CN114942148A - General test bench for motor home traction device and test method - Google Patents

Abstract

The invention discloses a universal test bench for a recreational vehicle traction device and a test method, wherein the universal test bench comprises a fixed support for the recreational vehicle traction device, an X-direction channel, a Y-direction channel, a Z-direction channel and a load loading device; the limo traction device fixing support is used for fixing a limo traction device to be tested; the X-direction channel, the Y-direction channel and the Z-direction channel are respectively connected with a load loading device, the X-direction channel and the Y-direction channel are horizontally fixed on the ground and are respectively connected with the load loading device along the X direction and the Y direction, and the Z-direction channel is fixed on the ground through a large vertical support and is connected with the load loading device along the Z direction; the X-direction channel, the Y-direction channel and the Z-direction channel work cooperatively to load resultant force on the load loading device, so that the stress condition of the recreational vehicle traction device in the actual use process is reduced to the maximum extent. The device is suitable for European regulation standards, strong in universality, high in accuracy, rapid and efficient, and capable of monitoring in real time.

Description

A universal test bench and test method for RV traction device

technical field

The invention belongs to the technical field of test benches, relates to a traction device test bench, and in particular relates to a general test bench and a test method for a RV traction device.

Background technique

The acceleration, braking, steering, etc. of the trailer-type RV are all input by the RV traction device as the load. Therefore, the RV traction device is subjected to complex forces in actual working conditions, and the loads in the three directions are superimposed on each other, so it is difficult to use a single load to fully assess it.

At present, there is no professional test device and test method to verify the durability of RV traction devices specified in European regulations and standards. There is no effective test device for single-channel loading and multi-channel road spectrum iteration.

There are two-channel test devices in the prior art, but they cannot meet the current regulatory certification requirements, and have low versatility, which cannot take into account the single-channel loading.

In order to conduct a comprehensive and detailed assessment of the RV traction device during the product development process, and to restore the actual operating conditions of the RV traction device to the greatest extent, it is urgent to design a test device suitable for performance tests and up to 3-channel durability tests. The principle and operating conditions are different from those of the prior art.

SUMMARY OF THE INVENTION

In order to make up for the technical gap in the field of durability testing of RV traction devices, the present invention provides a general test bench and test method for RV traction devices, which are applicable to European regulations and standards. The device has strong versatility, high accuracy, and is fast and efficient. And can monitor in real time.

The object of the present invention is achieved through the following technical solutions, in conjunction with the accompanying drawings:

As an aspect of the present invention, a general test bench for a RV traction device is provided, including a RV traction device fixing bracket 1, an X-direction channel 3, a Y-direction channel 4, a Z-direction channel 5, and a load loading device 6; the RV traction device is fixed The bracket 1 is used to fix the traction device 2 of the RV to be tested; the X-direction channel 3, the Y-direction channel 4, and the Z-direction channel 5 are respectively connected with the load loading device 6, and the X-direction channel 3 and the Y-direction channel 4 are horizontally fixed on the ground and respectively. It is connected with the load loading device along the X and Y directions, the Z channel 5 is fixed on the ground through the vertical large bracket 5a and is connected with the load loading device along the Z direction; X channel 3, Y channel 4, Z channel 5 Working together, the resultant force is loaded on the load loading device 6 to restore the force of the RV traction device during actual use to the greatest extent.

Further, the load loading device 6 includes a load loading sleeve 6a, and the bottom of the load loading sleeve 6a is provided with a coupling ball fixing pad 6c, which is used to hinge the traction device 2 of the RV under test; The end faces in each direction are provided with connecting holes 6a2 for connecting the X-direction channel 3, the Y-direction channel 4, and the Z-direction channel 5 respectively; the rear end of the load-loading sleeve 6a is fixed with a load-loading end cover 6b.

Further, the bottom of the load loading sleeve 6a is provided with an empty groove, and the coupling ball fixing pad 6c is installed in the empty groove.

