Loading force calibration device for drum testing machine

Abstract

The utility model provides a drum testing machine loading force calibration device which comprises a tray, the tray is of an arc-shaped structure with an opening in the upper portion, the right end of the tray is connected with a sensor, a jacking rod is arranged above the tray, the jacking rod and the tray are coaxially arranged, the right end of the jacking rod is in contact connection with the sensor, and the right end of the jacking rod is in contact connection with the sensor. The side wall of the tray is in threaded connection with a plurality of adjusting screws, and the adjusting screws penetrate through the tray from outside to inside and then are in contact connection with the jacking rods. The device can safely and stably calibrate the pressure sensor of the testing machine within the calibration range of 25-150 tons, no tire is used, the cost is reduced, and the probability of potential accidents is reduced.

Description

Technical Field

[0001] The utility model relates to the field of tire production equipment, in particular to a loading force calibration device for a drum testing machine. Background Technique

[0002] After the vulcanization of giant meridian tires, durability tests and indentation tests need to be carried out on a drum testing machine and a durability testing machine. At this time, the accuracy of the loading force directly determines the success or failure of the test. The loading force ranges from 30 tons to 100 tons to meet the loading requirements of different specifications. Therefore, it is necessary to regularly calibrate the loading force of the testing machine, and the calibration range is 25 - 150 tons. The initial calibration method is to install a pressure sensor that has passed professional inspection and certification on the indentation plate, install a giant meridian tire on the test shaft, use a traveling crane to lift a 50 mm steel plate and place it between the tire and the sensor, and the testing machine pressurizes to make the tire press on the steel plate, and the force is transmitted to the pressure sensor through the steel plate, and the loading force of the testing machine is calibrated by comparing the pressure values of the two. However, such an operation has the following deficiencies:

[0003] 1) The force measurement is inaccurate. Since the force-bearing area of the pressure sensor is much smaller than the tire cross-section, the elastic deformation of the steel plate itself will offset part of the loading force of the tire, resulting in data distortion.

[0004] 2) The giant meridian tire cannot be loaded to 150 tons and can only be pressurized within its safe force-bearing range (maximum 100 tons). The linear value of the calibrated sensor will deviate from the actual value. If it must be loaded to 150 tons, then the tire can only be scrapped and cannot enter the market, and the calibration cost will increase significantly.

[0005] 3) Excessive loading force will lead to the risk of tire explosion, posing potential safety hazards to personnel and equipment. Content of the Utility Model

[0006] In view of the above problems, the utility model provides a loading force calibration device for a drum testing machine. This device can safely and stably calibrate the pressure sensor of the testing machine within the calibration range of 25 - 150 tons, without using tires, reducing costs and reducing the probability of potential accidents.

[0007] A loading force calibration device for a drum testing machine includes a tray. The tray is an arc-shaped structure with an open upper part. The right end of the tray is connected to a pressure sensor. A tightening rod is arranged above the tray. The tightening rod is coaxially arranged with the tray. The right end of the tightening rod is in contact connection with the pressure sensor. A plurality of adjusting screws are threadedly connected to the side wall of the tray. The adjusting screws penetrate the tray from the outside to the inside and are in contact connection with the tightening rod.

[0008] Preferably, the left end of the tightening rod is provided with an arc-shaped end surface that contacts the test shaft surface.

[0009] Preferably, the length of the tray is less than that of the jacking rod.

[0010] Preferably, the upper opening of the tray is 210°.

[0011] Preferably, the end of the adjusting screw in contact with the jacking rod is spherical.

[0012] Preferably, the adjusting screws are arranged at intervals along the circumferential direction of the arc surface of the tray.

[0013] Preferably, the adjusting screw is provided with a set screw nut, and the set screw nut is arranged on the outer side surface of the tray.

[0014] Preferably, the right end of the tray is connected with a chassis, the left side surface of the chassis is fixedly connected with a pressure sensor, and the right side surface of the chassis is in contact connection with the drum.

[0015] Preferably, a reinforcing rib is arranged between the tray and the chassis.

