A personnel station safety monitoring device for double-end-face grinding machine

Abstract

The application discloses a personnel station safety monitoring device for a double-end-face grinding machine. The device comprises a station table, a controller, a main station plate, a dangerous station plate, a second sensor, an alarm device and a locking mechanism; the main station plate is provided with a missing slot opposite to an observation window of a machine cover, the dangerous station plate is embedded in the missing slot and can be elastically lifted, and when stepped on, the dangerous station plate sinks to a triggering position and is detected by the second sensor; the controller starts the alarm and timing according to the detection result, the alarm is cancelled if the dangerous station plate is left within a first preset time length, and the dangerous station plate is locked at the triggering position by the locking mechanism if the dangerous station plate is continuously stayed, so that the dangerous station plate cannot be reset by itself and the alarm cannot be cancelled by an operator. The device demarcates a forbidden standing range according to a dangerous area contour in front of a grinding wheel, distinguishes between false stepping and staying, and forms a staying state which needs to be reset before being cancelled, so that the station safety management of the grinding machine is facilitated. The application also discloses a micro-roller pin double-end-face grinding machine with the device.

Description

Technical Field

[0001] This invention relates to the field of grinding machine safety protection technology, and in particular to a personnel positioning safety monitoring device for a double-end grinding machine, and a miniature needle roller double-end grinding machine equipped with the device. Background Technology

[0002] Double-end grinding machines can simultaneously grind both ends of a workpiece in one setup, ensuring the overall length of the workpiece, the parallelism of both ends, and the surface quality. They are commonly used equipment for workpiece end face processing.

[0003] During processing, operators need to intermittently check the feeding, discharging, grinding sparks, and grinding fluid supply through the machine hood's observation window. Directly in front of the observation window is the path of the grinding wheel debris, and the tangential direction of the grinding wheel's rotation is the area with the highest risk of debris ejection. In extreme conditions such as grinding wheel breakage, large pieces falling off, or workpieces flying away, hard fragments are ejected at high speed in this direction. The observation window is a damage mitigation component, only reducing the probability of injury from flying debris. Its frame seals and glass corners are weak points, and the glass will develop scratches and age after long-term exposure to grinding debris and grinding fluid, reducing its impact resistance. Therefore, the observation window cannot serve as an absolute safety barrier; the tangential direction of the grinding wheel is always an area that needs to be actively avoided.

[0004] Generalized human presence sensors are difficult to match with the specific contours of the danger zone: their detection range is mostly planar coverage, while the space around the grinding machine is compact, and the sensor installation position and wiring are limited by the equipment structure. It is difficult to make the detection boundary coincide with the boundary of the danger zone by adjusting the angle. At the junction of the safe zone and the danger zone, there is a tendency for false alarms on the safe zone side and missed detections on the danger zone side.

[0005] The regular stampede or approach alarm automatically deactivates after the person leaves, and the alarm deactivation authority is in the hands of the operator. It is impossible to distinguish between a brief accidental stampede and a deliberate lingering, and it is also difficult to record the behavior of entering the danger zone without permission. Therefore, the management personnel cannot use this information to identify and correct violations.

[0006] On the other hand, JB 7741-1995 "Safety Requirements for Metal Cutting Processes", clause 5.4 Machine Tool Start-up, point 8: When the machine tool is running, the operator must not leave the work station and must monitor abnormal noises, vibrations, dimensions, cooling, oil pressure, etc. in the equipment's operating area. If there are any faults (risks) such as grinding wheel breakage, workpiece flying out, jamming, or abnormal oil pressure / coolant, the machine must be stopped immediately. If it is necessary to leave for any reason, the machine should be stopped and the power supply turned off.

[0007] Therefore, there is a need for a station safety monitoring device that can mark the prohibited area according to the outline of the danger zone, distinguish between accidental stepping and lingering, and realize active monitoring of the actual presence of personnel. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a personnel positioning safety monitoring device for a double-end face grinder. The purpose is to ensure that the monitoring range matches the outline of the danger zone in front of the grinding wheel, and to separately handle brief passages and intentional lingering, thereby creating a retention state that the operator cannot erase on their own.

