspection instrument can not only accurately detect the center distance of the worm gear pair, the condition of the meshing surface and the backlash deviation of the worm gear, but also solve the problem that the traditional inspection instrument cannot detect the meshing of the worm gear pair with a large center distance and the detection steps are very cumbersome.

However, in the instruments disclosed in the above patent documents, the huge worm wheel needs to be repeatedly transported, installed, and calibrated during the detection process, which is not only very troublesome, but especially affects the final overall accuracy. And the overall accuracy of the worm gear pair should also include the transmission accuracy of the worm gear pair. However, in CN103213032A, the worm is directly driven to rotate by shaking the hand wheel or the motor, and the worm and the worm gear are meshed for transmission, and there is no detection process of transmission accuracy. These imperfect detection methods make the production accuracy of worm gear pairs in my country generally only below the fifth-grade accuracy of the national standard GB10089-88 for worm gear pairs, which seriously affects the improvement of the overall level of accuracy of worm gear pairs in my country and restricts the improvement of the accuracy of worm gear pairs in my country. develop.

Contents of the invention

The purpose of the present invention is to provide a clinical detection device and detection method for the transmission precision of a worm gear pair, which can solve the installation error problem caused by multiple installations in the worm gear detection process.

Technical scheme of the present invention is as follows:

A clinical testing device for transmission accuracy of worm gear pairs, including a turntable for installing a worm wheel and a tooling for installing a worm, a worm wheel angular displacement sensor for detecting the rotation angle of the worm wheel is installed in the turntable, and a worm angle sensor for detecting the rotation angle of the worm is installed on the tooling The displacement sensor, the angular displacement sensor of the worm gear and the output of the angular displacement sensor of the worm gear are connected with a worm gear detector, and the tangential displacement between the turntable and the tooling can make the worm gear mesh with the worm gear. The tooling has a bracket, a slide plate located above the bracket, and a pair of dead centers for supporting both ends of the worm, wherein one dead center is fixed on the bracket, and the other dead center is fixed on the spindle motor drag seat of the machine tool, and the slide plate can slide To adjust the distance between the two dead tops; the bracket is provided with a drive motor, the drive motor drives a gear transmission group, and the end gear of the gear transmission group is fixed with a lever assembly, which drives the worm to rotate and makes the worm and the end gear Coaxial and synchronous rotation, the stator of the worm angular displacement sensor is fixed on the bracket, the rotor of the worm angular displacement sensor is coaxial with the end gear, and rotates synchronously to measure the rotation angle of the worm; the turntable includes a relatively rotatable mounting table and The base, the mounting table is used to connect the worm gear and is connected to the base, the center of the mounting table has a downward protruding post, the protruding post is coaxial with the mounting table and the base, and the rotor of the angular displacement sensor is coaxially installed on the protruding post , the stator of the angular displacement sensor is connected and fixed to the base; a centripetal thrust bearing is also installed on the boss between the installation platform and the base, and the centripetal thrust bearing supports the installation platform and maintains the coaxiality between the installation platform and the base.

Further, the gear transmission group includes a starting gear connected to the drive motor, the starting gear meshes directly with the terminal gear, the central hole of the terminal gear is installed on the mounting cylinder protruding from the side wall of the bracket through a bearing, and the worm The rotor of the angular displacement sensor is fixed on the installation cylinder through another bearing; the lever assembly includes a second lever fixed vertically on the end face of the end gear and a first lever fixed vertically to the second lever at one end, the first lever The other end of the rod is covered with a ring sleeve, and the ring sleeve is inserted and fixed in the rod portion of the worm.

Further, the base is a cavity structure with an open lower end and a central hole at the upper end, the lower end of the boss passes through the center hole and is located in the cavity of the base, and the rotor of the worm gear angular displacement sensor is installed and fixed on the lower end of the boss And the stator is fixedly connected to the bottom surface of the upper end of the base; the groove is located on the outside of the centripetal thrust bearing; the upper end surface of the base is evenly distributed with several grooves around its central axis, these grooves are distributed in a circle, and the grooves are provided with north and south poles and The axial direction of the turntable is the same as the magnet, and the length of the magnet is greater than the distance between the lower bottom surface of the mounting table and the upper end surface of the base.

