CN110487506A - The peeling refitting of automobile balance is set - Google Patents

Abstract

The present invention relates to the device fields that tare weight is offset by zeroing, it is set more particularly to a kind of peeling refitting of automobile balance, including frame on balance and balance lower frame, it is equipped between frame and balance lower frame on the balance and removes tare weight lever mechanism, load cell and lock piece, it is described that remove tare weight lever mechanism include support, balanced lever and counterweight, the support is fixed in the upper surface of balance lower frame and holder top is equipped with the fulcrum connecting with balanced lever, the bottom of frame is connected with the connecting column connecting with balanced lever power arm on the balance, sliding sleeve is slidably connected on the resistance arm, the counterweight is fixedly connected on the bottom of sliding sleeve.It is tested using this programme for automobile wind direction, vehicle weight when can offset test on vertical direction, to achieve the effect that improve measurement sensitivity and save sensor to select cost.

Description

Automobile balance tare removal device

technical field

The invention relates to the field of devices for offsetting tare weight through zero adjustment, in particular to a tare weight removal device for automobile balances.

Background technique

The aerodynamic performance of the vehicle mainly considers the forces and moments in the longitudinal, transverse and vertical directions that the vehicle receives during driving. If these forces and moments are abnormally loaded on the car body, it will cause increased fuel consumption and Driving safety and stability are reduced, so that there are hidden dangers in driving safety.

In order to measure the aerodynamic performance of the vehicle, a six-component force balance system is commonly used to measure the force of the vehicle in the three directions of X, Y, and Z and the moments in the three directions of Mx, My, and Mz, that is, the vehicle longitudinal, The force state in the lateral and vertical directions is evaluated, and then the aerodynamic performance of the vehicle is evaluated, which has important reference significance for vehicle economy, driving stability and safety.

However, in the six-component force test, since the gravity of the vehicle is mixed in the Z direction, that is, the vertical direction, for example, in the experimental test, the force in the Mz direction planned to be measured is 500N, but the vehicle gravity in the vertical direction is 50000N. There is a huge gap between the gravity of the car body and the force to be measured, which reduces the measurement sensitivity of the sensor and the measurement result is inaccurate. If you want to measure accurate data, you have to use a more precise sensor, and this type of sensor is expensive. Thereby making the cost increase.

Contents of the invention

The invention intends to provide a tare weight removal device for an automobile balance to overcome the problems of low measurement sensitivity and high cost of measurement sensors in traditional methods.

To achieve the above object, the present invention provides the following technical solutions:

The automobile balance tare removal device comprises a balance upper frame and a balance lower frame, and a tare weight removal lever mechanism, a load cell and a locking member are arranged between the balance upper frame and the balance lower frame, and the tare weight removal lever mechanism It includes a support, a balance lever and a weight. The support is fixed on the upper surface of the lower frame of the balance and the top of the support is provided with a fulcrum connected with the balance lever. The fulcrum divides the balance lever into a power arm and a resistance arm. The bottom of the upper frame of the balance is fixedly connected with a connecting column connected to the power arm of the balance lever. A sliding sleeve is slidably connected to the resistance arm, and the weight is fixedly connected to the bottom of the sliding sleeve. Towing parts for weight pulling.

Principle of the present invention and beneficial effect:

(1) The weight of the vehicle in the vertical direction is offset by the tare lever mechanism, so that when the force in the vertical direction is measured, the load cell only needs to measure the force in the vertical direction due to the self-weight of the vehicle being offset. The force to be measured can be measured, thereby reducing the requirement on the sensitivity of the load cell used for measurement, thereby reducing the cost of equipment use.

(2) At the same time, compared with the traditional measurement method, the sensor needs to detect the vehicle's own gravity in the vertical direction and the force that needs to be measured in the vertical direction. However, the difference between the gravity of the vehicle and the force to be measured is relatively large, and the force tested is usually only 1% of the gravity of the vehicle, thereby reducing the sensitivity of the measurement and causing errors in the measured data. However, in this solution, after the self-gravity of the vehicle is offset, the load cell only needs to measure the force in the vertical direction, thereby improving the sensitivity of the measurement.

