An automatic adjustment gantry for white body modal testing and an adjustment method thereof

Abstract

The present invention discloses an automatically adjustable gantry for white body modal testing and an adjustment method. It includes a frame, two movable crossbeams symmetrically and longitudinally slidably connected to the frame, and four electric hoists symmetrically and transversely slidably connected to the movable crossbeams; it further includes a displacement sensor for measuring the longitudinal movement distance of the movable crossbeam on the frame; an electric hoist displacement sensor for measuring the transverse movement distance of the electric hoist on the movable crossbeam; a height sensor for measuring the height of the electric hoist; and a control module for determining the height of lifting the white body according to the longitudinal movement distance of the movable crossbeam on the frame, the transverse movement distance of the electric hoist on the movable crossbeam, and the height of the electric hoist. The present invention has a wide range of applications and is applicable to white bodies of different sizes and structures. The present invention is easy to operate, the gantry can be simply and conveniently lifted automatically, reducing the safety risks during the test and improving the test efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of white body modal testing, and particularly relates to an automatically adjustable gantry for white body modal testing and an adjustment method. Background Art

[0002] Currently, in the field of vehicle body design, passenger vehicle bodies mostly adopt a load-bearing design, which almost bears all torsional and bending loads. The mode of the vehicle body will directly affect various key indicators of the vehicle body, such as the NVH performance of the vehicle body.

[0003] In current white body modal tests, it is necessary to lift the white body. Since the size and structure of the white body of each vehicle model are different, the lifting positions and postures are different, and several electric hoists need to be lifted synchronously during lifting. Otherwise, the heights of each lifting point will be different, resulting in the vehicle body being side-offset and prone to accidents. Therefore, each lifting is very troublesome. Therefore, it is very necessary to design a gantry that can automatically adjust the positions of the cross beam and electric hoist and the lifting height and automatically lift the white body.

[0004] For example, in the patent CN201711076922.0 "An Automotive Component Modal Testing Support System", an automotive component modal testing support system with high measurement accuracy, adjustable natural frequency and stiffness is invented. The support system consists of a gantry, an electric hoist, a gas spring, a jack, etc.; the electric hoist provides a vertical lifting point for suspended modal testing, and the supporting fine-tuning device enables the tested part to maintain a basic horizontal state during testing. The spring assembly can change its own stiffness by adjusting the series and parallel connection of the springs; the gas spring provides a horizontal resting point for resting modal testing, and the supporting jack enables the tested part to maintain a basic horizontal state during testing. The gas spring can change its own stiffness by adjusting the inflation pressure according to different tested parts, and can accurately control the temperature of the gas spring itself, improving the measurement accuracy.

[0005] However, the above-mentioned prior art solutions have the following defects:

[0006] 1. In the prior art, the lifting process requires manual control of the lifting and lowering of the electric hoist. Four electric hoists used to lift the white body need to be operated by multiple people at the same time. Improper cooperation is likely to result in different heights of several lifting points, leading to uneven force and accidents. The operation process is complex and troublesome, and there are safety hazards.

[0007] 2. In the prior art, the installation positions of the cross beam and electric hoist are fixed, and there may be a problem of size mismatch for white bodies of different sizes. Summary of the Invention

[0008] The purpose of the present invention is to solve the deficiencies existing in the above background art, and provide an automatically adjustable gantry for white body modal testing and an adjustment method.

[0009] The technical solution adopted by the present invention is as follows: An automatic-adjusting gantry for white body modal testing, comprising a frame, two movable crossbeams symmetrically and longitudinally slidably connected to the frame, and four electric hoists symmetrically and transversely slidably connected to the movable crossbeams; further comprising

[0010] a displacement sensor for measuring the longitudinal movement distance of the movable crossbeam on the frame;

[0011] an electric hoist displacement sensor for measuring the transverse movement distance of the electric hoist on the movable crossbeam;

[0012] a height sensor for measuring the height of the electric hoist;

[0013] a control module for determining the lifting height of the white body according to the longitudinal movement distance of the movable crossbeam on the frame, the transverse movement distance of the electric hoist on the movable crossbeam, and the height of the electric hoist.