[0009] The device uses a platform as its support base, above which is a main standing plate for personnel to stand normally. A notch is cut into the main standing plate, opposite the observation window of the machine hood. A resiliently adjustable danger plate is embedded within the notch. Because the shape and position of the notch are directly marked according to the danger zone, personnel will only step on the danger plate when they enter the prohibited standing area directly in front of the grinding wheel. The monitoring boundary is determined by the mechanical contour, without relying on the angle adjustment of planar sensors, which helps avoid false alarms and missed detections at the boundary.

[0010] The danger zone panel is normally raised by the second elastic reset component. When stepped on, it sinks to the trigger position against the platform and is detected by the second sensor. Upon receiving the detection signal, the controller activates the alarm device to issue a warning and begins timing: if the person leaves within a first preset time, the danger zone panel rebounds, the detection signal disappears, and the alarm is deactivated; a brief period of time does not interfere with normal operations. If the person remains in the danger zone for the first preset time, the linear drive component of the locking mechanism activates, locking its drive end with the limit engagement part on the danger zone panel, mechanically holding the panel in the trigger position. Because the danger zone panel is locked and cannot rebound, the second sensor continuously outputs a detection signal, and the alarm remains even after the person leaves, unlike a normal stampede alarm which deactivates automatically. This effectively fixes a deliberate stay into a state requiring special reset.

[0011] The device is equipped with a reset switch connected to the controller. Only when the reset switch is triggered will the linear drive retract and release its hold on the danger position plate. To prevent operators from resetting the device themselves, the reset switch is housed in a threaded groove within the warning housing and protected by a threaded block. The threaded block uses a specially shaped drive groove, and only a dedicated torsion device kept by the management personnel can be used to rotate and remove the threaded block. This separates the reset authority from on-site operation, making it easier for management personnel to monitor violations.

[0012] On the normal standing position side, the main standing position plate also adopts a flexible lifting structure and is equipped with a first sensor to determine whether personnel are standing in the normal standing position area. If personnel leave without authorization, a warning device will issue an alert. The device is also set in a position verification unit, which periodically requires personnel to manually trigger a confirmation button at a second preset time interval, and has a confirmation window with a third preset time interval to distinguish between personnel actually being in position and situations where objects are pressing on the main standing position plate. The monitoring slots where each sensor is located are sealed with transparent covers, which not only do not block the sensing signals but also block grinding fluid and grinding debris, which is conducive to the stable operation of the sensors in the grinding environment. The present invention also provides a miniature needle roller double-end face grinder equipped with the above-mentioned personnel standing safety monitoring device. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the top axial structure of the main station plate and the dangerous station plate of the present invention in a disassembled state;

[0014] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0015] Figure 3 This is a schematic diagram of the top axial side structure of the present invention in its assembled state;

[0016] Figure 4 for Figure 3 A magnified schematic diagram of the local structure at point A;

[0017] Figure 5 This is a schematic diagram of the bottom axial side structure of the present invention in its assembled state;

[0018] Figure 6 This is a schematic diagram of the bottom axial structure of the main station plate and the dangerous station plate of the present invention in a disassembled state;

[0019] Figure 7 This is a schematic diagram of the axonal structure of the present invention after removing the main station plate and the dangerous station plate;

[0020] Figure 8 for Figure 7 A magnified schematic diagram of the local structure at point B;

[0021] Figure 9 for Figure 7 A magnified schematic diagram of the structure at point C in the middle;

