Hydropower station gate attachment cleaning device
By using a cleaning device consisting of a metal scraper and a base, combined with water flow power to drive the roller brush rotation and mechanical devices, the problems of low efficiency, high risk and environmental pollution in cleaning hydropower station gates have been solved, achieving efficient and automated gate attachment cleaning.
Patent Information
- Application Number
- CN202520279620.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2035-02-21
AI Technical Summary
Existing methods for cleaning hydropower station gates are inefficient, dangerous, and environmentally unfriendly. They are also difficult to cover large gates, high-pressure water cleaning is energy-intensive, and chemical methods pose an ecological pollution risk.
The cleaning device consists of a metal scraper and a base, combined with an auxiliary cleaning mechanism, a guide plate, a comb plate, and a scraper cleaning assembly. It uses water flow power to drive the roller brush to rotate, achieving automated cleaning through mechanical devices. The cleaning effect is ensured by elastic supports and adjusting bolts.
It achieves efficient and automated gate attachment removal, reduces energy consumption, improves cleaning efficiency, ensures thorough cleaning, reduces manual labor intensity, and avoids ecological pollution.
Smart Images

Figure CN223811308U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of hydropower station, specifically, a hydropower station gate attached matter cleaning device. BACKGROUND
[0002] Hydropower station, full name is water power station, is a kind of facility using water energy conversion into electric energy. Hydropower station utilizes the kinetic energy of strong water flow generated by water level difference. When water flow passes through water turbine, its gravitational potential energy and kinetic energy are converted into mechanical energy, to drive generator rotation, finally generates electric energy. Hydropower station gate is an important component in the hydraulic structure of hydropower station, is installed on the aperture of the hydraulic structure of hydropower station, and can be opened and closed movable water retaining structure, it controls the opening and closing of aperture, for controlling water flow, adjusting water level, guaranteeing the safe operation and efficient power generation of hydropower station.
[0003] However, hydropower station gate is in water environment for a long time, and aquatic organisms and sediments are easily attached to the surface of gate plate, which leads to increased opening and closing resistance of gate, decreased sealing performance, and even causes structure corrosion. Current common cleaning methods include manual scraping, high-pressure water jet washing or chemical agent dissolution, but have the following defects:
[0004] 1. Manual cleaning is low in efficiency, high in danger, and difficult to cover large-size gate;
[0005] 2. High-pressure water cleaning is high in energy consumption, can damage anticorrosive coating of gate plate, and the detached attachments can pollute downstream water body;
[0006] 3. Chemical agent method has ecological pollution risk and does not meet environmental protection requirements.
[0007] Therefore, a gate attached matter cleaning device that is efficient, environmentally friendly and can be automatically operated is urgently needed. UTILITY MODEL CONTENTS
[0008] In view of the existing deficiencies, the utility model provides a kind of hydropower station gate attached matter cleaning device, solve the problems raised in the above background art.
[0009] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:
[0010] A kind of hydropower station gate attached matter cleaning device, including metal clean scraping plate and base, the base has two groups and is respectively arranged at the gate of the dam body of hydropower station two sides, the inner side of the base is equipped with metal clean scraping plate, the inner end of the metal clean scraping plate is close to gate plate, the metal clean scraping plate both ends are fixedly connected with the base by installation component, the lower side of the metal clean scraping plate is equipped with auxiliary cleaning mechanism, the bottom of the metal clean scraping plate is fixed with scraping plate cleaning assembly.
[0011] Further, the auxiliary cleaning mechanism comprises a support, a driven pulley, a transmission belt, a driving pulley, an impeller, a support frame and a roller brush, the bottom of the metal cleaning scraper is provided with the roller brush for cleaning the attachments on the gate, the two ends of the roller brush are connected with the metal cleaning scraper through the support, one end of the roller brush is provided with the driven pulley, the inner side of the base is fixedly provided with the support frame corresponding to the driven pulley, the support frame is provided with the impeller, the inner end of the impeller is provided with the driving pulley, and the driving pulley and the driven pulley are transmissionally connected through the transmission belt.
[0012] Further, the bristles of the roller brush are staggered nylon wires and stainless steel wires.
