Device for measuring volume of ammunition chamber of ammunition body

Abstract

The utility model provides a projectile body powder chamber volume measuring device which comprises a measuring machine frame, a rotating main shaft, a sliding rail and a computer are arranged on the measuring machine frame, the rotating main shaft drives a projectile body to be measured to rotate through a three-jaw chuck, a grating displacement sensor is installed on a sliding block on the sliding rail and used for monitoring position information of the sliding block, and the sliding block can move in the length direction of the sliding rail. A supporting rod is installed on the sliding block, and a laser displacement sensor and a micro stepping motor are installed on the supporting rod and used for collecting inner diameter information of a projectile body cartridge chamber. And the computer receives data of the main shaft encoder, the grating displacement sensor and the laser displacement sensor and calculates a volume value after data processing. According to the utility model, rapid and non-contact automatic measurement of the ammunition chamber can be realized, and the problems of later drying treatment, rust prevention and the like required by a traditional'water weighing method 'are solved.

Description

Technical Field

[0001] The utility model relates to a device for measuring the volume of an inner cavity, in particular to a device for measuring the volume of a projectile chamber. Background Art

[0002] The shell chamber is an important part that affects the performance of the shell. Its volume determines the density of the explosive. The volume of the shell chamber determines the mass of the explosive and thus controls the density of the explosive. If the density of the explosive is too high, there may be a risk of bursting, and if the density is too low, it will affect the striking performance of the shell. Therefore, it is of great significance to measure the geometric parameters of the shell chamber with high precision.

[0003] At present, a method for measuring the volume of artillery chambers using laser triangulation has been proposed. The method places a laser displacement sensor into the chamber of the artillery through a centering mechanism, and uses a rotating stepper motor and a propulsion stepper motor drive device. The rotating motor drives the mechanism to perform circular measurements on the cross section of the target chamber. Each time a cross section is measured, the propulsion stepper motor steps forward once, and then the diameter information is obtained by calculating the maximum chord length of each cross section. This method is suitable for straight-through pipe parts with larger diameters. If a higher accuracy is to be achieved, the stepping distance needs to be small enough, which will result in a long information collection time and low detection efficiency. In addition, the addition of a centering mechanism may damage the inner wall of the chamber, causing the volume to change.

[0004] Therefore, in order to solve the above problems, it is necessary to design a new non-contact projectile chamber volume measuring device to improve the efficiency of projectile chamber volume detection. Utility Model Content

[0005] In order to solve the above-mentioned problems in the prior art, the utility model provides a device for measuring the volume of a projectile chamber to improve the above-mentioned deficiencies.

[0006] The technical solution of the utility model is as follows: a device for measuring the volume of a projectile chamber, comprising a measuring frame, on which a rotating spindle, a slide rail, and a computer are arranged; the projectile to be measured is connected to the spindle by clamping a three-jaw chuck, and the spindle drives it to rotate; a slider is installed on the slide rail and can reciprocate along the length direction of the slide rail, a grating displacement sensor is installed on one side of the slider, and a grating ruler is installed on the slide rail on the same side.

[0007] A support rod is installed on the slider, a micro-stepping motor is installed at the front end of the support rod, and the main shaft of the micro-stepping motor is connected to the base of the laser displacement sensor to control its rotation.

[0008] Furthermore, the encoder of the rotating spindle transmits the angular displacement and coordinate information of the projectile to be measured to the computer.

[0009] Furthermore, the slider slides downward along the axis of the projectile, and the grating displacement sensor on the slider transmits the displacement coordinates of the slider, that is, the coordinate information of the laser displacement sensor, to the computer.

[0010] Furthermore, the laser displacement sensor transmits the inner diameter information of the inner wall of the projectile chamber to the computer.

[0011] Compared with the prior art, the measuring device of the utility model is a brand-new device for measuring the volume of the chamber of a projectile, which has a novel structure and the following characteristics:

[0012] 1. Non-contact measurement: The device obtains the inner diameter information of the projectile chamber through the laser displacement sensor and combines the coordinate information of the grating ruler and the rotating spindle encoder to obtain the inner wall information of the projectile chamber, and the chamber volume can be obtained by calculation.

[0013] 2. High measurement efficiency: While the device drives the projectile to be tested to rotate, the support rod with a point laser displacement sensor installed on the slider extends into the projectile chamber along the axis of the projectile at the same time, and obtains the point cloud information of the inner wall of the projectile chamber through spiral collection, thereby improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the utility model structure.

[0015] Figure 2 It is a side schematic diagram of the utility model.

[0016] Figure 3 This is a local enlarged schematic diagram of point A.

[0017] Figure 4 This is a schematic diagram of the laser sensor base installation structure.

