Testing device for double-shaft tilt angle sensor

Abstract

The invention discloses a testing device for a double-shaft tilt angle sensor, which comprises a double-shaft tilt angle sensor, a sensor mounting flat plate, four cylinders and a base flat plate, and is characterized in that the double-shaft tilt angle sensor is mounted on the sensor mounting flat plate, and the cylinders are mounted on the base flat plate; four pairs of external tooth fisheye rod end joint bearings are symmetrically arranged at four corners of the bottom surface of the sensor mounting flat plate, and an internal tooth fisheye rod end joint bearing is arranged in the middle of each pair of external tooth fisheye rod end joint bearings and is connected with the external tooth fisheye rod end joint bearings through a half-tooth bolt rod; the lower end of each inner-tooth fisheye rod end joint bearing is connected with the front end of a piston rod of an air cylinder, each air cylinder is connected with an air source through an air pipe, a five-way connector is arranged on the air pipe between each air cylinder and the air source, and a pneumatic switch hand plate valve is arranged on the air pipe between each air cylinder and the five-way connector. Double-shaft four-direction inclination can be completed through one set of device, and the purposes of saving cost and simplifying the device are achieved.

Description

Technical Field

[0001] The invention belongs to the field of testing technology, and in particular relates to a testing device for a dual-axis tilt sensor. Background Art

[0002] The inclination sensor is used to measure the angle between the installation reference plane and the horizontal plane. The MEMS inclination sensor has the advantages of smaller size and lower power consumption, but its disadvantage is that it is very sensitive to temperature changes and can easily produce large errors. Therefore, a reliability enhancement test is carried out to obtain the performance base of the inclination sensor, so as to achieve the purpose of precipitating defects and improving the design. The inclination angle test is carried out in high and low temperature environments and temperature change environments. Therefore, a inclination test device that can be used in high and low temperature environments and temperature change environments is designed.

[0003] Tilt sensors are widely used in engineering machinery, vehicles, aviation and other fields. However, tilt sensors are prone to errors in high and low temperature and temperature changing environments. Therefore, it is necessary to invent a low-cost and environmentally resistant tilt test device for dual-axis tilt sensors and conduct reliability enhancement tests on dual-axis tilt sensors. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides a testing device for a dual-axis tilt sensor.

[0005] The present invention provides the following technical solutions: A testing device for a dual-axis inclination sensor comprises a dual-axis inclination sensor, a sensor mounting plate, four cylinders and a base plate, wherein the dual-axis inclination sensor is mounted on the sensor mounting plate, the cylinder is mounted on the base plate, four pairs of external-thread fisheye rod end joint bearings are symmetrically arranged at the four corners of the bottom surface of the sensor mounting plate, an internal-thread fisheye rod end joint bearing is arranged in the middle of each external-thread fisheye rod end joint bearing, a half-thread bolt rod is commonly penetrated through each external-thread fisheye rod end joint bearing and the internal-thread fisheye rod end joint bearing therebetween, a first nut is arranged at the other end of the half-thread bolt rod, the lower end of each internal-thread fisheye rod end joint bearing is connected to the front end of the piston rod of one of the cylinders, each cylinder is connected to an air source through an air pipe, a five-way joint is commonly arranged on the air pipe between each cylinder and the air source, and a pneumatic switch hand valve is arranged on the air pipe between each cylinder and the five-way joint.

[0006] Furthermore, the sensor mounting plate is rectangular, and the dual-axis tilt sensor is fixed on the sensor mounting plate through four mounting holes.

[0007] Furthermore, the external fisheye rod end joint bearing passes through the sensor mounting plate and is fixed at four corners of the sensor mounting plate by second nuts.

[0008] Further, the base flat plate is rectangular, and the cylinder, the five-way joint, and the pneumatic switch hand valve are fixed on the base flat plate.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When the device is in use, the air source can output compressed air of 0.3 MPa to 0.4 MPa through air pump treatment. The compressed air serves as the power source for the inclination of the sensor installation flat plate. The four pneumatic switch hand valves correspond to the cylinders one by one as the control part. When the two cylinders on the same side are opened, the flat plate on this side can be raised to achieve the purpose of inclination.

[0010] 2. A half-thread bolt rod is commonly inserted through each pair of external-threaded spherical rod end bearings and the internal-threaded spherical rod end bearings therebetween. A first nut is provided at the other end of the half-thread bolt rod. This connection method fixed by three spherical bearings and the movable angle of the rollers built into the spherical bearings can avoid physical interference caused by the height change on one side of the flat plate, resulting in jamming or wear.