[0022] Figure 10 This is a system block diagram of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 1—Miniature needle roller double-end face grinder; 2—Station platform; 201—Leave-of-station warning buzzer; 202—First guide socket; 203—Second guide socket; 204—First storage slot; 205—Second storage slot; 206—Transparent cover plate; 207—Rear monitoring slot; 208—First proximity switch; 209—Front monitoring slot; 2010—Second proximity switch; 2011—Mounting slot; 2012—Linear drive component; 3—Main station plate; 301—Slot notch; 302—First guide rod; 303—First elastic reset component; 304—First sensing component; 4—Danger station Plate; 401—Limit baffle; 402—Limit insertion hole; 403—Second guide rod; 404—Second elastic reset component; 405—Second sensing component; 5—Warning housing; 501—In-position indicator light; 502—Confirmation button; 503—Intrusion warning light; 504—Intrusion alarm buzzer; 505—In-position indicator buzzer; 506—Threaded groove; 507—Reset switch; 508—Period timer; 509—Dwell timer; 5010—Controller; 5011—Confirmation window timer; 6—Threaded block; 601—Irregularly shaped drive groove; 7—Special torsion component; 701—Wrench socket. Detailed Implementation

[0024] To more clearly illustrate the technical solution of the present invention, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0025] like Figures 1 to 10 As shown, the personnel positioning safety monitoring device in this embodiment is installed on the front side of the machine cover of the miniature needle roller double-end face grinder 1. The whole device includes a positioning platform 2, a controller 5010, a main positioning plate 3, a danger positioning plate 4, a first sensor, a second sensor, an alarm device, a locking mechanism, a leave-of-post reminder, an on-site verification unit, and a warning housing 5. The controller 5010 is a microcontroller and shares the same power supply line as the miniature needle roller double-end face grinder 1. When the grinder is turned on, the controller 5010 is powered on synchronously with the power supply. The warning housing 5 is fixed to the front side of the machine cover. The front end of the housing is equipped with a position indicator light 501, a confirmation button 502 and an intrusion warning light 503. The top end is equipped with an intrusion alarm buzzer 504 and a position indicator buzzer 505. The interior is equipped with a periodic timer 508, a dwell timer 509 and a confirmation window timer 5011. The alarm device in this embodiment consists of an intrusion warning light 503 and an intrusion alarm buzzer 504. The off-duty reminder is an off-duty reminder buzzer 201. All of the above devices are electrically connected to the controller 5010.

[0026] like Figures 1 to 3As shown, the standing platform 2 is installed at the bottom front of the machine cover, and the main standing plate 3 is located above the standing platform 2, serving as a standing platform for the operator's normal work. The main standing plate 3 has a notch 301, which is opposite to the observation window of the machine cover, and its outline is marked according to the prohibited standing area directly in front of the grinding wheel; the danger standing plate 4 is embedded in the notch 301 and is used to divide the normal standing area from the danger area in front of the grinding wheel.

[0027] The lifting and detection structure of the danger station plate 4 is as follows: Figure 5 , Figure 6 , Figure 9 As shown. Two second guide rods 403 are fixed to the bottom surface of the hazardous position plate 4. Two second guide holes 203 and a second storage groove 205 are correspondingly opened on the top surface of the position platform 2. The second guide rods 403 are inserted into the second guide holes 203 and slide along them. The second elastic reset member 404 is sleeved around the second guide rods 403, with its top end connected to the bottom surface of the hazardous position plate 4 and its bottom end resting on the bottom of the second storage groove 205. A front monitoring groove 209 is opened on the top surface of the position platform 2. A second proximity switch 2010, which serves as the detection end of the second sensor, is installed in the groove. The second sensing element 405 is embedded in the bottom surface of the hazardous position plate 4. When the second elastic reset member 404 is in its natural state, the bottom surface of the danger station plate 4 does not contact the station platform 2, and the second sensing member 405 is outside the sensing range of the second proximity switch 2010; when the danger station plate 4 is stepped on and sinks to the trigger position that is in contact with the station platform 2, the second sensing member 405 enters the sensing range of the second proximity switch 2010, and the second proximity switch 2010 sends a detection signal to the controller 5010.

