Anti-vibration impact rail transit vehicle speed detection photoelectric pulse generator module

Abstract

This invention discloses a vibration- and shock-resistant photoelectric pulse generator module for speed detection in rail transit vehicles, which has the following advantages: The contact part between the wiring terminal and the signal line is improved to a cylindrical shape, forming a 360-degree surface contact, ensuring good overall contact and resistance to vibration and shock. Furthermore, by adding a drawer-type sliding cover, the connection between the wiring terminal and the signal line is protected, preventing dust accumulation and reducing oxidation and corrosion, thereby providing a stable pulse signal for speed detection. By opening symmetrical speed measuring windows and adding a first and a second light-transmitting film, the first film is exposed on the same side of the speed measuring window and covers the light emission channel, while the second film is exposed on the same side of the speed measuring window and covers the light receiving channel. This prevents dust from accumulating outside the light emission and receiving channels. The large width of the first and second light-transmitting films exposed in the speed measuring window prevents dust accumulation, thus maintaining a clear light path and ensuring the emission of an effective photoelectric pulse signal during speed detection.

Description

Technical Field

[0001] This invention relates to the field of photoelectric signal generators for speed detection, specifically to a vibration- and shock-resistant photoelectric pulse generator module for speed detection in rail transit vehicles. Background Technology

[0002] Speed ​​detection in subways and other transportation typically relies on photoelectric pulse generator modules electrically connected to the control system. These modules mainly consist of a light emitting module and a light receiving module. The light receiving module receives the light emitted by the light emitting module, converts it into a photoelectric signal, and sends a pulse signal to the control system. The control system then calculates the speed of the subway or other transportation based on the pulse signal. However, existing photoelectric pulse generator modules use open-type elastic clip-on terminals. These terminals have a line-contact electrical connection with the signal line. In the complex vibration environment of subway operation, the signal line can detach from the terminal opening due to vibration and impact. Furthermore, the terminals can lose elasticity due to dust accumulation and oxidation, leading to poor contact. The light emission channels of the light emitting module and the light receiving channel of the light receiving module are narrow slits exposed on the slot walls. In actual use, these narrow slits easily accumulate dust that is difficult to blow away. Dust blocking the slits and causing optical path blockage between the light emitting and receiving modules can lead to signal failures, resulting in erroneous speed calculations by the control system, control errors, and ultimately, accidents. Therefore, improvements are urgently needed. Summary of the Invention

[0003] One technical problem this application aims to solve is to overcome the deficiencies of the above-mentioned related technologies and provide a vibration-resistant photoelectric pulse generator module for speed detection of rail transit vehicles that has a smooth optical path, stable signal transmission, and is resistant to vibration and shock.

[0004] The technical solution adopted by the present invention to solve the technical problem is as follows: a vibration and shock resistant photoelectric pulse generator module for speed detection of rail transit vehicles, including a housing with a speed measuring slot, a light emitting module and a light receiving module respectively disposed on both sides of the speed measuring slot, the light emitting module and the light receiving module being electrically connected to a circuit board, a plurality of terminals being connected to the circuit board, the contact part of the terminals with the signal line being cylindrical, the terminals being covered with a drawer-type sliding cover, the drawer-type sliding cover being slidably connected to the housing, and the drawer-type sliding cover being provided with a wire through hole; The speed measuring slot has symmetrical speed measuring windows on both sides of the slot wall. The light emitting module includes a first light-transmitting film, which is exposed on the same side speed measuring window and covers the light emitting channel. The light receiving module includes a second light-transmitting film, which is exposed on the same side speed measuring window and covers the light receiving channel.

