A cleaning track car platform system synchronized with a multi-row daily photovoltaic system

Abstract

The present application relates to the technical field of dynamic photovoltaic panel cleaning, in particular to a cleaning track vehicle platform system synchronized with a multi-row daily photovoltaic system, comprising a track frame, a rotatable platform, a braking mechanism and at least two sets of resistance guide mechanisms; the track frame comprises driven wheels and drive wheels distributed at the front and rear ends, and a control assembly is arranged on the drive wheels to control the rotation thereof; the driven wheels and the drive wheels are placed on a track, the track is laid on the same side of the multi-row parallel photovoltaic panels, and the track frame is guided to move to a certain row of photovoltaic panels; the beneficial effects of the present application are that the resistance guide mechanism is mechanically matched with the photovoltaic panel frame guide rail, the hinge design of the rotatable platform is combined, the real-time synchronization of the rotatable platform and the inclination angles of each row of photovoltaic panels is realized by using the mechanical lever principle, and the docking problem of the cleaning robot caused by the dynamic changes of the photovoltaic panels under the daily system and the inconsistent angles of each row is perfectly solved.

Description

Technical Field

[0001] This invention relates to the field of dynamic photovoltaic panel cleaning technology, specifically a cleaning railcar platform system that is synchronized with a multi-row daily photovoltaic system. Background Technology

[0002] Dust and dirt on the surface of photovoltaic panels can significantly reduce photoelectric conversion efficiency. Therefore, regular cleaning is a key step in ensuring the stable and efficient operation of photovoltaic power generation systems. To further improve the power generation efficiency of photovoltaic panels, solar tracking systems are widely used in photovoltaic power generation projects. This system can drive the photovoltaic panels to adjust their angle in real time according to the changing position of sunlight, maximizing the capture of solar energy and greatly improving power generation efficiency.

[0003] However, the application of the sun-tracking system also brings severe challenges to the automatic cleaning of photovoltaic panels. On the one hand, the sun-tracking system drives the photovoltaic panels to continuously adjust their posture as the sun rises and sets, and the entire photovoltaic power generation system is always in a dynamic process, breaking the stable working environment on which traditional fixed photovoltaic panel cleaning depends. On the other hand, because the drive motor of the sun-tracking system is difficult to achieve absolutely precise synchronous control, there will be slight but critical differences in the tilt angle of each row of photovoltaic panels in the same array, resulting in inconsistent working surface postures of each row of photovoltaic panels.

[0004] These two major problems directly lead to the incompatibility of existing cleaning technologies: Currently available multi-row photovoltaic (PV) cleaning robots are primarily designed for multi-row PV panels with fixed angles, relying on fixed tracks or preset paths to complete cleaning tasks. They cannot handle the dynamic changes in PV panels and the inconsistent angles of each row in a solar photovoltaic system, making it difficult to achieve robot docking and effective cleaning. Therefore, for multi-row solar photovoltaic systems, there is an urgent need for a technical solution that can synchronously adapt to changes in PV panel angles and solve the automatic cleaning problem to ensure the long-term efficient operation of the solar photovoltaic system. Summary of the Invention

[0005] The purpose of this invention is to provide a cleaning railcar platform system that is synchronized with a multi-row solar photovoltaic system, in order to solve the problem mentioned in the background art that it is difficult to achieve docking and effective cleaning of cleaning robots in the scenario where the photovoltaic panels in the solar system are dynamically changing and the angles of each row are inconsistent.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a clean railcar platform system synchronized with a multi-row daily photovoltaic system, comprising: The track frame includes driven wheels and drive wheels distributed at the front and rear ends. A control component is installed on the drive wheel to control its rotation. The driven wheels and drive wheels are supported on the track, which is laid on the same side of multiple rows of parallel photovoltaic panels, guiding the track frame to move to a certain row of photovoltaic panels. A rotating platform is hinged to the top of the track frame, and a cleaning robot is placed on top of the rotating platform; At least two sets of blocking and guiding mechanisms are installed at the front and rear ends below the rotatable platform, and the extended ends of the two sets of blocking and guiding mechanisms contact the corresponding row of photovoltaic panel frames one after another, controlling the rotatable platform and the row of photovoltaic panels to have the same tilt angle, and then the cleaning robot moves between the rotatable platform and the photovoltaic panels. The braking mechanism, mounted on the track frame, is used to brake the rotatable platform to maintain it at a certain tilt angle.