[0013] Further, the bottom of the metal cleaning scraper is provided with the left-high right-low guide inclined plate, and the length of the left end is smaller than that of the left end of the metal cleaning scraper, and the length of the right end is greater than that of the right end of the metal cleaning scraper, and the guide inclined plate is fixedly connected with the support.
[0014] Further, the bottom of the guide inclined plate is provided with the comb plate of the comb structure, the upper end of the comb plate is fixedly connected with the guide inclined plate, and the lower end of the comb plate is clamped into the bristles of the roller brush.
[0015] Further, the installation assembly comprises a connecting plate, a support arm, a fixing seat, a guide rod and a supporting spring, the fixing seat is in a U-shaped structure and is fixedly arranged on the base, a plurality of groups of guide rods are uniformly arranged in the fixing seat in the transverse direction, the support arm is slidably adjusted and is sleeved on the guide rod, the supporting spring is sleeved on the guide rod at the right side of the support arm, and the support arm is fixedly connected with the metal cleaning scraper through the connecting plate and bolts.
[0016] Further, the rear side of the fixing seat is screwed with an adjusting bolt, and the tail end of the adjusting bolt is in abutting connection with the support arm through the fixing seat.
[0017] Further, the scraper cleaning assembly comprises a driving motor, a base, a ball screw, a nut sliding seat and a scraping rod, the base is fixedly installed on the right side of the bottom of the metal cleaning scraper, the ball screw is arranged on the base, one end of the ball screw is provided with the driving motor, the ball screw is screwed with the nut sliding seat, the nut sliding seat is fixedly connected with two groups of L-shaped scraping rods at the left side, and the upper end surfaces of the scraping rods are attached to the bottom surface of the metal cleaning scraper.
[0018] Further, two groups of limiting sliding rails are fixedly arranged on the left and right sides of the base, sliding grooves matched with the limiting sliding rails are formed in the nut sliding seat, and the nut sliding seat is slidably connected with the limiting sliding rails through the sliding grooves.
[0019] Further, limiting switches are installed on the base near the two ends.
[0020] Compared with the prior art, the utility model has the following beneficial effects:
[0021] 1. The utility model discloses an automatic cleaning mode, and the gate adhering matter is realized fast, efficient cleaning through mechanical device, and the automatic cleaning mode can greatly improve the cleaning efficiency, reduce the manual labor intensity, and the device has double cleaning mode, can select suitable cleaning mode according to the kind and thickness of adhering matter, improve the cleaning effect, and ensure that cleaning is thorough.
[0022] 2. The utility model discloses a metal cleaning scraper is set up, is used for scraping the adhering matter on the gate, realizes the cleaning of gate, and the both ends of metal cleaning scraper are fixedly connected with base station through the installation component setting, the firmness of cleaning scraper in the cleaning process is ensured, the auxiliary cleaning mechanism setting is used for assisting the cleaning work of cleaning scraper, improves the cleaning effect, and the scraper cleaning component setting is used for cleaning the adhering matter adhered to the bottom surface of metal cleaning scraper, ensures the cleanliness of cleaning scraper in the continuous cleaning process, guarantees the cleaning effect of follow -up.
[0023] 3. The auxiliary cleaning mechanism in the utility model utilizes water flow power to drive the rotation of the impeller, and then drives the rotation of the roller brush, without the need for an additional power source, reducing energy consumption, the roller brush can preliminarily clean the gate, reducing the difficulty of subsequent cleaning, and improving the effectiveness of cleaning.
[0024] 4. The utility model discloses that the downside of metal cleaning scraper is equipped with the left high right low guide slope, and its left end length is less than the left end length of metal cleaning scraper, and the right end length is greater than the right end length of metal cleaning scraper, and the guide slope is fixedly connected with the support. The guide slope adopts the inclined design of left high right low, and this design can utilize gravity to make the adhering matter cleaned down naturally slide along the slope, avoiding the adhering matter scattering on the roller brush.
[0025] 5. The utility model discloses that the bottom of guide slope is equipped with the comb structure's comb plate, and the upper end of comb plate is fixedly connected with guide slope, and the lower end of comb plate is clamped into the bristle of roller brush. The comb plate of comb structure can effectively comb and separate the adhering matter in the bristle of roller brush, prevent the entanglement or blockage of bristle, keep the cleanliness and smoothness of bristle, and then ensure the normal operation of cleaning work.