Further, a tow hook connection groove 6a1 is formed inside the coupling ball fixing block 6c, and the tow hook connection groove 6a1 is used to wrap the tow hook coupling ball 2b1 of the RV traction device 2 under test and form a rotational connection.

Furthermore, the outer surface 6c2 of the coupling ball fixing spacer 6c is in an interference fit with the hollow groove on the bottom surface of the load-loading sleeve 6a and the load-loading end cover 6b, respectively.

Further, the connecting ball fixing block 6c is formed by butting two symmetrical modules.

Further, the structures of the X-direction channel 3, Y-direction channel 4, and Z-direction channel 5 are the same, including the actuator, the extension rod 3a, the spherical hinge 3b, the loading cross bar 3c, the U-shaped fork 3d, the front of the actuator. The bracket 3e and the rear bracket 3f of the actuator; the two ends of the actuator are respectively connected to the front bracket 3e of the actuator and the rear bracket 3f of the actuator, the output end of the actuator is connected to the U-shaped fork 3d, and the loading cross bar 3c is connected to the On the U-shaped fork 3d, the ball hinge 3b is hinged on the loading cross bar 3c, the extension rod 3a is fixed on the end of the ball hinge 3b, and the end of the extension rod 3a is connected with the load loading device 6.

Further, the actuator is a hydraulic actuator.

Further, the RV traction device fixing bracket 1 is composed of two bracket mechanisms with the same structure. The bracket mechanism includes a tailstock 1a and a support plate 1b. The tailstock 1a is provided with a vertical long slot, and the support plate 1b passes through The bolts are fixedly connected to the long grooves on the tailstock 1a, and the fixed position can be adjusted up and down; the lower end surface of the support plate 1b is connected to the beam installation point of the traction device 2 of the RV to be tested through bolts.

As another method of the present invention, a test method for a universal test bench for a RV traction device is provided, comprising the following steps:

S1. Sample installation: connect the test sample to the X-direction channel, Y-direction channel, and Z-direction channel, and reset the force sensor and displacement sensor of the actuator of each channel;

S2, X-direction channel loading test:

S21. The X-direction channel loads the load at a constant speed from 0 to the load extreme value in the road spectrum, and measures and records the X-direction channel load and X-direction channel displacement;

S22. Calculate the stiffness in the X direction, if the stiffness does not exceed the preset value, paste the strain gauge in the X direction on the body-in-white;

S23. Install a Z-direction displacement sensor on the traction device of the RV to be tested;

S24. The X-direction channel loads the load at a constant speed from 0 to the load extreme value in the road spectrum, and measures and records the X-direction channel load and X-direction channel displacement;

S25. The Z-direction channel loads the load at a constant speed from 0 to the load extreme value in the road spectrum, and measures and records the Z-direction channel load and Z-direction channel displacement;

S26. Determine the linearity of the X-direction channel load-displacement relationship curve, and set the X-item displacement protection value;

S27. Determine the linearity of the relationship between the X-direction channel load and the strain value of each strain gauge in the X-direction, and adjust the position of the strain gauge;

S3, Y-direction channel loading test: the same as the steps S21, S22, S24, S25, S27;

S4, Z-direction channel loading test: the same as the steps S24, S25, S27;

S5, performing road spectrum iteration in sequence until the iterative precision of each road spectrum reaches a preset value;

S6. Play the iterative spectrum, measure and record the channel load values in the X, Y, and Z directions during the test, the displacement values of the displacement sensor X1~X8, and the strain gauge strain values σ1~σ16; calculate the body-in-white and the traction device in all directions after the test stiffness.

The present invention has the following beneficial effects:

The present invention is a set of three-channel test bench, which works together through the Y-direction channel, the Y-direction channel and the Z-direction channel to load the force on the load loading device, so as to restore the force of the RV traction device in the actual use process to the greatest extent. .

The coupling ball fixing pad 6c of the load loading device of the present invention is a spherical structure, wrapping the coupling ball 2b1 of the RV traction device, increasing the contact area between the two, and controlling the load loading without deviation.

