High-speed toll station over-limit detection channel height limit detection device

Abstract

The utility model relates to a high-speed toll station over-limit detection channel height limit detection device, and effectively solves the problems that an existing detection device cannot carry out height limit detection on different vehicles, manual operation and calibration are needed, danger is caused to operators, and operation is inconvenient. According to the high-speed toll station over-limit detection channel height limit detection device, through the arrangement of the first moving mechanism, the second moving mechanism, the driving assembly and the infrared correlation detection devices, the two sets of infrared correlation detection devices can conduct height limit detection on different types of vehicles, and passing of the different types of vehicles is facilitated; the first moving mechanism or the second moving mechanism can be driven by the driving assembly to move up and down, the overall height of the two infrared correlation detection devices can be adjusted, meanwhile, it is guaranteed that the infrared correlation detection devices on the two sides correspond to each other, the height limit detection device can be calibrated conveniently and rapidly, manual operation is not needed, and the calibration efficiency is improved. The safety of workers is guaranteed, and vehicles can pass normally.

Description

Technical Field

[0001] The utility model belongs to the technical field of height limit detection devices for high-speed toll stations, and in particular relates to a height limit detection device for an over-limit detection channel of a high-speed toll station. Background Art

[0002] Cars of various sizes and specifications have been developed for different purposes, and sometimes manufacturers even customize them according to individual needs. With the widespread popularity of cars, various problems have also arisen. Among them, in order to prevent large vehicles from damaging the road surface of highways, affecting traffic, and crashing into the top of culverts and tunnels, vehicles need to be restricted in height at highway toll stations.

[0003] Most of the existing height limit devices at highway toll stations are to install corresponding infrared counter-radiation sensors at the height limit on both sides of the detection channel. When a normal vehicle passes, the infrared counter-radiation sensor signals on both sides will not be blocked, proving that the vehicle is not over-height. When an over-height vehicle passes, the infrared counter-radiation sensor signals on both sides are blocked, and the over-height of the vehicle can be detected in time. However, this detection method can only detect vehicles of one height. Due to the differences in vehicle functions and sizes, the height limit ranges of different vehicles are different. The existing detection device cannot perform height limit detection on different vehicles, which is not convenient for use in actual conditions. Moreover, since the height limit detection device needs to be used for a long time, the height of the detection device may deviate due to external natural factors. Therefore, the detection device needs to be calibrated at intervals to ensure the accuracy of the detection. The existing detection device needs to be manually calibrated, especially in the area of ​​highway toll stations, which poses great danger to the operator and is inconvenient to operate, affecting the normal passage of vehicles. Utility Model Content

[0004] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a height limit detection device for an over-limit detection channel at a highway toll station. The height limit detection device for an over-limit detection channel at a highway toll station can perform height limit detection on different types of vehicles respectively, which is convenient for the passage of different types of vehicles. The height limit detection device can be calibrated conveniently and quickly without manual operation, which ensures the safety of the staff and allows the normal passage of vehicles.

[0005] The height limit detection device of the over-limit detection channel of a highway toll station includes a support frame and mounting plates fixedly installed on the top of both sides of the support frame and symmetrically arranged, the middle parts of the two mounting plates close to each other are fixedly connected with a first screw, first limit rods are arranged on both sides of the first screw and the first limit rods are fixedly connected to the inside of the mounting plate, the first screw and the first limit rod are externally connected to a first moving mechanism that can move up and down, a second moving mechanism is arranged on the side of the first moving mechanism away from the mounting plate and an infrared counter-radiation detection device that can move up and down is fixedly installed on the active end of the second moving mechanism, a driving assembly is arranged at the bottom of the side of the first moving mechanism and the driving assembly is transmission-connected to both the first moving mechanism and the second moving mechanism.

[0006] Preferably, the first moving mechanism includes a slider, a moving plate, a block, a screw nut and a first spur gear, the moving plate is fixedly connected to the four corners of the first screw side with sliders and the four sliders are respectively sleeved on the outside of the two first limit rods, the number of the blocks is two and the two blocks are fixedly connected to the bottom end of the middle part of the moving plate close to the first screw side, the screw nut is rotatably connected between the two blocks, the first spur gear is fixedly connected to the middle part of the outer surface of the screw nut, the two blocks are sleeved on the outside of the first screw and the screw nut is connected to the outside of the first screw through threaded transmission.