[0014] The longitudinal distance between the left front lifting point and the left rear lifting point of the white body or between the right front lifting point and the right rear lifting point is a, the transverse distance between the left front lifting point and the right front lifting point of the white body is b1, the transverse distance between the left rear lifting point and the right rear lifting point of the white body is b2, the height of the left front lifting point or the right front lifting point of the white body is c2, the height difference between the right rear lifting point and the right front lifting point or between the left rear lifting point and the left front lifting point of the white body is c1, and the required lifting height of the white body is d; a, b1, b2, c1, c2, d satisfy the following relationships: X1 = X2 = a / 2, Y1 = Y3 = (A - b1) / 2, Y2 = Y4 = (A - b2) / 2, Z1 = Z3 = d + c2, Z2 = Z4 = d + c2 + c1, where A is the total stroke of the electric hoist on the movable crossbeam, X1 and X2 are the longitudinal movement distances of the two movable crossbeams relative to the transverse center line of the frame respectively, Y1, Y2, Y3, and Y4 are the transverse movement distances of the four electric hoists relative to the longitudinal center line of the frame respectively, and Z1, Z2, Z3, and Z4 are the heights of the four electric hoists respectively.

[0015] By controlling these parameters, the consistency of parameters such as the lifting position, height, and force direction during each hoisting is ensured, the errors brought by boundary conditions to the test are eliminated, and the test accuracy is improved. By controlling these parameters, the gantry can be adapted to white bodies of different sizes, and the applicable range of the gantry is expanded. By controlling these parameters, the automatic lifting of the white body can be realized, and problems such as unstable lifting during the hoisting process caused by unstable manual operation can be avoided.

[0016] For a further preferably structure, the value range of A is 3 - 4.5 m.

[0017] A further preferred structure, the electric hoist includes an electric hoist body, an electric hoist suspension structure, an electric hoist drive motor for driving the electric hoist suspension structure, a chain, and a hook. The electric hoist body is suspended on a movable crossbeam through the electric hoist suspension structure, and the hook is arranged at the bottom of the electric hoist body through the chain.

[0018] A further preferred structure, the inside of the electric hoist suspension structure is connected to the movable crossbeam through a second roller, and the electric hoist drive motor is used to drive the second roller to rotate so that the electric hoist moves horizontally on the movable crossbeam.

[0019] A further preferred structure, the electric hoist displacement sensor is arranged on the electric hoist suspension structure.

[0020] A further preferred structure, the height sensor is arranged on the hook.

[0021] A further preferred structure, the frame includes multiple crossbeams, longitudinal beams, vertical beams, connecting seats, and diagonal bracing beams for strengthening. The connecting seats are fixed on the iron floor through bolts, and the crossbeams, longitudinal beams, and vertical beams form the overall structure of the gantry.

[0022] A further preferred structure, the two movable crossbeams are arranged at intervals, and the two ends of the two movable crossbeams are respectively fixed on the crossbeam support structure. The crossbeam support structure is slidably connected to the symmetrically arranged guide rails on the top of the frame through the first rollers arranged at the bottom. The movable crossbeam is driven by a drive motor, and the displacement sensor is arranged on the movable crossbeam.

[0023] An adjustment method for an automatically adjustable gantry for white body modal testing: includes the following steps:

[0024] (1), Connect the electric hoist hook to the corresponding lifting points at the four corners of the white body through a tooling, and measure the relative distances a, b1, b2, c1, c2 of the four lifting points of the white body;

[0025] (2), Input the relative distances a, b1, b2, c1, c2 of the four lifting points of the white body and the expected lifting height d of the white body into the control system through the control panel;

[0026] (3), Calculate that when the white body is lifted to a suitable position, the moving distances of each mechanism are: the displacements of the two movable crossbeams moving to the specified positions are: X1 = X2 = a / 2; the displacements of the hooks moving to the specified positions are: Y1 = Y3 = (A - b1) / 2, Y2 = Y4 = (A - b2) / 2; the heights of the hooks to the specified positions are: Z1 = Z3 = d + c2, Z2 = Z4 = d + c2 + c1;

[0027] (4) The control system controls the driving motor, and the electric hoist driving motor drives the movable crossbeam and the electric hoist hook to act. When the position parameters of the movable crossbeam and the electric hoist hook reach the input parameter values, the driving stops, and the white body is lifted to the set position.

[0028] The present invention mainly realizes the automatic lifting function of the gantry for white bodies of different sizes. The automatic lifting function of the white body can be realized. The tester only needs to hang the hook on the corresponding lifting points of the white body in a certain way, input the size parameters of the white body, the lifting height and other parameters into the control system, and the system will control the crossbeam and the electric hoist to move to the appropriate positions and control the electric hoist to lift, ensuring that the white body is always in a horizontal state until it is lifted to the set height. By moving the crossbeam and the electric hoist, white bodies of different sizes can be matched.