[0005] Compared with related technologies, this invention has the following advantages: The contact portion between the terminal block and the signal line is improved to a cylindrical shape, forming a 360-degree surface contact, ensuring good overall contact and resistance to vibration and impact. Furthermore, by adding a drawer-type sliding cover, the connection between the terminal block and the signal line is protected, preventing dust accumulation and reducing oxidation and corrosion, thereby providing a stable pulse signal for speed detection. By opening symmetrical speed measuring windows and adding a first and a second light-transmitting film, with the first film exposed on the same side of the speed measuring window and covering the light emission channel, and the second film exposed on the same side of the speed measuring window and covering the light receiving channel, dust is blocked from entering the light emission and light receiving channels. The large width of the first and second light-transmitting films exposed in the speed measuring window prevents dust accumulation, thus maintaining a clear light path and ensuring the emission of an effective photoelectric pulse signal during speed detection.

[0006] As an improvement, the wiring port of the terminal block is located on the inner end, and the wire hole is located on the side of the inner end of the drawer-type sliding cover. The signal line is bent, so when the external signal line shakes during vibration, it first acts on the wire hole of the drawer-type sliding cover, maintaining good contact between the signal line and the terminal block.

[0007] As an improvement, the side wing plate of the housing is provided with a winding groove for straightening the winding of the signal line.

[0008] As an improvement, the housing is provided with an electrical connection groove, the wiring terminals are installed in the electrical connection groove, the drawer-type sliding cover covers the electrical connection groove, and the bottom of the electrical connection groove is provided with several stacks of electrical isolation walls, which are arranged between adjacent wiring terminals. This electrically isolates the wiring terminals from each other within the electrical connection groove, preventing short circuits.

[0009] Preferably, the light emitting module includes a light-emitting electronic element, a light emitting channel carrier plate, and a shell-shaped body of a first light-transmitting film. The spherical surface of the light-emitting electronic element protrudes into the groove of the light emitting channel carrier plate, and the light emitting channel carrier plate is embedded in the shell-shaped body of the first light-transmitting film. The light receiving module includes a photosensitive electronic element, a light receiving channel carrier plate, and a shell-shaped body of a second light-transmitting film. The spherical surface of the photosensitive electronic element protrudes into the groove of the light receiving channel carrier plate, and the light receiving channel carrier plate is embedded in the shell-shaped body of the second light-transmitting film. It also includes protective sleeves, which are fitted over the shell-like bodies of the first and second light-transmitting films. The protective sleeves have corresponding openings at the speed measuring window. The protective sleeves protect the light emitting module and the light receiving module. The protective sleeves define the positions of the shell-like bodies of the first and second light-transmitting films. The positions of the light receiving channel and the light emitting channel are defined by the light emitting channel carrier plate embedded within the shell-like body of the first light-transmitting film and the light receiving channel carrier plate embedded within the shell-like body of the second light-transmitting film, ensuring alignment between the light receiving channel and the light emitting channel.

[0010] As an improvement, anti-vibration pads are provided between the light-emitting electronic components and the photosensing electronic components and the circuit board. This adds an anti-vibration design to the light-emitting electronic components and the photosensing electronic components, preventing the pins of the light-emitting electronic components and the photosensing electronic components from breaking or losing electrical connection with the circuit board.

[0011] Preferably, the width of the light emitting channel and the light receiving channel is 0.25mm ± 0.05mm. Reducing the width of the light channels can improve the accuracy of detection time, thereby estimating a more precise speed.

[0012] As an improvement, the light-emitting electronic component is an LED lamp bead, and an adjustable potentiometer is connected in series in the power supply circuit of the LED lamp bead. The cover has an adjustment hole corresponding to the position of the adjustable potentiometer. This is used to reduce the circuit resistance by rotating the adjustable potentiometer after the LED lamp bead decays, thereby increasing the power supply current of the LED lamp bead, compensating for the brightness of the LED lamp, meeting the sensitivity requirements of the photosensitive electronic component, and thus extending its service life.

[0013] As an improvement, the housing is filled with a waterproof sealant layer covering the circuit board, and the waterproof sealant layer is flush with the end face of the adjustable potentiometer. This serves to provide waterproof protection for the electronic components on the circuit board and ensure that the adjustable potentiometer can be turned to reduce its resistance value; at the same time, it strengthens the connection stability between the electronic components and the circuit board and improves shock resistance.