Further, the installation platform is provided with three through holes penetrating up and down, the three through holes are evenly distributed on a circle whose center is located on the central axis of the installation platform, the upper end of the through hole is a counterbore, and the upper end surface of the base is set There is a threaded hole corresponding to the through hole, and a pin is detachably installed in the through hole and the threaded hole. The pin can fix the mounting table to the base. When the pin is removed, the mounting table can rotate freely relative to the base.

Further, the lower end of the base has an arc-shaped step radially facing outside the cavity, six U-shaped grooves for connecting the machine tool table are evenly distributed on the edge of the arc-shaped step, and the U-shaped grooves open outward.

Further, the upper end surface of the mounting table is provided with twelve threaded mounting holes, these threaded mounting holes are evenly distributed on a circle whose center is located on the central axis of the mounting table, the threaded mounting holes are located inside the through hole, and the threaded holes are used for Fix the worm gear or the mold of the worm gear to the mounting table.

Further, the bracket is a tool post bracket of a machine tool, and the slide plate is a tool post slide plate of a machine tool.

Further, both the worm gear angular displacement sensor and the worm angular displacement sensor have built-in couplings.

The present invention also discloses a clinical detection method for the transmission accuracy of the worm gear pair, which includes the following steps:

① Install the turntable on the machine tool workbench before machining the worm gear on the machine tool, and fix the base of the turntable on the machine tool workbench through its U-shaped groove bolts, so that the turntable base and the machine tool workbench can rotate concentrically and synchronously.

②Install the pins to fix the mounting table and the base of the turntable together.

③Install the mold on the mounting table of the turntable so that the mold and the mounting table are integrated, adjust the height of the center of the worm wheel through the mold, install the worm gear to be processed into the mold and adjust it to rotate concentrically with the turntable.

④ After the worm gear is finished, remove the tool, replace the worm tooling, install the upper dead center on the spindle motor bracket, adjust the distance between the drag base and the spindle motor bracket to install the worm, and then install the first lever.

⑤Remove the pin between the mounting table and the base of the turntable, so that the mounting table can rotate freely relative to the base.

⑥Move the slide plate of the tool holder and adjust the position of the machine tool table so that the worm gear pair is in the best meshing position.

⑦Start the driving motor of the worm tooling, the lever assembly drives the worm to rotate, adjust the friction between the mounting table and the base of the turntable by dialing the number of magnets, so that the worm can drive the worm wheel and the mounting table to rotate smoothly.

⑧Detect the transmission accuracy of the worm gear pair through the angular displacement sensor of the turntable and the angular displacement sensor of the worm.

⑨Based on the detected transmission accuracy, if the worm gear needs to be further processed and corrected, remove the worm and the worm tooling, fix the mounting table and the base of the turntable with pins, and then adjust the machine parameters according to the transmission accuracy to process the worm gear pair Correction; if the accuracy meets the requirements, the machining of the worm gear is completed.

The worm tooling of the clinical testing device for the transmission accuracy of the worm gear pair in the present invention solves the installation structure of the worm in the transmission accuracy detection of the worm gear pair well. It supports the worm through a pair of dead ends, so as to avoid the support structure from being separated from the worm during the rotation of the worm. The frictional force between the worms becomes the resistance to the rotation of the worms. A low-speed controllable torque is also provided to the worm in the form of a motor-driven gear set. And by measuring the rotation angle of the terminal gear through the angle sensor, it is convenient to measure the rotation angle of the worm, and it is convenient to measure the rotation angle of the worm. The turntable of the worm gear transmission accuracy clinical detection device in the present invention enables the worm wheel to rotate arbitrarily under the drive of the worm, and the central shaft of the revolution remains unchanged due to the effect of the centripetal thrust bearing; and the installation of the centripetal thrust bearing to the worm wheel The platform has a supporting function, and because the rolling friction of the end surface of the bearing is very small, it can ensure the rotation accuracy and flexibility of the worm gear and the installation platform.

The clinical detection device for worm gear pair transmission accuracy of the present invention is designed with a magnet structure to adjust the friction between the mounting platform and the base, so as to avoid the measurement distortion caused by shaking due to inertia during the detection of worm gear transmission. The resistance of table rotation is easy to adjust, no traditional power system is needed to change the resistance, and the controllability has been significantly improved. The structure of the turntable is reasonable, the structure is stable, and the operation is convenient. And with this structure, the worm gear can be directly inspected without disassembly and assembly after processing.