[0007] Preferably, the track frame also includes a base frame arranged along the track laying direction, with driven wheels and drive wheels respectively installed at both ends of the base frame, and the control components are also fixedly connected to the base frame.

[0008] Preferably, the control component includes a housing and a motor installed inside the housing. Both the power output shaft of the motor and the rotation shaft of the drive wheel are fitted with sprockets, and the two sprockets are connected by a chain.

[0009] Preferably, the track frame also includes a tripod, which is fixedly mounted on the base frame; the rotatable platform includes a support frame and a support plate mounted on the support frame, with the middle part of the support frame hinged to the top of the tripod.

[0010] Preferably, a stopper adapted to the cleaning robot is provided above the support plate, and the stopper is located on the same side of the support plate; a notch is provided on the edge of the support plate.

[0011] Preferably, a photovoltaic charging panel is provided above the support plate; a control module and a power supply module are provided inside the housing of the control component, and the photovoltaic charging panel is electrically connected to the control component.

[0012] Preferably, a brake arc plate with an arc structure is fixedly provided on the lower edge of the support frame, and the bottom of the brake arc plate is adjacent to the bottom frame; the braking mechanism is installed on the bottom frame, and the braking mechanism can squeeze the bottom of the brake arc plate.

[0013] Preferably, the braking mechanism includes a horizontal tube, a first telescopic cylinder mounted on the horizontal tube, and a stop plate. A pressing plate is fixedly provided at the telescopic end of the first telescopic cylinder. The pressing plate and the stop plate are directly opposite each other and separated. The bottom of the braking arc plate passes through the gap formed by the pressing plate and the stop plate.

[0014] Preferably, the horizontal tube is fixed on the bottom frame, and a shield is provided on the horizontal tube. The end of the shield near the baffle is set as an opening, and the extrusion plate moves through the opening.

[0015] Preferably, the blocking guide mechanism includes a fixed tube, a second telescopic cylinder installed below the fixed tube, and a contact rod installed at the telescopic end of the second telescopic cylinder; the fixed tube is fixedly connected to the support frame, a guide tube is fixedly installed below the fixed tube, the contact rod slides through the guide tube and is positioned directly opposite the notch; a housing is provided below the fixed tube to shield the second telescopic cylinder.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By mechanically engaging the anti-blocking guide mechanism with the photovoltaic panel frame guide rail, and combining the hinged design of the rotatable platform, the rotatable platform and the tilt angle of each row of photovoltaic panels are synchronized in real time using the mechanical lever principle. This perfectly solves the problem of docking the cleaning robot caused by the dynamic changes of photovoltaic panels and the inconsistency of the angles of each row under the daily system. The synchronization accuracy can adapt to a wide range of photovoltaic panel tilt angle changes, and its adaptability far exceeds that of traditional fixed cleaning platforms.

[0017] 2. Relying on the coordinated control of the control module, motor and sensor, the system can automatically complete the entire process of track vehicle positioning, angle synchronization, cleaning robot scheduling, multi-row cyclic cleaning and return reset, without the need for manual intervention to adjust the platform angle or transport robot, which greatly improves the cleaning efficiency of multi-row daily photovoltaic systems, and is especially suitable for batch cleaning scenarios of large-scale photovoltaic power plants.

[0018] 3. The braking mechanism securely fixes the rotatable platform by squeezing the braking arc plate. Together with the rubber stop on the support plate, it effectively avoids the risk of platform shaking or robot slippage during the operation of the cleaning robot and the movement of the railcar. Attached Figure Description

[0019] Figure 1 This is a first structural schematic diagram of the entire invention; Figure 2 This is a schematic diagram of the second structure of the present invention as a whole; Figure 3 This is a schematic diagram of the third structure of the entire invention; Figure 4 This is a schematic diagram of the fourth structure of the entire invention; Figure 5 This is a schematic diagram of the track frame structure of the present invention; Figure 6 This is a schematic diagram of the structure of the control component of the present invention; Figure 7 This is a schematic diagram of the structure of the rotatable platform of the present invention; Figure 8 This is a schematic diagram of the braking mechanism and braking arc plate structure of the present invention; Figure 9 This is a schematic diagram of the braking mechanism of the present invention; Figure 10This is a schematic diagram of the structure of the blocking and guiding mechanism of the present invention.