[0007] Preferably, a through slot is provided at a portion of the bottom of the movable plate corresponding to the first spur gear, and a side of the first spur gear close to the through slot is penetrated inside the through slot.

[0008] Preferably, the top and bottom of the movable plate away from the first screw are fixedly connected to a fixed plate, the second moving mechanism includes a second screw, a second limiting rod and a screw slider, the second limiting rod is fixedly connected between the two fixed plates, the second screw is rotatably connected between the two fixed plates and the bottom is passed through the lower surface of the lower fixed plate, the upper and lower ends of the horizontal center line of the second screw are provided with mutually opposite threads, the number of the screw sliders is two and the two screw sliders are respectively connected to the top and bottom of the second screw through threaded transmission, the two screw sliders are symmetrically arranged with the horizontal center line of the second screw as the symmetry axis and are both vertically slidably connected to the outside of the second limiting rod.

[0009] Preferably, the infrared counter-radiation detection device is an infrared counter-radiation sensor, and the ends of the two screw sliders away from the movable plate are fixedly installed with infrared counter-radiation sensors, and the infrared counter-radiation sensors on the top and bottom of the two mounting plates are symmetrically arranged with the vertical center line of the support frame as the symmetry axis and correspond to each other.

[0010] Preferably, the drive assembly includes a drive motor, a first electromagnetic clutch, a second electromagnetic clutch and a second spur gear, the bottom of the movable plate is fixedly connected to a side plate on which the drive motor can be installed, the drive motor is fixedly installed on the side of the side plate away from the mounting plate and the output end is connected to the first electromagnetic clutch through a spline, the second spur gear is fixedly installed at the top output end of the first electromagnetic clutch and is penetrated in the groove and meshed with the first spur gear, the top output end of the second electromagnetic clutch is fixedly connected to the bottom end of the second lead screw, the bottom output end of the first electromagnetic clutch is externally connected to a belt, and the bottom output end of the first electromagnetic clutch is transmission connected to the bottom output end of the second electromagnetic clutch through a belt.

[0011] Preferably, a protective cover is fixedly connected to the outside of the mounting plate, the protective cover is sleeved on the outside of the first moving mechanism and the second moving mechanism, the infrared counter-radiation detection device is arranged on the outside of the protective cover, and the lead screw slider is passed through the side of the protective cover and slides on its side.

[0012] The above technical solution has the following beneficial effects:

[0013] The height limit detection device for the overload detection channel of the highway toll station is provided with a first moving mechanism, a second moving mechanism, a driving assembly and an infrared counter-radiation detection device. The two groups of infrared counter-radiation detection devices can respectively perform height limit detection on different types of vehicles, so as to facilitate the passage of different types of vehicles, and the first moving mechanism or the second moving mechanism can be driven up and down respectively by the driving assembly. When the infrared counter-radiation detection device needs to be height adjusted, the second moving mechanism can be driven to move first so that the spacing between the upper and lower infrared counter-radiation detection devices can be accurately adjusted, and then the driving assembly can drive the first moving mechanism to move up and down to adjust the overall height of the two infrared counter-radiation detection devices, while ensuring that the infrared counter-radiation detection devices on both sides correspond to each other, so that the height limit detection device can be calibrated conveniently and quickly without manual operation, which not only ensures the safety of the staff but also allows the normal passage of vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0015] Figure 2 This is a schematic diagram of the internal structure of the protective cover of the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the mounting plate of the utility model;

[0017] Figure 4 This is a schematic diagram of the disassembly of the first moving mechanism of the utility model;

[0018] Figure 5 This is a schematic diagram of the disassembly of the second moving mechanism of the utility model;

[0019] Figure 6 This is a schematic diagram of the movable plate of the utility model;

[0020] Figure 7 This is a schematic diagram of the disassembly of the drive assembly of the utility model;

[0021] Figure 8 This is a structural schematic diagram of the second embodiment of the utility model.

