A device for detecting the deviation of a cutter holder of a die sinking machine

Abstract

The application relates to the technical field of detection of the deviation of a cutter holder of a cam machine, in particular to a detection device for the deviation of a cutter holder of a cam machine, to solve the problem that a slight deviation of the cutter holder leads to an increase in machining errors, which comprises a detection piece and a notification assembly, the detection piece is installed on a cutter holder table to move synchronously with the cutter holder, the notification assembly is installed on a rack, the notification assembly is electrically connected with the detection piece, the detection piece detects the deviation of the cutter holder, and the notification assembly notifies the staff; a compensation assembly is further arranged on the cutter holder table, the compensation assembly resets and compensates the deviated cutter holder to reduce the degree of the deviation of the cutter holder. The application has the effect of reducing the influence of the deviation of the cutter holder on the machining products.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of detection of offset of a tool holder of a cam machine, in particular to a detection device for offset of a tool holder of a cam machine. BACKGROUND

[0002] With the rapid development of modern manufacturing industry, high-precision machine tool processing equipment gradually becomes the mainstream. Especially in the field of precision machining, such as numerical control cam machine, it is widely used in the aerospace, automobile manufacturing and other industries, and has very high requirements on the size and shape tolerance of parts. The efficient operation of these devices not only improves the production efficiency, but also greatly improves the quality and consistency of products.

[0003] However, with the long-term use of the equipment, due to the change of environmental temperature, the natural wear of mechanical parts and other factors, the key part of the machine tool, the tool holder, may have a slight offset, which will directly affect the machining precision and further affect the quality of the final product, so it needs to be improved. SUMMARY

[0004] In order to reduce the influence of tool holder offset on the processed product, the application provides a detection device for offset of a tool holder of a cam machine.

[0005] The detection device for offset of a tool holder of a cam machine provided by the application adopts the following technical scheme:

[0006] A detection device for offset of a tool holder of a cam machine, comprising a detection piece and a notification component, the detection piece is installed on a tool holder table to move synchronously with the tool holder, the notification component is installed on a machine frame, the notification component is electrically connected with the detection piece, the detection piece detects the offset of the tool holder, and the notification component notifies the workers; The tool holder table is also provided with a compensation component, the compensation component resets and compensates the offset tool holder to reduce the degree of tool holder offset.

[0007] By adopting the above technical scheme, the detection device for offset of a tool holder of a cam machine can monitor the offset of the tool holder in real time, and timely alarm to the workers through the notification component, so as to avoid the machining error caused by the offset of the tool holder. At the same time, the compensation component can automatically reset and compensate the offset tool holder before the workers repair the offset problem of the tool holder, effectively reducing the influence of tool holder offset on machining precision and improving the quality of products.

[0008] Preferably, the detection member is a linear encoder, the notification assembly includes an alarm member and a controller, the detection member is installed on the tool holder table and moves synchronously with the tool holder, the alarm member and the controller are installed on the rack, the detection member, the alarm member and the compensation assembly are electrically connected with the controller, the linear encoder sends an offset signal, the controller receives the offset signal and judges whether the offset exceeds a preset offset threshold, if the offset exceeds the preset offset threshold, the controller controls the alarm member to start and the compensation assembly to start to reset and compensate.

[0009] By adopting the above technical scheme, when the tool holder deviates, the linear encoder can detect the position change of the tool holder in real time and send an offset signal to the controller. After receiving the offset signal, the controller will judge whether the offset exceeds the preset offset threshold. If the offset exceeds the preset offset threshold, the controller will start the alarm member to remind the staff to handle in time, and at the same time control the compensation assembly to start to reset and compensate the deviated tool holder. This series of operations not only can discover and correct the deviation of the tool holder in time, but also can effectively reduce the machining error caused by the deviation of the tool holder and improve the quality of the processed products.

[0010] Preferably, the compensation assembly includes a compensation motor, a compensation guide disc and a compensation member, the compensation motor is installed at the tool holder table, the compensation guide disc is installed on the rotating shaft of the compensation motor, and the compensation member is movably installed at the tool holder table. The compensation guide disc rotates to control the compensation member to approach the tool holder to reset and compensate the deviated tool holder. The compensation motor is electrically connected with the controller, and the controller can control the compensation motor to rotate by an angle corresponding to the offset distance.