The coupling ball fixing pad 6c of the load loading device of the present invention has a spherical structure and has mechanical decoupling capabilities in three directions of X, Y and Z. The outer surface is designed with a cylindrical structure and has mechanical decoupling capabilities in both X and Z directions. .

A fixed point that cannot be rotated is designed on the load loading sleeve 6a of the load loading device of the present invention, and a hinge is designed at the actuator end to avoid the appearance of a two-force rod.

The Y-direction channel, Y-direction channel and Z-direction channel of the present invention are all connected to the actuator with a "U"-shaped fork, and the three installation directions of the "U"-shaped fork amplify the mechanical decoupling capability of the stand.

The flatness of the lower end surface of the support plate 1b of the fixing bracket of the RV traction device of the present invention is less than 1.0, which ensures that the hand force of the beam is uniform.

The present invention can be used for single-channel, two-channel and three-channel load loading, and is suitable for regular waveform and random waveform loading, and has high versatility.

Description of drawings

In order to explain the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the drawings to be used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the contents of the embodiments of the present invention and these drawings without any creative effort.

1 is a schematic structural diagram of a general test bench for a RV traction device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a fixing bracket for a RV traction device of a universal test bench for a RV traction device according to an embodiment of the present invention;

3 is a schematic diagram of a RV traction device for a universal test bench for a RV traction device according to an embodiment of the present invention;

4 is a schematic diagram of an X-direction passage of a universal test bench for a RV traction device according to an embodiment of the present invention;

5 is a schematic diagram of a Z-direction passage of a universal test bench for a traction device of an RV according to an embodiment of the present invention;

6 is a schematic diagram of a load loading device for a universal test bench for a RV traction device according to an embodiment of the present invention;

7 is a schematic diagram of the use state of the load loading device during the R55 foul certification test of a universal test bench for an RV traction device according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a load loading sleeve of a universal test bench for a RV traction device according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a universal test bench for a traction device of an RV according to an embodiment of the present invention;

In the picture:

1- RV traction device fixing bracket; 2- RV traction device; 3-X-direction channel; 4-Y-direction channel; 5-Z-direction channel; 6-Load loading device;

1a-tailstock; 1b-support plate;

2a-beam; 2b-trailer hook; 2b1-trailer hook coupling ball;

3a-extension rod; 3b-ball hinge; 3c-loading cross bar; 3d-U-fork; 3e-X-direction actuator front bracket; 3f-X-direction actuator rear bracket;

5a-vertical large bracket; 5b-Z-direction actuator front bracket; 5c-Z-direction actuator rear bracket;

6a-loading sleeve; 6a1-trailer hook connection slot; 6a2-connecting hole; 6b-loading end cap; 6c-joint ball fixing pad.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

A universal test bench for an RV traction device includes a RV traction device fixing bracket 1, an X-direction channel 3, a Y-direction channel 4, a Z-direction channel 5, and a load loading device 6; the RV traction device fixing bracket 1 is used for fixing the RV to be tested. Traction device 2; X-direction channel 3, Y-direction channel 4, Z-direction channel 5 are respectively connected with load loading device 6, X-direction channel 3 and Y-direction channel 4 are horizontally fixed on the ground and are connected to the load along X and Y directions respectively. The loading device is connected, and the Z-direction channel 5 is fixed on the ground through the vertical large bracket 5a and is connected with the load loading device along the Z-direction; the X-direction channel 3, Y-direction channel 4, and Z-direction channel 5 work together to load the resultant force on the load. On the loading device 6, the force of the RV traction device during actual use is restored to the greatest extent.

Further, the load loading device 6 includes a load loading sleeve 6a, and the bottom of the load loading sleeve 6a is provided with a coupling ball fixing pad 6c, which is used to hinge the traction device 2 of the RV under test; The end faces in each direction are provided with connecting holes 6a2 for connecting the X-direction channel 3, the Y-direction channel 4, and the Z-direction channel 5 respectively; the rear end of the load-loading sleeve 6a is fixed with a load-loading end cover 6b.