[0028] The main station platform 3 adopts a corresponding flexible lifting structure. For example... Figures 5 to 7 , Figure 9 As shown, the bottom surface of the main station plate 3 is fixed with the first guide rods 302 near the four corners. The top surface of the station platform 2 is provided with the first guide hole 202 and the first storage groove 204 at the corresponding positions. The first guide rods 302 are slidably inserted into the first guide hole 202. The first elastic reset member 303 is sleeved around the first guide rod 302. Its top end is connected to the bottom surface of the main station plate 3 and its bottom end is connected to the bottom of the first storage groove 204. In its natural state, it lifts the main station plate 3 without contacting the station platform 2. A rear monitoring slot 207 is opened on the top surface of the platform 2. A first proximity switch 208, which serves as the first sensor detection end, is installed in the slot. A first sensing element 304 is embedded in the bottom surface of the main platform 3. When a person stands on the main platform 3 and overcomes the elastic force of the first elastic reset element 303 to sink and fit against the platform 2, the first sensing element 304 enters the sensing range of the first proximity switch 208. After the person leaves, the first elastic reset element 303 lifts the main platform 3, and the first sensing element 304 exits the sensing range.

[0029] like Figure 7 , Figure 9As shown, transparent cover plates 206 are sealed and installed near the top openings of both the rear monitoring slot 207 and the front monitoring slot 209. In this embodiment, the transparent cover plate 206 is a transparent glass plate. The transparent cover plate 206 does not block the sensing signals of the first proximity switch 208 and the second proximity switch 2010, while isolating the monitoring slot from the outside, preventing grinding fluid, metal shavings and debris from entering the slot, and reducing the possibility of the proximity switches becoming contaminated or damp and failing.

[0030] Locking mechanisms are used to maintain the stationary state. For example... Figure 2 , Figure 3 , Figure 9 As shown, a limiting baffle 401 is fixed at the front end of the danger station plate 4, and a limiting insertion hole 402 is opened on the limiting baffle 401 along the front-rear direction; an installation groove 2011 is opened on the front surface of the station platform 2, and a miniature electric cylinder as a linear drive component 2012 is installed in the groove. In the natural state, the danger station plate 4 is raised, and the limiting insertion hole 402 is misaligned with the drive end of the linear drive component 2012; when the danger station plate 4 sinks to the trigger position, the limiting insertion hole 402 and the drive end are coaxially opposite. After the second proximity switch 2010 detects that the danger station plate 4 has reached the trigger position, the controller 5010 activates the intrusion warning light 503 and the intrusion alarm buzzer 504, and the dwell timer 509 starts timing for a first preset duration, which is five seconds in this embodiment. If the person leaves within five seconds, the second elastic reset member 404 causes the danger station plate 4 to rebound, the second sensing member 405 exits the sensing range, the dwell timer 509 is reset, and the intrusion warning light 503 and the intrusion alarm buzzer 504 are turned off. If the person does not leave after five seconds, the controller 5010 drives the driving end of the linear drive member 2012 to extend horizontally and insert into the limit socket 402, so that the danger station plate 4 cannot rebound under the action of the second elastic reset member 404, thus being locked in the trigger position. At this time, even if the person leaves, the second proximity switch 2010 continues to output a detection signal, and the alarm is maintained.

[0031] Reset and permission structure as follows Figure 4 , Figure 8As shown. A threaded groove 506 is formed on the right side of the front face of the warning housing 5. A tactile switch, which serves as a reset switch 507, is installed in the groove. The reset switch 507 is the operating element for unlocking. A threaded block 6 is threadedly connected to the threaded groove 506, and the threaded block 6 blocks the reset switch 507. An irregularly shaped drive groove 601 is formed at the center of the front face of the threaded block 6. In this embodiment, the irregularly shaped drive groove 601 is an elliptical groove, which cannot be used with ordinary screwdrivers and Allen wrenches. A special torsion member 7 is inserted into the irregularly shaped drive groove 601. A hexagonal wrench socket 701 is formed at the center of the special torsion member 7. A standard hexagonal wrench can be connected to drive the special torsion member 7 and the threaded block 6 to rotate. The special torsion member 7 is kept by the management personnel who do not operate the grinding machine. Without the special torsion member 7, the on-site operator cannot remove the threaded block 6 or access the reset switch 507. After the management personnel arrive, they use the special torsion tool 7 to unscrew the threaded block 6 and press the reset switch 507. The controller 5010 drives the linear drive 2012 to retract, the danger station plate 4 is lifted under the action of the second elastic reset tool 404, the second sensor 405 is removed from the sensing range, the intrusion warning light 503 and the intrusion alarm buzzer 504 are turned off, and the device returns to the monitoring state.