[0029] The present invention has a wide range of applications and is applicable to white bodies of different sizes and structures. The operation of the present invention is simple. Only by inputting the relevant size parameters, the gantry can automatically lift simply and conveniently, reducing the safety risks during the test and improving the test efficiency. The attitude boundary of each hoisting of the present invention can be made consistent, eliminating the errors brought by the boundary conditions to the test and improving the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of the present invention;

[0031] Figure 2 is a schematic layout diagram of the movable crossbeam of the present invention on the frame;

[0032] Figure 3 is a schematic layout diagram of the movable crossbeam of the present invention on the frame;

[0033] Figure 4 is a schematic structural diagram of the chain and hook of the present invention;

[0034] Figure 5 is a side view of the present invention;

[0035] Figure 6 is a top view of the present invention;

[0036] Figure 7 is a schematic diagram of the lifting height of the white body of the present invention;

[0037] Figure 8 is a flowchart of the operation of the present invention.

[0038] In the figure, 1 - connecting seat, 2 - vertical beam, 3 - longitudinal beam, 4 - diagonal bracing beam, 5 - cross beam, 6 - movable cross beam, 7 - driving motor, 8 - displacement sensor, 9 - cross beam support structure, 10 - electric hoist driving motor, 11 - electric hoist displacement sensor, 12 - electric hoist suspension structure, 13 - control circuit, 14 - control box, 15 - control panel, 16 - chain, 17 - height sensor, 18 - hook, 19 - guide rail, 20 - first roller, 21 - second roller, 22 - bolt, 23 - electric hoist body. Detailed implementation manner

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, which is convenient for clearly understanding the present invention, but they do not constitute a limitation to the present invention.

[0040] As shown in the present invention Figure 1 An automatic adjustment gantry for white body modal testing includes a frame, 2 movable cross beams, 4 electric hoists, and a control system. The frame is composed of a cross beam 5, a longitudinal beam 3, a vertical beam 2, a connecting seat 1 and a diagonal bracing beam 4 for strengthening. The connecting seat 1 is fixed on the iron floor with bolts. The cross beam 5, the longitudinal beam 3 and the vertical beam 2 form the overall structure of the gantry.

[0041] As shown in Figure 2 The movable cross beam 6 is composed of an I-beam cross beam, a cross beam support structure 9, a driving motor 7, and a displacement sensor 8. The end of the movable cross beam 6 is welded to the cross beam support structure 9. The lower part of the cross beam support structure 9 is installed on the guide rail 19 of the longitudinal beam of the frame through a roller 20. The driving motor 7 can drive the roller 20 to rotate, so that the cross beam 6 moves longitudinally on the frame. The displacement sensor 8 is installed at the end of the cross beam support structure 9 and can measure its longitudinal movement distance on the gantry frame.

[0042] As shown in Figure 3 , Figure 4 The electric hoist is composed of an electric hoist body 23, an electric hoist suspension structure 12, an electric hoist driving motor 10, a chain 16, a hook 18, an electric hoist displacement sensor 11 and a height sensor 17. The electric hoist body 23 is suspended on the movable cross beam 6 through the electric hoist suspension structure 12. The electric hoist body 23 is fixed to the electric hoist suspension structure 12 with bolts 22. The inside of the electric hoist suspension structure 12 is connected to the movable cross beam 6 through a second roller 21. The electric hoist driving motor 10 can drive the second roller 21 to rotate, so that the electric hoist moves horizontally on the movable cross beam 6. The electric hoist displacement sensor 11 is installed on the side of the electric hoist suspension structure 12 and can measure the horizontal movement distance of the electric hoist on the movable cross beam 6. The height sensor 17 is installed on the hook 18 and can measure the height of the hook 18.

[0043] Among them, a displacement sensor 8 is used to measure the longitudinal movement distance of the movable crossbeam 6 on the frame; a hoist displacement sensor 11 is used to measure the transverse movement distance of the hoist on the movable crossbeam 6; a height sensor 17 is used to measure the height of the hoist; and a control module is further included, which is used to determine the lifting height of the white body according to the longitudinal movement distance of the movable crossbeam 6 on the frame, the transverse movement distance of the hoist on the movable crossbeam 6, and the height of the hoist.

[0044] The longitudinal distance between the left front lifting point and the left rear lifting point or between the right front lifting point and the right rear lifting point of the white body is a, the transverse distance between the left front lifting point and the right front lifting point of the white body is b1, the transverse distance between the left rear lifting point and the right rear lifting point of the white body is b2, the height of the left front lifting point or the right front lifting point of the white body is c2, the height difference between the right rear lifting point and the right front lifting point or between the left rear lifting point and the left front lifting point of the white body is c1, and the required lifting height of the white body is d; a, b1, b2, c1, c2, d satisfy the following relationships: X1 = X2 = a / 2, Y1 = Y3 = (A - b1) / 2, Y2 = Y4 = (A - b2) / 2, Z1 = Z3 = d + c2, Z2 = Z4 = d + c2 + c1, where A is the total stroke of the hoist on the movable crossbeam 6, X1 and X2 are the longitudinal movement distances of the two movable crossbeams 6 relative to the transverse center line of the frame respectively, Y1, Y2, Y3, and Y4 are the transverse movement distances of the four hoists relative to the longitudinal center line of the frame respectively, and Z1, Z2, Z3, and Z4 are the heights of the four hoists respectively.