[0018] Illustration: 1 measuring frame, 2 rotating spindle, 3 three-jaw chuck, 4 projectile to be measured, 5 computer, 6 micro stepping motor, 7 laser displacement sensor, 8 slide rail, 9 grating displacement sensor, 10 support rod, 11 slider, 12 laser sensor base. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0020] When implementing it, Figure 1-4As shown, a device for measuring the volume of a projectile chamber comprises a measuring frame 1, on which a rotating spindle 2, a slide rail 8, and a computer 5 are arranged. A three-jaw chuck 3 is installed on the rotating spindle 2 to clamp the projectile 4 to be measured, and the rotating spindle 2 can drive the projectile 4 to be measured to rotate. The encoder of the rotating spindle 2 can transmit the angular displacement and coordinates of the projectile 4 to be measured to the computer 5. A slider 11 is installed on the slide rail 8, and a support rod 10 is installed on the slider 11. A grating displacement sensor 9 is installed on one side of the slider 11, and a grating ruler is installed on the same side of the slide rail 8. The grating displacement sensor 9 can collect the displacement and coordinate information of the slider and transmit it to the computer 5. A micro-stepping motor 6 is installed at the front end of the support rod 10, and a laser displacement sensor 7 is installed on the shaft of the micro-stepping motor 6 through a laser sensor base 12. The laser displacement sensor transmits the inner diameter information of the projectile chamber to be measured to the computer 5.

[0021] When using this device to measure the volume of the projectile chamber, first, place the projectile to be tested on the three-jaw chuck and clamp it, adjust the position of the slider so that the laser displacement sensor is at the opening of the projectile chamber to be tested, and after starting the system, the rotating spindle starts to drive the projectile to be tested to rotate at a certain speed, and at the same time the slider starts to slide downward, and the support rod extends the laser displacement sensor into the projectile chamber along the axis of the projectile. In this process, the encoder, grating displacement sensor, and laser displacement sensor of the rotating spindle are sampled at the same sampling frequency, and the sampled data are transmitted to the computer. The data collected by the spindle encoder α i is the angle information of the i-th sampling point, and the data z collected by the grating displacement sensor i is the Z-axis coordinate information of the i-th sampling point, and the data r collected by the laser displacement sensor j is the distance from the i-th sampling point to the laser emission point of the laser displacement sensor. The sampling data of the rotary spindle encoder, grating displacement sensor, and laser displacement sensor are transmitted to the computer, and the computer processes and calculates the received data. The spatial coordinates of the i-th sampling point on the inner wall of the projectile chamber are (x i ,y i ,z i ), where the data collected by the spindle encoder is α i is the angle information of the i-th sampling point, and the data z collected by the grating displacement sensor i is the Z-axis coordinate information of the i-th sampling point, and the data rj collected by the point laser displacement sensor is the distance from the i-th sampling point to the point where the laser displacement sensor emits the laser. The sampling data of the rotary spindle encoder, grating displacement sensor, and point laser displacement sensor are transmitted to the computer, and the computer processes and calculates the received data. The spatial coordinates of the i-th sampling point on the inner wall of the projectile chamber are (x i ,y i ,z i ),in z i =zi (in is the angle between the laser direction of the point laser displacement sensor and the vertical direction of the missile axis), so as to obtain the point cloud P of the inner wall of the chamber of the missile to be tested = {p 1 ,p 2 ,…,p n},p i =(x i ,y i ,z i )∈R 3 The point cloud information of the inner wall of the projectile chamber is filtered, and the processed point cloud is sliced ​​according to the same thickness δ to obtain n point cloud slices. Each layer of point cloud slice is projected to the XOY plane, and the projection contour is fitted into a two-dimensional circle to obtain the radius R of each circle. j , calculate the area S of each slice using the circle area formula j , and finally through the formula Calculate the volume V of the chamber.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A device for measuring the volume of a projectile chamber, characterized in that: The invention comprises a measuring frame, on which a rotating spindle, a slide rail and a computer are arranged, a projectile to be measured is used to be arranged on the rotating spindle of the measuring frame, an encoder is arranged on the rotating spindle, a three-jaw chuck is arranged on the rotating spindle, a slider is arranged on the slide rail, the slider is installed on the slide rail and can move along the length direction of the slide rail, a grating displacement sensor is installed on one side of the slider, a grating ruler is installed on the same side of the slide rail, and the encoder, grating displacement sensor and laser displacement sensor on the rotating spindle are connected with the computer signal.

2. A device for measuring the volume of a projectile chamber according to claim 1, characterized in that: A support rod is installed on the slide block.

3. A device for measuring the volume of a projectile chamber according to claim 2, characterized in that: A micro stepping motor is installed at the front end of the support rod.

4. A device for measuring the volume of a projectile chamber according to claim 3, characterized in that: A laser displacement sensor is fixed on the shaft of the micro stepping motor via a laser sensor base.

Images