[0020] The components represented by each number in the attached diagram are listed below: 1. Track frame; 11. Tripod; 12. Base frame; 13. Driven wheel; 14. Drive wheel; 15. Control component; 16. Control module; 17. Motor; 18. Chain; 2. Rotatable platform; 21. Support plate; 22. Photovoltaic charging panel; 23. Support frame; 24. Braking arc plate; 25. Notch; 3. Braking mechanism; 31. Horizontal tube; 32. Shielding cover; 33. First telescopic cylinder; 34. Squeezing plate; 35. Baffle plate; 4. Baffle guide mechanism; 41. Fixing tube; 42. Second telescopic cylinder; 43. Contact rod; 44. Guide tube; 45. Outer shell. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention provides a technical solution: such as Figure 1 - Figure 10 shown.

[0023] I. Component Selection and Installation Configuration A track frame assembly The track frame 1 is constructed using stainless steel square tubing and includes a tripod 11 and a base frame 12. The tripod 11 is welded and fixed to the middle of the base frame 12, and a hinged seat is provided at the top for connecting the rotatable platform 2.

[0024] Driven wheels 13 and drive wheels 14 are respectively installed at both ends of the base frame 12. I-beam rails are laid on the same side of the multiple rows of photovoltaic panels, and the driven wheels 13 and drive wheels 14 are supported on the rails. In addition, a control component 15 is also installed on the base frame 12. The rotation shaft of the drive wheels 14 is connected to the motor 17 in the control component 15 through a sprocket and chain 18. The motor 17 is a stepper motor or a servo motor to ensure precise speed adjustment and positioning of the railcar.

[0025] The control module 16 and the lithium battery power supply module are fixedly installed inside the housing of the control component 15. The photovoltaic charging panel 22 above the support plate 21 is electrically connected to the power supply module inside the control component 15 through the charging management module to realize solar-assisted power supply.

[0026] Two rotatable platform components The rotatable platform 2 includes a support frame 23 and a support plate 21. The support frame 23 is welded from stainless steel square tubing, and its middle part is rotatably connected to the hinge seat at the top of the tripod 11 via a pin. A copper sleeve is installed at the hinge to reduce friction. The support plate 21 is a non-slip aluminum plate with multiple rubber abutments welded to its surface to accommodate the parking and positioning of the cleaning robot. A photovoltaic charging plate 22 is installed above the support plate 21. This photovoltaic charging plate 22 is electrically connected to the control component 15 to achieve solar-assisted power supply.

[0027] An arc-shaped braking plate 24 is welded to the lower edge of the support frame 23. The arc corresponds to the rotation angle range of the rotatable platform 2. The bottom of the braking plate 24 is located near the bottom frame 12.

[0028] Three-braking mechanism components The braking mechanism 3 is fixedly installed on the bottom frame 12, corresponding to the position below the braking arc plate 24, and includes a horizontal tube 31, a shield 32, a first telescopic cylinder 33, a pressing plate 34, and a stop plate 35. The horizontal tube 31 is a seamless steel pipe, and the shield 32 is formed by bending sheet metal, with its bottom fixedly connected to the horizontal tube 31, and its open end facing the stop plate 35.

[0029] The first telescopic cylinder 33 uses an electromagnetic push rod, and the telescopic end is fixedly connected to the extrusion plate 34, which is made of wear-resistant rubber with a thickness of 20mm. The baffle plate 35 is made of steel plate with a thickness of 10mm and is positioned opposite the extrusion plate 34 with a gap. The bottom of the braking arc plate 24 is set through this gap, and braking is achieved by the extrusion plate 34 pressing the braking arc plate 24.

