Testing machine falling rate detection device

Abstract

The utility model relates to the technical field of rate detection, in particular to a testing machine falling rate detection device. Comprising a stand column, a first proximity switch and a second proximity switch are arranged on the stand column, a connecting rod is arranged outside the stand column, a metal sheet is arranged at the end, close to the stand column, of the connecting rod, and a strong magnet is arranged at the end, away from the stand column, of the connecting rod; the timing circuit is used in cooperation with the first proximity switch and the second proximity switch; according to the safety hammer, the strong magnet is arranged and adsorbed on the hammer head, the metal sheet is located above the first proximity switch, in the falling process of the hammer head, the metal sheet enables the first proximity switch to be closed firstly, then the normally-open contact of the first relay is closed, the millisecond meter starts timing, and when the metal sheet enables the second proximity switch to be closed, the millisecond meter starts timing. When the hammer falls down, the normally open contact of the second relay is closed, the millisecond meter stops timing, the reading of the millisecond meter is the falling time of the hammer, and the instantaneous speed of the hammer can be obtained through calculation.

Description

Technical Field

[0001] This utility model relates to the field of rate detection technology, specifically a device for detecting the falling rate of a testing machine. Background Technology

[0002] Currently, there are two main types of testing machines used for testing physical and chemical properties: one type is a testing machine with a fixed set rate, and the other type is an impact testing machine that conforms to the laws of free fall. The former mainly measures the fixed rate using a wire displacement sensor, gauge blocks, or a precision rangefinder in conjunction with a handheld stopwatch; however, there is no clear method for measuring the rate of an impact testing machine.

[0003] Chinese utility model patent CN209417075U provides an impact velocity measuring device for a drop hammer impact testing machine, including a base, a frame at the upper end of the base, two parallel linear guide rails on the inner side of the frame, a workpiece stage at the upper end of the base, a workpiece on the upper part of the workpiece stage, a slide table on the linear guide rails, a hammer head at the lower end of the slide table, an L-shaped angle iron fixedly mounted on the slide table, and a timing plate fixed to the L-shaped angle iron by bolts. Speed ​​measuring mechanisms are installed at both ends of the frame. By setting a digital fiber optic sensor and a timing plate on the drop hammer impact testing machine, the speed is measured by the time it takes for light to be blocked, allowing for rapid speed measurement during the drop hammer impact process.

[0004] While the aforementioned patent can detect the falling speed, it requires modification of the existing testing machine for testing, and the price of digital fiber optic sensors is very high, resulting in significant modification costs. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a convenient and easy-to-use testing machine drop rate detection device.

[0006] The technical solution adopted by this utility model to solve its technical problem is a falling rate detection device for a testing machine, including a column, on which a first proximity switch and a second proximity switch are spaced apart. A connecting rod is provided on the outside of the column, and a metal plate is provided at the end of the connecting rod near the column to cooperate with the first and second proximity switches. A strong magnet is provided at the end of the connecting rod away from the column. It also includes a timing circuit that cooperates with the first and second proximity switches. The timing circuit includes a power supply, a circuit breaker, a first relay, a second relay, and a millisecond timer. The power supply is provided with a live wire and a neutral wire. The circuit breaker is provided on the live wire and the neutral wire. The live wire is electrically connected to the input interface of the first proximity switch and the second proximity switch respectively. The output interface of the first proximity switch is electrically connected to the input interface of the first relay. The output interface of the second proximity switch is electrically connected to the input interface of the second relay. The output interfaces of the first relay and the second relay are electrically connected to the neutral wire. The normally open contacts of the first relay and the second relay are electrically connected to the millisecond timer.

[0007] Furthermore, both the first proximity switch and the second proximity switch are provided with a locking mechanism. The locking mechanism includes a mounting hole, and the inner wall of the mounting hole is provided with a threaded hole, and a locking bolt is internally threaded into the threaded hole.

[0008] Furthermore, a base is provided at the bottom of the column.

[0009] Furthermore, the vertical distance between the end face of the metal sheet near the column and the first proximity switch and the second proximity switch is no more than 15mm.

[0010] Furthermore, the strong magnet is connected to the connecting rod by a thread.