[0026] 6. The installation component of the utility model provides certain elastic support force to support arm through the setting of support spring, so that the metal cleaning scraper can maintain certain pressure during the cleaning process, and the cleaning effect and efficiency are improved. At the same time, the support spring can also absorb the impact force in the cleaning process, and protect the metal cleaning scraper from being damaged.
[0027] 7、The utility model discloses a fixing seat rear side is screwed with the adjusting bolt, and the adjusting bolt end penetrates the fixed seat and is connected with the supporting arm. The adjusting bolt provides convenient adjusting means, and the adjusting bolt can directly apply the thrust to the supporting arm, and the position of the supporting arm can be adjusted easily by rotating the adjusting bolt, and then the contact pressure and the spacing of the metal cleaning scraper and the gate surface are changed. BRIEF DESCRIPTION OF DRAWINGS
[0028] Figure 1 It is the whole structure schematic diagram of the utility model.
[0029] Figure 2 It is another angle structure schematic diagram of the utility model.
[0030] Figure 3 It is the front view of the utility model.
[0031] Figure 4 It is the local structure schematic diagram of the utility model.
[0032] Figure 5 It is the local structure left view of the utility model.
[0033] Figure 6 It is the structure schematic diagram of the installation assembly in the utility model.
[0034] Figure 7 It is the bottom structure schematic diagram of the metal cleaning scraper in the utility model.
[0035] Figure 8 It is the use state schematic diagram of the utility model.
[0036] In the drawing: 1, metal cleaning scraper, 2, installation assembly, 21, connecting plate, 22, supporting arm, 23, fixed seat, 24, guide rod, 25, supporting spring, 26, adjusting bolt, 3, base, 4, auxiliary cleaning mechanism, 41, support, 42, driven pulley, 43, transmission belt, 44, driving pulley, 45, impeller, 46, support frame, 47, roller brush, 5, material guide inclined plate, 6, scraper cleaning assembly, 61, driving motor, 62, base, 63, ball screw, 64, nut slide, 65, limit sliding rail, 66, scraping rod, 7, comb plate. DETAILED DESCRIPTION
[0037] The technical scheme in the embodiments of the utility model will be described clearly and completely in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.
[0038] Example:
[0039] like Figures 1 to 8 As shown, a device for cleaning attachments on a hydropower station gate includes a metal scraper 1 and a base 3. Two sets of base 3 are respectively located on both sides of the gate of the hydropower station dam, providing stable support for the metal scraper 1. The metal scraper 1 is installed on the inner side of the base 3 to scrape off the attachments on the gate plate, thus cleaning the gate plate. The inner end of the metal scraper 1 is close to the gate plate. Both ends of the metal scraper 1 are fixedly connected to the base 3 via mounting components 2. The mounting components 2 securely connect both ends of the metal scraper 1 to the base 3, ensuring the stability of the scraper during the cleaning process. An auxiliary... The auxiliary cleaning mechanism 4 is used to assist the cleaning scraper in cleaning work and improve the cleaning effect. The scraper cleaning component 6 is fixed at the bottom of the metal scraper 1 to clean the attachments adhering to the bottom surface of the metal scraper 1, ensuring the cleanliness of the scraper during continuous cleaning and guaranteeing the subsequent cleaning effect. This design solves the problems of low efficiency, high danger and difficulty in covering large-size gates by manual cleaning of attachments in existing hydropower station gates, high energy consumption of high-pressure water cleaning, easy damage to the anti-corrosion coating of the gate plate, and pollution of downstream water bodies by the peeled attachments. Chemical methods pose ecological pollution risks and do not meet environmental protection requirements.