[0030] Four-stop guide mechanism components At least two sets of the blocking and guiding mechanism 4 are provided, installed at the front and rear ends below the support frame 23 respectively. Each set includes a fixed pipe 41, a second telescopic cylinder 42, a contact rod 43, a guide pipe 44, and a housing 45. The fixed pipe 41 is welded and fixed to the bottom of the support frame 23. The second telescopic cylinder 42 is also an electromagnetic push rod, and the telescopic end is equipped with a contact rod 43.

[0031] The guide tube 44 is sleeved on the outside of the contact rod 43 and welded to the fixing tube 41 to ensure linear extension and contraction of the contact rod 43, and that the guide tube 44 and the contact rod 43 slide in contact. The outer shell 45 is a plastic cover that encloses the second telescopic cylinder 42 for dust protection. Meanwhile, each row of the photovoltaic panel array has a corresponding guide rail installed on its end frame, parallel to the photovoltaic panels. A notch 25 is provided at the edge of the support plate 21, through which the contact rod 43 can pass and contact the guide rail of the photovoltaic panel.

[0032] In order for the platform to function properly, it is also necessary to equip the control component 15 with corresponding devices based on the existing technology, covering four key aspects: signal detection, execution drive, power supply adaptation, and safety protection.

[0033] Signal detection devices include at least the following: Limit sensors (photoelectric or proximity type): One sensor is installed at each end of the track and at the corresponding track position of each row of photovoltaic panels. These sensors are used to locate the initial position of the track vehicle, the stopping position between rows, and the end limit to prevent collisions due to overtravel.

[0034] Position sensor (Hall effect): Installed on the edge of the support plate 21, it detects whether the cleaning robot has completely stopped or left the platform, triggering subsequent actions such as braking.

[0035] Contact sensor (piezoresistive): Integrated at the end of contact rod 43, it detects the contact status between contact rod 43 and photovoltaic panel guide rail, and provides feedback angle synchronous completion signal.

[0036] Tilt sensor (MEMS type): Installed on the support frame 23 of the rotatable platform 2, it collects the tilt angle of the platform in real time and verifies it with the preset photovoltaic panel angle to ensure synchronization accuracy.

[0037] Encoder (incremental type): Coaxially mounted with the drive wheel 14 or motor 17 shaft, it provides real-time feedback on the track vehicle's moving distance and speed, and works with the control module 16 to achieve closed-loop speed regulation and precise positioning.

[0038] Execution drive devices include at least the following devices: Stepper motor driver: It works in conjunction with control module 16 and motor 17 to convert the pulse signal output by the microcontroller into motor driving force, so as to realize the smooth start and stop and speed adjustment of the railcar and avoid step loss.

[0039] Relay module (solid-state relay): used to control the on / off state of the first telescopic cylinder 33 and the second telescopic cylinder 42, isolate the control module from the high-voltage actuator, and prevent electromagnetic interference.

[0040] Power supply and adapter devices include at least the following: DC-DC power module: Converts the voltage of the lithium battery power module (such as 24V) to multiple compatible voltages (3.3V for the control module, 5V for the sensor, and 12V for the relay) to ensure voltage matching of each device.

[0041] Charging management module (including MPPT controller): Optimizes the solar charging efficiency of photovoltaic panels, prevents overcharging and over-discharging of lithium batteries, and extends the service life of the power supply module.

[0042] Backup power switching module: When solar power is insufficient or the lithium battery fails, it automatically switches to an external backup power source (such as AC power to DC) to ensure uninterrupted system operation.

[0043] Safety and auxiliary devices include at least the following: Surge protection module + EMC filter module: Suppresses electromagnetic interference (EMI) in the environment, protects control modules and sensors from voltage surge damage, and improves the system's anti-interference capability.

[0044] Emergency stop button and fault alarm module: The emergency stop button directly cuts off the power supply to the motor, telescopic cylinder and other actuators; the alarm module (buzzer + LED indicator) is used to indicate faults (such as sensor abnormality, angle asynchrony).

[0045] Storage module (Flash chip): Stores cleaning logs (row number, time, fault records) for easy maintenance and troubleshooting; it also stores the initial angle parameters of each row of photovoltaic panels to improve synchronization response speed.