[0022] In the figure: 1. support frame; 2. mounting plate; 3. first lead screw; 4. first limit rod; 5. slider; 6. movable plate; 7. block; 8. lead screw nut; 9. first spur gear; 10. fixed plate; 11. second lead screw; 12. second limit rod; 13. lead screw slider; 14. infrared counter-radiation sensor; 15. drive motor; 16. first electromagnetic clutch; 17. second electromagnetic clutch; 18. second spur gear; 19. side plate; 20. belt; 21. protective cover; 22. sleeve; 23. telescopic rod. DETAILED DESCRIPTION

[0023] The above and other technical contents, features and functions of the present invention are described in detail below with reference to the attached Figures 1 to 8 The embodiments are described in detail.

[0024] Embodiment 1: This embodiment provides a high-speed toll station overload detection channel height limit detection device, as shown in the attached Figure 1-7As shown, it includes a support frame 1 and a mounting plate 2 fixedly installed on the top of both sides of the support frame 1 and symmetrically arranged. Alarms are fixedly installed on both sides of the top of the support frame 1. The alarms include warning lights and buzzers. The alarms on both sides correspond to two groups of infrared counter-radiation sensors 14 respectively. Two rings are fixedly connected to one side of the mounting plate 2 close to the support frame 1. The two rings are both sleeved on the outside of the support frame 1 and the open ends are threaded with fixing bolts. The rings are sleeved on the support frame 1 and locked with fixing bolts, so that the mounting plate 2 can be fixed on the support frame 1. The middle parts of the two mounting plates 2 close to each other on one side are fixedly connected with a first lead screw 3. First limit rods 4 are provided on both sides of the first lead screw 3 and the first limit rod 4 is fixedly connected to the inside of the mounting plate 2. The external transmission of the first lead screw 3 and the first limit rod 4 is connected with a first moving mechanism that can move up and down. The first moving mechanism includes a slider 5, a moving plate 6, a block 7, a lead screw nut 8 and a first spur gear 9. The moving plate 6 is close to the first lead screw The four corners of one side of 3 are fixedly connected with sliders 5 and the four sliders 5 are respectively sleeved on the outside of the two first limiting rods 4. There are two clamping blocks 7 and the two clamping blocks 7 are fixedly connected to the bottom end of the moving plate 6 near the middle of one side of the first lead screw 3. The lead screw nut 8 is rotatably connected between the two clamping blocks 7. The first spur gear 9 is fixedly connected to the middle of the outer surface of the lead screw nut 8. The two clamping blocks 7 are sleeved on the outside of the first lead screw 3 and the lead screw nut 8 is connected to the outside of the first lead screw 3 through threaded transmission. The clamping block 7 can slide up and down along the outside of the first lead screw 3. When the lead screw nut 8 rotates, the first lead screw 3 is in a fixed state and the first limiting rods 4 are limited on both sides, so that the moving plate 6 can only move up and down. Therefore, when the lead screw nut 8 rotates, it can move up and down outside the first lead screw 3, thereby driving the overall structure on the moving plate 6 to move up and down along the first lead screw 3. A through groove is opened at the bottom of the moving plate 6 corresponding to the first spur gear 9, and the side of the first spur gear 9 close to the through groove is penetrated inside it;

[0025] The top and bottom of the movable plate 6 away from the first screw 3 are fixedly connected with a fixed plate 10, and the side of the first movable mechanism away from the mounting plate 2 is provided with a second movable mechanism, and the second movable mechanism includes a second screw 11, a second limiting rod 12 and a screw slider 13, and the second limiting rod 12 is fixedly connected between the two fixed plates 10, and the second screw 11 is rotatably connected between the two fixed plates 10 and the bottom is passed through the lower surface of the lower fixed plate 10, and the upper and lower ends of the horizontal midline of the second screw 11 are provided with mutually opposite threads, and the screw There are two sliders 13 and the two screw sliders 13 are respectively connected to the top and bottom of the second screw 11 through threaded transmission. The two screw sliders 13 are symmetrically arranged with the horizontal midline of the second screw 11 as the symmetry axis and are both vertically slidably connected to the outside of the second limit rod 12. The second limit rod 12 limits the screw slider 13 to move up and down along the second screw 11. Therefore, when the second screw 11 rotates, the screw sliders 13 at the top and bottom of the second screw 11 will synchronously approach or move away from each other, and the two will move synchronously relative to each other.