Further, the bottom of the load loading sleeve 6a is provided with an empty groove, and the coupling ball fixing pad 6c is installed in the empty groove.

Further, a tow hook connection groove 6a1 is formed inside the coupling ball fixing block 6c, and the tow hook connection groove 6a1 is used to wrap the tow hook coupling ball 2b1 of the RV traction device 2 under test and form a rotational connection.

Furthermore, the outer surface 6c2 of the coupling ball fixing spacer 6c is in an interference fit with the hollow groove on the bottom surface of the load-loading sleeve 6a and the load-loading end cover 6b, respectively.

Further, the connecting ball fixing block 6c is formed by butting two symmetrical modules.

Further, the structures of the X-direction channel 3, Y-direction channel 4, and Z-direction channel 5 are the same, including the actuator, the extension rod 3a, the spherical hinge 3b, the loading cross bar 3c, the U-shaped fork 3d, the front of the actuator. The bracket 3e and the rear bracket 3f of the actuator; the two ends of the actuator are respectively connected to the front bracket 3e of the actuator and the rear bracket 3f of the actuator, the output end of the actuator is connected to the U-shaped fork 3d, and the loading cross bar 3c is connected to the On the U-shaped fork 3d, the ball hinge 3b is hinged on the loading cross bar 3c, the extension rod 3a is fixed on the end of the ball hinge 3b, and the end of the extension rod 3a is connected with the load loading device 6.

Further, the actuator is a hydraulic actuator.

Further, the RV traction device fixing bracket 1 is composed of two bracket mechanisms with the same structure. The bracket mechanism includes a tailstock 1a and a support plate 1b. The tailstock 1a is provided with a vertical long slot, and the support plate 1b passes through The bolts are fixedly connected to the long grooves on the tailstock 1a, and the fixed position can be adjusted up and down; the lower end surface of the support plate 1b is connected to the beam installation point of the traction device 2 of the RV to be tested through bolts.

Further, the surface flatness of the lower end surface of the support plate 1b is less than 0.5.

A test method for a universal test bench for an RV traction device, comprising the following steps:

S1. Sample installation: connect the test sample to the X-direction channel, Y-direction channel, and Z-direction channel, and reset the force sensor and displacement sensor of the actuator of each channel;

S2, X-direction channel loading test:

S21. The X-direction channel loads the load at a constant speed from 0 to the load extreme value in the road spectrum, and measures and records the X-direction channel load and X-direction channel displacement;

S22. Calculate the stiffness in the X direction, if the stiffness does not exceed the preset value, paste the strain gauge in the X direction on the body-in-white;

S23. Install a Z-direction displacement sensor on the traction device of the RV to be tested;

S24. The X-direction channel loads the load at a constant speed from 0 to the load extreme value in the road spectrum, and measures and records the X-direction channel load and X-direction channel displacement;

S25. The Z-direction channel loads the load at a constant speed from 0 to the load extreme value in the road spectrum, and measures and records the Z-direction channel load and Z-direction channel displacement;

S26. Determine the linearity of the X-direction channel load-displacement relationship curve, and set the X-item displacement protection value;

S27. Determine the linearity of the relationship between the X-direction channel load and the strain value of each strain gauge in the X-direction, and adjust the position of the strain gauge;

S3, Y-direction channel loading test: the same as the steps S21, S22, S24, S25, S27;

S4, Z-direction channel loading test: the same as the steps S24, S25, S27;

S5, performing road spectrum iteration in sequence until the iterative precision of each road spectrum reaches a preset value;

S6. Play the iterative spectrum, measure and record the channel load values in the X, Y, and Z directions during the test, the displacement values of the displacement sensor X1~X8, and the strain gauge strain values σ1~σ16; calculate the body-in-white and the traction device in all directions after the test stiffness.

Example 1

As shown in FIG. 1 , a general test bench for a RV traction device includes: a RV traction device fixing bracket 1 , an X-direction channel 3 , a Y-direction channel 4 , a Z-direction channel 5 , and a load loading device 6 .