[0046] II. System Working Process An initial state The railcar stops at the first row of multiple rows of solar photovoltaic panels. It receives signals from limit sensors installed at the end of the rail via the control module 16, achieving precise positioning. At this time, the first telescopic cylinder 33 of the braking mechanism 3 is in a retracted state, the squeezing plate 34 separates from the braking arc plate 24, and the brake is released. The second telescopic cylinder 42 of the two sets of abutment and guide mechanisms 4 extends, and the contact rod 43 contacts and abuts against the guide rail of the first row of photovoltaic panel frames. Through the mechanical lever principle, the tilt angle of the rotatable platform 2 and the first row of photovoltaic panels remains consistent. The cleaning robot is placed on the support plate 21 and is fixed in place by rubber abutments.

[0047] First row cleaning status After the control module 16 issues a cleaning command, the cleaning robot starts and moves from the support plate 21 onto the surface of the first row of photovoltaic panels to perform cleaning operations. After a 10-second delay, the control module 16 controls the first telescopic cylinder 33 to extend, and the squeezing plate 34 to move towards the stop plate 35, squeezing the braking arc plate 24 to achieve braking and fix the tilt angle of the rotatable platform 2. After the cleaning robot completes the cleaning, it returns to the support plate 21 along the original path, triggering the positioning sensor to send a signal; then, the second telescopic cylinder 42 retracts, and the contact rod 43 retracts, preparing for the movement of the railcar.

[0048] The three-track car moved to the second row. After a 5-second delay following the return of the cleaning robot, control module 16 starts motor 17, which drives drive wheel 14 to rotate via sprocket and chain 18, causing the track vehicle to move along the track towards the second row of photovoltaic panels. As the track vehicle approaches the second row, motor 17 decelerates, and the track vehicle moves slowly and uniformly. Simultaneously, the second telescopic cylinder 42 extends, and contact rod 43 approaches the guide rail of the second row of photovoltaic panels. After a 3-second delay, the first telescopic cylinder 33 retracts, the brake is gradually released, and contact rod 43 slides along the guide rail after contacting it, causing the rotatable platform 2 to rotate around the hinge point until the center point of the rotatable platform 2 coincides with the center point of the second row of photovoltaic panels. At this point, contact rod 43 is stably attached to the guide rail, and the tilt angle of the rotatable platform 2 and the second row of photovoltaic panels is synchronized.

[0049] Cleaning operations for rows 4 through n After the track car is positioned in the second row, it repeats the cleaning process of the first row: the cleaning robot drives in to clean, the braking mechanism 3 fixes the platform angle, and the contact rod 43 retracts. After cleaning, the track car moves to the third row, the fourth row... and the nth row in sequence. The synchronous positioning and cleaning actions of each row are consistent with those of the second row. The operation is automatically cyclical through the preset row number parameters of the control module 16.

[0050] 5. Return to the initial state After the track vehicle moves to the last row and completes cleaning, the cleaning robot returns to the support plate 21, triggering the endpoint sensor signal. The control module 16 controls the first telescopic cylinder 33 to extend and brake, the second telescopic cylinder 42 to retract, and the motor 17 to reverse. The track vehicle moves along the track towards the first row, maintaining braking and the contact rod 43 retracted during the movement. After reaching the first row, the track vehicle continues to move forward 1 meter. Then, the second telescopic cylinder 42 extends, and the motor 17 reverses again, causing the track vehicle to slowly return to the initial position of the first row. Simultaneously, the brake is gradually released, and the contact rod 43 contacts and engages with the first row guide rail. The rotatable platform 2 returns to its initial synchronization angle, and the system returns to its initial state, awaiting the next cleaning command.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A clean railcar platform system synchronized with a multi-row daily photovoltaic system, characterized in that, include: The track frame (1) includes driven wheels (13) and drive wheels (14) distributed at the front and rear ends. A control component (15) for controlling the rotation of the drive wheels (14) is provided on the drive wheels (14). The driven wheels (13) and drive wheels (14) are supported on the track, which is laid on the same side of multiple rows of parallel photovoltaic panels, guiding the track frame (1) to move to a certain row of photovoltaic panels. A rotatable platform (2) is hinged to the top of the track frame (1), and a cleaning robot is placed above the rotatable platform (2); At least two sets of blocking guide mechanisms (4) are installed at the front and rear ends below the rotatable platform (2), and the extended ends of the two sets of blocking guide mechanisms (4) contact the corresponding row of photovoltaic panel frames one after another, controlling the rotatable platform (2) and the row of photovoltaic panels to have the same tilt angle, and then the cleaning robot moves between the rotatable platform (2) and the photovoltaic panels. Braking mechanism (3), which is mounted on track frame (1), is used to brake the rotatable platform (2) to stabilize it at a certain tilt angle.

