CN219104591U

CN219104591U - Bending test machine for thinning grinding wheel teeth

Info

Publication number: CN219104591U
Application number: CN202223558551.9U
Authority: CN
Inventors: 谢兴建; 杨芸有; 孙宇
Original assignee: Qinhuangdao Daotian Precision Abrasives Co ltd
Current assignee: Qinhuangdao Daotian Precision Abrasives Co ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-05-30
Anticipated expiration: 2032-12-30

Abstract

The utility model provides an anti-breaking testing machine for thinning grinding wheel teeth, which aims at the defects that the detection result of anti-breaking strength detection is inaccurate by adopting a kilogram scale and the accuracy of the obtained result is low because of the need of manual continuous observation in the prior art.

Description

Bending test machine for thinning grinding wheel teeth

Technical Field

The utility model relates to a bending test device, in particular to a bending test machine for thinning grinding wheel teeth.

Background

As shown in fig. 1, the teeth of the thinned grinding wheel are in a special shape and arc-shaped block shape, and a certain strength is required, so that the flexural strength test is required. Because the teeth are relatively small and special in shape, it is not possible to use general equipment for inspection. In production practice, the self-made material tooth strength testing device of the unit comprises a kilogram scale, a pressurizing rod 304, an upper pressure head 104 and a lower pressure head 105, wherein the upper pressure head and the lower pressure head are positioned on a table top 306 of the scale, one end of the pressurizing rod is hinged with a support 302, the other end of the pressurizing rod is provided with a hand tightening nut 301, a screw 303 is arranged opposite to the hand tightening nut, the screw and the support are respectively positioned on two sides of the table top, the material tooth is placed between the upper pressure head and the lower pressure head, the upper pressure head and the lower pressure head are both positioned below the pressurizing rod, when in test, the nut is screwed tightly by hand, so that the feeding tooth of the pressurizing rod applies force, the kilogram scale indication is continuously increased in the process, a user needs to continuously observe the kilogram scale indication, and the moment kilogram scale indication of the broken material tooth is taken as the breaking strength of the material tooth. By adopting the structure, two defects are that: 1. the hand screw applies pressure, and in the stress application process, the stress application speed is affected, so that the bending data is inaccurate. 2. The kilogram is called a display instrument, so that peak data cannot be accurately displayed, and continuous observation by human eyes is needed. Therefore, the operation is inconvenient and is subjectively affected. In order to solve the technical problems, a special flexural strength test device for the material teeth is developed to detect the strength of the material teeth.

Disclosure of Invention

The utility model aims to provide a bending test machine for thinning grinding wheel teeth, which aims at overcoming the defects that the bending strength detection result is inaccurate by adopting a kilogram scale and the accuracy of the obtained result is low due to the fact that manual continuous observation is needed in the prior art.

The technical aim of the utility model is realized by the following technical scheme:

the bending test machine comprises a force application unit and a pressure control and acquisition unit, wherein the pressure control and acquisition unit comprises a pressure sensor for detecting the pressure received by the material tooth and a control device, the force application unit comprises an electric push rod, an upper pressure head and a lower pressure head, the pressure sensor is connected with the electric push rod and used for detecting the reaction force received by the electric push rod, the upper pressure head and the lower pressure head are oppositely arranged, the output end of the electric push rod is connected with the upper pressure head, a direct current motor of the electric push rod is electrically connected with the output end of the control device, the pressure sensor is electrically connected with the input end of the control device, and the control device controls the steering of the direct current motor of the electric push rod so as to control the reciprocating movement of the direct current motor of the electric push rod and records the pressure value acquired by the pressure sensor;

the upper pressing head is provided with a protruding structure, the lower pressing head is provided with two supporting structures, the material teeth are erected through the two supporting structures, and the protruding structure is oppositely arranged with the two supporting structures;

the protruding structure is an upper pressing rod, the supporting structure is a lower pressing rod, and two ends of the upper pressing rod and the lower pressing rod are respectively fixed on the protruding table;

the control device comprises an upper computer and a lower computer, wherein the upper computer is in communication connection with the lower computer, the upper computer is connected with the pressure sensor, an H bridge circuit is arranged between the lower computer and a direct current motor of the electric push rod, and the lower computer controls the electric push rod to move through the H bridge circuit;

the direct current motor starting switch, the reset switch and the pause switch are respectively connected with the input end of the upper computer through electrical signals;

the upper computer is an Arduino singlechip;

the lower computer adopts MCU.

The utility model has the following beneficial effects:

the test machine adopting the structure of the utility model adopts the structure of combining the electric push rod and the control device, when the material teeth are pressed, the sensor collects the reaction force of the electric push rod and transmits the reaction force to the control device, so that the force born by the material teeth can be recorded at all times, and when the material teeth are broken, the maximum reaction force recorded by the control device is the anti-breaking force, thus the operation is simple, and the result is more reliable.