[0045] The value range of A is 3 - 4.5 m.

[0046] The control system consists of a control line 13, a control box 14 (with a control module installed inside), and a control panel 15. The operator can input relevant parameters through the control panel 15. The control box 14 sends signals to the corresponding drive motors through the control line 13 for driving. The control box 14 can also receive the position information fed back by the sensors for adjustment. When the position parameters of the movable crossbeam 6, the hoist, or the hook fed back by the sensors reach the input parameter values, the driving is stopped and locked. At this time, the white body is also lifted to the set position.

[0047] As Figure 2 shown, a guide rail 19 is installed on the longitudinal beam 3. The crossbeam support structure 9 is installed on the guide rail of the longitudinal beam 3 through the rollers 20 inside it. The drive motor 7 can drive the first roller 20 to enable the support structure to drive the movable crossbeam 6 to move longitudinally on the longitudinal beam 3. Displacement sensors 8 are installed at both ends of the crossbeam support structure 9 to measure its longitudinal movement distance X. The hoist body 23 is connected to the crossbeam support structure 9 through bolts 22. The crossbeam support structure 9 is supported on the T-shaped groove movable crossbeam 6 through the second rollers 21, and its cross-sectional structure is as Figure 4As shown in the figure, the electric hoist driving motor 10 can drive the second roller 21 to rotate, thereby driving the electric hoist to move horizontally on the movable crossbeam 6. A displacement sensor 11 is installed on the side of the crossbeam support structure 9, which can measure the horizontal moving distance Y of the electric hoist. A height sensor 17 is installed on the hook 18, which can measure the height Z of the hook 18.

[0048] One embodiment of the dimensions of the gantry of the present invention in terms of length, width, and height: the length, width, and height are 7×3.5×4.5 m respectively. At this time, the total stroke of the movable crossbeam 6 on the frame is 3.5 m. The distances X1 and X2 that the two movable crossbeams 6 move defined in the control system are as Figure 5 shown, and the moving distances Y1, Y2, Y3, and Y4 of the four electric hoists are as Figure 6 shown, and the lifting heights Z1, Z2, Z3, and Z4 of the four hooks are as Figure 5 shown.

[0049] Combined with Figure 8 shown, the specific operation process of the present invention is as follows:

[0050] 1. Connect the electric hoist hook 18 to the corresponding lifting points at the four corners of the white body through a tooling, and measure the relative distances a, b1, b2, c1, and c2 of the four lifting points of the white body, as Figure 7 shown;

[0051] 2. Input the relative distances a, b1, b2, c1, and c2 of the four lifting points of the white body and the expected lifting height d into the control system through the control panel;

[0052] 3. From this calculation, when the white body is lifted to the appropriate position, the moving distances of each mechanism are as follows: the displacements of the two movable crossbeams 6 moving to the specified positions are: X1 = X2 = a / 2; the displacements of the electric hoist driving the hook 18 moving to the specified positions are: Y1 = Y3 = (3.5 - b1) / 2, Y2 = Y4 = (3.5 - b2) / 2; the heights of the hook 18 to the specified positions are: Z1 = Z3 = d + c2, Z2 = Z4 = d + c2 + c1;

[0053] 4. The control box 14 sends signals to the corresponding driving motors through the control lines for driving. The control box can also receive the position information fed back by the sensors for adjustment. When the position parameters of the movable crossbeam 6 and the electric hoist hook 18 reach the input parameter values, the driving is stopped, and the white body is also lifted to the set position.