The RV traction device fixing bracket 1 is used to fix the RV traction device 2; the X-direction channel 3, Y-direction channel 4, and Z-direction channel 5 are respectively connected to the load loading device 6, and the X-direction channel 3 is used to simulate processes such as uniform speed, acceleration, and deceleration. The Y channel 4 is used to simulate the side load of the RV traction device 2 during the turning process of the vehicle; the Z channel 5 is used to simulate the gravity of the trailer RV, and the acceleration and deceleration during the vehicle operation. The vertical load generated by the pitching action; the three channels work together to load the resultant force on the load loading device 6 to maximize the force on the RV traction device during actual use.

As shown in Figure 2, the RV traction device fixing bracket 1 is composed of two bracket mechanisms with the same structure. The bracket mechanism includes a tailstock 1a and a support plate 1b. The tailstock 1a is provided with a vertical long groove, and the support plate 1b It is fixedly connected with the long slot on the tailstock 1a by bolts, and the fixed position can be adjusted up and down. The support plate 1b replaces the tractor mounting surface. The lower end surface of the support plate 1b is connected with the installation point of the beam of the RV traction device 2 through bolts. The surface flatness of the lower end surface of the support plate 1b is less than 0.5 to ensure that the four fixing bolts are evenly stressed and reduce the deviation of results caused by installation reasons.

As shown in Figure 3, the RV traction device 2 is composed of a beam 2a and a trailer hook 2b. The trailer hook 2b has a trailer hook coupling ball 2b1 at the tail end. The trailer hook coupling ball 2b1 is the load loading point of the test bench. The towing device 2 of the RV is the sample, and is not described here for ease of understanding.

As shown in FIG. 4 , the X-direction channel 3 includes an actuator, an extension rod 3a, a spherical hinge 3b, a loading crossbar 3c, a U-shaped fork 3d, a front actuator bracket 3e and an actuator rear bracket 3f; the actuator Both ends are respectively fixed on the front bracket 3e of the actuator and the rear bracket 3f of the actuator, the output end of the actuator is connected to the U-shaped fork 3d, the loading crossbar 3c is connected to the U-shaped fork 3d, and the ball joint 3b is hinged to the loading crossbar. On the rod 3c, the extension rod 3a is fixed on the end of the ball hinge 3b, and the end of the extension rod 3a is connected with the load loading device 6 . By installing the "U-shaped" of the U-shaped fork 3d along the Z direction, the main rotational freedom of the ball hinge 3b of the X-direction channel 3 is anti-Z swing around the Y-axis, and the secondary rotational freedom is around the Z-axis. Swing in Y direction. The use of the extension rod 3a further reduces the displacement of the coupling ball 2ba transmitted to the loading point of the actuator after the force swings, reduces the coupling effect after the Y and Z direction of the actuator is loaded, protects the actuator, and increases the Test accuracy.

Y-direction channel 4 is the same as X-direction channel 3. During installation, the "U-shaped" of the U-shaped fork 3d of the Y-direction channel 4 is installed along the X-direction, so that the main rotational freedom of the ball hinge 3b is anti-X-direction swing around the Z-axis, and the secondary rotational freedom is around the X-axis. Anti-Z swing.

Z-direction channel 5 is the same as X-direction channel 3. Different from the X-direction channel, the "U-shaped" of the U-shaped fork 3d is installed along the Y-direction, so that the main rotational freedom of the ball hinge 3b is anti-Y-direction swing around the X-axis, and the secondary rotational freedom is around the Y-axis, anti-X swing to.

The X-direction channel 3 is arranged along the X-direction, the Y-direction channel 4 is arranged along the Y-direction, and the Z-direction channel 5 is arranged along the Z-direction, as shown in FIG. The bracket 5c is fixed on the vertical large bracket 5a.