[0040] In this embodiment, the auxiliary cleaning mechanism 4 includes a bracket 41, a driven pulley 42, a transmission belt 43, a driving pulley 44, an impeller 45, a support frame 46, and a roller brush 47. The bottom of the metal scraper 1 is provided with roller brushes 47 for cleaning the deposits on the gate. The roller brushes 47 are used to assist the scraper in cleaning, ensuring the thoroughness and effectiveness of the cleaning. The two ends of the roller brushes 47 are connected to the metal scraper 1 through the bracket 41, ensuring the stability and firmness of the roller brushes 47 during the cleaning process. One end of the roller brushes 47 is equipped with a driven pulley 42. The support frame 46 is fixed inside the base 3 corresponding to the driven pulley 42. The impeller 45 is equipped on the support frame 46. The inner end of the impeller 45 is equipped with a driving pulley 44. The driving pulley 44 and the driven pulley 42 are connected by a transmission belt 43. The impeller 45 is designed to be driven by water flow, thereby driving the driving pulley 44 to rotate, and then driving the roller brush 47 to rotate through the transmission belt 43. When water flows over the impeller 45, the impeller 45 rotates due to the impact of the water flow. The rotation of the impeller 45 is transmitted to the roller brush 47 through the driving pulley 44, the transmission belt 43, and the driven pulley 42, driving the roller brush 47 to rotate. The rotating bristles of the roller brush 47 contact the gate plate and brush away the deposits on the gate plate. This design utilizes the power of water flow to drive the impeller 45 to rotate, which in turn drives the roller brush 47 to rotate. No additional power source is required, reducing energy consumption. The roller brush 47 can perform preliminary cleaning of the gate, reducing the difficulty of subsequent cleaning and improving the cleaning effectiveness.
[0041] In the embodiment, the bristles of the roller brush 47 are nylon wires and stainless steel wires arranged alternately. The nylon wires have good wear resistance and elasticity, can adapt to the gate plate of different hardness and material, and have softness to make close contact with the gate plate during cleaning, effectively brush off the attachments. The nylon wires also have certain corrosion resistance, can maintain long service life in humid or corrosive environment. The stainless steel wires have very high hardness and wear resistance, can handle some stubborn attachments, and can generate greater friction during cleaning to improve the cleaning effect. The alternately arranged nylon wires and stainless steel wires can generate different brushing forces in different directions during rotation of the roller brush 47, so that the attachments on the gate can be more completely removed, and the cleaning efficiency is improved.
[0042] In the embodiment, the metal cleaning scraper 1 is provided with a left-high-right-low material guide inclined plate 5 on the lower side, and the left end length of the material guide inclined plate 5 is less than the left end length of the metal cleaning scraper 1, and the right end length of the material guide inclined plate 5 is greater than the right end length of the metal cleaning scraper 1. The material guide inclined plate 5 is fixedly connected with the support 41. The material guide inclined plate 5 is designed to be left-high-right-low inclined, which can use gravity to make the cleaned attachments naturally slide along the inclined plate, avoiding the attachments from scattering on the roller brush 47.
[0043] In the embodiment, the bottom of the material guide inclined plate 5 is provided with a comb plate 7 with a comb structure. The upper end of the comb plate 7 is fixedly connected with the material guide inclined plate 5, and the lower end of the comb plate 7 is clamped into the bristles of the roller brush 47. The comb plate 7 with the comb structure can effectively comb and separate the attachments in the bristles of the roller brush 47, prevent the bristles from winding or blocking, keep the bristles clean and smooth, and thus ensure the normal operation of the cleaning work.
[0044] In the embodiment, the installation assembly 2 includes a connecting plate 21, a support arm 22, a fixed seat 23, a guide rod 24 and a supporting spring 25. The fixed seat 23 is in U-shaped structure and is fixedly arranged on the base 3. The fixed seat 23 provides a stable support basis, and facilitates the sliding adjustment of the support arm 22 inside the fixed seat 23. A plurality of guide rods 24 are uniformly arranged in the fixed seat 23. The support arm 22 is sleeved on the guide rods 24 and can be adjusted. The supporting spring 25 is sleeved on the guide rod 24 on the right side of the support arm 22. The supporting spring 25 provides a certain elastic support force to the support arm 22, so that the metal cleaning scraper 1 can maintain a certain pressure during cleaning, and the cleaning effect and efficiency are improved. At the same time, the supporting spring 25 can also absorb the impact force during cleaning, protecting the metal cleaning scraper 1 from being damaged. The support arm 22 is fixedly connected with the metal cleaning scraper 1 through the connecting plate 21 and bolts.