[0026] An infrared counter-beam detection device that can move up and down is fixedly installed on the movable end of the second moving mechanism. The infrared counter-beam detection device is an infrared counter-beam sensor 14. The ends of the two lead screw sliders 13 away from the moving plate 6 are fixedly installed with infrared counter-beam sensors 14. The top and bottom infrared counter-beam sensors 14 on the two mounting plates 2 are symmetrically arranged with the vertical midline of the support frame 1 as the symmetry axis and correspond to each other. The two top corresponding infrared counter-beam sensors 14 on the mounting plates 2 on both sides are a group of detection devices, and the two bottom corresponding infrared counter-beam sensors 14 on the mounting plates 2 on both sides are another group of detection devices. The bottom group of infrared counter-beam sensors 14 can perform height limit detection on vehicles with relatively low height limit standards, and the top group of infrared counter-beam sensors 14 can perform height limit detection on vehicles with relatively high height limit standards;

[0027] A driving assembly is provided at the bottom of the side of the first moving mechanism and the driving assembly is transmission-connected with both the first moving mechanism and the second moving mechanism. The driving assembly includes a driving motor 15, a first electromagnetic clutch 16, a second electromagnetic clutch 17 and a second spur gear 18. A side plate 19 on which the driving motor 15 can be installed is fixedly connected to the bottom of the moving plate 6. The driving motor 15 is fixedly mounted on the side of the side plate 19 away from the mounting plate 2 and the output end is connected to the first electromagnetic clutch 16 through a spline. The second spur gear 18 is fixedly mounted on the top output end of the first electromagnetic clutch 16 and is penetrated in the groove and meshed with the first spur gear 9. The top output end of the second electromagnetic clutch 17 is fixedly connected to the bottom end of the second lead screw 11. The bottom output end of the first electromagnetic clutch 16 is externally transmission-connected with a belt 20. The bottom output end of the first electromagnetic clutch 16 is connected to the second electromagnetic clutch through the belt 20. The bottom output end of the device 17 is connected by transmission. When it is necessary to adjust and calibrate the height of the two groups of infrared counter-radiation sensors 14, the first electromagnetic clutch 16 and the second electromagnetic clutch 17 are first controlled so that the drive motor 15 can only drive the second lead screw 11 to rotate, and then the spacing between the upper and lower infrared counter-radiation sensors 14 is adjusted to the standard spacing, and then the working state of the first electromagnetic clutch 16 and the second electromagnetic clutch 17 is adjusted so that the drive motor 15 can only drive the second spur gear 18 to rotate. When the second spur gear 18 rotates, it can drive the first spur gear 9 and the lead screw nut 8 to rotate, so that the lead screw nut 8 and the overall structure on the movable plate 6 move up and down, and the height of the two groups of infrared counter-radiation sensors 14 is adjusted to the required height limit according to the measurement, and the infrared counter-radiation sensors 14 on both sides of the support frame 1 are adjusted to the corresponding state, thereby completing the calibration of the height limit detection device;

[0028] The infrared counter-radiation sensor 14, the drive motor 15, the first electromagnetic clutch 16, the second electromagnetic clutch 17, the warning light and the buzzer are all existing well-known technologies, so they will not be elaborated here. The alarm, the infrared counter-radiation sensor 14, the drive motor 15, the first electromagnetic clutch 16 and the second electromagnetic clutch 17 are all connected to the external control unit through wires, and the two alarms on both sides of the top of the support frame correspond to the two groups of infrared counter-radiation detection devices respectively. As an extension means of the utility model, the PC in the toll booth corresponding to the detection device can be electrically connected to the control unit of the device through wires, and the detection signals of the two groups of infrared counter-radiation detection devices can be transmitted to the PC in the toll booth through the control unit, and the PC transmits the corresponding signal to the terminal display screen, so that the staff in the toll booth can timely know the information of the vehicle's overheight and take countermeasures;