Compared with the traditional method, this scheme uses the tare weight lever mechanism to offset the vehicle's own weight in the vertical direction, so that the load cell does not need to measure the gravity on the one hand, saving the cost of selecting the sensor; on the other hand, due to the vertical The gravitational force in the vertical direction is cancelled, making the measurement more sensitive.

Further, the resistance arm of the balance lever is longer than the power arm.

Beneficial effect: It can be seen from the lever formula that by extending the length of the resistance arm, the effect of reducing the mass of the weight can be achieved. Compared with using a weight with a large mass, the cost of this solution is lower.

Further, a planar hydraulic bearing is arranged between the top of the connecting column and the upper frame of the balance.

Beneficial effect: reduce the parasitic force and friction force caused by mechanical deformation of the tare weight removal lever mechanism in use, reduce its influence on the force to be measured in the vertical direction, and thus improve the measurement sensitivity.

Further, a rotating hydraulic bearing is provided at the connection between the balance lever power arm and the connecting column.

Beneficial effect: reduce the parasitic force and friction force caused by mechanical deformation of the tare weight removal lever mechanism in use, reduce its influence on the force to be measured in the vertical direction, and then improve the sensitivity of measurement.

Further, an accommodating chamber for placing a load cell is provided between the balance upper frame and the balance lower frame, and the two ends of the load cell are respectively connected to the balance upper frame and the balance lower frame.

Beneficial effects: After the gravity of the vehicle is offset, the locking part is closed and the experimental test is started, so that the test force in the vertical direction can be directly transmitted to the load cell through the upper frame of the balance, thereby reducing the loss of force during transmission and improving The precision of the test.

Further, the upper surface of the upper frame of the balance is flush with the ground, the lower frame of the balance is pre-buried into the ground, and a protective shell is provided around the receiving chamber, and a protective layer is provided on the inner wall of the protective shell.

Beneficial effects: the lower frame of the balance is buried in the ground so that the upper frame of the balance is flush with the ground, thereby saving the occupied space. At the same time, the load cell in the accommodation cavity is protected against moisture and corrosion through the protective layer, thereby achieving the effect of protecting the load cell from damage and prolonging the service life of the device.

Further, the tare removal lever mechanism is provided with brakes.

Beneficial effects: after the two ends of the balance lever are balanced, the brakes are activated to lock and limit the weight, so that the weight will not shift again during the test, shortening the time for adjusting the weight, and at the same time The stability of the test is guaranteed, the frequency of repeated measurements is reduced, and the efficiency of the test is improved.

Further, a buffer layer is provided on the upper surface of the lower frame of the balance.

Beneficial effects: when the weight is not in use, the weight is in contact with the lower frame of the balance, reducing the collision between the weight and the lower frame of the balance, protecting the weight, and ensuring the sensitivity of measurement.

Further, the tare weight removal lever mechanism is arranged symmetrically with respect to the longitudinal axis of the upper frame of the balance.

Beneficial effects: the gravity of the vehicle is shared, and the length of the balance lever is avoided from being too long, which increases the production cost; meanwhile, the weight of the selected weight is also shared, thereby further ensuring the reliability of the device.

Further, the load cell is electrically connected with a display instrument.

Beneficial effect: the measured data is displayed, which is convenient for operators to understand the test situation.

Description of drawings

Fig. 1 is the longitudinal partial sectional view of the present embodiment one automobile balance tare removal device;

Fig. 2 is the axonometric view of the tare removal lever mechanism in Fig. 1;

Fig. 3 is an axonometric view of the connection between the lever and the connecting column in Fig. 1;

Figure 4 is a partial axonometric view of Figure 1;

Fig. 5 is a longitudinal partial sectional view of the tare-removing device for the automobile balance in the second embodiment.