[0032] The on-duty prompt in the normal station area is achieved through the cooperation of the first sensor and the off-duty prompt buzzer 201. After the controller 5010 is powered on, it reads the signal of the first proximity switch 208. When the first sensing element 304 is not within the sensing range, that is, when there is no personnel pressing on the main station plate 3, the controller 5010 activates the off-duty prompt buzzer 201 to emit an audible prompt. The prompt turns off after the personnel stand on the main station plate 3, thereby prompting the operator to be in the normal station area during equipment operation.

[0033] The on-site verification unit is used to distinguish between the actual presence of personnel and the situation where an object is covering the main station plate 3. Its components are as follows: Figure 10 As shown. The periodic timer 508 counts according to a second preset duration, which in this embodiment is ten minutes. When ten minutes have elapsed, the controller 5010 illuminates the presence indicator light 501, and simultaneously, the confirmation window timer 5011 begins counting for a third preset duration, which in this embodiment is two minutes. If the on-site personnel press the confirmation button 502 within two minutes, the controller 5010 turns off the presence indicator light 501 and restarts the ten-minute countdown from the periodic timer 508. If the confirmation button 502 is not triggered within two minutes, the controller 5010 activates the presence indicator buzzer 505, which remains activated until the confirmation button 502 is pressed. Objects pressing on the main station plate 3 cannot trigger the confirmation button 502, thus this unit can complement the first sensor, reducing the possibility of faking a presence status with an object.

[0034] The above embodiments use a miniature needle roller double-end grinding machine as an example to illustrate the structure and working process of this device. This device can also be installed on other double-end grinding machines with observation windows and fixed front dangerous positions. In addition to miniature electric cylinders, the linear drive component 2012 can also be an electromagnet drive pin or other components that can realize linear extension and retraction of the drive end. In addition to inductive proximity switches, the first sensor and the second sensor can also be limit switches or other detection elements that can respond to the sinking position of the plate. These equivalent substitutions are all within the scope of the technical solution of this invention.

Claims

1. A personnel positioning safety monitoring device for a double-end face grinder, characterized in that, The system includes a platform, a controller, a main platform, a danger platform, a second sensor, an alarm device, and a locking mechanism. The main platform is positioned above the platform and has a notch that aligns with the observation window of the double-end face grinder's hood. The danger platform is fitted into the notch and is movable relative to the platform via a second elastic reset member. In its natural state, the danger platform is raised relative to the platform; when stepped on, it lowers to a trigger position against the platform. The second sensor detects whether the danger platform has reached the trigger position and is electrically connected to the controller. The alarm device is also electrically connected to the controller. The locking mechanism... The device includes a linear drive and a limiting engagement part disposed on the hazardous position plate. The linear drive is electrically connected to the controller. When the hazardous position plate is in the triggered position, the limiting engagement part is opposite to the drive end of the linear drive. The controller is configured to activate the alarm device and start timing when the second sensor detects that the hazardous position plate has reached the triggered position. If the hazardous position plate leaves the triggered position within a first preset time period, the alarm device is deactivated. If the hazardous position plate is still in the triggered position after the first preset time period, the drive end of the linear drive extends and locks with the limiting engagement part, locking the hazardous position plate in the triggered position.

2. The personnel positioning safety monitoring device for a double-end face grinder according to claim 1, characterized in that, The bottom surface of the hazardous position board is fixed with a second guide rod. The position platform has a second guide hole and a second storage slot. The second guide rod is slidably inserted into the second guide hole. The second elastic reset member is sleeved around the second guide rod. The top end of the second elastic reset member is connected to the bottom surface of the hazardous position board, and the bottom end is connected to the bottom of the second storage slot. The second sensor includes a second proximity switch and a second sensing element. The second proximity switch is installed in the front monitoring slot of the position platform. The second sensing element is embedded in the bottom surface of the hazardous position board. In its natural state, the second sensing element is outside the sensing range of the second proximity switch. When the hazardous position board reaches the trigger position, the second sensing element enters the sensing range of the second proximity switch.