[0045] In this embodiment, the fixed seat 23 rear side is screwed with an adjusting bolt 26, the adjusting bolt 26 end penetrates the fixed seat 23 and is connected with the supporting arm 22. The adjusting bolt 26 provides a convenient adjusting means, the adjusting bolt 26 can directly apply a pushing force to the supporting arm 22, and the position of the supporting arm 22 can be easily adjusted by rotating the adjusting bolt 26, thereby changing the contact pressure and distance between the metal cleaning scraper 1 and the gate surface.
[0046] In this embodiment, the scraper cleaning assembly 6 includes a driving motor 61, a base 62, a ball screw 63, a nut sliding seat 64, and a scraper rod 66. The base 62 is fixedly installed on the right side of the bottom of the metal cleaning scraper 1. The base 62 is provided with a ball screw 63, one end of the ball screw 63 is equipped with a driving motor 61, the ball screw 63 is screwed with a nut sliding seat 64, the nut sliding seat 64 is fixedly connected with two groups of L-shaped structure scraper rods 66 on the left side, and the upper end surface of the scraper rod 66 is attached to the bottom surface of the metal cleaning scraper 1. The scraper cleaning assembly 6 is used to clean the adhering substances adhered to the bottom surface of the metal cleaning scraper 1, ensuring the cleanliness of the cleaning scraper during continuous cleaning process and ensuring the subsequent cleaning effect. The driving motor 61 drives the ball screw 63 to rotate, which can drive the nut sliding seat 64 to move, and then drive the scraper rod 66 to move along the bottom surface of the metal cleaning scraper 1, thereby cleaning the adhering substances adhered to the bottom surface of the metal cleaning scraper 1.
[0047] In this embodiment, two groups of limiting sliding rails 65 are fixedly arranged on the left and right sides of the base 62, and a sliding groove matched with the limiting sliding rails 65 is formed in the nut sliding seat 64. The nut sliding seat 64 is slidably connected with the limiting sliding rails 65 through the sliding groove. The limiting sliding rails 65 and the sliding groove limit the movement of the nut sliding seat 64, ensuring the stability of the movement of the nut sliding seat 64 and preventing the nut sliding seat 64 from deviating or shaking during the movement.
[0048] In this embodiment, limiting switches are installed on the base 62 near the two ends. The limiting switch is a switch that switches the circuit according to the travel position of the moving part. When the moving part reaches the predetermined position, the contact of the limiting switch will be triggered, thereby changing the state of the circuit to control the mechanical equipment. The limiting switches installed on the base 62 can accurately control the movement range of the nut sliding seat 64 on the base 62, ensuring that it does not exceed the predetermined area. When the limiting switch is triggered, the driving motor 61 can be controlled to rotate in the opposite direction, so that the nut sliding seat 64 drives the scraper rod 66 to move in the opposite direction, thereby achieving the reciprocating motion control of the scraper rod 66 and continuously cleaning the metal cleaning scraper 1.
[0049] The working principle of the water power station gate adhering substance cleaning device is as follows:
[0050] The base 3 is fixed on both sides of the gate of the dam of the hydropower station, the metal scraping plate 1 and the auxiliary cleaning mechanism 4 are installed, the adjusting bolt 26 in the installation assembly 2 is adjusted, the metal scraping plate 1 is kept in proper contact pressure and spacing with the surface of the gate, the working state of the scraping plate cleaning assembly 6 is checked, and it is ensured that the components such as the driving motor 61, the ball screw 63 and the scraping rod 66 are normally operated. When the gate is lifted for drainage, the impeller 45 is rotated under the impact of the water flow, the drum brush 47 is driven to rotate for preliminary cleaning, the attachments on the surface of the gate are cleaned, the attachments on the gate are scraped by the metal scraping plate 1, deep cleaning is realized, and the bottom surface of the metal scraping plate 1 is kept clean.
[0051] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, on the basis of the above description, other different forms of changes or changes can be made, and all the embodiments cannot be exhausted here, and any obvious changes or changes derived from the technical scheme of the utility model still fall within the protection scope of the utility model.