The base of the turntable can be installed and fixed on the workbench of the processing machine tool through the U-shaped groove. During processing, the installation platform and the base can be fixed by pins. The mold of the worm wheel can be directly installed and fixed on the installation platform. Tool and workbench as one. After the worm gear is processed, there is no need to remove the tire mold and worm gear, nor the base of the turntable, only need to loosen the mounting table and base of the turntable, and the worm gear can be inspected without detaching from the processing machine tool , to avoid the accuracy error caused by repeated handling and installation, and it is also convenient for timely matching and correction of the worm gear pair on site.

The clinical detection method of the transmission accuracy of the worm gear pair provided by the present invention realizes the clinical detection of the worm gear without disassembly and assembly, makes the detection of the transmission accuracy simple and easy, and ensures the detection of the overall accuracy of the worm gear pair, which can improve the accuracy of the worm gear pair overall level.

Description of drawings

Fig. 1 is a structural schematic diagram of a specific embodiment of the worm drive detection structure of the present invention;

Fig. 2 is a cross-sectional structure diagram of a specific embodiment of the turntable of the present invention;

Fig. 3 is a top view structure diagram of the turntable in the A-A direction in Fig. 2;

Fig. 4 is a top structural view of the turntable in Fig. 2 .

In the figure: 5-rotary table; 7-centripetal thrust bearing; 8-skateboard; 9-spindle motor drag seat; 901-spindle motor; 10-worm; 14-end gear; -drive motor; 111-dead top; 112-dead top; 130-second lever; 131-first lever; 132-ring sleeve; 140-bearing; 160-installation cylinder; 180-bearing; 181-worm angle Stator of the displacement sensor; 182-rotor of the worm angular displacement sensor; 501-base; 502-mounting table; 503-groove; 504-magnet; U-shaped slot; 509-boss; 601-the stator of the turntable angular displacement sensor; 602-the rotor of the turntable angular displacement sensor.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

The worm tooling in the worm gear transmission accuracy clinical detection device of the present invention is used for the installation of the worm in the worm gear transmission accuracy detection, wherein the worm 10 is installed on the tooling, and the worm angular displacement sensor for detecting the rotation angle of the worm 10 is installed on the tooling . As shown in Figure 1, the frock has a bracket 16, a slide plate 8 positioned above the bracket 16, and a pair of dead centers 111, 112 for supporting the two ends of the worm 10, wherein one dead center 111 is fixed on the bracket 16, and the other dead center 112 is fixed on the slide plate 8, and the two ends of the worm to be tested 10 are supported in the air by dead centers 111, 112 respectively, and the slide plate 8 can slide to adjust the distance between the two dead centers 111, 112. The bracket 16 is provided with a driving motor 17, and the driving motor 17 drives a gear transmission group, and the terminal gear 14 of the gear transmission group is fixed with a lever assembly, which drives the worm screw 10 to rotate and makes the worm screw 10 coaxial with the terminal gear 14, Rotating at the same rotation angle, the stator 181 of the worm angular displacement sensor is fixed on the bracket 16, and the rotor 182 of the worm angular displacement sensor is coaxial with the end gear 14 and rotates at the same rotation angle to measure the rotation angle of the worm 10.

The turntable of the present invention is used to solve the installation problem of the worm gear, as shown in Figure 2, the upper and lower parts of the turntable 5 are respectively a mounting platform 502 and a base 501 that can rotate relatively, and the mounting platform 502 is used to connect the worm gear and is connected on the base 501 , the central portion of the mounting table 502 has a downward boss 509, the boss 509 is coaxial with the mounting table 502 and the base 501, and the rotor 602 of the worm wheel angular displacement sensor is coaxially installed on the boss 509, and the worm wheel angular displacement sensor The stator 601 is connected and fixed with the base 501. A centripetal thrust bearing 7 is also installed on the boss 509 between the installation platform 502 and the base 501 , and the centripetal thrust bearing 7 supports the installation platform 502 and maintains the coaxiality between the installation platform 502 and the base 501 . The stator 601 of the worm gear angular displacement sensor is coaxially fixed with the base 501 of the turntable 5, and the rotor 602 of the worm gear angular displacement sensor is coaxially connected with the mounting table 502 of the turntable 5. When relative rotation occurs between the mounting table 502 of the turntable 5 and the base 501 , The angular displacement sensor of the worm gear measures the displacement and rotation angle of the rotation.