Detailed ways

The following is further described in detail through specific implementation methods:

The reference signs in the drawings of the description include: balance upper frame 1, connecting column 101, bump 102, balance lower frame 2, tare weight lever mechanism 3, support 301, balance lever 302, weight 303, sliding sleeve 304 , rotating rod 305, load cell 4, locking member 5, rotary hydraulic bearing 6, plane hydraulic bearing 7, brake member 8, air pump 9, piston plate 901, piston rod 902, air intake check valve 903, air outlet single Directional valve 904, constriction section 905, throat section 906, divergence section 907.

Embodiment one:

The car balance tare removal device is basically shown in Figure 1, including the balance upper frame 1 and the balance lower frame 2. The balance lower frame 2 is pre-buried below the frozen soil line on the surface, and the wall is poured with concrete along the frozen soil layer. The upper frame 1 is flush with the ground, and the circumference of the balance lower frame 2 is provided with several threaded holes, and the threaded holes are all screwed with fastening bolts, and the balance lower frame 2 is fixedly connected with the concrete layer through the fastening bolts.

There is also an accommodation cavity between the balance upper frame 1 and the balance lower frame 2, a protective shell is fixedly connected to the surrounding side of the accommodation cavity, the top of the protective shell is flush with the ground, and the bottom of the protective shell is welded on the peripheral side of the balance lower frame 2 , the inner wall of the protective shell is provided with a vertical chute, the peripheral side of the frame 1 on the balance is fixedly connected with a slide block vertically slidingly connected with the chute, and the inner wall of the protective shell is coated with a protective layer.

As shown in Figure 4, a load cell 4 is placed in the accommodation cavity, the model is: LH-Z50, the rated range is 0-3t, the rated range in this embodiment is 5000N, the output sensitivity is 2.0±0.2Mv/v, the protection The grade is IP65, the working voltage is 2-10V, and the maximum working voltage is 15V. The output end is electrically connected with an RS485 interface, and the RS485 interface is electrically connected with the input end of the display, and the display in this embodiment is HKC-T7000. A buffer layer is bonded to the upper surface of the lower frame 2 of the balance, and a sponge layer is selected as the protective layer in this embodiment. And between the upper frame 1 of the balance and the lower frame 2 of the balance, there is a locking piece 5, the locking piece 5 is an electric strut, the specific model is: SKF-CAHB-10, the voltage is 12-24V, and the protection level is IP66. The ambient temperature is -40-85° C., and a locking controller electrically connected to the load cell 4 is provided on the electric strut.

The lower surface of the upper frame 1 of the balance is also provided with a circular groove, the plane hydraulic bearing 7 is fixedly connected in the groove, and the inner ring of the plane hydraulic bearing 7 is fixedly connected with a vertical connecting column 101 . As shown in FIG. 3 , the bottom of the connecting column 101 is integrally formed with a rectangular bump 102 , and a circular through hole is opened in the middle of the bump 102 , and the rotary hydraulic bearing 6 is fixedly connected in the through hole.

As shown in Fig. 1 and Fig. 4, a tare weight removal lever mechanism 3 is provided between the balance upper frame 1 and the balance lower frame 2. In this embodiment, two tare weight removal lever mechanisms 3 are provided. The vertical axis is symmetrically set. As shown in Fig. 2, the tare weight lever mechanism 3 includes a support 301, a balance lever 302 and a weight 303. In this embodiment, the quality of the weight is selected as 700kg-1000kg, and in this embodiment it is 800kg. The support 301 passes Fastening bolts are fixedly connected to the upper surface of the balance lower frame 2 , and the upper surface of the support 301 is provided with a fulcrum hinged with the balance lever 302 . The fulcrum divides the balance lever 302 into a resistance arm and a power arm. The length of the resistance arm is longer than the length of the power arm. The ratio of the resistance arm to the power arm is 4:1. Specifically, the length of the power arm is 2 meters, and the resistance arm is 8 meters. . The end of the power arm is integrally formed with a rotating rod 305 that is rotatably connected to the inner ring of the rotating hydraulic bearing 6 .