[0014] As an improvement, the circuit board is equipped with a push-pull output signal driver chip. This makes the electrical interface of this photoelectric pulse generator module compatible with NPN connectors, providing strong versatility and allowing for normal signal output without the need for an external load. Attached Figure Description

[0015] Figure 1 This is a perspective view of the drawer-type sliding cover of this application when closed.

[0016] Figure 2 This is a perspective view of the drawer-type sliding cover of this application when it is opened.

[0017] Figure 3 This is a cross-sectional view of this application.

[0018] Figure 4 This is an exploded view of one perspective (default signal line) of this application.

[0019] Figure 5 This is an exploded view from another perspective of this application.

[0020] As shown in the figure: 1. Housing; 1.1. Speed ​​measuring slot; 1.2. Speed ​​measuring window; 1.4. Winding slot; 1.5. Electrical connection slot; 1.6. Electrical isolation wall; 2. Cover; 2.1. Adjustment hole; 3. Circuit board; 4.1. Light-emitting electronic component; 4.2. Light emitting channel carrier plate; 4.3. Shell-shaped body of the first light-transmitting film; 4.4. Photosensitive electronic component; 4.5. Light receiving channel carrier plate; 4.6. Shell-shaped body of the second light-transmitting film; 4.7. Protective sleeve; 4.8. Anti-vibration pad; 5. Wiring terminal; 6. Drawer-type sliding cover; 6.1. Wiring hole; 31. Adjustable potentiometer; 100. Signal line. Detailed Implementation

[0021] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] This invention designs a method such as Figures 1 to 5The vibration- and shock-resistant photoelectric pulse generator module for speed detection of rail transit vehicles shown includes a housing 1 and a cover 2. The housing 1 has a speed measuring slot 1.1, with symmetrical speed measuring windows 1.2 on both sides of the slot. A light emitting module and a light receiving module are respectively arranged next to the two speed measuring windows 1.2. The light emitting module and the light receiving module are respectively inserted into positioning slots on the housing 1. The light emitting module and the light receiving module are electrically connected to a circuit board 3. The circuit board 3 has a power supply circuit for the light emitting module and a photoelectric signal conversion circuit for the light receiving module. Four terminals 5 are connected. The contact part of the terminal 5 with the signal line 100 is cylindrical, forming a 360-degree surface contact, which can resist vibration and impact. The connection port of the terminal 5 is located at the inner end. The terminal 5 is covered with a drawer-type sliding cover 6. The drawer-type sliding cover 6 is slidably connected to the housing 1. The two sides of the inner end of the drawer-type sliding cover 6 are provided with wire holes 6.1 for the signal line 100. The signal line 100 forms a bend at the wire hole 6.1. The two side wing plates of the housing 1 are provided with winding grooves 1.4 for straightening the winding of the signal line 100. The light-emitting module includes a light-emitting electronic element 4.1, a light-emitting channel carrier plate 4.2, and a shell-shaped body 4.3 of a first light-transmitting film. The spherical surface of the light-emitting electronic element 4.1 protrudes into the groove of the light-emitting channel carrier plate 4.2. The light-emitting channel carrier plate 4.2 is embedded in the shell-shaped body 4.3 of the first light-transmitting film. The shell-shaped body 4.3 of the first light-transmitting film semi-encloses and covers the light-emitting electronic element 4.1, that is, the first light-transmitting film is exposed on the same side of the speed measuring window 1.2 and covers the light-emitting channel. The light-receiving module includes a light-sensing electronic element 4.4, a light-receiving channel carrier plate 4.5, and a second light-transmitting film. The shell-shaped body 4.6 has a spherical surface of the photosensitive electronic element 4.4 protruding into the groove of the light receiving channel carrier plate 4.5. The light receiving channel carrier plate 4.5 is embedded in the shell-shaped body 4.6 of the second light-transmitting film. The shell-shaped body 4.6 of the second light-transmitting film semi-encloses and covers the photosensitive electronic element 4.4, that is, the second light-transmitting film is exposed on the same side of the speed measuring window 1.2 and covers the light receiving channel. It also includes a protective sleeve 4.7, which is fitted over the shell-shaped body 4.3 of the first light-transmitting film and the shell-shaped body 4.6 of the second light-transmitting film. The protective sleeve 4.7 has an opening at the location of the speed measuring window 1.2. The advantages are as follows: by adding a first light-transmitting film and a second light-transmitting film, the first light-transmitting film covers the outside of the light emission channel and the second light-transmitting film covers the outside of the light receiving channel, so that dust is blocked outside the light emission channel and the light receiving channel. Moreover, the first light-transmitting film and the second light-transmitting film exposed at the speed measuring window 1.2 are planar structures with a large width and no dust accumulation. Furthermore, the light emission module and the light receiving module are further protected by the protective cover 4.7.