In a specific embodiment, the gear transmission set includes two gears, the starting gear 15 and the final gear 14 are directly meshed, and the starting gear 15 is connected to the driving motor 17 . A mounting cylinder 160 protrudes from the side wall of the bracket 16, the center hole of the end gear 14 is mounted on the mounting cylinder 160 through a bearing 140, and the rotor 182 of the worm angular displacement sensor is also fixed on the mounting cylinder 160 through a bearing 180. The driving rod assembly includes a second driving rod 130 vertically fixed on the end face of the end gear 14 and a first driving rod 131 whose one end is vertically fixed to the second driving rod 130 , and the other end of the first driving rod 131 is covered with a ring sleeve 132 , The collar 132 is inserted and fixed in the rod portion of the worm 10 .

Since the bearing is too flexible to operate, the measurement result may be distorted due to vibration due to inertia during the transmission test of the worm gear pair. For this reason, a special damping structure is designed in this case, as shown in Figure 2 and Figure 3. The upper end surface of the base 501 of the turntable 5 is distributed with several grooves 503 along the circumference, and the grooves 503 are provided with magnets 504 whose north and south poles are in the same direction as the axis of the turntable 5 (that is, in the vertical direction). The distance between the bottom surface and the upper end surface of the base 501. When the magnet 504 is turned upwards and is adsorbed on the lower bottom surface of the installation platform 502, the relative rotation between the installation platform 502 and the base 501 will generate friction resistance; when the magnet 504 is turned downward, the installation platform 502 and the base 501 will rotate relatively There is no frictional resistance. Therefore, the damping between the mounting table 502 and the base 501 can be adjusted by adjusting the number of magnets 504 attracted, that is, when testing the transmission accuracy of the worm gear, the damping of the worm gear can be adjusted. The number of grooves 503 may be six, and the six grooves 503 are symmetrically distributed on both sides of the turntable 5 along the central axis of the turntable 5 , or a plurality of grooves 503 may be evenly distributed along the entire circumference.

In order to realize matching and detection of the worm gear on the machine tool without disassembly (in a clinical state), a through hole 507 is provided on the mounting table 502, and a threaded hole 505 is provided on the upper end surface of the base 501 corresponding to the through hole 507. A pin can be used to lock the two into one body. After the pin is pulled out, the relative rotation between the two can be resumed. The structural principle is shown in Figure 4. There are three through holes 507, and the three through holes 507 are evenly distributed on a circle whose center is located on the central axis of the installation platform 502. The upper end of the through holes 507 is a counterbore, so that the connection between the installation platform 502 and the base 501 is stable. The head of the pin used for connection is accommodated in the counterbore, and does not protrude and affect the installation of the worm gear on the mounting table 502 . The lower end of the base 501 has an arc-shaped step 510 radially facing the outside of the cavity, and six U-shaped grooves 508 for connecting and fixing are evenly distributed on the edge of the arc-shaped step 510. The U-shaped grooves 508 open outward, and pass The U-shaped groove 508 bolts the turntable 5 to the workbench of the processing machine tool. Throughout the processing and testing process, the base 501 is always fixed on the workbench of the machine tool. The mounting table 502 of the turntable 5 is provided with a threaded mounting hole 506 at the top, which is used to connect the mold of the fixed worm wheel. into one.

The angular displacement sensor in this device adopts a high-precision angular displacement sensor with a built-in coupling. The built-in coupling avoids rigid cooperation between the rotor and the stator, and ensures that the two are coaxial and concentric when they rotate relative to each other.

When implementing the detection device, the transmission accuracy of the worm gear pair can be detected by setting tooling and turntable separately, or the structure of the existing machine tool can be used to realize the detection of the worm gear pair without disassembly and assembly after the worm gear processing is completed. The bracket 16 adopts the tool rest bracket of the machine tool, and the slide plate 8 adopts the tool bracket slide plate of the machine tool. After the worm gear is processed, it is not necessary to remove the worm gear. The worm 10 is supported, and the distance between the tip 112 on the tool holder and the other tip 111 is adjusted by sliding the tool holder slide plate. The tool holder of the machine tool is tangentially displaced by the tool holder bracket so that the worm screw 10 and the worm wheel are engaged, and the two are in the same position. In the best meshing state, when testing the transmission accuracy, the spindle motor 901 of the machine tool no longer drives the cutter bar to rotate.

Thus, the clinical detection method of the transmission accuracy of the worm gear pair can specifically include the following steps:

① Install the turntable 5 on the machine tool workbench before the machine tool processes the worm gear, so that the two rotate concentrically. The installation platform 502 of the turntable 5 and the base 501 are fixed by installation pins. 502 becomes a whole, and the height of the center of the worm wheel is adjusted through the mould.