[0011] 3. By controlling the four pneumatic switch hand valves, the cylinders can achieve the following four combination modes: ① The upper left "rises", the lower left "rises", the upper right "remains stationary", and the lower right "remains stationary"; ② The upper right "rises", the lower right "rises", the upper left "remains stationary", and the lower left "remains stationary"; ③ The upper left "rises", the upper right "rises", the lower left "remains stationary", and the lower right "remains stationary"; ④ The lower left "rises", the lower right "rises", the upper left "remains stationary", and the upper right "remains stationary". As a result, four situations are caused: in sequence, tilting in the -X, +X, +Y, and -Y directions. A set of devices can be used to complete the double-axis four-direction inclination, achieving the purpose of cost saving and device simplification. At the same time, according to different inclination angle requirements, the stroke of the cylinder is limited and adjusted to the required inclination angle value to meet different angle requirements within a certain range. The inclination angle of the flat plate can be calculated through the extended length of the cylinder piston rod.

[0012] 4. The device has the characteristics of simple structure, resistance to extreme environments, and convenient replacement and maintenance. Description of the Drawings

[0013] Figure 1 is a schematic diagram of the present invention; Figure 2 is a schematic diagram of the external-threaded spherical rod end bearing Figure 1 ; Figure 3 is a schematic diagram of the external-threaded spherical rod end bearing Figure 2 ; Figure 4 is a schematic diagram of the internal-threaded spherical rod end bearing Figure 1 ; Figure 5 is a schematic diagram of the internal-threaded spherical rod end bearing Figure 2 ; Figure 6 It is a schematic diagram of the combined structure of a sensor mounting plate, an external thread fisheye rod end joint bearing, an internal thread fisheye rod end joint bearing, a half thread bolt rod and a cylinder; Figure 7 This is a schematic diagram of a pneumatic switch hand valve. Figure 1 ; Figure 8 This is a schematic diagram of a pneumatic switch hand valve. Figure 2 ; Fig. 9 It is a schematic diagram of the cylinder position; Fig.10 This is a schematic diagram of cylinder 1# and cylinder 4# starting and tilting in the +X direction.

[0014] Among them, 1-dual-axis inclination sensor, 2-sensor mounting plate, 3-cylinder, 4-base plate, 5-external fisheye rod end joint bearing, 6-internal fisheye rod end joint bearing, 7-half-thread bolt rod, 8-first nut, 9-air source, 10-five-way joint, 11-air pipe, 12-pneumatic switch hand valve, 121-air inlet, 122-air outlet, 13-second nut. DETAILED DESCRIPTION

[0015] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] like Figure 1-Figure 10 As shown, a test device for a dual-axis inclination sensor comprises a dual-axis inclination sensor 1, a sensor mounting plate 2, four cylinders 3 and a base plate 4, wherein the dual-axis inclination sensor 1 is mounted on the sensor mounting plate 2, the cylinders 3 are mounted on the base plate 4, and four external-tooth fisheye rod end joint bearings 5 ​​are symmetrically arranged at the four corners of the bottom surface of the sensor mounting plate 2, and an internal-tooth fisheye rod end joint bearing 6 is arranged in the middle of each pair of external-tooth fisheye rod end joint bearings 5, and each pair of external-tooth fisheye rod end joint bearings 5 ​​is provided with a plurality of internal-tooth fisheye rod end joint bearings 6. A half-thread bolt rod 7 is commonly passed through the end joint bearing 5 and the inner-thread fisheye rod end joint bearing 6 therebetween, and a first nut 8 is arranged at the other end of the half-thread bolt rod 7. The lower end of each inner-thread fisheye rod end joint bearing 6 is connected to the front end of the piston rod of one of the cylinders 3, and each cylinder 3 is connected to the air source 9 through an air pipe. A five-way joint 10 is commonly arranged on the air pipe between each cylinder 3 and the air source 9, and a pneumatic switch hand valve 12 is arranged on the air pipe 11 between each cylinder 3 and the five-way joint 10.

[0017] The sensor mounting plate 2 of the test device for the dual-axis tilt sensor is rectangular, and the dual-axis tilt sensor 1 is fixed on the sensor mounting plate 2 through four mounting holes.

[0018] The external fisheye rod end joint bearing 5 of the test device for the dual-axis inclination sensor passes through the sensor mounting plate 2 and is fixed at the four corners of the sensor mounting plate 2 by second nuts 13 .

[0019] The test device for the dual-axis inclination sensor has a base plate 4 that is rectangular, and the cylinder 3 , the five-way joint 10 and the pneumatic switch hand valve 12 are fixed on the base plate 4 .

[0020] The cylinder 3 is an adjustable thin cylinder, and the cylinder 3 can adjust the inclination of the sensor mounting plate 2 by extending the piston rod.