[0024] In this embodiment, the housing 1 is provided with an electrical connection groove 1.5, the wiring terminals 5 are installed in the electrical connection groove 1.5, the drawer-type sliding cover 6 covers the electrical connection groove 1.5, and the bottom of the electrical connection groove 1.5 is provided with several stacks of electrical isolation walls 1.6, which are arranged between adjacent wiring terminals 5. The wiring terminals 5 are electrically isolated from each other to avoid short circuits.

[0025] As an improvement, a vibration damping pad 4.8 is provided between the light-emitting electronic component 4.1 and the photosensitive electronic component 4.4 and the circuit board 3. This is to add a vibration damping design to the light-emitting electronic component 4.1 and the photosensitive electronic component 4.4, so as to prevent the pins of the light-emitting electronic component 4.1 and the photosensitive electronic component 4.4 from breaking or losing electrical connection with the circuit board 3 due to vibration.

[0026] The light emitting channel and light receiving channel can also be referred to as light slits. In this embodiment, the width of the light emitting channel and light receiving channel is preferably 0.25mm ± 0.05mm. Reducing the width of the light slit can improve the sensitivity of the photosensitive electronic element 4.4, shorten the duration of the photoelectric pulse signal, and improve the accuracy of the photoelectric pulse signal response time, thereby making the estimated speed more accurate than that of the existing 0.35~0.4mm light slit.

[0027] This embodiment improves the power supply circuit. The light-emitting electronic component 4.1 is an LED lamp bead. An adjustable potentiometer 31 is connected in series in the power supply circuit of the LED lamp bead. The cover 2 is provided with an adjustment hole 2.1 corresponding to the position of the adjustable potentiometer 31. Two locking blocks are provided on both sides of the cover 2 to be fixed to the housing 1. The four corners of the cover 2 are provided with protrusions that abut against the circuit board 3. When the LED lamp bead decays and the brightness is insufficient, the photosensitive electronic component 4.4 will fail to sense and cannot emit photoelectric pulse signals. By rotating the adjustable potentiometer 31 to reduce the circuit resistance value, the power supply current of the LED lamp bead is increased, and the brightness of the LED lamp is compensated to meet the sensing brightness requirements of the photosensitive electronic component 4.4, so that the photoelectric pulse generator module can continue to be used, thereby extending its service life. The housing 1 is filled with a waterproof sealant layer covering the circuit board 3. The waterproof sealant layer is flush with the end face of the adjustable potentiometer 31 and is used to waterproof the electronic components on the circuit board 3 and ensure that the adjustable potentiometer 31 can be rotated to reduce the resistance value.

[0028] As an improvement, the circuit board 3 is equipped with a push-pull output signal driver chip, which is electrically connected to the terminal block 5. The push-pull output signal driver chip combines PNP and NPN connectors, adapting to either an NPN or NPN connector, offering strong versatility and allowing for normal signal output without an external load. In contrast, existing connectors use either an NPN or NPN output electrical interface, resulting in poor versatility and requiring an external pull-up or pull-down resistor load for normal signal output.