[0011] The beneficial effects of this utility model are as follows: By setting a strong magnet, the strong magnet is attracted to the hammer head, so that the metal plate is located above the first proximity switch. During the fall of the hammer head, the metal plate will first close the first proximity switch, and then close the normally open contact of the first relay, and the millisecond timer will start timing. When the metal plate closes the second proximity switch, the normally open contact of the second relay will close, and the millisecond timer will stop timing. The reading of the millisecond timer is the time of the hammer head falling. The instantaneous speed of the hammer head can be obtained by calculation. This application does not require modification of existing equipment, and the operation is more convenient and faster. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the present invention applied to an existing testing machine;

[0014] Figure 3 This is a schematic diagram of the present invention used on a drop weight testing machine;

[0015] Figure 4 This is a schematic diagram of the locking mechanism.

[0016] Reference numerals: 1-Column; 2-First proximity switch; 3-Second proximity switch; 4-Linkage rod; 5-Metal sheet; 6-Strong magnet; 7-Power supply; 8-Circuit breaker; 9-First relay; 10-Second relay; 11-Millisecond timer; 12-Live wire; 13-Neutral wire; 14-Base; 15-Mounting hole; 16-Locking bolt. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] like Figures 1-4 As shown, this utility model discloses a falling rate detection device for a testing machine, comprising a column 1, on which a first proximity switch 2 and a second proximity switch 3 are spaced apart. A connecting rod 4 is provided on the outer side of the column 1. A metal plate 5, cooperating with the first proximity switch 2 and the second proximity switch 3, is provided at the end of the connecting rod 4 near the column 1, and a strong magnet 6 is provided at the end of the connecting rod 4 away from the column 1. The device also includes a timing circuit cooperating with the first proximity switch 2 and the second proximity switch 3. The timing circuit includes a power supply 7, a circuit breaker 8, a first relay 9, a second relay 10, and a millisecond timer 11. The power supply 7 is provided with a live wire 12 and a neutral wire 13. The circuit breaker 8 is installed on the live wire 12 and the neutral wire 13. The live wire 12 is electrically connected to the input interfaces of the first proximity switch 2 and the second proximity switch 3, respectively. The output interface of the first proximity switch 2 is electrically connected to the input interface of the first relay 9. The output interface of the second proximity switch 3 is electrically connected to the input interface of the second relay 10. The output interfaces of the first relay 9 and the second relay 10 are electrically connected to the neutral wire 13. The normally open contact of the first relay 9 and the normally open contact of the second relay 10 are electrically connected to the millisecond timer 11.

[0019] Among them, see Figure 1The column 1 can be made of carbon fiber tubing. The first proximity switch 2 and the second proximity switch 3 can be capacitive proximity switches. During installation, the first proximity switch 2 is positioned above the second proximity switch 3, and the sensing heads of the first proximity switch 2 and the second proximity switch 3 are located on the same side of the column 1, with their sensing planes coplanar. The strong magnet 6 is made of neodymium iron boron and is cylindrical. It can be connected to the connecting rod 4 by adhesive bonding. The other end of the connecting rod 4 is equipped with a metal plate 5, which is 100mm long, 50mm wide, and 3mm thick. When the metal plate 5 passes through the first proximity switch 2 and the second proximity switch 3, it can close the first proximity switch 2 and the second proximity switch 3, thus completing the circuit. After passing through, the first proximity switch 2 and the second proximity switch 3 will return to their initial open state, thus closing the circuit. See also Figure 2 and Figure 3 In the initial state, the strong magnet 6 is attached to the testing machine to be measured. If it is a regular testing machine, it is attached to the movable crossbeam; if it is a drop hammer testing machine, it is attached to the hammer head. The connecting rod 4 is arranged horizontally. The metal plate 5 is vertically offset from the first proximity switch 2. The vertical offset distance between the metal plate 5 and the first proximity switch 2 is at the zero-limit state, that is, the first proximity switch 2 cannot sense it. The first proximity switch 2 closes the moment the metal plate 5 falls. The second proximity switch 3 is at the same height as the anvil. When the hammer head of the testing machine starts to move, the first proximity switch 2 senses the metal plate 5 and closes, thereby turning on the circuit. The first relay 9 is energized, causing the normally open end of the first relay 9 to close, and the millisecond timer 11 starts timing. When the second proximity switch 3 senses the metal plate 5, the second proximity switch 3 closes, thereby turning on the circuit. The second relay 10 is energized, causing the normally open end of the second relay 10 to close, and the millisecond timer 11 stops timing. At this point, the time interval measured by the millisecond meter 11 minus the sum of the closing times of the two normally open contacts of the relay is the time taken for the testing machine to perform this relative displacement. For a fixed-rate testing machine, the displacement between the first proximity switch 2 and the second proximity switch 3 is measured by an infrared rangefinder, and divided by the time, which gives the fixed rate. For a drop hammer testing machine, this time multiplied by the local gravitational acceleration is the instantaneous rate at which the hammer falls onto the anvil.