2. The clean railcar platform system synchronized with a multi-row daily photovoltaic system according to claim 1, characterized in that: The track frame (1) also includes a base frame (12) arranged along the track laying direction. The driven wheel (13) and the drive wheel (14) are respectively installed at both ends of the base frame (12), and the control component (15) is also fixedly connected to the base frame (12).

3. A clean railcar platform system synchronized with a multi-row daily photovoltaic system according to claim 2, characterized in that: The control component (15) includes a housing and a motor (17) installed inside the housing. Both the power output shaft of the motor (17) and the rotation shaft of the drive wheel (14) are fitted with sprockets, and the two sprockets are connected by a chain (18).

4. A clean railcar platform system synchronized with a multi-row daily photovoltaic system according to claim 1, characterized in that: The track frame (1) also includes a tripod (11), which is fixedly installed on the base frame (12); the rotatable platform (2) includes a support frame (23) and a support plate (21) installed above the support frame (23), with the middle part of the support frame (23) hinged to the top of the tripod (11).

5. A clean railcar platform system synchronized with a multi-row daily photovoltaic system according to claim 4, characterized in that: A stopper adapted to the cleaning robot is provided above the support plate (21), and the stopper is located on the same side of the support plate (21); a notch (25) is provided on the edge of the support plate (21).

6. A clean railcar platform system synchronized with a multi-row daily photovoltaic system according to claim 4, characterized in that: A photovoltaic charging plate (22) is provided above the support plate (21); a control module (16) and a power supply module are provided inside the housing of the control component (15), and the photovoltaic charging plate (22) is electrically connected to the control component (15).

7. A clean railcar platform system synchronized with a multi-row daily photovoltaic system according to claim 4, characterized in that: An arc-shaped brake plate (24) is fixedly provided on the lower edge of the support frame (23), and the bottom of the brake plate (24) is adjacent to the bottom frame (12); the brake mechanism (3) is installed on the bottom frame (12), and the brake mechanism (3) can squeeze the bottom of the brake plate (24).

8. A clean railcar platform system synchronized with a multi-row daily photovoltaic system according to claim 7, characterized in that: The braking mechanism (3) includes a horizontal tube (31), a first telescopic cylinder (33) mounted on the horizontal tube (31), and a stop plate (35). A pressing plate (34) is fixedly provided at the telescopic end of the first telescopic cylinder (33). The pressing plate (34) and the stop plate (35) are opposite to each other and separated. The bottom of the braking arc plate (24) is provided through the gap formed by the pressing plate (34) and the stop plate (35).

9. A clean railcar platform system synchronized with a multi-row daily photovoltaic system according to claim 8, characterized in that: The horizontal tube (31) is fixed on the bottom frame (12), and a shield (32) is provided on the horizontal tube (31). The shield (32) is set with an opening at one end near the baffle (35), and the extrusion plate (34) moves through the opening.

10. A clean railcar platform system synchronized with a multi-row daily photovoltaic system according to claim 1, characterized in that: The blocking guide mechanism (4) includes a fixed tube (41), a second telescopic cylinder (42) installed below the fixed tube (41), and a contact rod (43) installed at the telescopic end of the second telescopic cylinder (42). The fixed tube (41) is fixedly connected to the support frame (23), and a guide tube (44) is fixedly installed below the fixed tube (41). The contact rod (43) slides through the guide tube (44) and is positioned directly opposite the notch (25). A housing (45) is provided below the fixed tube (41) to shield the second telescopic cylinder (42).

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