Drawings

FIG. 1 is a schematic view of a prior art tooth profile;

FIG. 2 is a schematic diagram of a prior art apparatus for measuring the tooth strength of a sample;

FIG. 3 is a schematic view of an embodiment of a bending test machine for thinning grinding wheel teeth according to the present utility model;

FIG. 4 is a schematic diagram of an embodiment of a detection control circuit;

FIG. 5 is a schematic structural view of an embodiment of the connection relationship between a pressure sensor of a bending test machine and an electric push rod for thinning grinding wheel teeth.

The reference numerals are used to describe the components,

100. force applying unit

101. An electric push rod; 102. a linear guide rail; 103. a sliding table; 104. an upper pressure head; 105. a lower pressure head; 106. a pressing rod is arranged on the upper part; 107. a lower pressing rod; 110. a base; 111. a boss; 112. electric push rod seat body

200. A pressure control and acquisition unit; 201. a pressure sensor; 202. an upper computer; 203. a lower computer;

301. tightening the nut by hand; 302. supporting; 303. a screw, 304, a pressurizing rod; 305. weighing a display screen; 306. table top

Detailed Description

The utility model is described in further detail below with reference to the drawings and the specific examples. Wherein like parts are designated by like reference numerals. This specific example is merely illustrative of the utility model and is not intended to be limiting.

As shown in fig. 3 to 5, the bending test machine for thinning abrasive teeth according to the embodiment of the present utility model mainly includes two parts, one part is a force applying unit 100, the other part is a pressure detecting and controlling unit 200, the force applying unit applies pressure to the teeth, and the pressure detecting and controlling unit detects and records the breaking pressure applied to the teeth and controls the force applying speed of the force applying unit.

In the present utility model, as shown in fig. 3, the force applying unit 100 includes an electric push rod 101, an upper pressure head 104, and a lower pressure head 105, where the upper pressure head is fixedly connected with the output end of the electric push rod, and the lower pressure head is fixedly disposed on the base and below the upper pressure head. The electric push rod is used as a force applying unit for applying pressure to the material teeth. Preferably, a support structure is arranged on the lower pressing head to lift the material teeth, so that the middle part of the material teeth is suspended, the support structure can be two bulges, a protruding structure is arranged on the upper pressing head, the material teeth are pressed down through the protruding structure, the material teeth are supported through the support structure, so that the force application position and the force application direction are more accurate, an upper pressing rod 106 is preferably arranged on the upper pressing head as the protruding structure, two lower pressing rods 107 are preferably arranged on the lower pressing head as the support structure, the upper pressing rods are fixedly arranged between two bosses 111 arranged on the upper pressing head, and each lower pressing rod is also fixedly arranged between the two bosses 111. The boss is used as a fixed structure and is also used as a limiting structure of the material teeth, the operation is convenient, the arrangement directions of the upper pressing rod and the lower pressing rod are the same, the positions of the upper pressing rod and the positions of the two lower pressing rods are opposite, the two lower pressing rods are used for supporting the material teeth at a certain distance, the material teeth are arranged on the two lower pressing rods in a crossing mode along the length direction of the material teeth, and the electric pushing rod presses the upper pressing rod so as to press the middle section of the material teeth. Preferably, a sliding table 103 and a linear guide rail 102 are arranged, the linear guide rail 102 is arranged along the telescopic direction of the electric push rod, the upper pressure head is arranged on the sliding table, the linear guide rail is arranged on the base, and when the electric push rod pushes the upper pressure head to move, the sliding table slides along the linear guide rail, so that the upper pressure head is ensured to move stably.