[0011] By adopting the above technical scheme, the compensation motor can rotate by a corresponding angle under the control of the controller to drive the compensation guide disc to rotate, so as to make the compensation member approach the deviated tool holder to realize accurate reset and compensation. This design effectively reduces the influence of the deviation of the tool holder on the machining precision and improves the quality stability of the products. At the same time, the controller can monitor and adjust the action of the compensation motor in real time to ensure the accuracy and reliability of the compensation process.

[0012] Preferably, a primary positioning key is arranged on the rotating shaft of the compensation motor, and a primary matching key is arranged on the compensation guide disc. The compensation guide disc is installed on the rotating shaft of the compensation motor so that the primary positioning key is aligned with the primary matching key.

[0013] By adopting the above technical scheme, the accurate alignment between the rotating shaft of the compensation motor and the compensation guide disc is ensured, the compensation accuracy caused by poor alignment is avoided, the working reliability of the compensation assembly is improved, and the influence of the deviation of the tool holder on the processed products is further reduced.

[0014] Preferably, the tool holder table further comprises a lifting assembly, the lifting assembly comprising a lifting cylinder, a lifting platform and a lifting linkage, the lifting cylinder being installed below the tool holder table, the lifting platform being installed on the piston rod of the lifting cylinder, and the compensation assembly being installed on the lifting platform; the tool holder table is provided with a lifting opening for the compensation assembly to pass through, and the tool holder table is movably provided with a baffle at the lifting opening, the baffle being capable of closing the lifting opening; the lifting cylinder moves the baffle through the lifting linkage to open the lifting opening for the compensation assembly to pass through and for the compensation assembly to reset the offset tool holder.

[0015] By adopting the above technical scheme, when the tool holder is offset, the lifting cylinder drives the lifting platform to rise, and drives the compensation assembly to pass through the lifting opening, and at the same time, the lifting cylinder moves the baffle through the lifting linkage to open the lifting opening, so as to ensure that the compensation assembly can smoothly extend and reset the offset tool holder, thereby improving the efficiency of tool holder offset detection and reset compensation, reducing the machining error caused by tool holder offset, and improving the quality of the machined product.

[0016] Preferably, the lifting linkage comprises a linkage soft rope and a linkage fixed rod, the linkage fixed rod being installed on one side of the lifting cylinder, and one end of the linkage soft rope being connected with the baffle and the other end being connected with the bottom of the lifting platform through the linkage fixed rod.

[0017] By adopting the above technical scheme, when the offset tool holder needs to be reset and compensated, the lifting cylinder drives the lifting platform to rise, and the compensation assembly rises and extends through the lifting opening at the same time, and at the same time, the piston rod of the lifting cylinder drives the baffle to move through the action of the linkage soft rope and the linkage fixed rod, so that the baffle moves away from the lifting opening, thereby enabling the compensation assembly to smoothly pass through the lifting opening and achieving accurate reset and compensation of the offset tool holder. This design ensures the coordination and reliability of the action of the compensation assembly, and improves the efficiency and accuracy of the reset and compensation of the tool holder.

[0018] Preferably, the lifting linkage further comprises a linkage guide rod, the linkage guide rod being rotatably connected to the bottom of the tool holder table through a torsion spring, the linkage guide rod being located at the farthest position of the baffle, and one end of the linkage soft rope being connected with the baffle and the other end being connected with the bottom of the lifting platform through the linkage guide rod and the linkage fixed rod in sequence.

[0019] By adopting the above technical scheme, the linkage guide rod makes the movement path of the linkage soft rope more stable, avoids the problem of unstable movement of the baffle caused by winding or loosening of the soft rope, and improves the accuracy and reliability of the up and down movement of the compensation assembly. At the same time, the position design of the linkage guide rod ensures that the baffle can still move smoothly when it is at the farthest position, further ensuring the accuracy of the reset and compensation of the offset tool holder by the compensation assembly.

[0020] Preferably, the compensation member is provided with a guide member, the guide member comprising a guide block and a guide roller, the guide block being installed on the top of the compensation member, the side wall of the guide block being capable of aligning with the side wall of the compensation member close to the tool holder, and the guide roller being rotatably connected to the top of the guide block and capable of being tangent to the aligned side wall surface of the guide block and the compensation member.