X-direction channel 3, Y-direction channel 4, Z-direction channel 5 The actuators are fixed by the actuator front bracket 3e and the actuator rear bracket 3f to avoid the existence of two joint bearing structures in a single channel, and the system will appear in the process of pushing risk of instability.

As shown in FIG. 6 , the load loading device 6 consists of a load loading sleeve 6a and a load loading end cover 6b. An empty groove is designed at the bottom of the load-loading sleeve 6a, and the coupling ball fixing block 6c is installed in the hollow groove, which is used to connect the trailer hook 2b, and the angle can be adjusted, so that the load-loading and the towing device of the RV are at different angles in the horizontal direction. The Y axis rotates to meet the R55 test items stipulated by European regulations. The schematic diagram of the R55 test device is shown in Figure 7. The load loading sleeve 6a is provided with connecting holes 6a2 on the end faces of the X, Y and Z directions respectively, which are respectively used to connect the X-direction channel 3, the Y-direction channel 4, and the Z-direction channel 5, see FIG. 8 .

The connecting ball fixing spacer 6c is composed of two symmetrical modules. As shown in FIG. 9 , after the two symmetrical modules are docked, a tow hook connection groove 6a1 is formed inside the coupling ball fixing pad 6c. The tow hook coupling slot 6a1 wraps the tow hook coupling ball 2b1, and the outer surface of the coupling ball is fixed to the pad 6c. 6c2 is in interference fit with the hollow groove on the bottom surface of the load loading sleeve 6a, and the side surface 6c3 of the connecting ball fixing pad 6c is in interference fit with the load loading end cover 6b. The connecting ball fixing pad 6c is made of a resin material with low rigidity and high wear resistance. The purpose is to increase the contact area between the test device and the coupling ball of the trailer hitch to avoid the actual contact being a line contact. At the same time, the loads in the three directions of X, Y, and Z are accurately loaded on the center point of the coupling ball, eliminating the offset of the loading point caused by improper processing and installation. In order to ensure the convenient operation during the installation process and control the clearance of the test device itself during the test process, the above two contact surfaces are interference fit. At the same time, the above structure can retain the rotational degrees of freedom around the Y-axis and the Z-axis between the trailer hitch coupling ball and the load loading sleeve 6a, as mechanical decoupling in the three-channel loading device.

The actuators of the X-direction channel, Y-direction channel and Z-direction channel are all hydraulic actuators, which provide X-direction load, Y-direction load and Z-direction load for the test bench respectively. The hydraulic actuator has an independent control system, with Displacement control, force control and other control methods. In addition, the hydraulic actuator has multi-channel iterative road spectrum and multi-channel software decoupling capability to reduce the coupling between multiple channels.

The control system of the hydraulic actuator can perform the road spectrum iteration, that is, starting from the "zero" load, the target load is progressively increased in any proportion of the target load (for example: 5% target load), so that the actual value acting on the sample is made. The load gradually approaches the target load. At the same time, the control system can write a program to control the hydraulic actuator to perform prescribed actions, and the test method of the present invention is completed by the internal program of the control system.

Example 2

A test method for a universal test bench for an RV traction device, comprising the following steps:

1. Before the sample is connected to the X, Y and Z channels, reset the actuator force sensor, and reset the actuator displacement sensor after connection;

2. The X-direction channel loads the load at a constant speed from 0 to the load extreme value in the road spectrum ±1.05*Fmax, and measures and records the X-direction channel load and X-direction channel displacement (displacement extreme value ±Xmax);

3. Calculate the stiffness of the body-in-white and the traction device in the X direction. If the stiffness is greater than 100,000 Nm/mm, skip step 4; if the stiffness is less than or equal to 100,000 Nm/mm, go to step 4;

4. Paste the X-direction strain gauge on the white body near the center point of the body mounting bolt;

5. Install the Z-direction displacement sensor at an angle of 45° 50mm from the center of the beam 2a and the center of the mounting bolts of the body (all eight installation points);

6. The X-direction channel loads the load at a constant speed from 0 to the load extreme value ±Fmax in the road spectrum, and measures and records the X-direction channel load, the X-direction channel displacement (displacement extreme value ±Xmax), the strain value of each strain gauge, and the displacement value of the displacement sensor. ;