The pressure detecting and controlling unit 200 comprises a pressure sensor 201 and a control device, a direct current motor of the electric push rod is electrically connected with an output end of the control device, the pressure sensor is electrically connected with an input end of the control device, a detecting head of the pressure sensor is fixedly connected with the electric push rod base 112, and the pressure sensor is fixedly arranged on the base 110. When the electric push rod pushes the sliding table to move to the pressing direction, and then the upper pressing head is driven to move to press the material teeth, the reaction force of the electric push rod acts on the pressure sensor, the reaction force of the electric push rod is detected by the pressure sensor and transmitted to the control device in real time, the reaction force received by the electric push rod is recorded by the control device, and when the reaction force of the electric push rod disappears, namely, the maximum reaction force when the material teeth break is the flexural strength of the material teeth. In order to prevent the direct current motor of the electric push rod from being easily melted and adhered due to the large contact point of the starting current and to prevent the occurrence of the technical problem of large test result error caused by the rapid contact of the electric push rod with the material teeth as shown in fig. 4, the control unit of the utility model preferably comprises an upper computer 202 and a lower computer 203, the upper computer is in communication connection with the lower computer, an H bridge circuit is arranged between the output end of the lower computer and the direct current motor of the electric push rod, the upper computer sends a signal to the lower computer, the lower computer controls the direct current motor through the H bridge circuit, and thus the lower computer controls the electric push rod to reciprocate to regulate the speed of the electric push rod. In the communication process of the upper computer and the lower computer, the upper computer outputs a digital signal, and in the process of the lower computer controlling the H bridge, the lower computer outputs PWM, and the main function of the lower computer is to analyze the signal and output PWM. Preferably, the two ends of the linear guide rail are also provided with electric push rod position sensors for sensing the positions of the electric push rods, the start button, the reset button, the stop button and the position sensors are electrically connected with the input end of the upper computer, the upper computer processes the input button signals, the signals of the position sensors such as an upper travel switch, a lower travel switch and the like, and the current sensor signals of the electric push rods, and the output end of the lower computer is electrically connected with the direct current motor through an H bridge. Preferably, the upper computer adopts an Arduino singlechip, such as ATmega328P, the lower computer adopts a Micro Controller Unit singlechip, and the specific model can be SAMD21, which is called MCU for short. The pressure control and acquisition unit adopting the structure of the utility model has the advantages that firstly, because the H bridge is arranged between the lower computer and the direct current motor, when the direct current motor is used for speed regulation, the direct current motor can have high torque output at low rotating speed, the cost of a protection circuit is low, and secondly, the upper computer acquires button signals, signals of an upper travel switch and a lower travel switch, current sensor signals of an electric push rod, pressure signals of a pressure sensor and the like, the Arduino only needs to output rotating speed/steering signals to the lower singlechip according to acquired starting or stopping or resetting signals in the aspect of motor control, and the lower computer receives the signals and converts the signals into PWM signals to be output to the H bridge, so that the action of the electric push rod is controlled, and the control of the electric push rod is finished by the lower computer, thereby reducing the operation load of the upper computer, reducing the cost investment, realizing the protection of an electronic circuit at low cost, simultaneously realizing the functions of speed regulation/low speed high torque/braking and reducing the cost of the electric push rod. Preferably, a display screen is provided to display a reading of the breakage of the teeth. The utility model adopts a 1.3 inch OLED screen which is connected with an upper computer electric signal. The pressure data obtained by the upper computer is displayed by a display. The pressing rod is preferably a tungsten steel rod.

The using method of the bending test machine provided by the utility model comprises the following steps:

1. placing the teeth to be detected between an upper pressure head and a lower pressure head;

2. clicking a starting button;

3. the lower computer automatically controls the electric push rod to push out and drives the upper pressure head to slowly move downwards;

4. after the pressure sensor detects that the upper pressure head touches the material teeth, the lower movement is stopped, and the pressure of the push rod is slowly increased;

5. after the material teeth are broken, the equipment is automatically reset, and the broken value is displayed on a display;

6. and (5) finishing detection and waiting for the next detection.

When the bending strength testing machine with the structure is used for testing the bending strength, the labor can be effectively saved, the whole testing process can be completed by pressing the key, and the final result is displayed on the display, so that the result is reliable, and the labor intensity are saved.

Claims

1. The utility model provides an antiflex test machine for attenuate emery wheel material tooth, its characterized in that includes force application unit and pressure control and collection unit, pressure control and collection unit including pressure sensor and the controlling means who detects the pressure that the material tooth received, force application unit includes electric putter, goes up pressure head and lower pressure head, pressure sensor is connected with electric putter and is used for detecting the reaction force that electric putter received, goes up pressure head and lower pressure head relative setting, electric putter's output connection goes up the pressure head, electric putter's direct current motor and controlling means's output electrical signal connection, thereby pressure sensor and controlling means's input electrical signal connection, thereby controlling electric putter's direct current motor turns to control its reciprocating motion to the pressure value that pressure sensor gathered is recorded.

2. The bending machine for thinning abrasive wheel teeth according to claim 1, wherein: the upper pressing head is provided with a protruding structure, the lower pressing head is provided with two supporting structures, the material teeth are erected through the two supporting structures, and the protruding structure and the two supporting structures are oppositely arranged.

3. The bending test machine for thinning abrasive teeth according to claim 2, wherein the protruding structure is an upper pressing bar, the supporting structure is a lower pressing bar, and both ends of the upper pressing bar and the lower pressing bar are respectively fixed on the protruding table.

4. The bending machine for thinning abrasive wheel teeth according to claim 1, wherein: the control device comprises an upper computer and a lower computer, wherein the upper computer is in communication connection with the lower computer, the upper computer is connected with the pressure sensor, an H bridge circuit is arranged between the lower computer and a direct current motor of the electric push rod, and the lower computer controls the electric push rod to move through the H bridge circuit.

5. The bending machine for thinning abrasive wheel teeth according to claim 4, wherein: the direct current motor starting switch, the reset switch and the pause switch are respectively connected with the input end of the upper computer through electrical signals.

6. The bending test machine for thinning the grinding wheel teeth according to claim 4, wherein the upper computer is an Arduino single-chip microcomputer.

7. The bending test machine for thinning abrasive wheel teeth according to claim 4, wherein the lower computer adopts an MCU.