②Install the worm gear to be processed into the mould, and adjust it to rotate concentrically with the turntable 5.

③ After the worm wheel processing is completed, remove the tool and replace the drag seat 16 of the worm tooling (the drive motor 17, the second shift lever 130, the worm angular displacement sensor, and the dead center 111 have been installed in the drag seat 16), and place it on the spindle motor support. Dead apex 112 is installed on the seat 9, mobile knife rest slide plate, ring sleeve 132 is installed on the worm screw, the worm screw 10 to be tested is changed between two dead apexes 111,112, and the first driving rod 131 is installed.

④Remove the pin between the mounting table 502 of the turntable 5 and the base 501, so that the mounting table 502 can rotate freely.

⑤ Check the meshing surface of the worm gear and the worm 10, move the slide plate of the tool holder, and adjust the position of the machine tool table so that the worm gear pair is in the best meshing position.

⑥Start the drive motor, the lever assembly drives the worm 10 to rotate, and adjust the friction between the mounting table 502 and the base 501 of the turntable 5 by the number of magnets 504, so that the worm 10 can drive the worm wheel and the mounting table 502 to rotate smoothly .

⑦Use the worm gear angular displacement sensor and the worm angular displacement sensor to detect the transmission accuracy of the worm gear pair.

⑧ According to the detected transmission accuracy, if it is necessary to further process and correct the worm gear, remove the worm, the drag seat and dead center of the worm tooling, and replace it with the drag seat for processing the worm gear. The mounting table and the base of the turntable are fixed by pins, and then the machine parameters are adjusted according to the transmission accuracy, and the worm gear pair is processed and corrected; if the accuracy meets the requirements, the processing of the worm gear is completed.

This method can realize the one-time installation of the processed worm gear, and the detection of the worm gear without leaving the processing machine tool, which avoids the measurement error and processing error caused by the repeated disassembly and assembly of the processed worm gear, thereby greatly improving the overall accuracy of the worm gear pair, and greatly shortening and simplifying the process. the entire testing process.

This method avoids the measurement error caused by the repeated disassembly and assembly of the angular displacement sensor and the processing error caused by the repeated disassembly and assembly of the worm wheel and worm, thereby greatly improving the overall accuracy of the worm gear pair (not just the accuracy of the worm wheel), and greatly shortening and simplifying the entire detection process. process.

Claims (9)

1. a worm gear transmission accuracy Clinical detection device, comprises turntable and the frock that worm screw is installed for worm gear is installed, and turnsWorm gear angular displacement sensor for detection of the worm gear anglec of rotation is installed in platform, in frock, is provided with for detection of the worm screw anglec of rotationThe worm screw angular displacement sensor of degree, worm gear angular displacement sensor and the output of worm screw angular displacement sensor are connected with worm gear detector, turnBetween platform and frock, can tangential displacement make worm and wheel engagement, it is characterized in that: described frock has bracket, is positioned at bracketThe slide plate of top and a pair of wherein a back dead centre is fixed on bracket for supporting the back dead centre at worm screw two ends, another back dead centre is solidThe spindle motor that fixes on lathe drags seat upper, and slide plate can slide to regulate the distance between two back dead centres; Bracket is provided with and drives electricityMachine, drive motors drives gear drive group, on the end gear of gear drive group, is fixed with driving lever assembly, and driving lever assembly drivesWorm screw rotate and make worm screw and end gear coaxially, synchronize rotation, the stator of worm screw angular displacement sensor is fixed on bracket, snailThe rotor of bar angular displacement sensor is coaxial with end gear, synchronize and rotate the anglec of rotation to measure worm screw; Described turntable comprises energyErecting bed and base in relative rotation, erecting bed is used for connecting worm gear and is connected to base, and the central part of erecting bed has downProjection, projection and erecting bed, base are coaxial, and the rotor coaxial of described angular displacement sensor is arranged on projection, angle displacement transducerStator and the base of device are connected and fixed; Radial thrust bearing is also installed on the projection between erecting bed and base, this centripetal thrust forceThe axiality of bearings erecting bed and maintenance erecting bed and base.