[0021] By adopting the above technical solution, the guide member on the compensation member can ensure that the compensation member maintains accurate direction when approaching the tool holder, avoiding inaccurate reset compensation due to deviation of the compensation member. The design of the guide block and the guide roller enables the compensation member to move smoothly along the predetermined path, further improving the accuracy and reliability of the reset compensation. The provision of the guide roller can also reduce the friction between the compensation member and the tool holder, preventing damage to the tool holder.

[0022] Preferably, the radius of the guide roller is not less than the preset offset threshold of the tool holder.

[0023] By adopting the above technical solution, the radius of the guide roller is not less than the preset offset threshold of the tool holder, ensuring that the guide roller can effectively contact and guide the tool holder when the compensation member performs reset compensation on the tool holder, preventing compensation failure due to insufficient size of the guide roller, improving the accuracy and reliability of the compensation, and further reducing the impact of tool holder offset on the processed product.

[0024] Preferably, the alarm member is a sound-light lamp or a loudspeaker.

[0025] By adopting the above technical solution, when the tool holder deviates, the linear encoder detects the deviation signal and sends it to the controller, which determines whether the deviation exceeds the preset threshold. If the threshold is exceeded, the controller will start the sound-light lamp or the loudspeaker to issue an alarm, reminding the staff to handle it in time. This can quickly respond to the tool holder deviation situation, effectively reduce the processing error caused by tool holder deviation, and improve the quality and production efficiency of the product.

[0026] In summary, the present application has the following at least one beneficial technical effect:

[0027] 1. The tool holder deviation can be monitored in real time, and the notification component can issue an alarm to the staff in time, thereby avoiding processing errors caused by tool holder deviation. At the same time, the compensation component can automatically reset the deviated tool holder before the staff repairs the tool holder deviation, effectively reducing the impact of tool holder deviation on processing accuracy and improving product quality.

[0028] 2. The compensation motor can rotate the corresponding angle under the control of the controller, drive the compensation guide disc to rotate, and then make the compensation part close to the offset tool holder, realize accurate reset compensation. This design effectively reduces the influence of tool holder offset on machining accuracy and improves the quality stability of the product. At the same time, the controller can monitor and adjust the action of the compensation motor in real time, ensuring the accuracy and reliability of the compensation process;

[0029] 3. The radius of the guide roller is not less than the preset offset threshold of the tool holder, which ensures that the guide roller can effectively contact and guide the tool holder when the compensation part resets the tool holder, prevents compensation failure due to insufficient size of the guide roller, improves the accuracy and reliability of the compensation, and further reduces the influence of tool holder offset on the machined product. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic diagram of a tool holder offset detection device in the walking center machine of the embodiment of the present application.

[0031] Figure 2 is a sectional view for embodying the positional relationship between the rising assembly and the compensation assembly in the embodiment of the present application.

[0032] Figure 3 is a structural schematic diagram for embodying the specific structure of the compensation assembly in the embodiment of the present application.

[0033] Figure 4 is Figure 3 is an enlarged schematic diagram of A in

[0034] BRIEF DESCRIPTION OF DRAWINGS: 1, detection part; 2, notification assembly; 21, alarm part; 3, tool holder table; 31, rising port; 32, baffle; 4, compensation assembly; 41, compensation motor; 411, initial positioning key; 42, compensation guide disc; 421, initial matching key; 43, compensation part; 44, guide part; 441, guide block; 442, guide roller; 5, rising assembly; 51, rising cylinder; 52, rising platform; 53, rising linkage; 531, linkage soft rope; 532, linkage fixed rod; 533, linkage guide rod. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings Figures 1-4 The present application will be further described in detail.

[0036] The embodiment of the present application discloses a walking center machine tool holder offset detection device. Referring to Figure 1The heart machine tool holder offset detection device includes a detection piece 1 and a notification component 2. The detection piece 1 is installed on the tool holder table 3 to move synchronously with the tool holder. The notification component 2 is installed on the machine frame and is electrically connected with the detection piece 1. The detection piece 1 detects the tool holder offset, and the notification component 2 notifies the staff. The tool holder table 3 is also provided with a rising component 5 and a compensation component 4. The rising component 5 is installed at the bottom of the tool holder table 3, and the compensation component 4 is installed on the rising component 5. The compensation component 4 can reset and compensate the offset tool holder to reduce the tool holder offset degree.