[0016] Preferably, a lifting ring is arranged above the jacking rod.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] By setting the tray, the jacking rod and the adjusting screw, the present utility model replaces the technical solution of calibrating the drum by using a tire in the prior art. The jacking rod has high rigidity and strong versatility. The tray can effectively limit the circumferential position of the jacking rod to prevent the jacking rod from shifting. The whole device effectively solves the technical problems such as tire damage, data distortion and potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is the front view of the overall structure of the present utility model;

[0021] Figure 2 is Figure 1 the A-A sectional view in

[0022] Figure 3 is the top view of the overall structure of the present utility model;

[0023] Figure 4 is the front view of the device applied to the drum calibration equipment;

[0024] Figure 5 It is a top view of the device applied to the drum calibration equipment;

[0025] In the figure, 1 is a tray, 2 is a tightening rod, 3 is a lifting ring, 4 is an adjusting screw, 5 is a pressure sensor, 6 is a chassis, 7 is an indentation plate, 8 is a drum, and 9 is a test shaft. Specific embodiments

[0026] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0027] As Figures 1-5 shown, the present utility model discloses a loading force calibration device for a drum testing machine, the device includes: a tray 1, a tightening rod 2 that slides left and right along the axis of the tray inside the tray, and an adjusting screw 4 that is threadedly connected to the tray.

[0028] The center of the tray 1 must be located at the center of the indentation plate 7, and the center of the indentation plate 7 is the center of the drum 8. The pressure sensor 5 is installed at the center of the tray 1. The same center height of the three ensures that the force is not deflected. The tightening rod 2 is used to transmit the loading force of the testing machine to the pressure sensor 5. The lifting ring 3 is used to lift and remove the tightening rod 2. During calibration, the tightening rod 2 is hooked with a sling as a safety protection to prevent the tightening rod from flying out of the test area in case of deflection and force ejection, causing an accident.

[0029] The adjusting screw 4 adjusts the center height of the tightening rod 2. The distance between the adjusting screws is 450 mm, ensuring that the center of gravity of the tightening rod is in the middle of the screws and will not fall out of the tray 1 during adjustment. The screw directly below is used to adjust the center height of the tightening rod during adjustment, and the two side screws are respectively used to adjust the surface contact degree between the tightening rod and the pressure sensor. During adjustment, a 0.02 - 0.05 mm feeler gauge is used to check the contact surface between the tightening rod 2 and the pressure sensor, and the gaps are consistent up, down, left, and right, ensuring that the axis of the tightening rod 2 is consistent with the center height of the test shaft 9 and the center height of the drum 8, ensuring the accuracy of the measurement data, and ensuring that the tightening rod will not pop out due to inconsistent center height, causing personal or equipment accidents.

[0030] The material of the tray is seamless steel pipe D180×8. A part of the seamless steel pipe is cut off along the axis to form a small semi-circular arc. The upper and lower parts are the tray, which is used in a horizontal axis state. In this state, the upper opening of the tray is 210°, with a length of 950 mm, 150 mm shorter than the tightening rod 2. The center of gravity of the tightening rod is within the length range of the tray. On the one hand, the tightening rod 2 can be directly placed into the tray 1 from above, and it will not roll out of the tray 1 due to a small corner angle. On the other hand, it is convenient to install the pressure sensor 5 and adjust the gap between the tray and the tightening rod.

[0031] The material of the tightening rod is 45, and its strength and stiffness meet the requirement of the maximum force of 150 tons. The right end head of the tightening rod is processed to a diameter of φ90 mm, slightly smaller than the diameter of the force-bearing surface of the pressure sensor. The left end tail is processed according to the curved surface of the test shaft 9 to ensure that the contact with the test shaft is surface contact rather than line contact. The diameter of the tightening rod is 110 mm. On the one hand, it ensures that the stiffness meets the force requirement, and on the other hand, the contact area between the tail and the test shaft 9 is large enough to provide a certain tolerance rate.

[0032] A lifting ring 3 is set above the tightening rod. The material of the lifting ring is Q235-A and it is fixed on the tightening rod 2 by M16 screws for safety protection during lifting and testing processes.