[0054] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

Claims

1. An automatic adjustment gantry for white body modal testing, characterized in that: It includes a frame, two symmetrically longitudinally slidably connected movable crossbeams (6) on the frame, and four symmetrically transversely slidably connected electric hoists on the movable crossbeams (6); it also includes a displacement sensor (8) for measuring the longitudinal movement distance of the movable crossbeam (6) on the frame; an electric hoist displacement sensor (11) for measuring the transverse movement distance of the electric hoist on the movable crossbeam (6); a height sensor (17) for measuring the height of the electric hoist; a control module for determining the lifting height of the white body according to the longitudinal movement distance of the movable crossbeam (6) on the frame, the transverse movement distance of the electric hoist on the movable crossbeam (6), and the height of the electric hoist; The longitudinal distance between the left front lifting point and the left rear lifting point of the white body or between the right front lifting point and the right rear lifting point is a, the transverse distance between the left front lifting point and the right front lifting point of the white body is b1, the transverse distance between the left rear lifting point and the right rear lifting point of the white body is b2, the height of the left front lifting point or the right front lifting point of the white body is c2, the height difference between the right rear lifting point and the right front lifting point or between the left rear lifting point and the left front lifting point of the white body is c1, and the required lifting height of the white body is d; a, b1, b2, c1, c2, d satisfy the following relationships: X1 = X2 = a / 2, Y1 = Y3 = (A - b1) / 2, Y2 = Y4 = (A - b2) / 2, Z1 = Z3 = d + c2, Z2 = Z4 = d + c2 + c1, where A is the total stroke of the electric hoist on the movable crossbeam (6), X1 and X2 are the longitudinal movement distances of the two movable crossbeams (6) relative to the transverse center line of the frame respectively, Y1, Y2, Y3, Y4 are the transverse movement distances of the four electric hoists relative to the longitudinal center line of the frame respectively, and Z1, Z2, Z3, Z4 are the heights of the four electric hoists respectively; The adjustment method of the automatic adjustment gantry for white body modal testing includes the following steps: (1). Connect the electric hoist hook (18) to the corresponding lifting points at the four corners of the white body through a tooling, and measure the relative distances a, b1, b2, c1, c2 of the four lifting points of the white body; (2). Input the relative distances a, b1, b2, c1, c2 of the four lifting points of the white body and the expected lifting height d of the white body into the control system through the control panel; (3). Calculate the movement distances of each mechanism when the white body is lifted to a suitable position: the displacements of the two movable crossbeams (6) moving to the specified positions are: X1 = X2 = a / 2; the displacements of the hooks (18) moving to the specified positions are: Y1 = Y3 = (A - b1) / 2, Y2 = Y4 = (A - b2) / 2; the heights of the hooks (18) to the specified positions are: Z1 = Z3 = d + c2, Z2 = Z4 = d + c2 + c1; (4). The control system controls the driving motor (7) and the electric hoist driving motor (10) to drive the movable crossbeam (6) and the electric hoist hook (18) to act. When the position parameters of the movable crossbeam (6) and the electric hoist hook (18) reach the input parameter values, stop driving, and the white body is lifted to the set position.

2. The automatic adjustment gantry for white body modal testing according to claim 1, wherein: The value range of A is 3 - 4.5m.

3. The automatic adjustment gantry for white body modal testing according to claim 1, wherein: The electric hoist includes an electric hoist body (23), an electric hoist suspension structure (12), an electric hoist drive motor (10) for driving the electric hoist suspension structure (12), a chain (16), and a hook (18). The electric hoist body (23) is suspended on a movable crossbeam (6) through the electric hoist suspension structure (12), and the hook (18) is arranged at the bottom of the electric hoist body (23) through the chain (16).

4. The automatic adjustment gantry for white body modal testing according to claim 3, wherein: Inside the electric hoist suspension structure (12), it is connected to the movable crossbeam (6) through a second roller (21). The electric hoist drive motor (10) is used to drive the second roller (21) to rotate so that the electric hoist moves horizontally on the movable crossbeam (6).

5. The automatic adjustment gantry for white body modal testing according to claim 3, characterized in that: The electric hoist displacement sensor (11) is arranged on the electric hoist suspension structure (12).

6. The automatic adjustment gantry for white body modal testing according to claim 3, wherein: The height sensor (17) is arranged on the hook (18).

7. The automatic adjustment gantry for white body modal testing according to claim 1, characterized in that: The frame includes multiple crossbeams (5), longitudinal beams (3), vertical beams (2), connection seats (1), and diagonal bracing beams (4) for strengthening. The connection seats (1) are fixed to the iron floor by bolts, and the crossbeams (5), longitudinal beams (3), and vertical beams (2) form the overall structure of the gantry.

8. The automatic adjustment gantry for white body modal testing according to claim 1, wherein: Two of the movable crossbeams (6) are arranged at intervals, and both ends of the two movable crossbeams are respectively fixed to the crossbeam support structure (9). The crossbeam support structure (9) is slidably connected to the symmetrically arranged guide rails (19) on the top of the frame through the first rollers (20) arranged at the bottom; the movable crossbeam (6) is driven by a drive motor (7), and the displacement sensor (8) is arranged on the movable crossbeam (6).

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