Claims
1. A device for cleaning deposits on a hydropower station gate, comprising a metal scraper (1) and a base (3), characterized in that: The base (3) has two sets and is respectively located on both sides of the gate of the hydropower station dam. The base (3) is provided with a metal scraper (1) on its inner side. The inner end of the metal scraper (1) is close to the gate plate. The two ends of the metal scraper (1) are fixedly connected to the base (3) through the installation component (2). The metal scraper (1) is provided with an auxiliary cleaning mechanism (4) on its lower side. The scraper cleaning component (6) is fixedly provided at the bottom of the metal scraper (1).
2. The hydropower station gate attachment cleaning device according to claim 1, characterized in that: The auxiliary cleaning mechanism (4) includes a bracket (41), a driven pulley (42), a transmission belt (43), a driving pulley (44), an impeller (45), a support frame (46), and a roller brush (47). The bottom of the metal scraper (1) is provided with roller brushes (47) for cleaning the deposits on the gate. The two ends of the roller brush (47) are connected to the metal scraper (1) through the bracket (41). One end of the roller brush (47) is equipped with a driven pulley (42). The support frame (46) is fixed inside the base (3) corresponding to the driven pulley (42). The impeller (45) is equipped on the support frame (46). The inner end of the impeller (45) is equipped with a driving pulley (44). The driving pulley (44) and the driven pulley (42) are connected by a transmission belt (43).
3. The hydropower station gate attachment cleaning device according to claim 2, characterized in that: The bristles of the roller brush (47) are made of interlaced nylon and stainless steel wires.
4. The device for cleaning attachments on hydropower station gates according to claim 3, characterized in that: The metal scraper (1) is provided with a guide plate (5) that is higher on the left and lower on the right at intervals. The length of its left end is less than the length of the left end of the metal scraper (1), and the length of its right end is greater than the length of the right end of the metal scraper (1). The guide plate (5) is fixedly connected to the bracket (41).
5. The hydropower station gate attachment cleaning device according to claim 4, characterized in that: The bottom of the guide plate (5) is provided with a comb plate (7) with a comb structure. The upper end of the comb plate (7) is fixedly connected to the guide plate (5), and the lower end of the comb plate (7) is inserted into the bristles of the roller brush (47).
6. The device for cleaning attachments on hydropower station gates according to claim 1, characterized in that: The installation assembly (2) includes a connecting plate (21), a support arm (22), a fixed seat (23), a guide rod (24), and a support spring (25). The fixed seat (23) is a U-shaped structure and is fixed on the base (3). Multiple sets of guide rods (24) are evenly arranged horizontally inside the fixed seat (23). A slidable and adjustable support arm (22) is sleeved on the guide rod (24). A support spring (25) is sleeved on the guide rod (24) on the right side of the support arm (22). The support arm (22) is fixedly connected to the metal scraper plate (1) by the connecting plate (21) and bolts.
7. The hydropower station gate attachment cleaning device according to claim 6, characterized in that: An adjusting bolt (26) is screwed to the rear side of the fixed seat (23), and the end of the adjusting bolt (26) passes through the fixed seat (23) and abuts against the support arm (22).
8. The device for cleaning attachments on hydropower station gates according to claim 1, characterized in that: The scraper cleaning assembly (6) includes a drive motor (61), a base (62), a ball screw (63), a nut slide (64), and scraper rods (66). The base (62) is fixedly installed on the bottom right side of the metal scraper (1). The base (62) is provided with a ball screw (63). One end of the ball screw (63) is equipped with a drive motor (61). The nut slide (64) is screwed onto the ball screw (63). Two sets of L-shaped scraper rods (66) are fixedly connected to the left side of the nut slide (64). The upper end face of the scraper rods (66) is in contact with the bottom surface of the metal scraper (1).
9. The device for cleaning attachments on hydropower station gates according to claim 8, characterized in that: Two sets of limiting slide rails (65) are fixed on both the left and right sides of the base (62). The nut slide (64) is provided with a slide groove that matches the limiting slide rail (65). The nut slide (64) is slidably connected to the limiting slide rail (65) through the slide groove.
10. The hydropower station gate attachment cleaning device according to claim 9, characterized in that: Limit switches are installed on both ends of the base (62).