[0033] The adjusting screw 4 is a fine-thread M12×1 machined part. The fine-thread has a small pitch and a relatively tight fit clearance. During adjustment, the stability of the screw is good. The head of the screw is processed into a spherical shape, and the spherical head contacts the tightening rod 2 in a point contact rather than a line contact. Three points determine a plane, and there will be no interference due to friction or other reasons during adjustment. Three adjusting screws are arranged circumferentially along the tray, with a total of two rows, which can ensure that the center height of the tightening rod 2 is the same as that of the pressure sensor 5.

[0034] The chassis 6 is a circular steel plate made of Q235-A, with fixed bolt holes 4-φ17, and is fixed on the indentation plate 7 with M16 bolts. The distribution center of the bolt holes is the same as the center of the chassis and the center of the indentation plate. The 4-M10 threaded holes are used to fix the pressure sensor 5, and the distribution center of the threaded holes is the same as the center of the chassis. The surface of the chassis is processed with an annular groove with an outer diameter of φ180 and an inner diameter of φ164 for positioning when welding the tray 1. The center of the annular groove is the same as the center of the chassis. It is used to ensure that the center heights of the chassis, the tray, the pressure sensor, and the indentation plate are the same, and further ensure that the center heights of the test shaft 9, the tightening rod 2, the pressure sensor 5, and the drum 8 are the same.

[0035] When the utility model operates, the tray 1 is positioned and welded through the annular groove of the chassis 6, fixed on the indentation plate 7 by screws. The pressure sensor 5 that has passed inspection is installed on the chassis 6. The overhead traveling crane hoists the jacking rod 2 into the tray 1 through the lifting ring 3, and manually pushes it to the pressure sensor 5. The center height 2 of the jacking rod is adjusted by the adjusting screw 4. The contact surface between the jacking rod 2 and the pressure sensor 5 is checked with a 0.02 mm feeler gauge. After the clearances are consistent up, down, left, and right, the position of the adjusting screw 4 is locked with a set screw. The test shaft 9 is moved to start pressurizing to calibrate the sensor of the testing machine, with a range of 25 - 150 tons.

[0036] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A loading force calibration device for a drum testing machine, characterized in that: The invention comprises a tray (1), wherein the tray is an arc-shaped structure with an upper opening, the right end of the tray is connected to a pressure sensor (5), a tightening rod (2) is arranged above the tray, the tightening rod is arranged coaxially with the tray, the right end of the tightening rod is in contact with the pressure sensor, and a plurality of adjustment screws (4) are threadedly connected to the side wall of the tray, and the adjustment screws penetrate the tray from the outside to the inside and are in contact with the tightening rod (2).

2. A drum testing machine loading force calibration device according to claim 1, characterized in that: The left end of the tightening rod (2) is provided with an arc-shaped end surface which is in surface contact with the test shaft (9).

3. The loading force calibration device for a drum testing machine according to claim 1, characterized in that: The length of the tray (1) is smaller than the length of the tightening rod (2).

4. The loading force calibration device for a drum testing machine according to claim 1, characterized in that: The upper opening of the tray (1) is 210°.

5. The loading force calibration device for a drum testing machine according to claim 1, characterized in that: The end of the adjusting screw (4) that contacts the tightening rod (2) is spherical.

6. The loading force calibration device for a drum testing machine according to claim 1, characterized in that: The adjustment screws (4) are arranged at intervals along the circumferential direction of the arc-shaped surface of the tray (1).

7. The loading force calibration device for a drum testing machine according to claim 1, characterized in that: The adjusting screw (4) is provided with a fixing nut in cooperation with the fixing nut, and the fixing nut is provided on the outer side surface of the tray (1).

8. The loading force calibration device for a drum testing machine according to claim 1, characterized in that: The right end of the tray (1) is connected to a chassis (6), the left side of the chassis is fixedly connected to the pressure sensor (5), and the right side of the chassis (6) is in contact with the rotating drum (8).

9. The loading force calibration device for a drum testing machine according to claim 1, characterized in that: Reinforcing ribs are provided between the tray (1) and the chassis (6).

10. The loading force calibration device for a drum testing machine according to claim 1, characterized in that: A lifting ring (3) is provided above the tightening rod (2).

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