3. The personnel positioning safety monitoring device for a double-end face grinder according to claim 1, characterized in that, The limiting engagement part includes a limiting baffle fixed to the front end of the dangerous station plate and a limiting insertion hole opened in the limiting baffle. The front end face of the station platform is provided with an installation groove, and the linear drive is installed in the installation groove. In the natural state, the limiting insertion hole is misaligned with the drive end of the linear drive. When the dangerous station plate reaches the trigger position, the limiting insertion hole is coaxially opposite to the drive end of the linear drive, and the drive end extends out and is inserted into the limiting insertion hole.

4. The personnel positioning safety monitoring device for a double-end face grinder according to claim 3, characterized in that, It also includes a reset switch electrically connected to the controller. When the reset switch is triggered, the controller drives the drive end of the linear drive to retract to release the lock, and the danger station plate leaves the trigger position under the action of the second elastic reset member.

5. The personnel positioning safety monitoring device for a double-end face grinder according to claim 4, characterized in that, It also includes a warning housing fixed to the front side of the double-end face grinder cover. The warning housing has a threaded groove, and the reset switch is installed in the threaded groove. A threaded block that blocks the reset switch is threadedly connected in the threaded groove. The threaded block has a special-shaped drive groove. A special torsion member is inserted into the special-shaped drive groove. Only when the special torsion member is engaged with the special-shaped drive groove can the threaded block be rotated and removed to access the reset switch.

6. The personnel positioning safety monitoring device for a double-end face grinder according to claim 1, characterized in that, The main station platform is movable relative to the station platform via a first elastic reset member. A first guide rod is fixed to the bottom surface of the main station platform. The station platform has a first guide hole and a first storage groove that slide into the first guide rod. The first elastic reset member is sleeved around the first guide rod. The top end of the first elastic reset member is connected to the bottom surface of the main station platform, and the bottom end is connected to the bottom of the first storage groove. The system also includes a first sensor for detecting whether the main station platform has sunk. The first sensor includes a first proximity switch and a first sensing element. The first proximity switch is installed in the rear monitoring groove of the station platform. The first sensing element is embedded in the bottom surface of the main station platform. In its natural state, the first sensing element is outside the sensing range of the first proximity switch. When the main station platform is pressed down and sinks, the first sensing element enters the sensing range of the first proximity switch.

7. The personnel positioning safety monitoring device for a double-end face grinder according to claim 6, characterized in that, It also includes an off-duty reminder device electrically connected to the controller. The controller reads the detection signal of the first sensor. When the first sensor does not detect the sinking of the main station plate, the controller activates the off-duty reminder device.

8. The personnel positioning safety monitoring device for a double-end face grinder according to claim 1, characterized in that, It also includes an in-situ verification unit, which includes an in-situ indicator light, a confirmation button, an in-situ indicator buzzer, a periodic timer, and a confirmation window timer, all electrically connected to the controller. The periodic timer counts for a second preset duration. When the second preset duration is reached, the controller activates the in-situ indicator light and the confirmation window timer. The confirmation window timer counts for a third preset duration. When the confirmation button is triggered within the third preset duration, the controller turns off the in-situ indicator light and restarts the periodic timer. When the confirmation button is not triggered after the third preset duration, the controller activates the in-situ indicator buzzer.

9. The personnel positioning safety monitoring device for a double-end face grinder according to claim 1, characterized in that, The station platform has a front monitoring slot corresponding to the second sensor. A transparent cover is sealed near the top opening of the front monitoring slot. The transparent cover allows the sensing signal of the second sensor to pass through and isolates the front monitoring slot from the external grinding fluid and grinding debris.

10. A miniature needle roller double-end face grinder, characterized in that, Includes a personnel positioning safety monitoring device for a double-end face grinder as described in any one of claims 1 to 9.

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