[0037] The offset of the tool holder can be monitored in real time, and the notification component 2 can timely alarm the staff, so as to avoid the machining error caused by the tool holder offset. At the same time, the rising component 5 rises from below the tool holder table 3, and the compensation component 4 rises to the tool holder height. At this time, the compensation component 4 can automatically reset and compensate the offset tool holder before the staff repairs the tool holder offset problem, effectively reduces the influence of the tool holder offset on the machining precision, and improves the product quality.

[0038] Referring to Figure 1 The detection piece 1 can be a linear encoder or other types of sensors, such as an optical encoder, a magnetostrictive sensor, etc. The detection piece 1 is installed on the tool holder table 3 by bolts and moves synchronously with the tool holder. The detection piece 1 moving synchronously with the tool holder can detect the slight offset of the tool holder in real time. The installation position of the detection piece 1 can be selected at the edge of the tool holder table 3 to better capture the motion trajectory of the tool holder. The shell of the linear encoder can be made of high-strength aluminum alloy to improve its durability and anti-interference ability.

[0039] The notification component 2 includes an alarm piece 21 and a controller. The alarm piece 21 can be an audible and visual light or a loudspeaker, which is used to alarm the staff when the tool holder offset exceeds the preset threshold. The controller can be a PLC or a single-chip microcomputer. The controller is installed on the machine frame of the heart machine and is responsible for receiving the offset signal from the linear encoder and judging and processing. The controller, the detection piece 1, the alarm piece 21, the rising component 5 and the compensation component 4 are electrically connected through cables or wireless communication mode to ensure the reliability and real-time performance of signal transmission.

[0040] When the tool holder is offset, the detection piece 1 can detect the position change of the tool holder in real time and send the offset signal to the controller. After receiving the offset signal, the controller judges whether the offset exceeds the preset offset threshold. If the preset offset threshold is exceeded, the controller will start the alarm piece 21 to remind the staff to handle in time, and at the same time, the rising component 5 and the compensation component 4 are controlled to start in turn to reset and compensate the offset tool holder.

[0041] Referring to Figure 2The ascending assembly 5 comprises an ascending cylinder 51, an ascending platform 52 and an ascending linkage 53. The ascending cylinder 51 is installed below the tool holder table 3 through a support, and the ascending cylinder 51 is electrically connected with the controller. The piston rod of the ascending cylinder 51 is upward and connected with the ascending platform 52. At this time, the ascending platform 52 is horizontally arranged, and the compensation assembly 4 is fixed on the ascending platform 52.

[0042] The tool holder table 3 is provided with an ascending opening 31 through which the compensation assembly 4 passes. The ascending opening 31 is movably provided with a baffle 32. The tool holder table 3 is provided with a frame at the edge of the ascending opening 31 at the bottom. The baffle 32 is inserted into the frame, and the frame plays a limiting and supporting role for the baffle 32. The baffle 32 is connected with the ascending linkage 53. The ascending cylinder 51 controls the ascending linkage 53 so as to move the baffle 32 under the driving of the ascending cylinder 51, and controls the baffle 32 to open or close the ascending opening 31.

[0043] The ascending linkage 53 comprises a linkage fixed rod 532 and a linkage guide rod 533. The linkage fixed rod 532 is installed on one side of the ascending cylinder 51 through a frame. The linkage guide rod 533 is rotatably connected to the bottom of the tool holder table 3 through a torsion spring, and is located at the farthest position of the baffle 32. The baffle 32 is connected with a linkage soft rope 531 at the end far away from the tool holder. In the embodiment, the linkage soft rope 531 is a metal soft rope. The end of the linkage soft rope 531 far away from the baffle 32 is sequentially wound around the linkage guide rod 533 and the linkage fixed rod 532, and is connected with the bottom of the ascending platform 52. In this way, when the ascending cylinder 51 acts, the linkage soft rope 531 will drive the baffle 32 to move, so as to open the ascending opening 31, and the compensation assembly 4 can smoothly pass through and reset the offset tool holder.