[0029] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A vibration- and shock-resistant photoelectric pulse generator module for speed detection in rail transit vehicles, comprising a housing with a speed measuring slot, a light emitting module and a light receiving module respectively disposed on both sides of the speed measuring slot, the light emitting module and the light receiving module being electrically connected to a circuit board, the circuit board being provided with a plurality of terminals, characterized in that, The contact part between the terminal block and the signal line is cylindrical, and the terminal block is covered with a drawer-type sliding cover. The drawer-type sliding cover is slidably connected to the housing, and the drawer-type sliding cover is provided with a wire through hole. The speed measuring slot has symmetrical speed measuring windows on both sides of the slot wall. The light emitting module includes a first light-transmitting film, which is exposed on the same side speed measuring window and covers the light emitting channel. The light receiving module includes a second light-transmitting film, which is exposed on the same side speed measuring window and covers the light receiving channel.

2. The vibration- and shock-resistant photoelectric pulse generator module for speed detection of rail transit vehicles according to claim 1, characterized in that, The wiring port of the terminal block is located on the inner end, and the wire hole is located on the side of the inner end of the drawer-type sliding cover.

3. The vibration- and shock-resistant photoelectric pulse generator module for speed detection of rail transit vehicles according to claim 2, characterized in that, The side wing plate of the housing is provided with a winding groove.

4. The vibration- and shock-resistant photoelectric pulse generator module for speed detection of rail transit vehicles according to any one of claims 1 to 3, characterized in that, The housing is provided with an electrical connection groove, the wiring terminals are installed in the electrical connection groove, the drawer-type sliding cover covers the electrical connection groove, and the bottom of the electrical connection groove is provided with several stacks of electrical isolation walls, which are arranged between adjacent wiring terminals.

5. The vibration- and shock-resistant photoelectric pulse generator module for speed detection of rail transit vehicles according to claim 1, characterized in that, The light emitting module includes a light-emitting electronic element, a light emitting channel carrier plate, and a shell-shaped body of a first light-transmitting film. The spherical surface of the light-emitting electronic element protrudes into the groove of the light emitting channel carrier plate, and the light emitting channel carrier plate is embedded in the shell-shaped body of the first light-transmitting film. The light receiving module includes a photosensitive electronic element, a light receiving channel carrier plate, and a shell-shaped body of a second light-transmitting film. The spherical surface of the photosensitive electronic element protrudes into the groove of the light receiving channel carrier plate, and the light receiving channel carrier plate is embedded in the shell-shaped body of the second light-transmitting film. It also includes a protective sleeve, which is fitted over the shell-shaped body of the first light-transmitting film and the shell-shaped body of the second light-transmitting film, and the protective sleeve has a corresponding opening at the speed measuring window.

6. The vibration- and shock-resistant photoelectric pulse generator module for speed detection of rail transit vehicles according to claim 5, characterized in that, The light-emitting electronic components and the photosensitive electronic components are provided with anti-vibration pads between themselves and the circuit board.

7. The vibration- and shock-resistant photoelectric pulse generator module for speed detection of rail transit vehicles according to claim 1, 5, or 6, characterized in that, The width of the optical emission channel and the optical reception channel is 0.25mm ± 0.05mm.

8. The vibration- and shock-resistant photoelectric pulse generator module for speed detection of rail transit vehicles according to claim 1, 5, or 6, characterized in that, The light-emitting electronic component is an LED lamp bead, and an adjustable potentiometer is connected in series in the power supply circuit of the LED lamp bead. The cover is provided with an adjustment hole corresponding to the position of the adjustable potentiometer.

9. The vibration and shock resistant photoelectric pulse generator module for speed detection of rail transit vehicles according to claim 8, characterized in that, The housing is filled with a waterproof sealant layer that covers the circuit board, and the waterproof sealant layer is flush with the end face of the adjustable potentiometer.

10. The vibration- and shock-resistant photoelectric pulse generator module for speed detection of rail transit vehicles according to claim 1, 5, or 6, characterized in that, The circuit board is equipped with a push-pull output signal driver chip.

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