2. worm gear transmission accuracy Clinical detection device according to claim 1, is characterized in that: described gear drive groupComprise the top gear being connected with drive motors, top gear and described end direct geared are meshing, and the centre bore of end gear is logicalCross on the installation cylinder that a bearing is arranged on bracket sidewall evagination, the rotor of worm screw angular displacement sensor is fixed on by another bearingInstall on cylinder; Driving lever assembly comprises that the second driving lever on the end face that is vertically fixed on end gear is vertical with the second driving lever with one endThe first fixing driving lever, the other end cover of the first driving lever has ring set, and ring set is interspersed to be fixed in the bar portion of worm screw.

3. worm gear transmission accuracy Clinical detection device according to claim 1 and 2, is characterized in that: described base isCavity body structure and the upper end of lower ending opening have centre bore, and the bottom of projection is arranged in the cavity of base, snail through this centre boreThe rotor of wheel angular displacement sensor is fixed on the bottom of projection and stator and is fixedly connected on the bottom surface, upper end of base; Groove positionIn the outside of radial thrust bearing; The upper surface of base is evenly equipped with several grooves around its central shaft, and these grooves are circle distribution,In groove, be provided with south poles and turntable shaft to magnet in the same way, the length of magnet is greater than between erecting bed bottom surface and base upper surfaceDistance.

4. a kind of worm gear transmission accuracy Clinical detection device according to claim 3, is characterized in that: described erecting bedBe provided with three through holes that run through up and down, these three through holes are uniformly distributed in the center of circle and are positioned on the circumference on erecting bed central shaft, logicalThe upper end in hole is counterbore, and the upper surface of base is provided with the screwed hole of corresponding through hole, detachable being provided with in through hole and screwed holeOne pin, this pin can be fixed to erecting bed on base, and when this pin dismounting, erecting bed can freely rotate with respect to base.

5. a kind of worm gear transmission accuracy Clinical detection device according to claim 4, is characterized in that: described baseBottom has the radially arc step outside cavity, and the edge part of arc step is evenly equipped with six for connecting machine tool workbenchU-shaped groove, U-shaped channel opening outwardly.

6. a kind of worm gear transmission accuracy Clinical detection device according to claim 4, is characterized in that: described erecting bedUpper surface be provided with 12 threaded mounting holes, these threaded mounting holes are uniformly distributed in the center of circle and are positioned at one on erecting bed central shaftOn circumference, threaded mounting hole is positioned at through hole inner side, and screwed hole is for being fixed to erecting bed by the mold of worm gear or worm gear.

7. worm gear transmission accuracy Clinical detection device according to claim 1 and 2, is characterized in that: described bracket is adoptedWith the knife rest bracket of lathe, described slide plate adopts the sliding carriage of lathe.

8. according to a kind of worm gear transmission accuracy Clinical detection device described in claim 5 or 6, it is characterized in that: described snailWheel angular displacement sensor and all built-in shaft couplings of worm screw angular displacement sensor.

9. a worm gear transmission accuracy Clinical detection method, is characterized in that, comprises the steps:

1. turntable is installed before machine tooling worm gear on platen, the base of turntable is fixed on by its U-shaped slot boltOn platen, make turret base and platen with one heart, synchronous revolving;

2. pin is installed, is made to be fixed together between the erecting bed of turntable and base;

3. mold is installed on the erecting bed of turntable and makes mold and erecting bed become entirety, adjust the height at worm gear center by moldDegree, is installed in mold by worm gear to be processed and adjusts it and turn round with turntable is concentric;

4. after worm gear machines, the cutter of backing off, changes worm screw frock, on spindle motor bracket, installs back dead centre, adjustsDrag seat and spindle motor to drag the distance between seat that worm screw is installed, then the first driving lever is installed;

5. take off the pin between erecting bed and the base of turntable, erecting bed can freely be rotated with respect to base;

6. follow rest slide plate, adjusts lathe operating position, makes worm gear in optimal engagement position;

7. start the drive motors of worm screw frock, driving lever assembly drives worm screw to rotate, and adjusts turntable by stirring magnet numberFrictional force between erecting bed and base, makes worm screw can drive worm gear and erecting bed smooth rotation;

8. by turntable angular displacement sensor and worm screw angular displacement sensor, detect the transmission accuracy of worm gear;

9. according to the transmission accuracy situation detecting, if desired further worm gear is revised in processing, pulls down worm screw and worm screw frock,To between the erecting bed of turntable and base, fix by pin, then adjust lathe parameter according to transmission accuracy situation, worm gear is enteredRow processing is revised; If accuracy situation meets the demands, complete the processing of worm gear.