[0029] When both the bottom and top infrared counter-beam detection devices detect that the vehicle is overheight, it proves that the vehicle must be overheight, and the alarm corresponding to the top infrared counter-beam detection device is controlled to flash and emit a warning sound, and the control unit transmits the detection signal of the top infrared counter-beam detection device to the PC in the toll booth; when the bottom infrared counter-beam detection device detects that the vehicle is overheight and the top infrared counter-beam detection device detects normally, the staff determines whether the vehicle is overheight according to the type of the vehicle. If the type of the vehicle is based on the height limit standard of the top infrared counter-beam detection device, the vehicle is not overheight and can pass normally; if the type of the vehicle is based on the height limit standard of the bottom infrared counter-beam detection device, the vehicle is overheight, and the alarm corresponding to the bottom infrared counter-beam detection device is controlled to flash and emit a warning sound, and the control unit transmits the detection signal of the bottom infrared counter-beam detection device to the PC in the toll booth; when both the top and bottom infrared counter-beam detection devices do not detect that the vehicle is overheight, the vehicle can pass normally;

[0030] The outside of the mounting plate 2 is fixedly connected with a protective cover 21, which is sleeved on the outside of the first moving mechanism and the second moving mechanism. The infrared radiation detection device is arranged on the outside of the protective cover 21, and the lead screw slider 13 is arranged on the side of the protective cover 21 and slides on the side. The protective cover 21 can protect the overall structure inside it and prevent the external dust or rain from affecting the operation of the internal structure.

[0031] Embodiment 2: This embodiment provides another adjustment method for controlling the infrared radiation sensor 14, such as Figure 8 As shown, the driving motor 15 is fixedly installed with the mounting plate 2 as a whole, and the rotation of the first lead screw 3 and the second lead screw 11 is controlled by two electromagnetic clutches. A sleeve 22 and a telescopic rod 23 are arranged between the second lead screw 11 and the second electromagnetic clutch 17 corresponding thereto. The sleeve 22 is fixedly installed at the top output end of the second electromagnetic clutch 17, and the telescopic rod 23 is fixedly connected to the bottom end of the second lead screw 11 and is inserted into the sleeve 22. Both sides of the telescopic rod 23 are provided with protrusions so that it can only move up and down along the inside of the sleeve 22 but not rotate therein. When the movable plate 6 moves up and down, the second lead screw 11 will move between the sleeve 22 and the telescopic rod 23. The second electromagnetic clutch 17 can also be moved up and down, and the sleeve 22 and the telescopic rod 23 can still transmit the rotation of the second electromagnetic clutch 17, thereby ensuring the normal activity of the second lead screw 11; the driving motor 15 only drives the second lead screw 11 to rotate through the first electromagnetic clutch 16 and the second electromagnetic clutch 17, and the first lead screw 3 does not rotate, thereby adjusting the distance between the upper and lower infrared counter-radiation detection devices; the driving motor 15 drives the first lead screw 3 to rotate through the first electromagnetic clutch 16, thereby driving the movable plate 6 to move up and down, thereby adjusting the overall height of the two groups of infrared counter-radiation detection devices. Therefore, both embodiments can achieve the purpose of adjusting and calibrating the height of the infrared counter-radiation detection device.

[0032] In summary, the use steps of the high-speed toll station overload detection channel height limit detection device are as follows:

[0033] 1. Adjust the two sets of infrared sensors 14 at different heights to detect height limits for different types of vehicles;

[0034] 2. When the heights of the two sets of infrared sensors 14 deviate and cause the detection result to be inaccurate, the driving motor 15 is controlled to drive the second lead screw 11 first, so that the distance between the upper and lower infrared sensors 14 is adjusted to the standard distance;

[0035] 3. Then, the driving motor 15 can only drive the lead screw nut 8, and according to the distance measured on the ground, the movable plate 6 moves up and down along the first lead screw 3, and the heights of the two groups of infrared radiation sensors 14 are adjusted to the standard height, thereby completing the calibration of the detection device.

[0036] The above description is only for illustrating the present invention, and it should be understood that the present invention is not limited to the above embodiments, and various variations that conform to the concept of the present invention are within the protection scope of the present invention.

Claims

1. A height limit detection device for an overload detection channel of a high-speed toll station, comprising a support frame (1) and mounting plates (2) fixedly mounted on the top of both sides of the support frame (1) and symmetrically arranged, characterized in that: A first lead screw (3) is fixedly connected to the middle of the side where the two mounting plates (2) are close to each other, a first limit rod (4) is arranged on both sides of the first lead screw (3), and the first limit rod (4) is fixedly connected to the inside of the mounting plate (2), the first lead screw (3) and the first limit rod (4) are externally connected to a first movable mechanism that can move up and down, a second movable mechanism is arranged on the side of the first movable mechanism away from the mounting plate (2), and an infrared counter-radiation detection device that can move up and down is fixedly installed on the movable end of the second movable mechanism, a driving component is arranged at the bottom of the side of the first movable mechanism, and the driving component is transmission-connected to both the first movable mechanism and the second movable mechanism.