7. Repeat step 6 for Z channel;

8. Determine whether the linearity of the X-direction channel load and displacement curve is greater than 0.995. If so, set the X-direction displacement protection to ±Xmax×1.08; if not, load the X-direction force to ±Fmax×1.12, and record the X-direction channel Displacement extreme value ±X2max, and set it as X-direction displacement protection value;

9. Determine whether the linearity of the relationship between the X-direction channel load and the strain value of each strain gauge in the X-direction is greater than 0.98. If so, you do not need to adjust the position of the strain gauge. If not, adjust the position of the strain gauge, re-paste it, and repeat steps 6 and 6. 9;

10. Repeat step 2, step 3, step 4, step 6, step 7, step 9 for Y channel;

11. Repeat steps 6, 7 and 9 for the Z channel;

12. Perform road spectrum iterations in sequence until the iterative accuracy of each road spectrum is greater than 97%;

13. Play the iterative spectrum once, measure and record the X-, Y-, and Z-direction channel load values, displacement sensor displacement values X1~X8, and strain gauge strain values σ1~σ16 during the test;

14. The iterative spectrum consists of 7 segments, numbered 1# to 7#. Play the iterative spectrum as shown in the control program 1, and record the displacement value of the displacement sensor and the strain value of the strain gauge in the latest iteration cycle when the test progresses to 30%, 50%, 70%, 80%, 90%, 95%, and 100%;

15. This step is performed synchronously with step 14, and it is judged whether the displacement value of the displacement sensor in step 14 is greater than (X1～X8)×1.2, if so, stop the test and carry out flaw detection inspection, if not, continue the test;

16. This step is carried out simultaneously with step 14, and judge whether the strain value of the strain gauge in step 14 is less than (σ1～σ16) × 0.6, if so, stop the test and carry out flaw detection, if not, continue the test;

17. Measure and record the X, Y, and Z channel load values of the last iterative spectrum cycle, and calculate the stiffness of the body-in-white + traction device in all directions after the test.