[0044] When the detection piece 1 detects that the tool holder offset exceeds the threshold value, the controller controls the ascending cylinder 51 to start. The piston rod of the ascending cylinder 51 extends to make the ascending platform 52 ascend. At this time, the baffle 32 is synchronously opened under the action of the linkage soft rope 531. When the ascending platform 52 moves to be flush with the top wall of the tool holder table 3, the piston rod of the ascending cylinder 51 completes the ascending. At this time, the compensation assembly 4 compensates the position of the offset tool holder.

[0045] Referring to Figure 3 and Figure 4The compensation assembly 4 comprises a compensation motor 41, a compensation guide disc 42 and a compensation piece 43. The compensation motor 41 is mounted on the lifting platform 52 by bolts, and the rotation speed and torque thereof can be selected according to actual requirements. The compensation guide disc 42 is mounted on the rotating shaft of the compensation motor 41, and the compensation guide disc 42 is an inclined guide disc. The compensation guide disc 42 can be connected with the rotating shaft of the compensation motor 41 through a key groove to ensure the coaxiality therebetween. Specifically, the rotating shaft of the compensation motor 41 is integrally formed with a primary positioning key 411, and the compensation guide disc 42 is integrally formed with a primary matching key 421. The compensation guide disc 42 is mounted on the rotating shaft of the compensation motor 41 so that the primary positioning key 411 is aligned with the primary matching key 421.

[0046] The compensation piece 43 is movably mounted on the lifting platform 52. Specifically, the compensation piece 43 is selected according to the type of the tool holder and is slidably mounted on the lifting platform 52. The compensation piece 43 is integrally formed with a straight rod at one end close to the compensation guide disc 42. The lifting platform 52 is provided with a square frame through which the straight rod penetrates. The end of the straight rod away from the compensation piece 43 always abuts against the compensation guide disc 42, and the end of the straight rod away from the compensation piece 43 is an arc surface. A spring is further sleeved on the straight rod, one end of the spring abuts against the square frame of the lifting platform 52, and the other end of the spring abuts against the compensation guide disc 42 through a soft pad.

[0047] When the compensation motor 41 rotates, the inclined surface of the compensation guide disc 42 rotates, thereby pushing the compensation piece 43 towards the direction of the offset tool holder to reset and compensate the offset tool holder. After the compensation guide disc 42 is reset, the compensation piece 43 can also be reset under the action of the spring. The compensation motor 41 is electrically connected with a controller. The controller can control the compensation motor 41 to rotate by a corresponding angle according to the detected offset distance, thereby realizing accurate reset compensation.

[0048] The compensation piece 43 is provided with a guide piece 44, which comprises a guide block 441 and a guide roller 442. The guide block 441 is clamped and fixed on the top of the compensation piece 43, and the side wall thereof can be aligned with the side wall of the compensation piece 43 close to the tool holder. The guide roller 442 is rotatably connected to the top of the guide block 441 through a shaft, and the guide roller 442 can be tangent to the aligned side wall surface of the guide block 441 and the compensation piece 43 to play a guiding role. The radius of the guide roller 442 is not less than the preset offset threshold of the tool holder, so as to ensure that the compensation piece 43 can smoothly reset when approaching the tool holder.

[0049] The implementation principle of the tool holder offset detection device in the embodiment of the application is as follows: when the tool holder is offset, the detection piece 1 can detect the position change of the tool holder in real time and send an offset signal to the controller. After the controller receives the offset signal, it is judged whether the offset exceeds the preset offset threshold. If the preset offset threshold is exceeded, the controller will start the alarm piece 21 to remind the staff to handle in time, and at the same time control the lifting cylinder 51 to start. The piston rod of the lifting cylinder 51 extends to make the lifting platform 52 rise. At this time, the baffle 32 is opened synchronously under the action of the linkage soft rope 531, and when the lifting platform 52 moves to the top wall of the tool holder table 3, the piston rod of the lifting cylinder 51 is completed. Rise; at this time, the compensation motor 41 starts, and the compensation motor 41 rotates to drive the compensation guide disc 42 to rotate. The angle of the inclined surface of the compensation guide disc 42 changes during rotation to make the compensation piece 43 move towards the direction of the tool holder, so that the tool holder moves to the initial position to realize compensation. Effectively reduce the influence of tool holder offset on machining precision, improve the quality of products.