The resistance arm is also horizontally slidably connected with a sliding sleeve 304, and the upper part of the sliding sleeve 304 is fixedly connected with a traction piece for pulling the sliding sleeve 304. In this embodiment, the traction piece is a traction machine, and the specific model is: cw-m300/ For m500, the power supply is ac200V~ac220v, and the power is 400~450W. The weight 303 is fixedly connected to the bottom of the sliding sleeve 304, and the side of the sliding sleeve 304 away from the connecting column 101 is coaxially fixed with a sliding disk, and the sliding disk is clamped with a brake member 8 for braking the weight 303. In the example, the brake part 8 is a motor brake deceleration motor, the specific model is: GONGJI-SVB18, the rated voltage is 220V, and the rated power is 100W-370W. The brake member 8 is provided with a brake controller electrically connected to the force sensor 4, the specific model is: AMP-35W, before opening the lock body, when the force sensor 4 does not detect force fluctuations, it means that the weight 303 will The gravity of the vehicle is offset. At this moment, the electric signal is transmitted to the brake controller of the brake part 8 through the load cell 4, and the brake part 8 brakes the weight 303 through the brake controller, so that the weight 303 no longer slides on the resistance arm .

The specific implementation process is as follows:

Before the test, the force sensor 4 sends an electric signal to the locking controller, and the locking member 5 is locked by the locking controller, so that the distance between the balance upper frame 1 and the balance lower frame 2 remains unchanged. Push the car to be tested onto the upper frame 1 of the balance. After the vehicle is pushed onto the upper frame 1 of the balance, the force on one side of the power arm increases, and the force sensor 4 sends an electric signal to the weight 303. The brake controller controls and closes the brake part 8 on the weight 303 through the brake controller, so that the weight 303 slides on the resistance arm, and finally balances the force on both ends of the balance lever 302, thereby offsetting the gravity of the car through the weight 303, To achieve the purpose that the gravity of the vehicle will not be affected by the test. When the force on both ends of the lever is balanced, the load sensor 4 receives the sensed force fluctuation to be 0. At this moment, the load cell 4 transmits an electric signal to the brake controller of the brake part 8, thereby controlling the brake part 8 to brake and control the weight. The code 303 no longer slides, and then sends an electric signal to the locking controller through the load cell 4 to close the locking member 5, so that the upper frame 1 of the balance can slide vertically when it is under force, so that the force measuring When the sensor 4 is measuring, the force in the vertical direction is only the force to be tested, so that the measurement sensitivity of the load cell 4 is greatly improved. At the same time, since the gravity of the vehicle is offset, the selection range of the load cell 4 is larger, thereby reducing the cost of purchasing the load cell 4 .

At the same time, during the measurement process, the parasitic force and friction force caused by mechanical deformation between the tare lever parts are eliminated by the plane hydraulic bearing 7 and the rotary hydraulic bearing 6, thereby further improving the sensitivity of the load cell 4 .

Embodiment two:

Embodiment 2 is different from Embodiment 1 in that: as shown in FIG. 5 , an air pump 9 is fixedly connected to the lower frame 2 of the balance through fastening bolts, and a piston plate 901 is vertically slidably connected in the air pump 9, and the piston The top of the plate 901 is welded with a vertical piston rod 902. The piston rod 902 vertically penetrates the top of the pump 9 and is welded with the bottom surface of the upper frame 1 of the balance. The piston rod 902 is vertically slidably matched with the pump 9. The left side of the lower part of the air pump 9 is connected with an air intake pipe, and the air intake pipe is provided with an air intake check valve 903. When the air pressure in the air intake pipe is greater than the air pressure in the air pump 9, the gas enters the air pump 9 from the air intake pipe. The other end of the air intake pipe is connected to the air box placed on the ground surface; the right side of the bottom of the air pump 9 is connected with an air outlet pipe, and the air outlet pipe is provided with an air outlet check valve 904. When the air pressure in the air pump 9 is greater than that in the air outlet pipe When the air pressure is low, the gas in the pump 9 is discharged from the pump 9 to the air outlet pipe, the other end of the air outlet pipe is connected with an air pump, and the air outlet end of the air pump is connected with a dust removal pipe. Section 907, and the throat section 906 connects the diverging section 907 and the constricting section 905. The side wall of the throat section 906 is provided with dust holes. The diffuser section 907 is in communication with the vacuum cleaner placed on the ground surface.

The specific implementation process is as follows:

The lower frame 2 of the balance drives the piston rod 902 to move down, the gas in the pump 9 is pressed into the air pump through the piston rod 902, and the high-pressure gas is delivered to the dust removal pipe through the air pump, the gas enters from the contraction section 905, and is discharged from the diffusion section 907, and A negative pressure is formed at the throat section 906 , and under the action of the negative pressure, the dust in the accommodating cavity is adsorbed through the dust holes.

Embodiment three:

The difference between the third embodiment and the second embodiment is that the dust removal pipe is provided with multiple sections, and the diffusion section 907 in each section of the dust removal pipe communicates with the constriction section 905 of the adjacent dust removal section. Therefore, the dust collection rate in the accommodating cavity is improved.

Claims (10)

1. Automobile balance tare removal device, it is characterized in that: comprise balance upper frame and balance lower frame, between described balance upper frame and balance lower frame, be provided with tare weight removal lever mechanism, load cell and locking piece, so The tare lever mechanism includes a support, a balance lever and a weight. The support is fixedly connected to the upper surface of the lower frame of the balance and the top of the support is provided with a fulcrum connected with the balance lever. The fulcrum divides the balance lever into a power arm With the resistance arm, the bottom of the upper frame of the balance is fixedly connected with the connecting column connected with the power arm of the balance lever, the sliding sleeve is slidably connected to the resistance arm, the weight is fixedly connected to the bottom of the sliding sleeve, and the balance The lever is provided with a traction member for traction of the weight. 2. The tare-removing device for automobile balances as claimed in claim 1, wherein the resistance arm of the balance lever is longer than the power arm. 3. The tare-removing device for the automobile balance according to claim 2, characterized in that: a plane hydraulic bearing is arranged between the top of the connecting column and the upper frame of the balance. 4. The tare-removing device for the automobile balance according to claim 3, characterized in that: a rotary hydraulic bearing is arranged at the joint between the power arm of the balance lever and the connecting column. 5. The automobile balance tare removal device as claimed in claim 4, characterized in that: an accommodating chamber for placing a load cell is also provided between the balance upper frame and the balance lower frame, and the two load cells of the load cell The ends are respectively connected to the upper frame of the balance and the lower frame of the balance. 6. The automobile balance tare removal device as claimed in claim 5, characterized in that: the upper surface of the balance upper frame is flush with the ground, the balance lower frame is pre-buried into the ground, and the surrounding side of the accommodating cavity is provided with There is a protective shell, and the inner wall of the protective shell is provided with a protective layer. 7. The tare removal device for automobile balance according to claim 6, characterized in that: the tare removal lever mechanism is provided with a brake. 8. The tare-removing device for automobile balance according to claim 7, characterized in that: a buffer layer is provided on the upper surface of the lower frame of the balance. 9. The tare weight removal device for the automobile balance according to claim 8, characterized in that: the tare weight removal lever mechanism is arranged symmetrically with respect to the longitudinal axis of the balance upper frame. 10. The tare-removing device for an automobile balance as claimed in claim 9, characterized in that: said load cell is electrically connected with a display.