[0021] The sensor mounting plate 2 can be adjusted in four directions in the ±X and ±Y axes within a tilt angle of 2°.

[0022] The piston rod of the cylinder 3 is connected to the inner fisheye rod end joint bearing 6, and the inner fisheye rod end joint bearing 6 is clamped between two outer fisheye rod end joint bearings 5. The half-bolt rod 7 passes through the two outer fisheye rod end joint bearings 5 ​​and one inner fisheye rod end joint bearing 6, and the other end is fixed with a first nut 8.

[0023] The base plate 4 is rectangular and is used to fix the cylinder 3, the pneumatic switch hand valve 12 and the five-way joint 10.

[0024] The air source 9 is a device with a manually controlled ball valve and can provide 0.3-0.4 MPa compressed air.

[0025] The five-way connector 10 is a Y-shaped one-inlet and four-outlet quick connector.

[0026] The pneumatic switch hand valve 12 is used to manually adjust the direction of the switch handle to control the opening and closing of the valve. It has an air inlet 121 and an air outlet 122. The air inlet 121 is used to connect to the air source 9, and the two air outlets 122 are used to connect to the cylinder 3.

[0027] The specific tests are as follows: The dual-axis inclination sensor 1 is in the shape of a rectangular parallelepiped with mounting ear shafts on both sides, and is fixed to the upper side of the sensor mounting plate 2 by 4 screws. The outer rod ends of 4 pairs of external fisheye rod end joint bearings 5 ​​pass through the through holes at the four corners of the sensor mounting plate 2 from bottom to top and are fixed on the other side by the second nut 13. Each external fisheye rod end joint bearing 5 has an internal fisheye rod end joint bearing 6 sandwiched in the middle, and is connected and fixed by a half-thread bolt rod 7 and a first nut 8. This connection method fixed by three fisheye bearings and utilizing the movable angle of the built-in roller of the fisheye bearing can avoid physical interference caused by the height change of one side of the plate to cause jamming or wear. The internal thread of the internal thread fisheye rod end joint bearing 6 is connected to the piston rod of the cylinder 3. The cylinder 3 is installed on the base plate 4 through 4 screws. There are 4 cylinders 3 and their connected fisheye bearings symmetrically distributed at the four corners of the sensor installation plate 2. The two outlet ends of the pneumatic switch hand valve 12 are connected to the two inlet ends of one cylinder 3 through two air pipes 11. There are 4 pneumatic switch hand valves 12 to control the corresponding cylinders 3 point-to-point, and they are fixed to the base plate 4 through 4 screws respectively. By controlling the switch of the 4 pneumatic switch hand valves 12, the opening / closing of the cylinders 3 at the four corners can be controlled to achieve the purpose of tilting in the specified direction. The inlet end of the pneumatic switch hand valve 12 is connected to one of the 4 outlet ends of the five-way joint 10 through the air pipe, and one inlet end of the five-way joint 10 is connected to the air source 9 through the main air inlet air pipe. The air source 9 can provide 0.3~0.4MPa compressed air as the power source of the tilting device.

[0028] After the installation is completed as described above, a tilt test is performed, the four pneumatic switch hand valves 12 are closed, the control ball valve of the air source 9 is opened, and the corresponding two pneumatic switch hand valves 12 are controlled to open according to the tilt direction requirements. The two corners of the sensor mounting plate 2 are tilted to the specified angle after the piston rod of the cylinder 3 is pushed out to the full stroke.

[0029] In actual application: (1) First, according to the tilt angle requirement and the full stroke value of the cylinder 3 (i.e., the raised distance on one side of the sensor mounting plate 2), the trigonometric function calculation formula is used to calculate the distance between the raised side and the retained side of the sensor mounting plate 2, and based on this, a hole is punched in the sensor mounting plate 2 to locate the installation position of the cylinder 3. The calculation formula is as follows:

[0030] Where θ is the inclination angle, a is the stroke value of the cylinder 3, and c is the distance between the two cylinders 3 on the extended side and the retained side of the sensor mounting plate 2; (2) In order to meet the requirement of dual-axis four-way tilting, the distances between the four cylinders 3 are all positioned as c. Specifically, for example, the distance from the center point of the piston rod of cylinder one to the center point of the piston rod of cylinder two is c; (3) Number the four cylinders 3 according to their positions, such as the upper left is cylinder 2, the lower left is cylinder 3, the upper right is cylinder 1, and the lower right is cylinder 4; (4) Install the calibrated high-precision inclination sensor on the test plane, and check the difference between the measured angle value of the product and the angle value calculated in step (1) after tilting in the +X direction; then change the cylinder stroke by changing the limit position of the cylinder to achieve the result of changing the inclination angle; use a set of angle values ​​measured at different cylinder strokes to correct the angle value calculated by the formula, and after specifying the inclination angle value θ', use the following formula to adjust the cylinder stroke position, where k is the empirical correction coefficient:

[0031]

[0032] (5) The four pneumatic switch hand valves 12 correspond to each other and independently control the four cylinders 3. Figure 1 The XY axis markings of the dual-axis inclination sensor 1 are shown in the figure, and the four pneumatic switch hand valves 12 are numbered according to the numbers of the controlled cylinders 3, and the corresponding relationship is: the upper left-2nd quadrant corresponds to the pneumatic switch hand valve 2, the lower left-3rd quadrant corresponds to the pneumatic switch hand valve 3, the upper right-1st quadrant corresponds to the pneumatic switch hand valve 1, and the lower right-4th quadrant corresponds to the pneumatic switch hand valve 4; (6) Open the pneumatic switch hand valve 2 and the pneumatic switch hand valve 3 to extend the piston rods of the corresponding cylinders 2 and 3. At this time, the -X tilt angle is θ'.

[0033] (7) Similarly, the four-way tilting requirement can be achieved by combining two of the four pneumatic switch hand valves 12.

[0034] In this way, the tilt performance test of the dual-axis inclination sensor is realized at low cost and in an environment-resistant manner.

[0035] In summary, the test device for the dual-axis tilt sensor in the present invention outputs 0.3MPa~0.4MPa compressed air as the power source for the sensor installation plate to tilt, and 4 pneumatic switch hand valves correspond to the cylinders one by one as the control part. When the two cylinders on the same side are turned on, the plate can be controlled to rise on this side to achieve the purpose of tilting. The device controls the 4 pneumatic switch hand valves, and the cylinders can achieve the following four combinations: ① the upper left "rise", the lower left "rise", the upper right "immobile", and the lower right "immobile"; ② the upper right "rise", the lower right "rise", the upper left "immobile", and the lower left "immobile"; ③ the upper left "rise", the upper right "rise", the lower left "immobile", and the lower right "immobile"; ④ the lower left "rise", the lower right "rise", the upper left "immobile", and the upper right "immobile", resulting in four results: -X, +X, +Y, and -Y tilt in sequence, and a set of devices can be used to complete the dual-axis four-way tilt to achieve the purpose of saving costs and simplifying the device. At the same time, according to different inclination angle requirements, the stroke of the cylinder is limited and adjusted to the required inclination angle value to meet different angle requirements within a certain range. The inclination angle of the plate can be calculated by the extension length of the cylinder piston rod. The device has the characteristics of simple structure, extreme environment resistance and convenient replacement and maintenance.

[0036] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A test device for a dual-axis tilt sensor, characterized in that: The invention comprises a dual-axis inclination sensor (1), a sensor mounting plate (2), four cylinders (3) and a base plate (4), wherein the dual-axis inclination sensor (1) is mounted on the sensor mounting plate (2), the cylinders (3) are mounted on the base plate (4), four pairs of external fisheye rod end joint bearings (5) are symmetrically arranged at four corners of the bottom surface of the sensor mounting plate (2), an internal fisheye rod end joint bearing (6) is arranged in the middle of each external fisheye rod end joint bearing (5), and each external fisheye rod end joint bearing (5) and the internal fisheye rod end joint bearing (6) therebetween are arranged in a plurality of pairs of external fisheye rod end joint bearings (5). A half-thread bolt rod (7) is inserted into the toothed fisheye rod end joint bearing (6), and a first nut (8) is provided at the other end of the half-thread bolt rod (7). The lower end of each inner toothed fisheye rod end joint bearing (6) is connected to the front end of the piston rod of a cylinder (3), and each cylinder (3) is connected to an air source (9) through an air pipe. A five-way joint (10) is provided on the air pipe between each cylinder (3) and the air source (9), and a pneumatic switch hand valve (12) is provided on the air pipe (11) between each cylinder (3) and the five-way joint (10).

2. The test device for a dual-axis tilt sensor according to claim 1, characterized in that: The sensor mounting plate (2) is rectangular, and the dual-axis tilt sensor (1) is fixed on the sensor mounting plate (2) via four mounting holes.

3. The testing device for a dual-axis tilt sensor according to claim 1, characterized in that: The external fisheye rod end joint bearing (5) passes through the sensor mounting plate (2) and is fixed at the four corners of the sensor mounting plate (2) via second nuts (13).

4. The test device for a dual-axis tilt sensor according to claim 1, characterized in that: The base plate (4) is rectangular, and the cylinder (3), the five-way joint (10) and the pneumatic switch hand valve (12) are fixed on the base plate (4).

Images