2. According to claim 1, a high-speed toll station overload detection channel height limit detection device is characterized in that: The first moving mechanism comprises a slider (5), a moving plate (6), a clamping block (7), a lead screw nut (8) and a first spur gear (9); the sliders (5) are fixedly connected at the four corners of the moving plate (6) close to the first lead screw (3), and the four sliders (5) are respectively sleeved on the outside of two first limit rods (4); the number of the clamping blocks (7) is two, and the two clamping blocks (7) are fixedly connected to the bottom end of the middle part of the moving plate (6) close to the first lead screw (3); the lead screw nut (8) is rotatably connected between the two clamping blocks (7); the first spur gear (9) is fixedly connected to the middle part of the outer surface of the lead screw nut (8); the two clamping blocks (7) are sleeved on the outside of the first lead screw (3), and the lead screw nut (8) is connected to the outside of the first lead screw (3) through threaded transmission.

3. According to claim 2, a high-speed toll station overload detection channel height limit detection device is characterized in that: A through slot is provided at a portion of the bottom of the movable plate (6) corresponding to the first spur gear (9), and a side of the first spur gear (9) close to the through slot is penetrated inside the through slot.

4. According to claim 2, a high-speed toll station overload detection channel height limit detection device is characterized in that: The top and bottom of the movable plate (6) away from the first screw (3) are fixedly connected to a fixed plate (10); the second movable mechanism comprises a second screw (11), a second limiting rod (12) and a screw slider (13); the second limiting rod (12) is fixedly connected between the two fixed plates (10); the second screw (11) is rotatably connected between the two fixed plates (10) and the bottom is passed through the lower surface of the lower fixed plate (10); the upper and lower ends of the horizontal center line of the second screw (11) are provided with mutually opposite threads; the number of the screw slider (13) is two and the two screw sliders (13) are respectively connected to the top and bottom of the second screw (11) through threaded transmission; the two screw sliders (13) are symmetrically arranged with the horizontal center line of the second screw (11) as the symmetry axis and are both vertically slidably connected to the outside of the second limiting rod (12).

5. According to claim 4, a high-speed toll station overload detection channel height limit detection device is characterized in that: The infrared counter-radiation detection device is an infrared counter-radiation sensor (14), and the ends of the two lead screw sliders (13) away from the movable plate (6) are fixedly mounted with an infrared counter-radiation sensor (14), and the infrared counter-radiation sensors (14) at the top and bottom of the two mounting plates (2) are symmetrically arranged with the vertical center line of the support frame (1) as the symmetry axis and correspond to each other.

6. The device for detecting the height limit of an overload detection channel at a high-speed toll station according to claim 4, characterized in that: The driving assembly comprises a driving motor (15), a first electromagnetic clutch (16), a second electromagnetic clutch (17) and a second spur gear (18); the bottom of the movable plate (6) is fixedly connected to a side plate (19) on which the driving motor (15) can be installed; the driving motor (15) is fixedly installed on a side of the side plate (19) away from the mounting plate (2) and the output end is connected to the first electromagnetic clutch (16) through a spline; the second spur gear (18) is fixedly installed at the top output end of the first electromagnetic clutch (16) and is inserted into the groove and meshes with the first spur gear (9); the top output end of the second electromagnetic clutch (17) is fixedly connected to the bottom end of the second lead screw (11); the bottom output end of the first electromagnetic clutch (16) is externally connected to a belt (20); the bottom output end of the first electromagnetic clutch (16) is connected to the bottom output end of the second electromagnetic clutch (17) through the belt (20).

7. The device for detecting height limit of an over-limit detection channel at a high-speed toll station according to claim 4 is characterized in that: A protective cover (21) is fixedly connected to the outside of the mounting plate (2), the protective cover (21) is sleeved on the outside of the first moving mechanism and the second moving mechanism, the infrared counter-radiation detection device is arranged on the outside of the protective cover (21), and the lead screw slider (13) is inserted into the side of the protective cover (21) and slides on the side thereof.

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