In the description of the present invention, unless otherwise expressly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms "up", "down", "left", "right" and other azimuth or positional relationships are based on the azimuth or positional relationship shown in the accompanying drawings, which are only for the convenience of description and simplifying operations. It is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first" and "second" are only used for distinction in description, and have no special meaning.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. A universal test bench for a RV traction device, characterized in that it comprises a RV traction device fixing bracket (1), an X-direction channel (3), a Y-direction channel (4), a Z-direction channel (5), a load loading device (6); The RV traction device fixing bracket (1) is used to fix the RV traction device (2) to be tested; the X-direction channel (3), the Y-direction channel (4), and the Z-direction channel (5) are respectively connected with the load loading device ( 6) Connection, X-direction channel (3) and Y-direction channel (4) are fixed on the ground horizontally and connected to the load loading device along X-direction and Y-direction respectively, Z-direction channel (5) is vertically fixed on the ground through brackets It is connected with the load loading device along the Z direction; the X-direction channel (3), the Y-direction channel (4), and the Z-direction channel (5) work together to load the resultant force on the load loading device (6). 2. The universal test bench for a RV traction device according to claim 1, wherein the load loading device (6) comprises a load loading sleeve (6a), and the bottom of the load loading sleeve (6a) is provided with a coupling ball The fixing block (6c) is used to hinge the traction device (2) of the RV under test; the load-loading sleeve (6a) is provided with connecting holes (6a2) on the end faces of the three directions of X, Y and Z, which are respectively used for connecting X-direction channel (3), Y-direction channel (4), Z-direction channel (5); a load-loading end cover (6b) is fixed at the rear end of the load-loading sleeve (6a). 3. A kind of universal test bench for RV traction device as claimed in claim 2, characterized in that, an empty groove is provided at the bottom of the load-loading sleeve (6a), and the coupling ball fixing pad (6c) is installed in the empty groove. ). 4. A kind of universal test bench for RV traction device as claimed in claim 3, characterized in that, a tow hook connecting groove (6a1) is formed inside the coupling ball fixing pad (6c), and the tow hook connecting groove (6a1) ) is used to wrap the trailer hitch coupling ball (2b1) of the RV towing device (2) to be tested and form a rotational connection. 5. The universal test bench for a RV traction device according to claim 3, wherein the outer surface of the coupling ball fixing pad (6c) is respectively connected with the bottom surface cavity and the load of the load loading sleeve (6a). Load the end cap (6b) with an interference fit. 6 . The universal test bench for a RV traction device according to claim 3 , wherein the coupling ball fixing pad ( 6c ) is formed by butting two symmetrical modules. 7 . 7. The universal test bench for a RV traction device according to claim 1, wherein the X-direction channel (3), the Y-direction channel (4), and the Z-direction channel (5) have the same structure, comprising: Actuator, extension rod (3a), ball joint (3b), loading bar (3c), U-shaped fork (3d), actuator front bracket (3e) and actuator rear bracket (3f); actuation The two ends of the actuator are respectively connected to the actuator front bracket (3e) and the actuator rear bracket (3f), the output end of the actuator is connected to the U-shaped fork (3d), and the loading crossbar (3c) is connected to the U-shaped fork (3c). 3d), the ball hinge (3b) is hinged on the loading crossbar (3c), the extension rod (3a) is fixed on the end of the ball hinge (3b), and the end of the extension rod (3a) is connected with the load loading device (6). 8 . The universal test bench for a RV traction device according to claim 7 , wherein the actuator is a hydraulic actuator. 9 . 9. The universal test bench for a RV traction device according to claim 1, wherein the RV traction device fixing bracket (1) is composed of two bracket mechanisms with the same structure, and the bracket mechanism comprises a tailstock (1a) ) and a support plate (1b), the tailstock (1a) is provided with a vertical long slot, the support plate (1b) is fixedly connected to the long slot on the tailstock (1a) by bolts, and the fixed position can be adjusted up and down ; The lower end face of the support plate (1b) is connected with the beam installation point of the traction device (2) of the RV to be tested through bolts. 10. the test method of a kind of RV traction device general test bench as claimed in claim 1, is characterized in that, comprises the following steps: S1. Sample installation: connect the test sample to the X-direction channel, Y-direction channel, and Z-direction channel, and reset the force sensor and displacement sensor of the actuator of each channel; S2, X-direction channel loading test: S21. The X-direction channel loads the load at a constant speed from 0 to the load extreme value in the road spectrum, and measures and records the X-direction channel load and X-direction channel displacement; S22. Calculate the stiffness in the X direction, if the stiffness does not exceed the preset value, paste the strain gauge in the X direction on the body-in-white; S23. Install a Z-direction displacement sensor on the traction device of the RV to be tested; S24. The X-direction channel loads the load at a constant speed from 0 to the load extreme value in the road spectrum, and measures and records the X-direction channel load and X-direction channel displacement; S25. The Z-direction channel loads the load at a constant speed from 0 to the load extreme value in the road spectrum, and measures and records the Z-direction channel load and Z-direction channel displacement; S26. Determine the linearity of the X-direction channel load-displacement relationship curve, and set the X-item displacement protection value; S27. Determine the linearity of the relationship between the X-direction channel load and the strain value of each strain gauge in the X-direction, and adjust the position of the strain gauge; S3, Y-direction channel loading test: the same as the steps S21, S22, S24, S25, S27; S4, Z-direction channel loading test: the same as the steps S24, S25, S27; S5, performing road spectrum iteration in sequence until the iterative precision of each road spectrum reaches a preset value; S6. Play the iterative spectrum, measure and record the channel load values in the X, Y, and Z directions during the test, the displacement values of the displacement sensor X1~X8, and the strain gauge strain values σ1~σ16; calculate the body-in-white and the traction device in all directions after the test stiffness.

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