[0050] If the edge of the tool holder is located at the position of the rising port 31 in the process of the compensation piece 43 rising, the guide roller 442 can guide the tool holder to the initial position so that the compensation piece 43 can smoothly rise to the specified position.

[0051] The above are preferred embodiments of the application, not to limit the protection scope of the application, therefore: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A tool holder offset detection device for a Swiss-type lathe, characterized in that: The system includes a detection component (1) and a notification component (2). The detection component (1) is mounted on the tool holder (3) to move synchronously with the tool holder. The notification component (2) is mounted on the frame and is electrically connected to the detection component (1). The detection component (1) detects tool holder offset, and the notification component (2) notifies the operator. The tool holder (3) is also equipped with a compensation component (4), which resets and compensates for the offset tool holder to reduce the offset. The detection component (1) is a linear encoder. The notification component (2) includes an alarm component (21) and a controller. The linear encoder is mounted on the tool holder (3) and moves synchronously with the tool holder. The alarm component (21) and the controller are both mounted on the frame. The detection component (1), the alarm component (21), and the compensation component (4) are all electrically connected to the controller. The detection component (1) sends an offset signal. The controller receives the offset signal and determines whether it exceeds the preset offset threshold. If it exceeds the preset offset threshold, the controller controls the alarm component (21) to start and the compensation component (4) to start reset compensation. The compensation component (4) includes a compensation motor (41), a compensation guide plate (42), and a compensation component (43). The compensation motor (41) is mounted at the tool holder (3). The compensation guide plate (42) is mounted on the rotating shaft of the compensation motor (41). The component (43) is movably installed on the tool holder (3). The compensation guide plate (42) rotates to control the compensation component (43) to move closer to the tool holder, so as to reset and compensate for the offset tool holder. The compensation motor (41) is electrically connected to the controller, and the controller can control the compensation motor (41) to rotate at an angle corresponding to the offset distance. The tool holder (3) also includes a lifting assembly (5), which includes a lifting cylinder (51), a lifting platform (52), and a lifting linkage (53). The lifting cylinder (51) is installed below the tool holder (3), and the lifting platform (52) is installed on the piston rod of the lifting cylinder (51). The compensation component (4) is installed on the tool holder (3). On the lifting platform (52), the tool holder (3) has an opening (31) for the compensation component (4) to pass through. The tool holder (3) is movably equipped with a baffle (32) at the opening (31), which can close the opening (31). The lifting cylinder (51) moves the baffle (32) through the lifting linkage (53) to open the opening (31) for the compensation component (4) to pass through, and the compensation component (43) resets and compensates for the offset tool holder. The lifting linkage (53) includes a linkage rope (531) and a linkage rod (532), which is installed on one side of the lifting cylinder (51).The lifting linkage component (53) also includes a linkage guide rod (533), which is rotatably connected to the bottom of the tool holder (3) via a torsion spring. The linkage guide rod (533) is located at the furthest point of the baffle (32) movement. One end of the linkage soft rope (531) is connected to the baffle (32), and the other end passes around the linkage guide rod (533) and the linkage fixed rod (532) in sequence, and is connected to the bottom of the lifting platform (52). The compensation component (43) is equipped with A guide member (44) is provided, comprising a guide block (441) and a guide roller (442). The guide block (441) is mounted on the top of the compensating member (43), and the sidewall of the guide block (441) is alignable with the sidewall of the compensating member (43) near the tool holder. The guide roller (442) is rotatably connected to the top of the guide block (441), and the guide roller (442) is tangent to the sidewall surfaces of the guide block (441) and the compensating member (43) that are aligned.

2. The Swiss-type lathe tool holder offset detection device according to claim 1, characterized in that: The compensation motor (41) has an initial positioning key (411) on its rotating shaft and an initial matching key (421) on its compensation guide plate (42). The compensation guide plate (42) is mounted on the rotating shaft of the compensation motor (41) so that the initial positioning key (411) and the initial matching key (421) are aligned.

3. The Swiss-type lathe tool holder offset detection device according to claim 1, characterized in that: The radius of the guide roller (442) is not less than the preset offset threshold of the tool holder.

4. The Swiss-type lathe tool holder offset detection device according to claim 1, characterized in that: The alarm device (21) is a sound and light lamp or a horn.

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