[0020] To improve the adaptability of the device, both the first proximity switch 2 and the second proximity switch 3 are further provided with a locking mechanism. The locking mechanism includes a mounting hole 15, and a threaded hole is provided on the inner wall of the mounting hole 15. A locking bolt 16 is threaded into the threaded hole. The mounting hole 15 is a vertically arranged through hole. During installation, the first proximity switch 2 and the second proximity switch 3 are sleeved on the upright, and the locking bolt 16 is rotated so that the shank of the locking bolt 16 abuts against the upright, thereby locking the first proximity switch 2 and the second proximity switch 3.

[0021] To improve the stability of the column 1, a base 14 is further provided at the bottom of the column 1. The base 14 can be made of cylindrical or square steel material and weighs 10 kg.

[0022] To ensure that the first proximity switch 2 and the second proximity switch 3 can respond promptly when the metal sheet 5 falls, the vertical distance between the end face of the metal sheet 5 near the column 1 and the first proximity switch 2 and the second proximity switch 3 is no more than 15mm.

[0023] To facilitate the replacement of the strong magnet 6, the strong magnet 6 is further connected to the connecting rod 4 by a thread. An external thread is manufactured on the connecting rod 4, and an internal thread is manufactured on the strong magnet 6, thus achieving a threaded connection between the strong magnet 6 and the connecting rod 4.

[0024] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A device for detecting the falling rate of a testing machine, comprising a column (1), characterized in that: The column (1) is provided with a first proximity switch (2) and a second proximity switch (3) spaced apart. A connecting rod (4) is provided on the outside of the column (1). A metal plate (5) is provided at the end of the connecting rod (4) near the column (1) to cooperate with the first proximity switch (2) and the second proximity switch (3). A strong magnet (6) is provided at the end of the connecting rod (4) away from the column (1). The column (1) also includes a timing circuit to cooperate with the first proximity switch (2) and the second proximity switch (3). The timing circuit includes a power supply (7), a circuit breaker (8), a first relay (9), a second relay (10), and a millisecond timer (11). A fire sensor is provided on the power supply (7). The circuit breaker (8) is set on the live wire (12) and the neutral wire (13). The live wire (12) is electrically connected to the inlet interface of the first proximity switch (2) and the second proximity switch (3). The outlet interface of the first proximity switch (2) is electrically connected to the inlet interface of the first relay (9). The outlet interface of the second proximity switch (3) is electrically connected to the inlet interface of the second relay (10). The outlet interfaces of the first relay (9) and the second relay (10) are electrically connected to the neutral wire (13). The normally open contacts of the first relay (9) and the second relay (10) are electrically connected to the millisecond timer (11).

2. The testing machine falling rate detection device as described in claim 1, characterized in that: Both the first proximity switch (2) and the second proximity switch (3) are provided with a locking mechanism. The locking mechanism includes a mounting hole (15). The inner wall of the mounting hole (15) is provided with a threaded hole, and a locking bolt (16) is threaded into the threaded hole.

3. The testing machine drop rate detection device as described in claim 2, characterized in that: The bottom of the column (1) is provided with a base (14).

4. The testing machine drop rate detection device as described in claim 1, characterized in that: The vertical distance between the end face of the metal sheet (5) near the column (1) and the first proximity switch (2) and the second proximity switch (3) is no more than 15mm.

5. The testing machine drop rate detection device as described in claim 1, characterized in that: The strong magnet (6) is connected to the connecting rod (4) by a thread.

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